© 1998 Elantec, Inc.
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
General Description
The EL5144C series am plifiers are voltage feed back, high speed, rail
to rail amplifiers designed to operate on a single +5V supply. They
offer unity gain stability with an unloaded –3dB bandwidth of 100
MHz. Th e input com mon mod e vol tage ra nge exte nds f rom the neg a-
tive rail to within 1.5V of the positive rail. Driving a 75Ω double
terminated coaxial cable, the EL5144C series amplifiers drive to
within 150 mV of either rail. The 200 V/µsec slew rate and 0.1% / 0.1°
differential gain / differential phase makes these parts ideal for com-
posite and co mponent video applicat ions. With its voltage feedback
architecture, this amplifier can accept reactive feedback networks,
allowing them to be used in analog filtering applications These ampli-
fiers will source 90 mA and sink 65 mA.
The EL5146C and EL5246C have a power-savings disable feature.
Applying a standard TTL low logic level to the CE (Chip Enable) pin
reduces the supply current to 2.6 µA within 10 nsec. Turn on time is
500 nsec, allowing true break-before-make conditions for multiplex-
ing applications. Allowing the CE pin to float or applying a high logic
level will enable the amplifier.
For applications where board space is critical, singles are offered in a
SOT23-5 package, duals in MSOP-8 and MSOP-10 packages, and
quads in a QSOP-1 6 packag e. Sing les, duals and qu ads are also avail -
able in industry standard pinouts in SOIC and PDIP packages. All
parts operate over the industrial temperature range of -40°C to +85°C.
OUT
GND
VS
IN-
IN+
SOT23-5
1
2
3
5
4
-
+
EL5144C
Dual and Quad Amplifier Pin Conf igurations on Page 12
Pin Configurations
1
2
3
4
8
7
6
5
-
+
IN-
IN+
GND
NC
OUT
VS
NC
CE
SOIC- 8 , PDI P-8
EL5146C
Features
• Rail to Rail Output Swing
• -3 dB Bandwidt h = 100 MHz
• Single Supply +5V operation
• Power Down to 2.6 µA
• Large Input Common Mode Range
0V < VCM < 3.5 V
• Diff Gain /P ha se = 0.1% /0. 1°
• Low Power 35mW per amplifier
• Space Saving SOT23-5, MSOP-
8&10, & Q SO P- 1 6 pa c ka g ing
Applications
• Video Amplifier
• 5 Volt Analog Signal Processing
• Multiplexer
• Line Driver
• Port able Comp uters
• High Speed C ommunications
• Sample & Hold Amplifier
•Comparator
Ordering Information
Part No Temp. Range Package Outline #
EL5144CW -40°C to +8 5 °C 5 Pin SOT23 MDP0038
EL5146CN -40°C to +8 5 °C 8 Pin PDIP MDP0031
EL5146CS -40°C to +8 5 °C 8 Pin SOIC MDP0027
EL5244CN -40°C to +8 5 °C 8 Pin PDIP MDP0031
EL5244CS -40°C to +8 5 °C 8 Pin SOIC MDP0027
EL5244CY -40°C to +8 5 °C 8 Pin MSOP MDP0043
EL5246CN -40°C to +8 5 °C 14 Pin PDIP MDP0031
EL5246CS -40°C to +8 5 °C 14 Pin SOIC MDP0027
EL5246CY -40°C to +8 5 °C 10 Pin MSOP MDP00 43
EL5444CN -40°C to +8 5 °C 14 Pin PDIP MDP0031
EL5444CS -40°C to +8 5 °C 14 Pin SOIC MDP0027
EL5444CU -40°C to +8 5 °C 16 Pin QSOP MDP0040
0V
5V
EL5144C, EL5146C, EL5244C,
EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
March 1, 2000
2
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Absolute Maximum Ratings (TA = 25 °C)
Values beyond absolute maximum ratings can cause the device to be pre-
maturely damaged. Absolute maximum ratings are stress ratings only and
functional device operation is not implied.
Supply Voltage between VS and GND +6V
Maximum Continuous Output Current 50mA
Power Dissipation See Curves
Pin Voltages GND - 0.5V to VS +0.5V
Storage Temperature -65°C to +150°C
Operating Temperature -40°C to +85°C
Lead Temperature 260°C
Important Note:
All parameters having Min/Max specifications are guaranteed. T yp values are for information purposes only . Unless otherwise noted, all tests are at the specified
temperature and are pulsed tests, therefore: TJ = TC = TA.
Electrical Characteristics
VS=+5V, GND=0V, TA=25°C, CE = +2V, unless otherwise specified.
Parameter Description Conditions Min Typ Max Units
AC Performance
dG Differential Gain Error [1] G=2, RL=150Ω to 2.5V, RF=1KΩ0.1 %
dP Differential Phase Error [1] G= 2, RL=150Ω to 2.5V, RF=1KΩ0.1 deg
BW Bandwidth -3dB, G=1, RL=10kΩ, RF=0 100 MHz
-3dB, G=1, RL=150Ω, RF=0 60 MHz
BW1 Bandwidth ±0.1dB, G=1, RL=150Ω to GND, RF=0 8 MHz
GBWP Gain Bandwidth Product 60 MHz
SR Slew Rate G=1, RL=150Ω to GND, RF=0, VO=0.5V t o
3.5V 150 200 V/µs
ts Settling Time to 0.1%, VOUT = 0 to 3V 35 ns
DC Performance
AVOL Open Loop Voltage Gain RL=no load, VOUT=0.5V to 3V 54 65 dB
RL=150Ω to GND, VOUT=0.5V to 3V 40 50 dB
VOS Offset Voltage VCM=1V, SOT23-5 and MSOP packages 25 mV
VCM=1V, All other packages 15 mV
TCVOS Input Offset Voltage Temperature Coefficient 10 µV/OC
IBInput Bias Current VCM=0V & 3.5V 2 100 nA
Input Characteristics
CMIR Common Mode Input Range CMRR ≥ 47dB 0 3.5 V
CMRR Common Mode Rejection Ratio DC, VCM = 0 to 3.0V 50 60 dB
DC, VCM = 0 to 3.5V 47 60 dB
RIN Input Resistance 1.5 GΩ
CIN Input Capacitance 1.5 pF
Output Characteristics
VOP Positive Output Voltage Swing RL=150Ω to 2.5V [2] 4.70 4.85 V
RL=150Ω to GND [2] 4.20 4.65 V
RL=1KΩ to 2.5V [2] 4.95 4.97 V
VON Negative Output Voltage Swing RL=150Ω to 2.5V [2] 0.15 0.30 V
RL=150Ω to GND [2] 0V
RL=1K to 2.5V [2] 0.03 0.05 V
+IOUT Positive Output Current RL=10Ω to 2.5V 60 90 120 mA
3
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
-IOUT Negative Output Current RL=10Ω to 2.5V -50 -65 -80 mA
Enable (EL5146C & EL5246C Only)
tEN Enable Time EL5146C, EL5246C 500 nS
tDIS Disable T ime EL5146C, EL5246C 10 nS
IIHCE CE pin Input High Current CE = 5V, EL5146C, EL5246C 0.003 1 µA
IILCE CE pin Input Low Current CE = 0V, EL5146C, EL5246C -1.2 -3 µA
VIHCE CE pin Input High Voltage for Power Up EL5146C, EL5246C 2.0 V
VILCE CE pin Input Low Voltage for Power Down EL5146C, EL5246C 0.8 V
Supply
IsON Supply Current - Enabled (per amplifier) No Load, VIN= 0V, CE=5V 7 8.8 mA
IsOFF Supply Current - Disabled (per amplifier) No Load, VIN= 0V, CE=0V 2.6 5 µA
PSOR Power Supply Operating Range 4.75 5.0 5.25 V
PSRR Power Supply Rejection Ratio DC, VS = 4.75V to 5.25V 50 60 dB
1. Standard NTSC test, AC signal amplitude = 286 mVp-p, f=3.58 MHz, VOUT is swept from 0.8V to 3.4V, RL is DC coupled
2. RL is Total Load Resistance due to Feedback Resistor and Load Resistor
Electrical Characteristics
VS=+5V, GND=0V, TA=25°C, CE = +2V, unless otherwise specified.
Parameter Description Conditions Min Typ Max Units
4
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Typical Performance Curves
Inverting Frequency Response (Gain)
VCM = 1.5V, RF = 1KΩ, RL= 150Ω
1M 10M 100M
-6
-4
-2
0
+2
MAGNITUDE (NORMAILZED) (dB)
FREQUENCY (Hz)
1
AV = -1
AV = -2
AV = -5.6
Inverting Frequency Response (Phase)
VCM = 1.5V, RF = 1KΩ, RL= 150Ω
1M 10M 100M
0
45
90
135
180
PHASE (°)
FREQUENCY (Hz)
2
AV = -1
AV = -2
AV = -5.6
Non-Inverting Frequency Response (Gain)
VCM = 1.5V, RL = 150Ω
1M 10M 100M
-8
-6
-4
-2
0
MAGNITUDE (NORMALIZED) (dB)
FREQUENCY (Hz)
19
AV = +1, RF = 0Ω
+2
AV = +2, RF = 1KΩ
AV = +5.6, RF = 1KΩ
Non-Inverting Frequency Response (Phase)
VCM = 1.5V, RL= 150Ω
1M 10M 100M
-180
-135
-90
-45
0
FREQUENCY(Hz)
15
PHASE (°)
AV = +2, RF = 1KΩ
AV = +1, RF = 0 Ω
AV = +5.6, RF = 1KΩ
3dB Bandwidth vs. Die Temperature for Various Gains
RL = 10KΩ
3dB BANDWIDTH (MHz)
DIE TEMPERATURE (°C)
51
0
30
60
90
120
-55 -15 25 65 145105 145
150
AV = +1, RF = 0Ω
AV = +2, RF = 1KΩ
AV = +5.6, RF = 1K Ω
3dB Bandwidth vs. Die Temperatu re for Various G ains
RL = 150Ω
3dB BANDWIDTH (MHz)
DIE TEMPERATURE (°C)
52
0
20
40
60
80
-55 -15 25 65 145105 145
100
AV = +1, RF = 0Ω
AV = +2, RF = 1KΩ
AV = +5.6, RF = 1KΩ
5
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Group Delay vs. Frequency
1M 10M 100M
GROUP DELAY (nsec)
FREQUENCY (Hz)
23
0
2
4
6
8
10 AV = +2
RF = 1KΩ
AV = +1
RF = 0Ω
Frequency Response for Various RL
VCM = 1.5V, RF = 0Ω, AV = +1
1M 10M 100M
-4
-2
0
+2
+4
MAGNITUDE (NORMALIZED) (dB)
FREQUENCY (Hz)
16
RL= 10KΩ
RL= 520Ω
RL= 150Ω
RL= 520Ω
Frequency Response for Various CL
VCM = 1.5V, RL = 150Ω, AV = +1
1M 10M 100M
-8
-4
0
+4
+8
MAGNITUDE (NORMALI ZED) (dB)
FREQUENCY (Hz)
17
CL= 47pF
CL= 22pF
CL= 0pF
CL= 100pF
Frequency Response for Various RF and RG
VCM = 1.5V,RL = 150Ω, AV = +2
1M 10M 100M
-4
-2
0
+2
MAGNITUDE (NORMALIZED) (dB)
FREQUENCY (Hz)
18
RF = RG = 1KΩ
RF = RG = 560Ω
-6
RF = RG = 2KΩ
Open Loop Gain and Phase vs. Frequency
1K 100K 10M
GA IN (d B)
FREQUENCY (Hz)
29
0
20
40
60
80 RL = 1KΩ
Gain
RL = 150Ω
Phase
180
135
90
45
0
PHASE (°)
Open Loop Voltage Gain vs. Die Temperature
OPEN LOOP GAIN (dB)
DIE TE MP ERATURE (°C)
43
30
40
50
60
70
-55 -15 25 65 145105 145
80
No Lo ad
RL=150Ω
6
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Output Voltage Swing vs. Frequency for THD < 1%
RF = 1KΩ, AV = +2
1M 10M 100M
OUTPUT VOLTAGE SWING (VPP)
FREQUENCY (Hz)
21
0
1
2
3
4
5
RL = 500Ω to 2.5V
RL = 150Ω to 2.5V
Output Voltage Swing vs. Frequency for THD < 0.1%
RF = 1KΩ, AV = +2
1M 10M 100M
OUTPUT VOLTAGE SWING (VPP)
FREQUENCY (Hz)
22
0
1
2
3
4
5
RL = 500Ω to 2.5V
RL = 150Ω to 2.5V
10K 100K 1M 10M 100M
0.2
200
20
2
Closed Loop Output Im pedanc e vs. Freque ncy
RF = 0, AV = +1
CLOSED LOOP (Z
0
)
FREQUENCY (Hz)
26
PSRR and CMRR vs. Frequency
PSRR, CMRR (dB)
FREQUENCY (Hz)
28
-80
-60
-40
-20
0
+20
1K 10K 100K 1M 10M 100M
CMRR
-PSRR
+PSRR
Offset Voltage vs. Die Temperature
(6 Typical Sam ple s)
OFF SET VOLTAGE (mV)
DIE TEM P ERATURE (°C)
39
-12
-6
0
6
12
-55 -15 25 65 145105 145
1
10
100
1K
10 1K 100K 10M
10K
Voltage Noise vs. Frequency
VOLTAGE NOISE (nV/
√
Hz)
FREQUENCY (Hz)
65
7
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Slew Rate vs. Die Temperature
SLEW RATE (V/µS)
DIE TEMPERATURE (°C)
-55 -15 25 65 145105 145
200
150
250
48
Large Signal Pulse Response (Split Supplies)
VS= ±2.5V, RL = 150Ω to 0V, RF = 1K Ω, AV = +2
OUTPUT VOLTAGE (V)
TIME (20ns/DIV)
61
-2
0
+2
Large Signal Pulse Respons e (Single Supply)
VS= +5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2
OUTPUT VOLTAGE (V)
TIME (20ns/DIV)
62
1
2
3
4
0
Small Signal Pulse Response (Sing l e Supply)
VS= +5 V , RL = 150Ω to 0V, RF = 1KΩ, AV = +2
OUTPUT VOLTAGE (V)
TIME (20ns/DIV)
63
1.3
1.5
1.7
Small Signal Pulse Response (Split Supply)
VS= ±2.5V , RL = 150Ω to 0V, RF = 1KΩ, AV = +2
OUTPUT VOLTAGE (V)
TIME (20ns/DIV)
64
-0.2
0
+0.2
70 Settling Time vs. Settling Accuracy
RL=1KΩ, RF = 500Ω, AV = -1, VSTEP = 3V
0.01 0.1 1.0
SETTLING TIME (nsec)
SETTLING ACCURACY (%)
0
20
40
60
80
100
8
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
0.5 2.0 3.5
Differential Gain for RL Tied to 0V
RF = 1KΩ, AV = +2
DIFFERENTIAL GAIN (%)
VOUT (V)
32
-0.2
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
0.5 2.0 3.5
Differential Phase for RL Tied to 0V
RF = 1KΩ, AV = +2
DIFFERENTIAL PHASE (°)
VOUT (V)
34
-0.2
-0.1
0
+0.1
+0.2 RL = 150Ω
RL = 10KΩ
0.25 1.75 3.25
Differential Phase for RL Tied to 0V
RF = 0, AV = +1
DIFFERENTIAL PHASE (°)
VOUT (V)
53
-0.2
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
0.25 1.75 3.25
Differential Gain for RL Ti ed to 0V
RF = 0, AV = +1
DIFFERENTIAL GAIN (%)
VOUT (V)
54
-0.08
-0.04
0
+0.04
+0.08
RL = 150Ω
RL = 10KΩ
0.5 2.0 3.5
Differential Gai n for RL Tied to 2.5V
RF = 0, AV = +1
DIFFERENTIAL GAIN (%)
VOUT (V)
56
-0.2
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
0.5 2.0 3.5
Differenti al Phase for RL Tied to 2.5V
DIFFERENTIAL PHASE (°)
VOUT (V)
55
-.02
-0.1
0
+0.1
+0.2
RL =
RL =
0.5 2.0 3.5
Differenti al Phase for RL Tied to 2.5V
RF = 0, AV = +1
DIFFERENTIAL PHASE (°)
VOUT (V)
-.02
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
9
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
2nd and 3rd Harmonic Distortion vs. Frequency
VOUT = 0.25V to 2.25V, RL = 100Ω to 0V
1M 10M 100M
-75
-65
-55
-45
-35
-25
DISTORTION (dBc)
FREQUENCY (Hz)
52nd and 3rd Harmonic Distortion vs.Frequency
VOUT = 0.5V to 2.5V, RL = 100Ω to 0V
1M 10M 100M
-75
-65
-55
-45
-35
-25
DISTORTION (dBc)
FREQUENCY (Hz)
6
HD3
HD2
HD3
HD2
2nd and 3rd Harmonic Distortion vs. Frequency
VOUT = 1V to 3V, RL = 100Ω to 0V
1M 10M 100M
DISTORTION (dBc)
FREQUENCY (Hz)
7
-75
-65
-55
-45
-35
-25
HD3
HD2
0.5 2.0 3.5
Dif f erential Gain for RL Tied to 2.5V
RF = 1KΩ, AV = +2
DIFFERENTIAL GAIN (%)
VOUT (V)
31
-0.2
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
0.5 2.0 3.5
Differential Phase for RL Tied to 2.5V
RF = 1KΩ, AV = +2
DIFFERENTIAL PHASE (°)
VOUT (V)
33
-0.2
-0.1
0
+0.1
+0.2
RL = 150Ω
RL = 10KΩ
Channel to Channel Crosstalk- Duals and Quads
(Worst Channel)
CROSSTALK (dB)
FREQUENCY (H z)
27
100K 1M 10M 100M
-100
-80
-60
-40
-20
0
10
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
RL=150Ω to 2.5V
RL=150Ω to 0V
Negative Output Voltage Swing vs.
Die Temperature
OUTPUT VOLTAGE (V)
DIE TEMPERATURE (°C)
-55 -15 25 65 145105 145
0.4
0.3
0.1
0
0.2
0.5
41
Supply Current (per Amp) vs.
Supply Voltage
SUPPLY CURREN T (m A)
SUPPLY VOLTAGE (V)
44
0
2
4
6
8
012345
Output Current vs. Die Temperature
RL = 10Ω to 2.5V
OUTPUT CURRENT (mA)
DIE TEMPERATURE (°C)
45
Sink
Source
-55 -15 25 65 145105 145
100
80
40
20
60
120
Supply Current - ON (per amp) vs.
Die Temperature
SUPPLY CURRENT (mA)
DIE TE MP ERATURE (°C)
46
4
5
6
7
8
-55 -15 25 65 145105 145
9
Supply Current - OFF (per amp) vs.
Die Temperature
SUPPLY CURRENT (µA)
DIE TEMPERATURE (°C)
-55 -15 25 65 145105 145
4
3
1
0
2
5
47
Positive Output Voltage Swing vs. Die Temperature
RL = 150Ω
OUTPUT VOLTAGE (V)
DIE TEMPERATURE (°C)
69
4.5
4.6
4.7
4.8
4.9
-55 -15 25 65 145105 145
5.0
RL=150Ω to 0V
RL=150Ω to 2.5V
11
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Output Voltage from Either Rail vs. Die Temperature
for Various Effecti ve RLOAD
OUTPUT VOLTAGE (mV)
DIE TE MP ERATURE (°C)
40
Effective RLOAD = 150 Ω
1
10
100
300
-55 -15 25 65 145105 145
Effective RLOAD = 1KΩ
Effective RLOAD = 5KΩ
Effective RLOAD = RL//RF to VS/2
Maximum Power Dissipation vs. Ambient Temperature
Duals (TJMAX = 150°C)
POWER DISSIPATION (W)
AMBIENT TEMPERATURE (°C)
66
PDIP-14, ΘJA = 87°C/W
0
0.5
1.0
1.5
2.5
2.0
-50 10 40 70-20 100
SOIC-14, ΘJA = 120°C/W
PDIP-8, ΘJA = 107°C/W
SOIC-8, ΘJA = 159°C/W
MSOP-8,10, ΘJA = 206°C/W
Maximum Power Dissipation vs. Ambient Temperature
Quads (TJMAX = 150°C)
POWER DISSIPATION (W)
AMBIENT TEMPERATURE (°C)
68
PDIP-14, ΘJA = 83 °C/W
0
0.5
1.0
1.5
2.5
2.0
-50 10 40 70-20 100
SOIC-14, ΘJA = 118°C/W
QSOP-16, ΘJA = 158°C/W
Maximum Power Dissipation vs. Ambient Temperatur e
Singles (TJMAX = 150°C)
POWER DISSIPATI ON (W)
AMBIE N T TEMPERAT U RE (°C)
67
PDIP, ΘJA = 110°C/W
0
0.4
0.8
1.2
2.0
1.6
-50 10 40 70-20 100
SOIC, ΘJA = 161°C/W
SOT23-5, ΘJA = 256°C/W
71
10k 100k 1M 10M 100M
-120
-100
-80
-60
-40
OFF Isolation - EL5146C & EL5246C
FREQUENCY (Hz)
MAGNITUDE (dBc)
-20
EL 5146CS & EL5146CN
EL5246CS
EL5246CN
12
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
1
2
3
4
14
13
12
11
5
6
7
10
9
8
1
2
3
4
16
15
14
13
5
6
7
12
11
10
8 9
1
2
3
4
14
13
12
11
5
6
7
10
9
8
1
2
3
4
65
10
9
8
7
-
+
-
+
MSOP-10
EL5246C
INA-
OUTA
VS
OUTB
INB-
INA+
CEA
GND
CEB
INB+
-
+
-
+
-
+
-
+
IND+
IND-
GND
OUTD
INC-
INC+
OUTC
GND
INA-
INA+
VS
OUTA
INB+
INB-
OUTB
VS
-
+
-
+
-
+
-
+
INA-
INA+
OUTA
INB+
INB-
OUTB
VS
IND+
IND-
OUTD
INC-
INC+
OUTC
GND
-
+
-
+
NC
OUTA
INA-
OUTB
NC
INB-
VS
NC
CEA
INA+
CEB
NC
INB+
GND
1
2
3
4
8
7
6
5
-
+INB-
OUTB
INA-
INA+
GND INB+
VS
OUTA
-
+
SOIC-8 , PD IP-8, MSOP-8
SOIC-14, PDIP-14
SOIC-14, PDIP-14 QSOP-16
EL5444C
EL5444C
EL5244C
EL5246C
Single Amplifier Pin Conf igurations on Page 1
Pin Configurations
13
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Pin Description
EL5144C
(SOT23-5)
EL5146C
(SO/PDIP)
EL5244C
(SO/PDIP/MSOP)
EL5246C
(MSOP)
EL5246C
(SO/PDIP)
EL5444C
(SO/PDIP)
EL5444C
(QSOP)
Name Function Equivalent Circuit
57881144,5V
SPositive Power Supply
244341112,13GNDGround or Negative Power Supply
3 3 IN+ Noninverting Input
4 2 IN- Inverting Input (Reference Circuit 1)
1 6 OUT Amplifier Output
31133IN
A+ Amplifier A Noninverting Input (Reference Circuit 1)
210142 2IN
A- Amplifier A Inverting Input (Reference Circuit 1)
191311OUT
AAmplifier A Output (Reference Circuit 2)
55756IN
B+ Amplifier B Noninverting Input (Reference Circuit 1)
66867IN
B- Amplifier B Inverting Input (Reference Circuit 1)
77978OUT
BAmplifier B Output (Reference Circuit 2)
10 11 INC+ Amplifier C Noninverting Input (Reference Circuit 1)
910IN
C- Amplifier C Inverting Input (Reference Circuit 1)
8 9 OUTCAmplifier C Output (Reference Circuit 2)
12 14 IND+ Amplifier D Noninverting Input (Reference Circuit 1)
13 15 IND- Amplifier D Inverting Input (Reference Circuit 1)
14 16 OUTDAmplifier D Output (Reference Circuit 2)
VS
GNDCircuit 1
VS
GND
Circui t 2
14
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
8 CE Enable (Enabled when high)
2 3 CEA Enable Amplifier A (Enabled when high) (Reference Circuit 3)
4 5 CEB Enable Amplifier B (Enabled when high) (Reference Circuit 3)
1,5 2,6,
10,12
NC No Connect. Not internally connected.
Pin Description
EL5144C
(SOT23-5)
EL5146C
(SO/PDIP)
EL5244C
(SO/PDIP/MSOP)
EL5246C
(MSOP)
EL5246C
(SO/PDIP)
EL5444C
(SO/PDIP)
EL5444C
(QSOP)
Name Function Equivalent Circuit
Circuit 3
+
–
VS
1.4V
GND
15
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Description of Operation and Applications Information
Product Description
The EL5144C series is a family of wide bandwidth, sin-
gle supply, low power, rail-to-rail output, voltage
feedback operational amplifi ers. The family includes
single, dual, and quad co nfigurations . The singles and
duals are available with a power down pin t o reduce
power to 2.6µA typically. All the amplifiers are inter-
nally com pensated for closed loo p feedback gain s of +1
or greater. Larger gains are acceptable but bandwidth
will be reduced according to the familiar Gain-Band-
width Product.
Connected in voltage follower mode and driving a high
impedance load , the EL5144C series h as a -3dB band-
width of 100 MHz. Dri ving a 150Ω load, they hav e a
-3dB ban dwidth of 60 M Hz while maintaining a 200
V/µS slew rate. The input common mode voltage range
includes ground while the output can swing rail to rail.
Power Supply Bypass ing and Printed Circuit
Board Layout
As with any high-frequency device, good printed circuit
board layout is necessary for optimum performance.
Ground plane construction is highly recommended.
Lead lengths should be as short as possible. The power
supply pin must be well bypassed to reduce the risk of
oscillation For normal single supply operation, where
the GND pin is connected to the ground plane, a single
4.7 µF tantalum capacitor in parallel with a 0.1 µF
ceramic capacitor from VS to GND will suffice. This
same capacitor combination should be placed at each
supply pin to ground if split supplies are to be used. In
this case, the GND pin bec omes the negative supply rail.
For good AC performance, parasitic capacitance should
be kept to a minimum. Use of wire wound resistors
should be avoided because of their additional series
inductance. Use of sockets, particularly for the SO pack-
age, should be avoided if possible. Sockets add parasitic
inductance and capacitance that can result in compro-
mis e d pe r formance.
Input, Output, and Supply Voltage Range
The EL5144C series has been designed to operate with a
single supply voltage of 5V. Split supplies ca n be used
so long as their total range is 5V.
The amplifiers have an input common mode voltage
range that includes the negative supply (GND pin) and
extends to within 1.5V of the positive supply (VS pin).
They are specified over this range.
The output of the EL5144C series amplifiers can swing
rail to rail. As the load resistance becomes lower in
value, the ability to drive close to each rail is reduced.
However, even wi th an effective 150 Ω load resistor
connected to a volta ge h a lfway b e twe en th e sup pl y ra ils,
the output will swing to within 150mV of either rail.
16
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
Figure 1 show s the ou tpu t of the EL 51 44C se rie s amp li-
fier swinging rail to rail with RF = 1KΩ, AV = +2 and RL
= 1MΩ. Figure 2 is with RL = 150 Ω.
Choice of Feedback Resistor, RF
These amplifiers are optimized for applications that
require a gain of +1. Hence, no feedback resistor is
required. However, for gains greater than +1, the feed-
back resistor forms a pole with the input capacitance. As
this pole becomes larger, phase margin is reduced. This
causes rin ging in the time d omain and peakin g in th e fre-
quency domain. Therefore, RF has some maximum
value that should not be exceeded for optimum perfor-
mance. If a large value of RF must be used, a small
capacitor in the few picofarad range in parallel with RF
can help to reduce this ringing and peaking at the
expense of reducing the bandwidth.
As far as the output stage of the amplifier is concerned,
RF + RG appear in parallel with RL for gains other than
+1. As this combination gets smaller, the bandwidth
falls off. Consequently, RF also has a minimum value
that should not be exceeded for optimum performance.
For AV = +1, RF = 0 Ω is optimum. For AV = -1 or +2
(noise gain of 2), optimum response is obtained with RF
between 300 Ω and 1K Ω. For AV = -4 or +5 (noise gain
of 5), keep RF between 30 0 Ω and 15K Ω.
Video Performance
For good video signal integrity, an amplifier is required
to maintain the same out put impedanc e and the same fre-
quency response a s DC levels are changed at the output.
This can be difficult when driving a standard video load
of 150Ω, because of the change in output cu rrent with
DC level. A look at the Differential Gain and Differen-
tial Phase curves for various supply and loading
conditions will help you obtain optimal performance.
Curves are provided for AV = +1 and +2, and RL = 150Ω
and 10 K Ω tied bot h to g rou nd as well as 2. 5V. As wi th
all video amp lifie rs, the re is a commo n mode swee t spot
for optimum differential gain / differential phase. For
example, with AV = +2 an d RL = 15 0Ω ti ed to 2. 5V, an d
the output common mode voltage kept between 0.8V
and 3.2V, dG/dP is a very low 0.1% / 0.1°. This condi-
tion corresponds to driving an AC-coupled, double
terminated 75Ω coaxial cable. With AV = +1, RL =
150Ω tied to ground, and the vi deo level kept between
0.85V and 2 .95V, th ese amplifiers p rovide dG/dP pe r-
formance of 0.05% / 0.20°. This condition is
represent ative of using the EL5144 C series amplifier as
a buffer driving a DC coup led, double terminated, 75Ω
coaxial cable. Driving high impedance loads, such as
signals on computer video cards, gives similar or better
dG/dP performance as drivi ng cables.
Driving Cables and Capacitive Loads
The EL5144C series amplifiers can drive 50pF loads in
parallel with 150 Ω with 4d B of pe akin g an d 100 pF w ith
7dB of peaking. If less peaking i s desired i n these appli-
cations, a small series resisto r (usually between 5 Ω and
50 Ω) can be pla ced in series with th e output to elimin ate
most peaking. However, this will obviously r educe the
gain slightly. If your gain is greater than 1, the gain
resistor (RG) ca n th e n be ch os e n to m a ke u p for any ga in
0V
5V
Figure 1
0V
5V
Figure 2
17
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
loss which may be created by this additional resistor at
the output. Another method of reducing peaking is to
add a “snubber” circuit at the output. A snubber is a
resistor in a series with a capacitor, 150Ω and 100pF
being typical values. The advantage of a snubber is that
it does not draw DC load current.
When used as a cable driver, double termination is
always reco mmended for reflection-free performa nce.
For those applications, the back-termination series resis-
tor will de-co uple the EL5144C serie s amplifier from the
cable and allow extensive capaciti ve drive. Howeve r,
other applications may have high capacitive loads with-
out a back-termination resistor. Again, a small series
resistor at the output can reduce peaking.
Disable / Power-Down
The EL5146C and EL5246C amplifiers can be disabled,
placing its output in a high-impedance state. Turn off
time is only 10 nsec and turn on time is around 500 nsec.
When dis abl ed , th e amp lif i er’s supply current is reduced
to 2.6µA typically, thereby effectively eliminating
power c o nsum p tion. Th e am plifier’s power down can be
controlled by standard TTL or CMOS signal levels at the
CE pin. The applied logic signal is relative to the GND
pin. Letting the CE pin float will enable the amplifier.
Hence, the 8 pin PDIP and SOIC single amps are pin
compatible with standard amplifiers tha t don’t have a
power down feature.
Short Circuit Current Limit
The EL5144C series amplifiers do not have internal
short circuit protection circuitry. Short circuit current of
90 mA sour cing a nd 65 mA sin king typi cally will flow if
the output is trying to drive high or low but is shorted to
half way between the rails. If an output is shorted indef-
initely , the power dissipatio n could easily increa se such
that the part will be destroyed. Maximum relia bility is
maintained if the output c urrent never exceeds ±50mA.
This limit is set by internal metal interconnect limita-
tions. Obviously, short circuit conditions must not
remain or the internal metal connections will be
destroyed.
Power Di ssipatio n
With the high output drive capability of the EL5144C
series amplifiers, it is possible to exceed the 150°C
Absolute Maximum junction temperature under certain
load current conditions. Therefore, it is important to cal-
culate the maximum junction temperature for the
application to determine if load conditions or package
type need to be modified for t he amplifier to remain in
the safe operatin g area.
The maximum power dissipation allowed in a package is
determined according to :
where:
TJMAX = Maximum Junctio n Temperature
TAMAX = Maximum Ambi ent Temperature
θJA = Thermal Resistance of the Package
PDMAX = Maximum Power Dissipation
in the Package.
The maximum power dissipation actuall y produced by
an IC is the total quiescent supply curre nt tim es the tot al
power supply voltage, plus the power in the IC due to the
load, or:
where:
N = Number of amplifiers in the package
VS = Total Supply Voltage
PDMAX
TJMAX TAMAX
–
ΘJA
----------------------------------------------=
PDMAX NV
SISMAX V(SVOUT)VOUT
RL
----------------•–+•
•
=
18
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
ISMAX = Maximum Supply Current Per Amplifier
VOUT = Maximum Output Voltage of t he Application
RL = Load Resistance ti ed to Ground
If we set the two PDMAX equ ations equal t o each other,
we can solve for RL:
Assuming worst case conditions of TA = +85°C, Vout =
VS/2 V, VS = 5.5V, and ISMAX = 8.8mA per amplifier,
below is a table of all packages and the minimum RL
allowed.
EL5144C Series Comparator Application
The EL5144C series amplifier can be used as a very fast,
single sup ply compa r ator. Most op amps used as a com-
parator allow only slow speed operation because of
output saturation issues. The EL5144C series amplifier
doesn’t suffer from output saturation issues. Figure 3
shows the amplifier implemented as a comparator. Fig-
ure 4 is a graph of propagation delay vs. overdrive as a
square wave is presented at the input of the comparator.
Multiplexing with the EL5144C Series
Amplifier
Besides normal power down usage, the CE (Chip
Enable) pin on the EL5146C and EL5246C series ampli-
fiers also allow for multiplexing application s. Figure 5
shows an EL5246C with its outputs tied together, driv-
ing a back terminated 75Ω video load. A 3 Vp-p 10 MHz
sine wave is applied at Amp A input, and a 2.4 Vp-p 5
MHz square wave to Amp B. Figure 6 shows the
SELECT signal that is applied, and the resulting output
waveform at VOUT. Observe the break-before-make
operation of the multiplexing. Amp A is on and VIN1 is
being passed through to the output of the amplifier. Then
Amp A turns off in about 10 nsec. The output de cays to
Part Package Minimum RL
EL5144CW SOT23-5 37
EL5146CS SOIC-8 21
EL5146CN PDIP-8 14
EL5244CS SOIC-8 48
EL5244CN PDIP-8 30
EL5244CY MSOP-8 69
EL5246CY MSOP-10 69
EL5246CS SOIC-14 34
EL5246CN PDIP-14 23
EL5444CU QSOP-16 139
EL5444CS SOIC-14 85
EL5444CN PDIP-14 51
RL
VOUT VSVOUT)–(•
TJMAX TAMAX
–
NΘ• JA
----------------------------------------------
VSISMAX
•()–
----------------------------------------------------------------------------------------------=
1
2
3
4
8
7
6
5
+
–-
+
EL5146C
+5V
VIN
+2.5V
VOUT
RL
0.1µF
Propagation Delay vs. Overdrive for Ampli fier Used as a
Comparator
0.01 0.1 1.0
10
100
1000
PROPAGATION DELAY(nsec)
OVERDRIVE (V)
8
Negative Going Signal
Positive Goi ng Signal
Figure 3
Figure 4
19
EL5144C, EL5146C, EL52 44C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
ground with an RLCL t ime c onstants. 500 nsec later,
Amp B turns on and VIN2 is passed through to the out-
put. This break-before-make operation ensures that more
than one amplifier isn’t trying to drive the bus at the
same time. Notice the outputs are tied directly together.
Isolation resistors at each output are not necessary.
Free Running Oscillator Applicatio n
Figure 7 is an EL5144C configured as a free running
oscillator. To first order, ROSC and COSC determine the
frequency of oscillatio n according to:
For rail to rail output swings, maximum frequency of
oscillation is around 15 MHz. If reduced output swings
are acceptable, 25 MHz can be achieved. Figure 8 shows
the oscillator for ROSC = 510 Ω, C OSC = 240 pF and
FOSC = 6 MHz.
1
2
3
4
14
13
12
11
5
6
7
10
9
8
-
+
-
+
Select
+5V
VOUT
150Ω
VIN 1
3VPP
10MHz
0.1µF4.7µF
VIN 2
2.4VPP
5MHz
EL5246C
0V
5V
Figure 6
VOUT
Select
0V
5V
Figure 5
FOSC 0.72
ROSC C•OSC
------------------------------------=
Figure 7
Figure 8
5V
VOUT
0V
1
2
3
5
4
-
+
+5V
470K
470K 0.1µF
470K
ROSC
COSC
20
EL5144C, EL5146C, EL5244C, EL5246 C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
EL5144C, EL5146C, EL5244C, EL5246C, EL5444C
WARNI NG - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Suppo rt systems are equipme nt intended to sup -
port or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant per sonal i njury or death. Us ers con-
templatin g applicatio n of Elantec, Inc. P roducts in Li fe Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elan-
tec, Inc.’s warranty is limited to replacement of defective
component s and does not cov er injury to per sons or prop erty or
other consequential damages.
Elantec Semiconductor, Inc.
675 Tr ade Zone Blvd.
Milpitas, CA 95035
Telephone: ( 408) 945-1323
Toll Free: 1 - (888) ELANTEC
Fax: (408) 945-9305
European Office: 44-118-977-6020
March 1, 2000
Printed in U.S.A.
General Disclaimer
Specifications contained in this data sheet are i n effect as of the publ ication date shown. Elantec, Inc. reserves t he right to make changes in t he cir-
cuitry or specifica tions cont ained he rein a t any time without notice . Ela ntec, Inc . assume s no responsibili ty f or the use of any circui ts described
herein and makes no representations that they are free from patent infringement.
Japan Tech Center: 81-45-682-5820
Web Site: http://www.elantec.com
