General Description
The MAX6126 is an ultra-low-noise, high-precision, low-
dropout voltage reference. This family of voltage references
feature curvature-correction circuitry and high-stability,
laser-trimmed, thin-film resistors that result in 3ppm/°C
(max) temperature coefficients and an excellent ±0.02%
(max) initial accuracy. The proprietary low-noise reference
architecture produces a low flicker noise of 1.3μV
P-P
and
wideband noise as low as 60nV/√Hz (2.048V output) without
the increased supply current usually found in low-noise
references. Improve wideband noise to 35nV/√Hz and AC
power-supply rejection by adding a 0.1μF capacitor at the
noise reduction pin. The MAX6126 series mode reference
operates from a wide 2.7V to 12.6V supply voltage range
and load-regulation specifications are guaranteed to be
less than 0.025Ω for sink and source currents up to 10mA.
These devices are available over the automotive temperature
range of -40°C to +125°C.
The MAX6126 typically draws 380μA of supply current
and is available in 2.048V, 2.500V, 2.800V, 3.000V,
3.300V, 3.600V, 4.096V, and 5.000V output voltages. The
MAX6126 also feature dropout voltages as low as 200mV.
Unlike conventional shunt-mode (two-terminal) references
that waste supply current and require an external resistor,
the MAX6126 offers supply current that is virtually independent
of supply voltage and does not require an external resistor.
The MAX6126 is stable with 0.1μF to 10μF of load capacitance.
The MAX6126 is available in the tiny 8-pin μMAX®, as well
as 8-pin SO packages
.
Applications
●High-Resolution A/D and D/A Converters
●ATE Equipment
●High-Accuracy Reference Standard
●Precision Current Sources
● Digital Voltmeters
●High-Accuracy Industrial and Process Control
Benets and Features
● Ultra-Low 1.3μVP-P Noise (0.1Hz to 10Hz, 2.048V
Output)
●Ultra-Low 3ppm/°C (max) Temperature Coefficient
●±0.02% (max) Initial Accuracy
● Wide (VOUT + 200mV) to 12.6V Supply Voltage
Range
● Low 200mV (max) Dropout Voltage
● 380μA Quiescent Supply Current
●10mA Sink/Source-Current Capability
●Stable with CLOAD = 0.1μF to 10μF
●Low 20ppm/1000hr Long-Term Stability
● 0.025Ω (max) Load Regulation
● 20μV/V (max) Line Regulation
● Force and Sense Outputs for Remote Sensing
Ordering Information continued at end of data sheet.
19-2647; Rev 8; 6/16
+Denotes a lead(Pb)-free/RoHS-compliant package.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
PART TEMP RANGE PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAXIMUM INITIAL
ACCURACY (%)
MAXIMUM TEMPCO
(-40°C to +85°C)
(ppm/°C)
MAX6126AASA21+ -40°C to +125°C 8 SO 2.048 0.02 3
MAX6126BASA21+ -40°C to +125°C 8 SO 2.048 0.06 5
MAX6126A21+ -40°C to +125°C 8 µMAX 2.048 0.06 3
OUTS
I.C.*GNDS
1
2
8
7
I.C.*
OUTFIN
GND
NR
SO/µMAX
TOP VIEW
3
4
6
5
MAX6126
*I.C. = INTERNALLY CONNECTED. DO NOT USE.
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Pin Conguration
Ordering Information
(All voltages referenced to GND)
GNDS ...................................................................-0.3V to +0.3V
IN ........................................................................... -0.3V to +13V
OUTF, OUTS, NR ...... -0.3V to the lesser of (VIN + 0.3V) or +6V
Output Short Circuit to GND or IN......................................... 60s
Continuous Power Dissipation (TA = +70°C)
8-Pin μMAX (derate 4.5mW/°C above +70°C) ............362mW
8-Pin SO (derate 5.88mW/°C above +70°C) ............... 471mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) ....................................... +260°C
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 2.048 V
Output Voltage Accuracy Referred to
VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C
to +85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C
to +125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation DVOUT/
DVIN
2.7V ≤ VIN ≤
12.6V
TA = +25°C 2 20 µV/V
TA = -40°C to +125°C 40
Load Regulation DVOUT/
DIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 0.7 25 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 1.3 25
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle
SO 25 ppm
µMAX 80
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics—MAX6126_21 (VOUT = 2.048V)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 1.3 µVP-P
f = 1kHz, CNR = 0 60 nV/√Hz
f = 1kHz, CNR = 0.1µF 35
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 0.8 ms
CNR = 0.1µF 20
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 2.7 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 2.500 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to
+85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation DVOUT/
DVIN 2.7V ≤ VIN ≤ 12.6V TA = +25°C 3 20 µV/V
TA = -40°C to +125°C 40
Load Regulation DVOUT/
DIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 1 25 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 1.8 25
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_25 (VOUT = 2.500V)
Electrical Characteristics—MAX6126_21 (VOUT = 2.048V) (continued)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Dropout Voltage (Note 3) VIN - VOUT DVOUT = 0.1% IOUT = 5mA 0.06 0.2 V
IOUT = 10mA 0.12 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle
SO 35 ppm
µMAX 80
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 1.45 µVP-P
f = 1kHz, CNR = 0 75 nV/√Hz
f = 1kHz, CNR = 0.1µF 45
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 1 ms
CNR = 0.1µF 20
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 2.7 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 2.800 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade µMAX -0.06 +0.06 %
B grade µMAX -0.10 +0.10
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to
+85°C
A grade µMAX 1 3
ppm/°C
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation DVOUT/
DVIN 3.0V ≤ VIN ≤ 12.6V TA = +25°C 3.5 23 µV/V
TA = -40°C to +125°C 45
Load Regulation DVOUT/
DVIN
Sourcing: 0 ≤ IOUT ≤ 10mA 1.3 28 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 2.4 28
Dropout Voltage (Note 3) VIN - VOUT DVOUT = 0.1% IOUT = 5mA 0.06 0.2 V
IOUT = 10mA 0.12 0.4
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_25 (VOUT = 2.500V) (continued)
Electrical Characteristics—MAX6126_28 (VOUT = 2.800V)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle µMAX 80 ppm
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C µMAX 100 ppm/
1000hr
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 1.45 µVP-P
f = 1kHz, CNR = 0 75 nV/√Hz
f = 1kHz, CNR = 0.1µF 45
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 1 ms
CNR = 0.1µF 20
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 3.0 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 3.000 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to
+85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_30 (VOUT = 3.000V)
Electrical Characteristics—MAX6126_28 (VOUT = 2.800V) (continued)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Line Regulation DVOUT/
DVIN 3.2V ≤ VIN ≤ 12.6V TA = +25°C 4 25 µV/V
TA = -40°C to +125°C 50
Load Regulation DVOUT/
DIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 1.5 30 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 2.8 30
Dropout Voltage (Note 3) VIN - VOUT DVOUT = 0.1% IOUT = 5mA 0.06 0.2 V
IOUT = 10mA 0.11 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle
SO 20 ppm
µMAX 80
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 1.75 µVP-P
f = 1kHz, CNR = 0 90 nV/√Hz
f = 1kHz, CNR = 0.1µF 55
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 1.2 ms
CNR = 0.1µF 20
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 3.2 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_30 (VOUT = 3.000V) (continued)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 3.300 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to
+85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation ΔVOUT/
ΔVIN 3.5V ≤ VIN ≤ 12.6V TA = +25°C 11 35 µV/V
TA = -40°C to +125°C 70
Load Regulation ΔVOUT/
ΔIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 2 40 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 5 40
Dropout Voltage (Note 3) VIN - VOUT ΔVOUT = 0.1% IOUT = 5mA 0.06 0.2 V
IOUT = 10mA 0.12 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) ΔVOUT/
cycle
SO 20 ppm
µMAX 80
Long-Term Stability ΔVOUT/
time
1000hr at
TA = +25°C
SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 1.95 µVP-P
f = 1kHz, CNR = 0 100 nV/√Hz
f = 1kHz, CNR = 0.1µF 60
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
Turn-On Settling Time tRTo VOUT = 0.01%
of nal value
CNR = 0 1.2 ms
CNR = 0.1µF 20
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 3.5 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
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Series Voltage Reference
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Electrical Characteristics—MAX6126_33 (VOUT = 3.300V)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 3.6 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to +85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation ΔVOUT/
ΔVIN 3.8V ≤ VIN ≤ 12.6V TA = +25°C 12 40 µV/V
TA = -40°C to +125°C 80
Load Regulation ΔVOUT/
ΔIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 2 50 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 6 50
Dropout Voltage (Note 3) VIN - VOUT ΔVOUT = 0.1% IOUT = 5mA 0.05 0.2 V
IOUT = 10mA 0.11 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) ΔVOUT/
cycle
SO 20 ppm
µMAX 80
Long-Term Stability ΔVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 2.1 µVP-P
f = 1kHz, CNR = 0 110 nV/√Hz
f = 1kHz, CNR = 0.1µF 66
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 1.6 ms
CNR = 0.1µF 20
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 3.8 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
Electrical Characteristics—MAX6126_36 (VOUT = 3.600V)
(VIN = 5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 4.096 V
Output Voltage Accuracy Referred to VOUT,
TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to
+85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation DVOUT/
DVIN 4.3V ≤ VIN ≤ 12.6V TA = +25°C 4.5 30 µV/V
TA = -40°C to +125°C 60
Load Regulation DVOUT/
DIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 2 40 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 5 40
Dropout Voltage (Note 3) VIN - VOUT DVOUT = 0.1% IOUT = 5mA 0.05 0.2 V
IOUT = 10mA 0.1 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle
SO 20 ppm
µMAX 80
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 2.4 µVP-P
f = 1kHz, CNR = 0 120 nV/√Hz
f = 1kHz, CNR = 0.1µF 80
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 1.6 ms
CNR = 0.1µF 20
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 4.3 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_41 (VOUT = 4.096V)
(VIN = 5.5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUTPUT
Output Voltage VOUT TA = +25°C 5.000 V
Output Voltage Accuracy TA = +25°C
A grade SO -0.02 +0.02
%
B grade SO -0.06 +0.06
A grade µMAX -0.06 +0.06
B grade µMAX -0.1 +0.1
Output Voltage Temperature
Coefcient (Note 1) TCVOUT
TA = -40°C to +85°C
A grade SO 0.5 3
ppm/°C
B grade SO 1 5
A grade µMAX 1 3
B grade µMAX 2 7
TA = -40°C to
+125°C
A grade SO 1 5
B grade SO 2 10
A grade µMAX 2 5
B grade µMAX 3 12
Line Regulation DVOUT/
DVIN 5.2V ≤ VIN ≤ 12.6V TA = +25°C 3 40 µV/V
TA = -40°C to +125°C 80
Load Regulation DVOUT/
DIOUT
Sourcing: 0 ≤ IOUT ≤ 10mA 2.5 50 µV/mA
Sinking: -10mA ≤ IOUT ≤ 0 6.5 50
Dropout Voltage (Note 3) VIN - VOUT DVOUT = 0.1% IOUT = 5mA 0.05 0.2 V
IOUT = 10mA 0.1 0.4
OUT Short-Circuit Current ISC
Short to GND 160 mA
Short to IN 20
Thermal Hysteresis (Note 2) DVOUT/
cycle
SO 15 ppm
µMAX 80
Long-Term Stability DVOUT/
time 1000hr at TA = +25°C SO 20 ppm/
1000hr
µMAX 100
DYNAMIC CHARACTERISTICS
Noise Voltage eOUT
f = 0.1Hz to 10Hz 2.85 µVP-P
f = 1kHz, CNR = 0 145 nV/√Hz
f = 1kHz, CNR = 0.1µF 95
Capacitive-Load Stability Range CLOAD No sustained oscillations 0.1 to 10 µF
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_50 (VOUT = 5.000V)
(VIN = 5.5V, CLOAD = 0.1μF, IOUT = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
(VIN = 5V for MAX6126_21/25/30/33/36/41, VIN = 5.5V for MAX6126_50, CLOAD = 0.1μF, IOUT = 0, TA = +25°C, unless otherwise
specied.) (Note 5)
Note 1: Temperature coefficient is measured by the “box” method, i.e., the maximum ∆VOUT / VOUT is divided by the maximum ∆T.
Note 2: Thermal hysteresis is defined as the change in +25°C output voltage before and after cycling the device from TMAX to TMIN.
Note 3: Dropout voltage is defined as the minimum differential voltage (VIN - VOUT) at which VOUT decreases by 0.1% from its
original value at VIN = 5.0V (VIN = 5.5V for VOUT = 5.0V).
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Turn-On Settling Time tRTo VOUT = 0.01% of
nal value
CNR = 0 2 ms
CNR = 0.1µF 20
INPUT
Supply Voltage Range VIN Guaranteed by line-regulation test 5.2 12.6 V
Quiescent Supply Current IIN
TA = +25°C 380 550 µA
TA = -40°C to +125°C 725
MAX6126A_21
OUTPUT VOLTAGE TEMPERATURE DRIFT
(VOUT = 2.048V) (µMAX)
MAX6126 toc02
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1007550250-25
2.0480
2.0475
2.0485
2.0490
2.0470
-50 125
THREE TYPICAL PARTS
MAX6126A_50
OUTPUT VOLTAGE TEMPERATURE DRIFT
(VOUT = 5.000V) (SO)
MAX6126 toc03
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1007550250-25
5.000
4.999
5.001
5.002
4.998
-50 125
THREE TYPICAL PARTS
MAX6126A_21
OUTPUT VOLTAGE TEMPERATURE DRIFT
(VOUT = 2.048V) (SO)
MAX6126 toc01
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1007550250-25
2.0465
2.0470
2.0475
2.0480
2.0485
2.0490
2.0460
-50 125
THREE TYPICAL PARTS
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Electrical Characteristics—MAX6126_50 (VOUT = 5.000V) (continued)
Typical Operating Characteristics
(VIN = 5V for MAX6126_21/25/30/33/36/41, VIN = 5.5V for MAX6126_50, CLOAD = 0.1μF, IOUT = 0, TA = +25°C, unless otherwise
specied.) (Note 5)
MAX6126_25
DROPOUT VOLTAGE
vs. SOURCE CURRENT
MAX6126 toc07
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (mV)
12963
50
100
150
200
250
300
0
0 15
TA = +25°C
TA = -40°C
TA = +125°C
MAX6126A_50
OUTPUT VOLTAGE TEMPERATURE DRIFT
(VOUT = 5.000V) (µMAX)
MAX6126 toc04
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
1007550250-25
5.000
4.999
5.001
5.002
4.998
-50 125
THREE TYPICAL PARTS
MAX6126_50
DROPOUT VOLTAGE
vs. SOURCE CURRENT
MAX6126 toc08
SOURCE CURRENT (mA)
DROPOUT VOLTAGE (mV)
12963
50
100
150
200
250
0
0 15
TA = +25°C
TA = -40°C
TA = +125°C
MAX6126_21
LOAD REGULATION
MAX6126 toc05
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
50-5
2.0465
2.0470
2.0475
2.0480
2.0485
2.0460
-10 10
TA = +25°C
TA = -40°C
TA = +125°C
MAX6126_21
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX6126 toc09
FREQUENCY (kHz)
PSRR (dB)
1001010.10.01
-100
-80
-60
-40
-20
0
-120
0.001 1000
MAX6126_50
LOAD REGULATION
MAX6126 toc06
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
50-5
4.997
4.998
4.999
5.000
5.001
4.996
-10 10
TA = +25°C
TA = -40°C
TA = +125°C
MAX6126_50
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX6126 toc10
FREQUENCY (kHz)
PSRR (dB)
1001010.10.01
-100
-80
-60
-40
-20
0
-120
0.001 1000
MAX6126_21
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6126 toc11
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
12108642
100
200
300
400
500
600
0
0 14
TA = +25°C
TA = -40°C
TA = +125°C
MAX6126_50
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6126 toc12
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
12106 842
100
200
300
400
500
600
700
800
900
0
0 14
TA = +25°C
TA = -40°C
TA = +125°C
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MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Typical Operating Characteristics (continued)
(VIN = 5V for MAX6126_21/25/30/33/36/41, VIN = 5.5V for MAX6126_50, CLOAD = 0.1μF, IOUT = 0, TA = +25°C, unless otherwise
specied.) (Note 5)
MAX6126_21
OUTPUT NOISE (0.1Hz TO 10Hz)
MAX6126 toc13
1s/div
0.4µV/div
VOUT = 2.048V
MAX6126_50
OUTPUT NOISE (0.1Hz TO 10Hz)
MAX6126 toc14
1s/div
1µV/div
VOUT = 5V
MAX6126 toc15
6.5s/div
CNR = 100µF
0.6µVP-P
MAX6126_21
LOAD TRANSIENT
MAX6126 toc16
200µs/div
CLOAD = 0.1µF
VIN = 5V
IOUT = -100µA TO 1mA
VOUT = 2.048V
-100µA
1mA
VOUT
AC-COUPLED
20mV/div
IOUT
500µA/div
MAX6126_21
LOAD TRANSIENT
MAX6126 toc17
400µs/div
CLOAD = 0.1µF
VIN = 5V
IOUT = -1mA TO -10mA
VOUT = 2.048V
-10mA
-1mA
VOUT
AC-COUPLED
100mV/div
IOUT
5mA/div
MAX6126_21
LOAD TRANSIENT
MAX6126 toc18
1ms/div
CLOAD = 10µF
VIN = 5V
IOUT = 0 TO 10mA
VOUT = 2.048V
0mA
10mA
VOUT
AC-COUPLED
20mV/div
IOUT
5mA/div
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MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Typical Operating Characteristics (continued)
(VIN = 5V for MAX6126_21/25/30/33/36/41, VIN = 5.5V for MAX6126_50, CLOAD = 0.1μF, IOUT = 0, TA = +25°C, unless otherwise
specied.) (Note 5)
MAX6126_21
LOAD TRANSIENT
MAX6126 toc19
1ms/div
CLOAD = 10µF
VIN = 5V
IOUT = -100µA TO 1mA
VOUT = 2.048V
-100µA
+1mA
VOUT
AC-COUPLED
10mV/div
IOUT
500µA/div
MAX6126_21
LOAD TRANSIENT
MAX6126 toc20
400µs/div
CLOAD = 10µF
VIN = 5V
IOUT = -1mA TO -10mA
VOUT = 2.048V
-10mA
-1mA
VOUT
AC-COUPLED
50mV/div
IOUT
5mA/div
MAX6126_21
LINE TRANSIENT
MAX6126 toc21
2.7V
3.2V
VOUT
AC-COUPLED
20mV/div
VIN
200mV/div
20µs/div
VOUT = 2.048V CLOAD = 0.1µF
MAX6126_50
LINE TRANSIENT
MAX6126 toc22
5.2V
5.7V
VOUT
AC-COUPLED
10mV/div
VIN
200mV/div
400µs/div
VIN = 5.2V TO 5.7V
V
OUT
= 5V
CLOAD = 0.1µF
MAX6126_21
TURN-ON TRANSIENT
MAX6126 toc23
20µs/div
GND
5.5V
VOUT
1V/div
VIN
2V/div
CLOAD = 0.1µF
VOUT = 2.048V
MAX6126_50
TURN-ON TRANSIENT
MAX6126 toc24
GND
5.5V
VOUT
2V/div
VIN
2V/div
GND
200µs/div
CLOAD = 0.1µF
VOUT = 5V
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
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Typical Operating Characteristics (continued)
(VIN = 5V for MAX6126_21/25/30/33/36/41, VIN = 5.5V for MAX6126_50, CLOAD = 0.1μF, IOUT = 0, TA = +25°C, unless otherwise
specied.) (Note 5)
Note 5: Many of the MAX6126 Typical Operating Characteristics are extremely similar. The extremes of these characteristics are
found in the MAX6126_21 (2.048V output) and the MAX6126_50 (5.000V output). The Typical Operating Characteristics of
the remainder of the MAX6126 family typically lie between those two extremes and can be estimated based on their output
voltages.
2.5010
2.5005
2.5000
2.4995
2.4990
0 400200 600 800 1000
MAX6126B_25
LONG-TERM STABILITY vs. TIME (µMAX)
MAX6126 toc28
TIME (hr)
VOUT (V)
TWO TYPICAL PARTS
VOUT = 2.5V
MAX6126_21
TURN-ON TRANSIENT
MAX6126 toc25
GND
5.5V
VOUT
1V/div
VIN
2V/div
40µs/div
CLOAD = 10µF
VOUT = 2.048V
4.9994
4.9998
4.9996
5.0002
5.0000
5.0004
5.0006
0 400200 600 800 1000
MAX6126B_50
LONG-TERM STABILITY vs. TIME (SO)
MAX6126 toc29
TIME (hr)
VOUT (V)
TWO TYPICAL PARTS
VOUT = 5V
MAX6126_50
TURN-ON TRANSIENT
MAX6126 toc26
GND
5.5V
VOUT
2V/div
VIN
2V/div
GND
400µs/div
CLOAD = 10µF
VOUT = 5V
5.0010
5.0005
5.0000
4.9995
4.9990
0 400200 600 800 1000
MAX6126B_50
LONG-TERM STABILITY vs. TIME (µMAX)
MAX6126 toc30
TIME (hr)
VOUT (V)
TWO TYPICAL PARTS
VOUT = 5V
2.4994
2.4998
2.4996
2.5002
2.5000
2.5004
2.5006
0 400200 600 800 1000
MAX6126B_25
LONG-TERM STABILITY vs. TIME (SO)
MAX6126 toc27
TIME (hr)
VOUT (V)
TWO TYPICAL PARTS
VOUT = 2.5V
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MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
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Typical Operating Characteristics (continued)
Detailed Description
Wideband Noise Reduction
To improve wideband noise and transient power-supply
noise, add a 0.1μF capacitor to NR (Figure 1). A 0.1μF NR
capacitor reduces the noise from 60nV/√Hz to 35nV/√Hz
for the 2.048V output. Noise in the power-supply input
can affect output noise, but can be reduced by adding an
optional bypass capacitor between IN and GND, as shown
in the Typical Operating Circuit. The 0.1Hz to 10Hz noise
when measured with a 0.1µF noise reduction capacitor (NR
pin) is 0.9μVP-P. Using a 100µF noise reduction capacitor
(NR pin) reduces the 0.1Hz to 10Hz noise to 0.6μVP-P.
Output Bypassing
The MAX6126 requires an output capacitor between
0.1μF and 10μF. Locate the output capacitor as close
to OUTF as possible. For applications driving switching
capacitive loads or rapidly changing load currents, it
is advantageous to use a 10μF capacitor in parallel
with a 0.1μF capacitor. Larger capacitor values reduce
transients on the reference output.
Supply Current
The quiescent supply current of the series-mode MAX6126
family is typically 380μA and is virtually independent of the
supply voltage, with only a 2μA/V (max) variation with
supply voltage.
When the supply voltage is below the minimum specified
input voltage during turn-on, the device can draw up to
300μA beyond the nominal supply current. The input voltage
source must be capable of providing this current to ensure
reliable turn-on.
Thermal Hysteresis
Thermal hysteresis is the change of output voltage at
TA = +25°C before and after the device is cycled over its
entire operating temperature range. The typical thermal
hysteresis value is 20ppm (SO package).
Turn-On Time
These devices typically turn on and settle to within 0.1%
of their final value in 200μs to 2ms depending on the
device. The turn-on time can increase up to 4ms with the
device operating at the minimum dropout voltage and
the maximum load. A noise reduction capacitor of 0.1μF
increases the turn-on time to 20ms.
Output Force and Sense
The MAX6126 provides independent connections for the
power-circuit output (OUTF) supplying current into a load,
and for the circuit input regulating the voltage applied
to that load (OUTS). This configuration allows for the
cancellation of the voltage drop on the lines connecting
the MAX6126 and the load. When using the Kelvin
connection made possible by the independent current
and voltage connections, take the power connection
to the load from OUTF, and bring a line from OUTS to
join the line from OUTF, at the point where the voltage
accuracy is needed. The MAX6126 has the same type
of Kelvin connection to cancel drops in the ground return
line. Connect the load to ground and bring a connection
from GNDS to exactly the same point.
Figure 1. Noise-Reduction Capacitor
PIN NAME FUNCTION
1 NR
Noise Reduction. Connect a 0.1µF
capacitor to improve wideband noise.
Leave unconnected if not used (see
Figure 1).
2 IN Positive Power-Supply Input
3 GND Ground
4 GNDS Ground-Sense Connection. Connect to
ground connection at load.
5, 8 I.C. Internally Connected. Do not connect
anything to these pins.
6 OUTS Voltage Reference Sense Output
7OUTF
Voltage Reference Force Output.
Short OUTF to OUTS as close to the
load as possible. Bypass OUTF with a
capacitor (0.1µF to 10µF) to GND.
NR
OUTF
*OPTIONAL.
0.1µF*
OUTS
REFERENCE
OUTPUT
(VOUT + 200mV) TO 12.6V INPUT
IN
GND GNDS
MAX6126
*
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Pin Description
Applications Information
Precision Current Source
Figure 2 shows a typical circuit providing a precision
current source. The OUTF output provides the bias
current for the bipolar transistor. OUTS and GNDS sense
the voltage across the resistor and adjust the current
sourced by OUTF accordingly. For even higher precision,
use a MOSFET to eliminate base current errors.
The voltage range of OUTF is set by the reference output
voltage (OUTS) and the VBE(BJT) or VGS(MOS) of the
output external device:
VOUTF = VBE + VREF
where:
VOUTF is voltage on OUTF pin
VBE is base-emitter drop across BJT
VREF is the actual voltage reference output this part is
supposed to provide.
It translates to supply voltage requirement for voltage
reference:
VIN ≥ VDROP (dropout voltage) + VBEmax + VREF
where:
VDROP is dropout voltage of voltage reference
High-Resolution DAC and Reference from
a Single Supply
Figure 3 shows a typical circuit providing the reference for
a high-resolution, 16-bit MAX541 D/A converter.
Temperature Coefcient vs. Operating
Temperature Range for a 1 LSB Maximum Error
In a data converter application, the reference voltage of
the converter must stay within a certain limit to keep the
error in the data converter smaller than the resolution limit
through the operating temperature range. Figure 4 shows
the maximum allowable reference voltage temperature
coefficient to keep the conversion error to less than 1
LSB, as a function of the operating temperature range
(TMAX - TMIN) with the converter resolution as a parameter.
The graph assumes the reference voltage temperature
coefficient as the only parameter affecting accuracy.
In reality, the absolute static accuracy of a data converter
is dependent on the combination of many parameters
such as integral nonlinearity, differential nonlinearity, offset
error, gain error, as well as voltage reference changes.
Figure 2. Precision Current Source
Figure 3. 14-Bit High-Resolution DAC and Positive Reference
From a Single 3V Supply
OUTF
ISOURCE
R
OUTS
VOUT(NOMINAL) / R = ISOURCE
IN
GND GNDS
MAX6126
OUTF
OUTS
IN
GND GNDS
MAX6126
OUT
REF
ANALOG
OUTPUT
VDD
3V SUPPLY
GND
MAX541
DAC
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Series Voltage Reference
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Figure 4. Temperature Coefficient vs. Operating Temperature Range for a 1 LSB Maximum Error
TEMPERATURE
COEFFICIENT
(ppm/°C)
1 10 100
16 BIT
14 BIT
12 BIT
10 BIT
8 BIT
0.01
0.1
10
100
1000
1
10,000
18 BIT
20 BIT
OPERATING TEMPERATURE RANGE (TMAX - TMIN) (°C)
NR
OUTF
*OPTIONAL.
*
OUTS
REFERENCE
OUTPUT
(VOUT + 200mV) TO 12.6V INPUT
IN
GND GNDS
*
MAX6126
LOAD
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Chip Information
PROCESS: BiCMOS
Typical Operating Circuit
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
PART TEMP RANGE PIN-
PACKAGE
OUTPUT
VOLTAGE
(V)
MAXIMUM INITIAL
ACCURACY (%)
MAXIMUM TEMPCO
(-40°C to +85°C)
(ppm/°C)
MAX6126B21+ -40°C to +125°C 8 µMAX 2.048 0.1 7
MAX6126AASA25+ -40°C to +125°C 8 SO 2.500 0.02 3
MAX6126BASA25+ -40°C to +125°C 8 SO 2.500 0.06 5
MAX6126A25+ -40°C to +125°C 8 µMAX 2.500 0.06 3
MAX6126B25+ -40°C to +125°C 8 µMAX 2.500 0.1 7
MAX6126A28+ -40°C to +125°C 8 µMAX 2.800 0.06 3
MAX6126B28+ -40°C to +125°C 8 µMAX 2.800 0.1 7
MAX6126AASA30+ -40°C to +125°C 8 SO 3.000 0.02 3
MAX6126BASA30+ -40°C to +125°C 8 SO 3.000 0.06 5
MAX6126A30+ -40°C to +125°C 8 µMAX 3.000 0.06 3
MAX6126B30+ -40°C to +125°C 8 µMAX 3.000 0.1 7
MAX6126AASA33+ -40°C to +125°C 8 SO 3.300 0.02 3
MAX6126BASA33+ -40°C to +125°C 8 SO 3.300 0.06 5
MAX6126A33+ -40°C to +125°C 8 µMAX 3.300 0.06 3
MAX6126B33+ -40°C to +125°C 8 µMAX 3.300 0.1 7
MAX6126AASA36+ -40°C to +125°C 8 SO 3.600 0.02 3
MAX6126BASA36+ -40°C to +125°C 8 SO 3.600 0.06 5
MAX6126A36+ -40°C to +125°C 8 µMAX 3.600 0.06 3
MAX6126B36+ -40°C to +125°C 8 µMAX 3.600 0.1 7
MAX6126AASA41+ -40°C to +125°C 8 SO 4.096 0.02 3
MAX6126BASA41+ -40°C to +125°C 8 SO 4.096 0.06 5
MAX6126BASA41/V+ -40°C to +125°C 8 SO 4.096 0.06 5
MAX6126A41+ -40°C to +125°C 8 µMAX 4.096 0.06 3
MAX6126B41+ -40°C to +125°C 8 µMAX 4.096 0.1 7
MAX6126AASA50+ -40°C to +125°C 8 SO 5.000 0.02 3
MAX6126BASA50+ -40°C to +125°C 8 SO 5.000 0.06 5
MAX6126A50+ -40°C to +125°C 8 µMAX 5.000 0.06 3
MAX6126B50+ -40°C to +125°C 8 µMAX 5.000 0.1 7
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
8 μMAX U8+1 21-0036 90-0092
8 SO S8+4 21-0041 90-0096
MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
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Ordering Information (continued)
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/02 Initial release —
1 3/03 Remove “future product” and “contact factory” notes 1, 16
2 6/03 Add “A” grade devices 1, 16
3 12/03 Change μMAX part number 1, 16
4 7/04 Add top mark to Ordering Information 1, 16
5 12/10 Add 2.8V option, add lead-free options, update Package Information 1, 2, 4, 15, 16
6 8/12 Added automotive package, MAX6126BASA41/V+ to data sheet 17
7 4/16 Updated Typical Operating Characteristics section (added TOC15) 14, 15
8 6/16 Added Electrical Characteristics tables, text references, and Ordering Information
references for 3.3V and 3.6V output options. 1, 6, 9–13, 17
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2016 Maxim Integrated Products, Inc.
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MAX6126 Ultra-High-Precision, Ultra-Low-Noise,
Series Voltage Reference
Revision History
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