EL5144C [ELANTEC]
100 MHz Single Supply Rail to Rail Amplifier; 100MHz的单电源轨到轨放大器
| 型号： | EL5144C |
| 厂家： | 
ELANTEC SEMICONDUCTOR |
| 描述： | 100 MHz Single Supply Rail to Rail Amplifier |
| 文件： | 总20页 (文件大小：923K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EL5144C, EL5146C, EL5244C,
EL5246C, EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Features
General Description
• Rail to Rail Output Swing
The EL5144C series amplifiers are voltage feedback, 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. The input common mode voltage range extends from the nega-
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 component video applications. 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.
5V
0V
• -3 dB Bandwidth = 100 MHz
• Single Supply +5V operation
• Power Down to 2.6 µA
• Large Input Common Mode Range
0V < VCM < 3.5 V
• Diff Gain/Phase = 0.1%/0.1°
• Low Power 35mW per amplifier
• Space Saving SOT23-5, MSOP-
8&10, & QSOP-16 packaging
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-16 package. Singles, duals and quads 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.
Applications
• Video Amplifier
• 5 Volt Analog Signal Processing
• Multiplexer
• Line Driver
Pin Configurations
• Portable Computers
• High Speed Communications
• Sample & Hold Amplifier
• Comparator
SOIC-8, PDIP-8
SOT23-5
NC
IN-
CE
1
2
3
4
8
7
6
5
OUT
GND
IN+
1
2
3
5
4
V
S
Ordering Information
V
S
-
Part No
EL5144CW
EL5146CN
EL5146CS
EL5244CN
EL5244CS
EL5244CY
EL5246CN
EL5246CS
EL5246CY
EL5444CN
EL5444CS
EL5444CU
Temp. Range
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package
5 Pin SOT23
8 Pin PDIP
8 Pin SOIC
8 Pin PDIP
8 Pin SOIC
8 Pin MSOP
14 Pin PDIP
14 Pin SOIC
10 Pin MSOP
14 Pin PDIP
14 Pin SOIC
16 Pin QSOP
Outline #
MDP0038
MDP0031
MDP0027
MDP0031
MDP0027
MDP0043
MDP0031
MDP0027
MDP0043
MDP0031
MDP0027
MDP0040
+
IN+
OUT
NC
IN-
GND
EL5144C
EL5146C
Dual and Quad Amplifier Pin Configurations on Page 12
© 1998 Elantec, Inc.
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
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.
Power Dissipation
Pin Voltages
See Curves
GND - 0.5V to VS +0.5V
-65°C to +150°C
-40°C to +85°C
Storage Temperature
Operating Temperature
Lead Temperature
Supply Voltage between VS and GND
Maximum Continuous Output Current
+6V
50mA
260°C
Important Note:
All parameters having Min/Max specifications are guaranteed. Typ 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
[1]
[1]
dG
dP
Differential Gain Error
Differential Phase Error
G=2, RL=150Ω to 2.5V, RF=1KΩ
G=2, RL=150Ω to 2.5V, RF=1KΩ
-3dB, G=1, RL=10kΩ, RF=0
0.1
0.1
100
60
%
deg
BW
Bandwidth
MHz
MHz
MHz
MHz
V/µs
-3dB, G=1, RL=150Ω, RF=0
BW1
GBWP
SR
Bandwidth
±0.1dB, G=1, RL=150Ω to GND, RF=0
8
Gain Bandwidth Product
Slew Rate
60
G=1, RL=150Ω to GND, RF=0, VO=0.5V to
150
200
3.5V
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
40
65
50
dB
dB
RL=150Ω to GND, VOUT=0.5V to 3V
VCM=1V, SOT23-5 and MSOP packages
VCM=1V, All other packages
VOS
Offset Voltage
25
15
mV
mV
TCVOS
IB
Input Offset Voltage Temperature Coefficient
Input Bias Current
10
2
µV/O
C
VCM=0V & 3.5V
100
3.5
nA
Input Characteristics
CMIR
Common Mode Input Range
CMRR ≥ 47dB
0
V
dB
dB
GΩ
pF
CMRR
Common Mode Rejection Ratio
DC, VCM = 0 to 3.0V
DC, VCM = 0 to 3.5V
50
47
60
60
RIN
CIN
Input Resistance
Input Capacitance
1.5
1.5
Output Characteristics
VOP
Positive Output Voltage Swing
RL=150Ω to 2.5V [2]
RL=150Ω to GND [2]
RL=1KΩ to 2.5V [2]
RL=150Ω to 2.5V [2]
RL=150Ω to GND [2]
RL=1K to 2.5V [2]
RL=10Ω to 2.5V
4.70
4.20
4.95
4.85
4.65
4.97
0.15
0
V
V
V
VON
Negative Output Voltage Swing
Positive Output Current
0.30
V
V
0.03
90
0.05
120
V
+IOUT
60
mA
2
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Electrical Characteristics
VS=+5V, GND=0V, TA=25°C, CE = +2V, unless otherwise specified.
Parameter Description
-IOUT Negative Output Current
Enable (EL5146C & EL5246C Only)
Conditions
Min
Typ
Max
Units
RL=10Ω to 2.5V
-50
-65
-80
mA
tEN
Enable Time
EL5146C, EL5246C
500
10
nS
nS
µA
µA
V
tDIS
Disable Time
EL5146C, EL5246C
IIHCE
IILCE
VIHCE
VILCE
Supply
IsON
CE pin Input High Current
CE pin Input Low Current
CE pin Input High Voltage for Power Up
CE pin Input Low Voltage for Power Down
CE = 5V, EL5146C, EL5246C
CE = 0V, EL5146C, EL5246C
EL5146C, EL5246C
0.003
-1.2
1
-3
2.0
EL5146C, EL5246C
0.8
V
Supply Current - Enabled (per amplifier)
Supply Current - Disabled (per amplifier)
Power Supply Operating Range
No Load, VIN= 0V, CE=5V
No Load, VIN= 0V, CE=0V
7
8.8
5
mA
µA
V
IsOFF
PSOR
PSRR
2.6
5.0
60
4.75
50
5.25
Power Supply Rejection Ratio
DC, VS = 4.75V to 5.25V
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
3
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Typical Performance Curves
Non-Inverting Frequency Response (Gain)
Non-Inverting Frequency Response (Phase)
CM = 1.5V, RL= 150Ω
19
15
VCM = 1.5V, RL = 150Ω
V
+2
0
AV = +1, RF = 0Ω
AV = +1, RF = 0Ω
0
-45
-90
-2
-4
-6
-8
A = +2, RF = 1KΩ
V
A = +2, RF = 1KΩ
V
A = +5.6, RF = 1KΩ
V
-135
-180
A = +5.6, RF = 1KΩ
V
1M
10M
FREQUENCY (Hz)
100M
1M
10M
FREQUENCY(Hz)
100M
Inverting Frequency Response (Gain)
VCM = 1.5V, RF = 1KΩ, RL= 150Ω
Inverting Frequency Response (Phase)
1
2
VCM = 1.5V, RF = 1KΩ, RL= 150Ω
+2
0
AV = -1
AV = -2
A = -1
180
135
90
45
0
V
A = -2
V
AV = -5.6
A = -5.6
V
-2
-4
-6
1M
10M
100M
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
3dB Bandwidth vs. Die Temperature for Various Gains
RL = 150Ω
3dB Bandwidth vs. Die Temperature for Various Gains
RL = 10KΩ
52
100
51
150
120
90
60
30
0
AV = +1, RF = 0Ω
80
60
40
20
0
AV = +1, RF = 0Ω
AV = +2, RF = 1KΩ
AV = +5.6, RF = 1KΩ
AV = +2, RF = 1KΩ
AV = +5.6, RF = 1KΩ
-55
-15
25
65
105
145
-55
-15
25
65
105
145
DIE TEMPERATURE (°C)
DIE TEMPERATURE (°C)
4
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Frequency Response for Various RL
VCM = 1.5V, RF = 0Ω, AV = +1
Frequency Response for Various CL
VCM = 1.5V, RL = 150Ω, AV = +1
16
17
23
43
+4
+2
0
+8
+4
0
CL= 100pF
CL= 47pF
RL= 10KΩ
RL= 520Ω
RL= 150Ω
CL= 22pF
CL= 0pF
-2
-4
-4
-8
1M
10M
FREQUENCY (Hz)
100M
1M
10M
100M
100M
145
FREQUENCY (Hz)
Frequency Response for Various RF and RG
VCM = 1.5V,RL = 150Ω, AV = +2
Group Delay vs. Frequency
18
10
8
RF = RG = 2KΩ
RF = RG = 1KΩ
AV = +2
RF = 1KΩ
+2
0
6
RF = RG = 560Ω
-2
-4
-6
4
AV = +1
RF = 0Ω
2
0
1M
10M
100M
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
Open Loop Gain and Phase vs. Frequency
Open Loop Voltage Gain vs. Die Temperature
29
0
80
70
60
50
40
30
80
60
40
20
0
RL = 1KΩ
No Load
45
Phase
90
RL = 150Ω
135
180
RL=150Ω
Gain
1K
100K
10M
-55
-15
25
65
105
FREQUENCY (Hz)
DIE TEMPERATURE (°C)
5
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Voltage Noise vs. Frequency
Closed Loop Output Impedance vs. Frequency
F = 0, AV = +1
65
26
200
R
10K
1K
20
2
100
10
1
0.2
10M
100M
10K
100K
1M
10
1K
100K
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
PSRR and CMRR vs. Frequency
Offset Voltage vs. Die Temperature
(6 Typical Samples)
28
+20
39
12
0
-20
-40
-60
-80
6
0
CMRR
-PSRR
+PSRR
-6
-12
-55
-15
25
65
105
145
1K
10K
100K
1M
10M
100M
FREQUENCY (Hz)
DIE TEMPERATURE (°C)
Output Voltage Swing vs. Frequency for THD < 1%
F = 1KΩ, AV = +2
Output Voltage Swing vs. Frequency for THD < 0.1%
RF = 1KΩ, AV = +2
21
22
R
5
4
3
2
1
0
5
4
3
2
1
0
RL = 500Ω to 2.5V
RL = 500Ω to 2.5V
RL = 150Ω to 2.5V
RL = 150Ω to 2.5V
1M
10M
FREQUENCY (Hz)
100M
1M
10M
100M
FREQUENCY (Hz)
6
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Large Signal Pulse Response (Single Supply)
VS= +5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2
Small Signal Pulse Response (Single Supply)
VS= +5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2
62
63
4
3
2
1
0
1.7
1.5
1.3
TIME (20ns/DIV)
TIME (20ns/DIV)
Large Signal Pulse Response (Split Supplies)
VS= ±2.5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2
Small Signal Pulse Response (Split Supply)
VS= ±2.5V, RL = 150Ω to 0V, RF = 1KΩ, AV = +2
61
64
+2
0
+0.2
0
-2
-0.2
TIME (20ns/DIV)
TIME (20ns/DIV)
Slew Rate vs. Die Temperature
Settling Time vs. Settling Accuracy
RL=1KΩ, RF = 500Ω, AV = -1, VSTEP = 3V
70
48
100
80
60
40
20
0
250
200
150
-55
-15
25
65
105
145
0.01
0.1
1.0
DIE TEMPERATURE (°C)
SETTLING ACCURACY (%)
7
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Differential Gain for RL Tied to 0V
RF = 0, AV = +1
Differential Phase for RL Tied to 0V
RF = 0, AV = +1
54
53
+0.08
+0.04
0
+0.2
+0.1
0
RL = 10KΩ
RL = 150Ω
RL = 150Ω
-0.04
-0.08
-0.1
-0.2
RL = 10KΩ
0.25
1.75
3.25
0.25
3.25
1.75
VOUT (V)
VOUT (V)
Differential Phase for RL Tied to 2.5V
RF = 0, AV = +1
Differential Gain for RL Tied to 2.5V
RF = 0, AV = +1
55
56
+0.2
+0.1
0
+0.2
+0.1
0
RL = 150Ω
RRLL ==10KΩ
RR ==150Ω
LL
-0.1
-.02
-0.1
-0.2
RL = 10KΩ
0.5
2.0
3.5
0.5
2.0
3.5
VOUT (V)
VOUT (V)
Differential Gain for RL Tied to 0V
RF = 1KΩ, AV = +2
Differential Phase for RL Tied to 0V
RF = 1KΩ, AV = +2
32
34
+0.2
+0.1
0
+0.2
+0.1
0
RL = 150Ω
RL = 10KΩ
RL = 150Ω
RL = 10KΩ
-0.1
-0.2
-0.1
-0.2
0.5
2.0
VOUT (V)
3.5
0.5
3.5
2.0
VOUT (V)
8
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Differential Phase for RL Tied to 2.5V
F = 1KΩ, AV = +2
Differential Gain for RL Tied to 2.5V
F = 1KΩ, AV = +2
33
31
R
R
+0.2
+0.2
RL = 10KΩ
+0.1
0
+0.1
0
RL = 150Ω
-0.1
-0.2
-0.1
-0.2
RL = 10KΩ
RL = 150Ω
0.5
2.0
3.5
0.5
2.0
3.5
VOUT (V)
VOUT (V)
2nd and 3rd Harmonic Distortion vs. Frequency
OUT = 0.25V to 2.25V, RL = 100Ω to 0V
2nd and 3rd Harmonic Distortion vs.Frequency
5
6
V
VOUT = 0.5V to 2.5V, RL = 100Ω to 0V
-25
-35
-45
-55
-65
-75
-25
-35
-45
-55
-65
-75
HD3
HD3
HD2
HD2
1M
10M
100M
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Channel to Channel Crosstalk- Duals and Quads
(Worst Channel)
2nd and 3rd Harmonic Distortion vs. Frequency
VOUT = 1V to 3V, RL = 100Ω to 0V
27
7
0
-25
-20
-40
-35
-45
-55
-65
-75
HD3
HD2
-60
-80
-100
100K
1M
10M
100M
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
9
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Supply Current (per Amp) vs.
Supply Voltage
Output Current vs. Die Temperature
L = 10Ω to 2.5V
44
45
120
R
8
6
4
2
0
100
80
60
40
20
Source
Sink
0
1
2
3
4
5
145
145
-55
-15
25
65
105
145
SUPPLY VOLTAGE (V)
DIE TEMPERATURE (°C)
Supply Current - OFF (per amp) vs.
Die Temperature
Supply Current - ON (per amp) vs.
Die Temperature
47
46
9
8
7
6
5
4
5
4
3
2
1
0
-55
-15
25
65
105
145
-55
-15
25
65
105
DIE TEMPERATURE (°C)
DIE TEMPERATURE (°C)
Negative Output Voltage Swing vs.
Die Temperature
Positive Output Voltage Swing vs. Die Temperature
69
41
RL = 150Ω
5.0
4.9
4.8
4.7
4.6
4.5
0.5
0.4
0.3
0.2
0.1
0
RL=150Ω to 2.5V
RL=150Ω to 2.5V
RL=150Ω to 0V
RL=150Ω to 0V
-55
-15
25
65
105
145
-55
-15
25
65
105
DIE TEMPERATURE (°C)
DIE TEMPERATURE (°C)
10
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Output Voltage from Either Rail vs. Die Temperature
for Various Effective RLOAD
OFF Isolation - EL5146C & EL5246C
71
-20
40
300
100
-40
-60
EL 5146CS & EL5146CN
Effective RLOAD = 150Ω
Effective RLOAD = 1KΩ
EL5246CN
EL5246CS
Effective RLOAD = 5KΩ
-80
10
1
-100
Effective RLOAD = RL//RF to V /2
S
-120
-55
-15
25
65
105
145
100
100
10k
100k
1M
10M
100M
DIE TEMPERATURE (°C)
FREQUENCY (Hz)
Maximum Power Dissipation vs. Ambient Temperature
Singles (TJMAX = 150°C)
Maximum Power Dissipation vs. Ambient Temperature
Duals (TJMAX = 150°C)
67
66
2.0
1.6
1.2
0.8
0.4
0
2.5
PDIP-14, ΘJA = 87°C/W
PDIP-8, ΘJA = 107°C/W
SOIC-14, ΘJA = 120°C/W
PDIP, ΘJA = 110°C/W
SOIC, ΘJA = 161°C/W
2.0
1.5
1.0
0.5
0
SOIC-8, ΘJA = 159°C/W
SOT23-5, ΘJA = 256°C/W
MSOP-8,10, ΘJA = 206°C/W
-50
-20
10
40
70
-50
-20
10
40
70
100
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
Maximum Power Dissipation vs. Ambient Temperature
Quads (TJMAX = 150°C)
68
2.5
2.0
1.5
1.0
0.5
0
PDIP-14, ΘJA = 83°C/W
SOIC-14, ΘJA = 118°C/W
QSOP-16, ΘJA = 158°C/W
-50
-20
10
40
70
AMBIENT TEMPERATURE (°C)
11
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Configurations
SOIC-14, PDIP-14
1
2
3
4
5
6
7
14
13
12
11
10
9
INA-
OUTA
NC
INA+
NC
MSOP-10
SOIC-8, PDIP-8, MSOP-8
-
INA+
CEA
GND
CEB
INB+
1
2
3
4
5
10 INA-
+
OUTA
INA-
1
2
3
4
8
7
6
5
V
S
-
CEA
GND
CEB
NC
9
8
7
6
OUTA
+
-
OUTB
INB-
+
V
S
V
S
INA+
+
-
-
NC
OUTB
INB-
INB+
+
GND
+
-
OUTB
INB-
EL5244C
EL5246C
8
INB+
EL5246C
QSOP-16
SOIC-14, PDIP-14
1
2
3
4
5
6
7
8
16
15
OUTD
IND-
OUTA
OUTA
1
14 OUTD
INA-
INA-
2
3
4
5
6
7
13
12
11
10
9
IND-
14 IND+
13 GND
INA+
INA+
IND+
GND
INC+
INC-
V
S
V
S
V
S
12
11
GND
INC+
INB+
INB-
INB+
INB-
10 INC-
OUTC
OUTB
8
OUTC
OUTB
9
EL5444C
EL5444C
Single Amplifier Pin Configurations on Page 1
12
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Description
Name
VS
Function
Positive Power Supply
Equivalent Circuit
5
2
3
7
4
3
8
4
8
3
11
4
4
4,5
11
12,13
GND
IN+
Ground or Negative Power Supply
Noninverting Input
V
S
GND
Circuit 1
4
1
2
6
IN-
Inverting Input
(Reference Circuit 1)
OUT
Amplifier Output
V
S
GND
Circuit 2
3
2
1
5
6
7
1
10
9
1
14
13
7
3
2
3
2
INA
+
Amplifier A Noninverting Input
Amplifier A Inverting Input
Amplifier A Output
(Reference Circuit 1)
(Reference Circuit 1)
(Reference Circuit 2)
(Reference Circuit 1)
(Reference Circuit 1)
(Reference Circuit 2)
(Reference Circuit 1)
(Reference Circuit 1)
(Reference Circuit 2)
(Reference Circuit 1)
(Reference Circuit 1)
(Reference Circuit 2)
INA
-
1
1
OUTA
INB+
INB-
5
5
6
Amplifier B Noninverting Input
Amplifier B Inverting Input
Amplifier B Output
6
8
6
7
7
9
7
8
OUTB
INC+
INC-
10
9
11
10
9
Amplifier C Noninverting Input
Amplifier C Inverting Input
Amplifier C Output
8
OUTC
12
13
14
14
15
16
IND
IND
OUTD
+
Amplifier D Noninverting Input
Amplifier D Inverting Input
Amplifier D Output
-
13
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Pin Description
Name
Function
Equivalent Circuit
8
CE
Enable (Enabled when high)
V
S
+
–
1.4V
GND
Circuit 3
Enable Amplifier A (Enabled when high) (Reference Circuit 3)
2
4
3
5
CEA
CEB
NC
Enable Amplifier B (Enabled when high)
No Connect. Not internally connected.
(Reference Circuit 3)
1,5
2,6,
10,12
14
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Description of Operation and Applications Information
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 becomes the negative supply rail.
Product Description
The EL5144C series is a family of wide bandwidth, sin-
gle supply, low power, rail-to-rail output, voltage
feedback operational amplifiers. The family includes
single, dual, and quad configurations. The singles and
duals are available with a power down pin to reduce
power to 2.6µA typically. All the amplifiers are inter-
nally compensated for closed loop feedback gains of +1
or greater. Larger gains are acceptable but bandwidth
will be reduced according to the familiar Gain-Band-
width Product.
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-
mised performance.
Connected in voltage follower mode and driving a high
impedance load, the EL5144C series has a -3dB band-
width of 100 MHz. Driving a 150Ω load, they have a
-3dB bandwidth of 60 MHz while maintaining a 200
V/µS slew rate. The input common mode voltage range
includes ground while the output can swing rail to rail.
Input, Output, and Supply Voltage Range
The EL5144C series has been designed to operate with a
single supply voltage of 5V. Split supplies can 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.
Power Supply Bypassing 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
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 with an effective 150 Ω load resistor
connected to a voltage halfway between the supply rails,
the output will swing to within 150mV of either rail.
15
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
Figure 1 shows the output of the EL5144C series ampli-
fier swinging rail to rail with RF = 1KΩ, AV = +2 and RL
= 1MΩ. Figure 2 is with RL = 150 Ω.
+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 300 Ω and 15K Ω.
5V
Video Performance
For good video signal integrity, an amplifier is required
to maintain the same output impedance and the same fre-
quency response as 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 current 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 KΩ tied both to ground as well as 2.5V. As with
all video amplifiers, there is a common mode sweet spot
for optimum differential gain / differential phase. For
example, with AV = +2 and RL = 150Ω tied to 2.5V, and
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
0V
Figure 1
5V
0V
terminated 75Ω coaxial cable. With AV = +1, RL
=
150Ω tied to ground, and the video level kept between
0.85V and 2.95V, these amplifiers provide dG/dP per-
formance of 0.05% / 0.20°. This condition is
representative of using the EL5144C series amplifier as
a buffer driving a DC coupled, double terminated, 75Ω
coaxial cable. Driving high impedance loads, such as
signals on computer video cards, gives similar or better
dG/dP performance as driving cables.
Figure 2
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 ringing in the time domain and peaking in the 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.
Driving Cables and Capacitive Loads
The EL5144C series amplifiers can drive 50pF loads in
parallel with 150 Ω with 4dB of peaking and 100pF with
7dB of peaking. If less peaking is desired in these appli-
cations, a small series resistor (usually between 5 Ω and
50 Ω) can be placed in series with the output to eliminate
most peaking. However, this will obviously reduce the
gain slightly. If your gain is greater than 1, the gain
resistor (RG) can then be chosen to make up for any gain
As far as the output stage of the amplifier is concerned,
RF + RG appear in parallel with RL for gains other than
16
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
loss which may be created by this additional resistor at
Power Dissipation
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.
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 the amplifier to remain in
the safe operating area.
When used as a cable driver, double termination is
always recommended for reflection-free performance.
For those applications, the back-termination series resis-
tor will de-couple the EL5144C series amplifier from the
cable and allow extensive capacitive drive. However,
other applications may have high capacitive loads with-
out a back-termination resistor. Again, a small series
resistor at the output can reduce peaking.
The maximum power dissipation allowed in a package is
determined according to:
T
– T
AMAX
Disable / Power-Down
JMAX
PD
= ---------------------------------------------
MAX
Θ
JA
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 disabled, the amplifier’s supply current is reduced
to 2.6µA typically, thereby effectively eliminating
power consumption. The amplifier’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 that don’t have a
power down feature.
where:
TJMAX = Maximum Junction Temperature
TAMAX = Maximum Ambient Temperature
θJA = Thermal Resistance of the Package
PDMAX = Maximum Power Dissipation
in the Package.
The maximum power dissipation actually produced by
an IC is the total quiescent supply current times the total
power supply voltage, plus the power in the IC due to the
load, or:
Short Circuit Current Limit
The EL5144C series amplifiers do not have internal
short circuit protection circuitry. Short circuit current of
90 mA sourcing and 65 mA sinking typically 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 dissipation could easily increase such
that the part will be destroyed. Maximum reliability is
maintained if the output current 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.
V
OUT
PD
= N •
V
• I
+ (V – V
) • ---------------
MAX
S
SMAX
S
OUT
R
L
where:
N = Number of amplifiers in the package
VS = Total Supply Voltage
17
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
ISMAX = Maximum Supply Current Per Amplifier
VOUT = Maximum Output Voltage of the Application
RL = Load Resistance tied to Ground
ure 4 is a graph of propagation delay vs. overdrive as a
square wave is presented at the input of the comparator.
+5V
1
2
3
4
8
7
6
5
EL5146C
0.1µF
+
–
-
V
If we set the two PDMAX equations equal to each other,
we can solve for RL:
IN
V
OUT
+
+2.5V
RL
Figure 3
V
• (V – V )
OUT
OUT
S
R = ----------------------------------------------------------------------------------------------
L
T
– T
AMAX
JMAX
--------------------------------------------- – (V • I
)
SMAX
S
N • Θ
Propagation Delay vs. Overdrive for Amplifier Used as a
Comparator
JA
8
1000
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.
Negative Going Signal
100
Part
Package
SOT23-5
SOIC-8
Minimum RL
37
21
14
48
30
69
69
34
23
139
85
51
EL5144CW
EL5146CS
EL5146CN
EL5244CS
EL5244CN
EL5244CY
EL5246CY
EL5246CS
EL5246CN
EL5444CU
EL5444CS
EL5444CN
Positive Going Signal
PDIP-8
10
SOIC-8
0.01
0.1
1.0
OVERDRIVE (V)
PDIP-8
MSOP-8
MSOP-10
SOIC-14
PDIP-14
QSOP-16
SOIC-14
PDIP-14
Figure 4
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 applications. 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 decays to
EL5144C Series Comparator Application
The EL5144C series amplifier can be used as a very fast,
single supply comparator. 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-
18
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
ground with an RLCL time constants. 500 nsec later,
Free Running Oscillator Application
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.
Figure 7 is an EL5144C configured as a free running
oscillator. To first order, ROSC and COSC determine the
frequency of oscillation according to:
0.72
V
3V
10MHz
IN 1
PP
F
= -----------------------------------
OSC
R
• C
1
2
3
4
5
6
7
14
13
12
11
10
9
OSC
OSC
V
OUT
-
+
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, COSC = 240 pF and
FOSC = 6 MHz.
EL5246C
+5V
Select
4.7µF
0.1µF
+
-
150Ω
VIN
2.4V
5MHz
2
PP
8
470K
+5V
Figure 5
1
2
3
5
4
470K
470K
0.1µF
ROSC
5V
COSC
VOUT
Figure 7
0V
5V
0V
Select
5V
Figure 6
V
OUT
0V
Figure 8
19
EL5144C, EL5146C, EL5244C, EL5246C,
EL5444C
100 MHz Single Supply Rail to Rail Amplifier
General Disclaimer
Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the cir-
cuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described
herein and makes no representations that they are free from patent infringement.
WARNING - Life Support Policy
Elantec, Inc. products are not authorized for and should not be used
Elantec Semiconductor, Inc.
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment 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 personal injury or death. Users con-
templating application of Elantec, Inc. Products in Life 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
components and does not cover injury to persons or property or
other consequential damages.
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20
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