OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DReplacements for ADI, PMI and LTC OP27
Series
Features of OP27A and OP27C:
DMaximum Equivalent Input Noise Voltage:
3.8 nV/√Hz at 1 kHz
5.5 nV/√Hz at 10 kHz
DVery Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
DLow Input Offset Voltage
OP27A ...25 μV Max
OP27C . . . 100 μV Max
DHigh Voltage Amplification
OP27A ...1 V/μV Min
OP27C ...0.7 V/μV Min
description
The OP27 operational amplifiers combine out-
standing noise performance with excellent
precision and high-speed specifications. The
wideband noise is only 3 nV/√Hz and with the 1/f
noise corner at 2.7 Hz, low noise is maintained for
all low-frequency applications.
The outstanding characteristics of the OP27 make
these devices excellent choices for low-noise
amplifier applications requiring precision
performance and reliability.
The OP27 series is compensated for unity gain.
The OP27A and OP27C are characterized for
operation over the full military temperature range
of −55°C to 125°C.
AVAILABLE OPTIONS
V max
STABLE
PACKAGE
TAVIOmax
AT 25°C
STABLE
GAIN CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
55°C to 125°C
25 μV 1 OP27AJG OP27AFK
−55°C to 125°C100 μV 1 OP27CJG —
Copyright © 2010, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
8
7
6
5
VIOTRIM
IN−
IN +
VCC −
VIOTRIM
VCC +
OUT
NC
JG PACKAGE
(TOP VIEW)
IN +
IN −
OUT
VIO TRIM
18
6
3
2
symbol
3 2 1 20 19
910111213
4
5
6
7
8
18
17
16
15
14
NC
VCC +
NC
OUT
NC
NC
1N−
NC
IN+
NC
FK PACKAGE
(TOP VIEW)
NC
NC
NC NC
NC
NC
NC − No internal connection
CC −
V
Pin numbers are for the JG packages.
IO
V TRIM
+
−
NC IO
V TRIM
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
T
emp
l
ate
R
e
l
ease
D
ate: 7−11−94
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
2POST OFFICE BOX 655303 DALLAS, TEXAS 75265
•
schematic
IN +
IN −
Q3
Q1A
Q1B Q2B Q2A
Q11
Q12
Q27 Q28
Q26
Q46
Q19
Q20
Q45
Q22
Q24Q23
Q21
Q6
VIO TRIM VIO TRIM
VCC +
OUT
VCC −
480 μA750
μA
260
μA
240 μA 120
μA
340
μA
C1†
†C1 = 120 pF for OP27
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC + (see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage, VCC − (see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI VCC ±
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of output short circuit unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input current (see Note 2) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: OP27A, OP27C −55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range −65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package 300°C. . . . . . . . . . . . . .
NOTES: 1. All voltage values are with respect to the midpoint between VCC + and VCC − unless otherwise noted.
2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive
input current will flow if a differential input voltage in excess of approximately ±0.7 V is applied between the inputs unless some
limiting resistance is used.
DISSIPATION RATING TABLE
PACKAGE TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 85°C
POWER RATING
TA = 125°C
POWER RATING
JG
FK
1050 mW
1375 mW
8.4 mW/°C
11.0 mW/°C
546 mW
715 mW
210 mW
275 mW
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
OP27A OP27C
UNIT
MIN NOM MAX MIN NOM MAX UNIT
Supply voltage, VCC + 4 15 22 4 15 22 V
Supply voltage, VCC − −4 −15 −22 −4 −15 −22 V
Common mode input voltage V
VCC ± = ±15 V, TA = 25°C±11 ±11
V
Common-mode input voltage, VIC VCC ± = ±15 V, TA = − 55°C to 125°C±10.3 ±10.2 V
Operating free-air temperature, TA−55 125 −55 125 °C
electrical characteristics at specified free-air temperature, VCC±= ±15 V (unless otherwise noted)
PARAMETER
T†
OP27A OP27C
UNIT
PARAMETER TEST CONDITIONS TA†
MIN TYP MAX MIN TYP MAX UNIT
V
Input offset voltage
V
= 0, VI
= 0 25°C 10 25 30 100
V
VIO Input offset voltage
,
RS = 50 Ω, See Note 3 Full range 60 300 μV
αVIO
Average temperature
coefficient of input
offset voltage
Full range 0.2 0.6 0.4 1.8 μV/°C
Long-term drift of input
offset voltage See Note 4 0.2 1 0.4 2 μV/mo
I
Input offset current
25°C 7 35 12 75
nA
IIO Input offset current VO = 0, VIC = 0 Full range 50 135 nA
I
Input bias current
25°C±10 ±40 ±15 ±80
nA
IIB Input bias current VO = 0, VIC = 0 Full range ±60 ±150 nA
V
Common-mode input
25°C
11
to
−11
11
to
−11
V
VICR
Common mode
input
voltage range
Full range
10.3
to
−10.3
10.5
to
−10.5
V
RL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5
VOM Peak output voltage swing RL ≥ 0.6 kΩ ±10 ±11.5 ±10 ±11.5 V
VOM
Peak
output
voltage
swing
RL ≥ 2 kΩFull range ±11.5 10.5
V
RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500
Large signal differential
RL ≥ 1 kΩ, VO = ±10 V 800 1500 1500
AVD Large-signal differential
voltage amplification RL ≥ 0.6 kΩ, VO = ±1 V,
VCC± = ± 4 V 250 700 200 500 V/mV
RL ≥ 2 kΩ, VO = ±10 V Full range 600 300
ri(CM)
Common-mode input
resistance 3 2 GΩ
roOutput resistance VO = 0, IO = 0 25°C 70 70 Ω
CMRR
Common-mode rejection VIC = ±11 V 25°C114 126 100 120
dB
CMRR
Common mode
rejection
ratio VIC = ±10 V Full range 110 94 dB
k
Suppl
y
volta
g
e rejection VCC ±= ±4 V to ±18 V 25°C 100 120 94 118
dB
kSVR
Supply
voltage
rejection
ratio VCC ±= ±4.5 V to ±18 V Full range 96 86 dB
†Full range is − 55°C to 125°C.
NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 μV
(see Figure 3).
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27 operating characteristics, VCC± = ±15 V, TA = 255C
PARAMETER
TEST CONDITIONS
OP27A OP27C
UNIT
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
SR Slew rate AVD ≥ 1, RL ≥ 2 kΩ1.7 2.8 1.7 2.8 V/μs
VN(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 26 0.225 0.375 0.225 0.375 μV
V
Equivalent input noise voltage
f = 10 Hz, RS = 20 Ω3.5 8 3.8 8
nV/√H
VnEquivalent input noise voltage f = 1 kHz, RS = 20 Ω3 4 3.2 4 nV/√Hz
I
Equivalent input noise current
f = 10 Hz, See Figure 27 5 25 5 25
pA/√H
InEquivalent input noise current f = 1 kHz, See Figure 27 0.7 2.5 0.7 2.5 pA/√Hz
Gain-bandwidth product f = 100 kHz 5 8 5 8 MHz
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VIO Input offset voltage vs Temperature 1
ΔVIO Change in input offset voltage vs Time after power on
vs Time (long-term drift)
2
3
IIO Input offset current vs Temperature 4
IIB Input bias current vs Temperature 5
VICR Common-mode input voltage range vs Supply voltage 6
VOM Maximum peak output voltage vs Load resistance 7
VO(PP) Maximum peak-to-peak output voltage vs Frequency 8
AVD Differential voltage amplification
vs Supply voltage
vs Load resistance
vs Frequency
9
10
11, 12
CMRR Common-mode rejection ratio vs Frequency 13
kSVR Supply voltage rejection ratio vs Frequency 14
SR Slew rate vs Temperature 15
φmPhase margin vs Temperature 16
φPhase shift vs Frequency 11
VnEquivalent input noise voltage
vs Bandwidth
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
17
18
19
20
21
Gain-bandwidth product vs Temperature 16
IOS Short-circuit output current vs Time 22
ICC Supply current vs Supply voltage 23
Pulse response Small signal
Large signal
24
25
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
100
80
60
40
20
0
− 20
− 40
− 60
− 80
− 100
− 50 − 25 0 25 50 75 100 125
− Input Offset Voltage − V
TA − Free-Air Temperature − °C
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
vs
FREE-AIR TEMPERATURE
VCC ± = ±15 V
10
5
0
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
ELAPSED TIME
12345
Time After Power On − minutes
IO μV
ΔVIO − Change in Input Offset Voltage − Vμ
VCC ±= ±15 V
TA = 25°C
OP27C
OP27C
OP27A
OP27A
OP27C
OP27A
Figure 1 Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
6
2
4
0
− 2
− 4
− 6
012345678
Time − months
0.2-μV/mo Trend Line
0.2-μV/mo Trend Line
ΔVIO − Change in Input Offset Voltage − Vμ
Figure 3
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
8POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
INPUT OFFSET CURRENT
vs
FREE-AIR TEMPERATURE
− Input Offset Current − nA
TA − Free-Air Temperature − °C
50
40
30
20
10
0
− 75 − 50 − 25 0 50 75 100 12525
VCC ± = ±15 V
OP27C
OP27A
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
TA − Free-Air Temperature − °C
±50
±40
±30
±20
±10
0
− 50 − 25 0 50 75 100 12525
IIO
− Input Bias Current − nA
IIB
− 75
OP27C
OP27A
VCC ± = ±15 V
Figure 4 Figure 5
20
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
vs
SUPPLY VOLTAGE
0±5±10 ±15 ±20
VCC + − Supply Voltage − V
VICR − Common-Mode Input Voltage Range Limits − V
TA = − 55°C
TA = 125°C
TA = − 55°C
TA = 125°C
TA = 25°C
TA = 25°C
− Maximum Peak Output Voltage − VV
OM
MAXIMUM PEAK OUTPUT VOLTAGE
vs
LOAD RESISTANCE
18
16
14
12
10
8
6
4
2
0
0.1 1 10
RL − Load Resistance − kΩ
16
12
8
4
0
− 4
− 8
− 12
− 16
VCC ± = ±15 V
TA = 25°C
Positive
Swing
Negative
Swing
ÁÁ
ÁÁ
ÁÁ
VICR
Figure 6 Figure 7
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1 k
V
OP27
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
OPP − Maximum Peak-to-Peak Output Voltage − V
28
24
20
16
12
8
4
10 k 100 k 1 M 10 M
f − Frequency − Hz
0
ÁÁ
ÁÁ
ÁÁ
ÁÁ
VO(PP)
VCC ± = ±15 V
RL = 1 kΩ
TA = 25°C
Figure 8.
24002500
10
OP27A
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
TOTAL SUPPLY VOLTAGE
A
OP27A
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
LOAD RESISTANCE
VD − Differential Voltage Amplification − V/mV
AVD − Differential Voltage Amplification − V/mV
0.1 110
100
RL − Load Resistance − kΩVCC + − VCC − − Total Supply Voltage − V
0 20304050
2000
1500
1000
500
0
2200
2000
1800
1600
1400
1200
1000
800
600
400
VO = ±10 V
TA = 25°C
RL = 1 kΩ
VCC ± = ±15 V
VO = ±10 V
TA = 25°C
RL = 2 kΩ
Figure 9 Figure 10
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
1
OP27
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
25
20
15
10
5
0
− 5
10 100
f − Frequency − Hz
− 10
− Differential Voltage Amplification − dBAVD
80°
100°
120°
140°
160°
180°
200°
220°
Phase Shift
AVD
φm = 70°
VCC ± = ±15 V
RL = 1 kΩ
TA = 25°C
Figure 11.
OP27A
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
f − Frequency − Hz
VCC ± = ±15 V
RL = 2 kΩ
TA = 25°C
CMRR − Common-Mode Rejection Ratio − dB
1 k
OP27A
COMMON-MODE REJECTION RATIO
vs
FREQUENCY
140
10 k 100 k 1 M 10 M
f − Frenquency − Hz
40
VCC ± = ±15 V
VIC = ±10 V
TA = 25°C
120
100
80
60
140
120
100
80
60
40
20
0
−20
0.1 1 10 100 1 k 10 k 1 M 100 M
− Differential Voltage Amplification − dBAVD
OP27A
OP27A
Figure 12 Figure 13
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
SUPPLY VOLTAGE REJECTION RATIO
vs
FREQUENCY
f − Frequency − Hz
− Supply Voltage Rejection Ratio − dBk
VCC ±= ±4 V to ±18 V
TA = 25°C
SLEW RATE
vs
FREE-AIR TEMPERATURE
TA − Free Air Temperature − °C
VCC ±= ±15 V
RL ≥ 2 kΩ
SVR
160
140
120
100
80
60
40
20
0
6
4
2
0
1 10 100 1 k 10 k 100 k 1 M 10 M 100 M − 50 − 25 0 25 50 75 100 125
SR − Slew Rate − V/μs
OP27
(AVD ≥ 1)
Positive
Supply
Negative
Supply
Figure 14 Figure 15
OP27
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
Gain-Bandwidth Product − MHz
TA − Free-Air Temperature − °C
− 75 − 50 − 25 0 50 75 100 12525
VCC ± = ±15 V
GBW (f = 100 kHz)
75°
65°
55°
45°
35°
8.6
8.2
7.8
7.4
7
Φ − Phase Margin
φm
ÁÁ
ÁÁ
m
φ
80°
70°
60°
50°
40°
85°
10.6
10.2
9.8
9.4
9
11
Figure 16.
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
V
EQUIVALENT INPUT NOISE VOLTAGE
vs
BANDWIDTH
VCC ±=±15 V
RS = 20 Ω
TA = 25°C
nV/ Hz
n − Equivalent Input Noise Voltage −
Total Equivalent Input Noise Voltage −
μV
10
1
0.1
0.01
0.1 110
100
Bandwidth − kHz
(0.1 Hz to frequency indicated)
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
10 k1 k
100
100
10
1
RS − Source Resistance − Ω
−
+
RS = R1 + R2
R1
R2
f = 1 kHz Resistor Noise Only
f = 10 Hz
VCC ±=±15 V
BW = 1 Hz
TA = 25°C
Figure 17 Figure 18
nV/ Hz
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
vs
TOTAL SUPPLY VOLTAGE
VCC + − VCC − − Total Supply Voltage − V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
f = 10 Hz
20
15
10
5
0010203040
f = 1 kHz
− 50 − 25 0 25 50 75 100 12
5
TA − Free-Air Temperature − °C
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREE-AIR TEMPERATURE
VCC ± = ±15 V
RS = 20 Ω
BW = 1 Hz
5
4
3
2
1
Vn − Equivalent Input Noise Voltage −
nV/ HzVn − Equivalent Input Noise Voltage −
f = 10 Hz
f = 1 kHz
Figure 19 Figure 20
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
nV/ HzVn − Equivalent Input Noise Voltage −
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
110 100 1000
f − Frequency − Hz
10
9
8
7
6
5
4
3
2
1
1/f Corner = 2.7 Hz
VCC ±=±15 V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
Figure 21
012345
60
50
40
30
20
10
SHORT-CIRCUIT OUTPUT CURRENT
vs
ELAPSED TIME
SUPPLY CURRENT
vs
TOTAL SUPPLY VOLTAGE
VCC +− VCC − − Total Supply Voltage − V
TA = 125°C
5
4
3
2
1515253545
ICC − Supply Current − mA
t − Time − minutes
IOS − Short-Circuit Output Current − mA
VCC ±=±15 V
TA = 25°C
IOS +
TA = − 55°C
ÁÁ
ÁÁ
ÁÁ
OS
I
ÁÁ
ÁÁ
ÁÁ
CC
I
IOS −
TA = 25°C
Figure 22 Figure 23
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
14 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
V
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
PULSE RESPONSE
80
60
40
20
0
− 20
− 40
− 60
− 80
O − Output Voltage − mV
t − Time − μs
0 0.5 1 1.5 2 2.5 3
VCC ±=±15 V
AV = 1
CL = 15 pF
TA = 25°C
VO − Output Voltage − V
OP27
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
8
6
4
0
− 2
− 4
− 6
− 8
2
t − Time − μs
024681012
VCC ± = ±15 V
AV = − 1
TA = 25°C
Figure 24 Figure 25
APPLICATION INFORMATION
general
The OP27 series devices can be inserted directly onto OP07, OP05, μA725, and SE5534 sockets with or without
removing external compensation or nulling components. In addition, the OP27 can be fitted to μA741 sockets
by removing or modifying external nulling components.
noise testing
Figure 26 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27. The frequency
response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because the time limit
acts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz, the test time
to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.
Measuring the typical 80-nV peak-to-peak noise performance of the OP27 requires the following special test
precautions:
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise testing (continued)
1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, the
offset voltage typically changes 4 μV due to the chip temperature increasing from 10°C to 20°C starting
from the moment the power supplies are turned on. In the 10-s measurement interval, these
temperature-induced effects can easily exceed tens of nanovolts.
2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.
3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect that
increases observed noise.
4.3 kΩ
110 kΩ
2.2 μF
Oscilloscope
Rin = 1 MΩ
22 μF
100 kΩ
0.1 μF
LT1001
4.7 μF
2 kΩ
100 kΩ
10 Ω
0.1 μF
Voltage
Gain = 50,000
+
−
OP27
Device
Under
Test
24.3 kΩ
0.01 0.1 1 10 100
AVD − Differential Voltage Amplification − dB
100
90
80
70
60
50
40
30
f − Frequency − Hz
+
−
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 26. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
16 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
noise testing (continued)
When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hz
noise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading since
both results are determined by the white noise and the location of the 1/f corner frequency.
Figure 27 shows a circuit measuring current noise and the formula for calculating current noise.
+
−
10kΩ
Vno
100 Ω500 kΩ
500 kΩ[Vno2 − (130 nV)2]1/2
1 MΩ × 100
In =
Figure 27. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 are permanently trimmed to a low level at wafer
testing. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometer as shown in
Figure 28 does not degrade the temperature coefficient αVIO. Trimming to a value other than zero creates an
αVIO of VIO/300 μV/°C. For example, if VIO is adjusted to 300 μV, the change in αVIO is 1 μV/°C.
The adjustment range with a 10-kΩ potentiometer is approximately ±2.5 mV. If a smaller adjustment range is
needed, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer in
conjunction with fixed resistors. The example in Figure 29 has an approximate null range of ±200 μV.
+
−
−15 V
Output
2
3
7
8
4
1
Input 6
15 V
10 kΩ
−15 V
Output
2
3
7
8
4
1
Input 6
4.7 kΩ
Figure 28. Standard Input Offset
Voltage Adjustment
Figure 29. Input Offset Voltage Adjustment With
Improved Sensitivity
15 V
1 kΩ
4.7 kΩ
offset voltage and drift
Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilar
metals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝VIO of the
amplifier. Air currents should be minimized, package leads should be short, and the two input leads should be
close together and at the same temperature.
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 30 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, and
AVD = 100.
15 V
+
−
−15 V
R1
50 kΩ
R2
100 Ω
R3
50 kΩ
VO = 1000 VIO
2
3
6
7
4
NOTE A: Resistors must have low thermoelectric potential.
Figure 30. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (>1 V),
is shown in the pulsed-operation diagram in Figure 31.
+
−
Rf
Output
2.8 V/μs
OP27
Figure 31. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively
short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the
signal generator. When Rf ≥ 500 Ω, the output is capable of handling the current requirements (load
current ≤20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
Rf > 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift and
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with Rf eliminates this problem.
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
18 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
unity gain buffer applications (continued)
To Gate
Drive
#1
+
−
Typical
Multiplexing
FET Switches
#2
+
−
#24
+
−
Cold-Junction
Circuitry
+−
−
+
Output
0.05 μF100 kΩ
High-Quality
Single-Point Ground 10 Ω
AVD = 10,000
Type S Thermocouples
5.4 μV/°C at 0°C
60
40
20
0
0246
Noise Voltage − nV
80
100
t − Time − seconds
120
810
OP27
NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot be
limited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.11 μV, which is equivalent to an error
of only 0.02°C.
Figure 32. Low-Noise, Multiplexed Thermocouple Amplifier and
0.1-Hz to 10-Hz Peak-to-Peak Noise Voltage
PACKAGE OPTION ADDENDUM
www.ti.com 25-Jan-2012
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
JM38510/13506BPA ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type
M38510/13506BPA ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type
OP27AFKB ACTIVE LCCC FK 20 1 TBD POST-PLATE N / A for Pkg Type
OP27AJGB ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type
OP27CJGB ACTIVE CDIP JG 8 1 TBD A42 N / A for Pkg Type
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
MECHANICAL DATA
MCER001A – JANUARY 1995 – REVISED JANUAR Y 1997
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
JG (R-GDIP-T8) CERAMIC DUAL-IN-LINE
0.310 (7,87)
0.290 (7,37)
0.014 (0,36)
0.008 (0,20)
Seating Plane
4040107/C 08/96
5
4
0.065 (1,65)
0.045 (1,14)
8
1
0.020 (0,51) MIN
0.400 (10,16)
0.355 (9,00)
0.015 (0,38)
0.023 (0,58)
0.063 (1,60)
0.015 (0,38)
0.200 (5,08) MAX
0.130 (3,30) MIN
0.245 (6,22)
0.280 (7,11)
0.100 (2,54)
0°–15°
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T8
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