EL5156IS-T7 [INTERSIL]
1mV Voltage Offset, 600MHz Amplifiers; 1mV的偏置电压， 600MHz的放大器
| 型号： | EL5156IS-T7 |
| 厂家： | 
Intersil |
| 描述： | 1mV Voltage Offset, 600MHz Amplifiers |
| 文件： | 总12页 (文件大小：350K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EL5156, EL5157, EL5256, EL5257
®
Data Sheet
July 2, 2004
FN7386.2
PRELIMINARY
<1mV Voltage Offset, 600MHz Amplifiers
Features
The EL5156, EL5157, EL5256, and
EL5257 are 600MHz bandwidth -3dB
• 600MHz -3dB bandwidth, 240MHz 0.1dB bandwidth
• 700V/µs slew rate
voltage mode feedback amplifiers with
• <1mV input offset
DC accuracy of <0.01%, 1mV offsets and 40kV/V open loop
gains. These amplifiers are ideally suited for applications
ranging from precision measurement instrumentation to high
speed video and monitor applications demanding the very
highest linearity at very high frequency. Capable of operating
with as little as 6.0mA of current from a single supply ranging
from 5V to 12V and dual supplies ranging from ±2.5V to
±5.0V these amplifiers are also well suited for handheld,
portable and battery-powered equipment. With their
capability to output as much as 140mA, member of this
family is comfortable with demanding load conditions.
• Very high open loop gains 92dB
• Low supply current = 6mA
• 140mA output current
• Single supplies from 5V to 12V
• Dual supplies from ±2.5V to ±5V
• Fast disable on the EL5156 and EL5256
• Low cost
Single amplifiers are available in SOT-23 packages and
duals in a 10-pin MSOP package for applications where
board space is critical. Additionally, singles and duals are
available in the industry-standard 8-pin SO package. All
parts operate over the industrial temperature range of -40°C
to +85°C.
Applications
• Imaging
• Instrumentation
• Video
• Communications devices
Ordering Information
PART
NUMBER
PACKAGE
8-Pin SO
TAPE & REEL PKG. DWG. #
EL5156IS
-
MDP0027
MDP0027
MDP0027
MDP0038
MDP0038
MDP0043
MDP0043
MDP0043
MDP0027
MDP0027
MDP0027
MDP0043
MDP0043
MDP0043
EL5156IS-T7
EL5156IS-T13
EL5157IW-T7
8-Pin SO
7”
8-Pin SO
13”
5-Pin SOT-23
7” (3K pcs)
EL5157IW-T7A 5-Pin SOT-23
7” (250 pcs)
EL5256IY
10-Pin MSOP
10-Pin MSOP
10-Pin MSOP
8-Pin SO
-
7”
13”
-
EL5256IY-T7
EL5256IY-T13
EL5257IS
EL5257IS-T7
EL5257IS-T13
EL5257IY
8-Pin SO
7”
13”
-
8-Pin SO
8-Pin MSOP
8-Pin MSOP
8-Pin MSOP
EL5257IY-T7
EL5257IY-T13
7”
13”
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL5156, EL5157, EL5256, EL5257
Pinouts
EL5156
EL5157
(5-PIN SOT-23)
TOP VIEW
(8-PIN SO)
TOP VIEW
NC
IN-
1
2
3
4
8
7
6
5
CE
OUT
VS-
IN+
1
2
3
5
4
VS+
IN-
VS+
OUT
NC
-
+
+
-
IN+
VS-
EL5256
(10-PIN MSOP)
TOP VIEW
EL5257
(8-PIN SO)
TOP VIEW
INA+
CEA
VS-
INA-
OUTA
INA-
INA+
VS-
1
2
3
4
5
10
9
1
2
3
4
8
7
6
5
VS+
-
OUTA
VS+
-
+
OUTB
INB-
+
8
-
+
+
-
OUTB
INB-
CEB
INB+
7
INB+
6
2
EL5156, EL5157, EL5256, EL5257
Absolute Maximum Ratings (T = 25°C)
A
Supply Voltage between V and GND. . . . . . . . . . . . . . . . . . . 13.2V
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Ambient Operating Temperature . . . . . . . . . . . . . . . .-40°C to +85°C
S
Maximum Continuous Output Current . . . . . . . . . . . . . . . . . . . 50mA
Pin Voltages. . . . . . . . . . . . . . . . . . . . . . . . . GND -0.5V to V +0.5V
S
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Current into I +, I -, CE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
N N
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests
are at the specified temperature and are pulsed tests, therefore: T = T = T
A
J
C
Electrical Specifications V + = +5V, V - = -5V, CE = +5V, R = R = 562Ω, R = 150Ω, T = 25°C, unless otherwise specified.
S
S
F
G
L
A
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
AC PERFORMANCE
BW
-3dB Bandwidth
A
= +1, R = 500Ω, C = 4.7pF
600
180
210
70
MHz
MHz
MHz
MHz
V/µs
V/µs
ns
V
L
L
A
= +2, R = 150Ω
V
L
GBWP
BW1
SR
Gain Bandwidth Product
0.1dB Bandwidth
Slew Rate
R
= 150Ω
L
A
= +2
V
V
= -3.2V to +3.2V, A = +2, R = 150Ω
500
640
700
15
O
O
V
L
V
= -3.2V to +3.2V, A = +1, R = 500Ω
V
L
t
0.1% Settling Time
A = +1
V
S
dG
dP
Differential Gain Error
A
= +2, R = 150Ω
0.005
0.04
12
%
V
L
Differential Phase Error
Input Referred Voltage Noise
Input Referred Current Noise
A
= +2, R = 150Ω
°
V
L
V
nV/√Hz
pA/√Hz
N
I
5.5
N
DC PERFORMANCE
Offset Voltage
V
-1
0.5
-3
1
mV
OS
T V
Input Offset Voltage Temperature
Coefficient
Measured from T
MIN
to T
MAX
µV/°C
C
OS
A
Open Loop Gain
V
is from -2.5V to 2.5V
O
10
40
kV/V
VOL
INPUT CHARACTERISTICS
CMIR
Common Mode Input Range
Guaranteed by CMRR test
= 2.5V to -2.5V
-2.5
80
+2.5
V
CMRR
Common Mode Rejection Ratio
Input Bias Current
V
108
-0.4
-200
100
25
dB
µA
nA
nA
MΩ
pF
CM
I
EL5156 & EL5157
EL5256 & EL5257
-1
+1
B
-600
-250
10
+600
+250
I
Input Offset Current
Input Resistance
Input Capacitance
OS
R
IN
IN
C
1
OUTPUT CHARACTERISTICS
V
Output Voltage Swing
R
R
R
= 150Ω to GND
= 500Ω to GND
= 10Ω to GND
±3.4
±3.6
±80
±3.6
±3.8
±140
V
V
OUT
L
L
L
I
Peak Output Current
mA
OUT
ENABLE (EL5156 and EL5256 ONLY)
t
t
Enable Time
Disable Time
200
300
ns
ns
EN
DIS
3
EL5156, EL5157, EL5256, EL5257
Electrical Specifications V + = +5V, V - = -5V, CE = +5V, R = R = 562Ω, R = 150Ω, T = 25°C, unless otherwise specified.
S
S
F
G
L
A
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
µA
µA
V
I
I
CE Pin Input High Current
CE Pin Input Low Current
CE = V +
S
0
-1
IHCE
ILCE
CE = V -
5
13
25
S
V
V
CE Input High Voltage for Power-down
CE Input Low Voltage for Power-up
V + -1
S
IHCE
ILCE
V + -3
S
V
SUPPLY
I
I
Supply Current - Enabled (per amplifier) No load, V = 0V, CE = +5V
IN
5.1
5
6.0
13
90
6.9
25
mA
µA
dB
SON
Supply Current - Disabled (per amplifier) No load, V = 0V, CE = 5V
IN
SOFF
PSRR
Power Supply Rejection Ratio
DC, V = ±3.0V to ±6.0V
75
S
Typical Performance Curves
4
3
135
90
45
R =150Ω
R =150Ω
L
L
C =4.7pF
C =4.7pF
L
L
2
1
A =+1
V
A =+2
V
0
A =+2
V
0
-45
A =+5
V
-1
-90
A =+10
-2
-3
-135
-180
-225
-270
-315
V
A =+10
V
A =+5
V
-4
-5
-6
100K
1M
10M
FREQUENCY (Hz)
100M
1G
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 1. SMALL SIGNAL FREQUENCY RESPONSE - GAIN
FIGURE 2. SMALL SIGNAL FREQUENCY RESPONSE -
PHASE FOR VARIOUS GAINS
5
4
4
A =+1
V
V =±5V
C =27pF
L
S
3
R =500Ω
L
A =+2
V
3
2
2
1
0
-1
-2
-3
-4
-5
R =R =562Ω
F G
C =10pF
L
R =500Ω
L
C =4.7pF
L
1
0
R =150Ω
L
-1
-2
R =750Ω
L
C =1pF
L
R =50Ω
-3
-4
L
-5
-6
100K
1M
10M
FREQUENCY (Hz)
100M
1G
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 3. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS R
FIGURE 4. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS C
L
L
4
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
5
4
3
2
1
16
14
12
10
8
A =+2
V
A =+2
V
180pF
100pF
33pF
R =500Ω
L
R =R =562Ω
F
G
22pF
10pF
8.2pF
4.7pF
R =R =500Ω
F
G
R =150Ω
L
0
6
10pF
0pF
-1
-2
-3
-4
4
2
0
0pF
-2
-5
-4
100K
1M
10M
100M
1G
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 5. SMALL SIGNAL FREQUENCY RESPONSE FOR
FIGURE 6. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS C
L
VARIOUS C
L
5
5
4
3
2
A =+5
V
R =500Ω
L
4
R =500Ω
C =4.7pF
L
L
3
2
1
0
A =+1
V
100pF
82pF
68pF
22pF
±2.0V
1
0
-1
±3.0V
±4.0V
±5.0V
-1
-2
-3
-4
-2
-3
-4
-5
100M
100K
1M
10M
FREQUENCY (Hz)
500M
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 8. FREQUENCY RESPONSE vs POWER SUPPLY
FIGURE 7. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS C
L
4
3
2
1
0
5
4
3
2
1
V =±5V
S
R =620Ω
F
A =+1
V
R =150Ω
L
A =-1
V
-1
-2
-3
-4
-5
-6
0
-1
-2
-3
-4
A =-2
A =+2
V
V
A =+1
V
R =500Ω
L
A =+5
V
C =4.7pF
L
-5
100K
1M
10M
FREQUENCY (Hz)
100M
1G
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 10. SMALL SIGNAL INVERTING FREQUENCY
RESPONSE FOR VARIOUS GAINS
FIGURE 9. EL5256 SMALL SIGNAL FREQUENCY
RESPONSE FOR VARIOUS GAINS
5
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
5
4
3
4
3
A =+1
V
A =+1
V
C =0.2pF
L
C =4.7pF
L
500Ω
R =500Ω
2
1
L
R =300Ω
2
L
1
0
-1
0
R =150Ω
-1
-2
-3
-4
-5
-2
-3
L
200Ω
100Ω
50Ω
-4
-5
-6
100K
1M
10M
FREQUENCY (Hz)
100M
1G
100K
1M
10M
FREQUENCY (Hz)
100M
1G
FIGURE 12. EL5256 SMALL SIGNAL FREQUENCY
FIGURE 11. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS R
L
RESPONSE FOR VARIOUS R
L
5
4
3
4
3
A =+5
V
A =+2
V
68pF
47pF
C =4.7pF
L
R =500Ω
12pF
L
R =500Ω
C =4.7pF
L
L
8.2pF
2
1
R =102Ω
R =500Ω
F
F
2
1
0
-1
-2
-3
4.7pF
0
-1
-2
-3
-4
-5
0.2pF
0pF
22pF
4.7pF
0pF
-4
-5
100K
1M
10M
100M 200M
100K
1M
10M
100M 200M
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 13. SMALL SIGNAL FREQUENCY RESPONSE FOR
FIGURE 14. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS C
VARIOUS C
IN
IN
6
5
4
4
3
R =R =3kΩ
F
G
A =+2
V
V =±5V
S
C =4.7pF
L
A =+2
V
R =R =1kΩ
F
G
2
1
R =500Ω
R =150Ω
L
2kΩ
L
C =4.7pF
L
3
2
1
0
-1
1kΩ
350Ω
500Ω
200Ω
562Ω
500Ω
250Ω
0
-2
-3
-1
-2
-3
-4
-4
-5
-6
100K
1M
10M
FREQUENCY (Hz)
100M
1G
100K
1M
10M
FREQUENCY (Hz)
100M
1G
FIGURE 16. EL5256 SMALL SIGNAL FREQUENCY
RESPONSE FOR VARIOUS R /R
FIGURE 15. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS R AND R
F
G
F
G
6
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
5
5
4
3
2
1
A =+2
CHANNEL #1
CHANNEL #2
V
4
3
2
1
0
R =200Ω
L
C =4.7pF
L
-20dBm
10dBm
0
-1
-2
-3
-4
-1
-2
-3
-4
-5
15dBm
17dBm
A =+1
V
R =500Ω
L
20dBm
C =4.7pF
L
-5
100M
100K
1M
10M
600M
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FIGURE 17. LARGE SIGNAL FREQUENCY RESPONSE FOR
VARIOUS INPUT AMPLITUDES
FIGURE 18. CHANNEL TO CHANNEL FREQUENCY
RESPONSE
0
-10
700
A =+1,R =500Ω, C =5pF
A =+5
V
L
L
V
R =500Ω
600
500
400
300
200
L
-20 C =4.7pF
L
-30
-40
-50
-60
-70
-80
-90
A =+1, R =150Ω
V
L
A =+2,R =150Ω
V
L
100
0
-100
4.5
5.5
6.5
7.5
V
8.5
(V)
9.5 10.5 11.5
100K
1M
10M
100M
1G
S
FREQUENCY (Hz)
FIGURE 20. BANDWIDTH vs SUPPLY VOLTAGE
FIGURE 19. EL5256 CROSS TALK vs FREQUENCY CHANNEL
A TO B & B TO A
4
3
2
1K
A =+5
V
C =4.7pF
L
1
0
100
500Ω
1000Ω
-1
-2
-3
-4
-5
-6
V
N
10
100Ω
50Ω
I
N
1
10
10K
FREQUENCY (Hz)
100
1K
100K
1M
10M
100K
1M
10M
100M
1G
FREQUENCY (Hz)
FIGURE 21. SMALL SIGNAL FREQUENCY RESPONSE FOR
VARIOUS R
FIGURE 22. VOLTAGE AND CURRENT NOISE vs FREQUENCY
L
7
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
-20
1000
100
10
-30
-40
-50
-60
-70
A =+2
V
R =0Ω
L
R
=R =400Ω
G
F
1
-80
-90
-100
-110
0.01
0.001
1M
10M
100
1K
10K
100K
100M
1M
100K
FREQUENCY (Hz)
1K
10K
10M
100M
FREQUENCY (Hz)
FIGURE 23. CMRR
FIGURE 24. OUTPUT IMPEDANCE
-10
6.1
6
V =±5V
S
-20
-30
-40
-50
-60
-70
-80
-90
A =+2
V
R =150Ω
L
5.9
5.8
5.7
I -
S
I +
S
5.6
5.5
-100
-110
5.4
5.3
100K
1M
10M
100M
1G
4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 1010.51111.5 12
(V)
FREQUENCY (Hz)
V
S
FIGURE 25. INPUT TO OUTPUT ISOLATION vs FREQUENCY -
DISABLE
FIGURE 26. SUPPLY CURRENT vs SUPPLY VOLTAGE
0.8
A =+2
V
A =+1
V
0.7
R =500Ω
L
R =500Ω
L
SUPPLY=±5.0V
±12.3mA
0.6
0.5
C =5pF
L
0.4
0.3
0.2
0.1
0
ENABLE
192ns
DISABLE
322ns
4.5
5.5
6.5
7.5
V
8.5
(V)
9.5 10.5 11.5
TIME (400ns/DIV)
S
FIGURE 27. ENABLE/DISABLE RESPONSE
FIGURE 28. PEAKING vs SUPPLY VOLTAGE
8
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
A =+2
V
R =500Ω
L
SUPPLY=±5.0V ±12.3mA
OUTPUT=200mV
P-P
0
0
FALL
RISE
80%-20%
∆T=1.91ns
20%-80%
∆T=2.025ns
A =+2
V
R =500Ω
L
SUPPLY=±5.0V ±12.3mA
OUTPUT=200mV
P-P
TIME (4ns/DIV)
TIME (4ns/DIV)
FIGURE 30. SMALL SIGNAL FALL TIME
FIGURE 29. SMALL SIGNAL RISE TIME
A =+2
V
A =+2
V
R =500Ω
L
R =500Ω
SUPPLY=±5.0V ±12.3mA
L
SUPPLY=±5.0V ±12.3mA
OUTPUT=2.0V
P-P
OUTPUT=2.0V
P-P
0
FALL
0
80%-20%
∆T=1.7ns
RISE
20%-80%
∆T=1.657ns
TIME (2ns/DIV)
TIME (2ns/DIV)
FIGURE 32. LARGE SIGNAL FALL TIME
FIGURE 31. LARGE SIGNAL RISE TIME
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
1.8
1.6
1.4
1.2
1
1.2
1
781mW
488mW
1.136W
543mW
0.8
0.6
0.4
0.2
0
SO8
SO8
θ
=110°C/W
θ
=160°C/W
JA
JA
0.8
0.6
0.4
0.2
0
SOT23-5
SOT23-5
θ
=256°C/W
JA
θ
=230°C/W
JA
0
25
50
75 85 100
125
150
0
25
50
75 85 100
125
150
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
FIGURE 34. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 33. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
9
EL5156, EL5157, EL5256, EL5257
Typical Performance Curves (Continued)
JEDEC JESD51-3 LOW EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
JEDEC JESD51-7 HIGH EFFECTIVE THERMAL
CONDUCTIVITY TEST BOARD
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
870mW
486mW
MSOP8/10
MSOP8/10
θ
=206°C/W
JA
θ
=115°C/W
JA
0
25
50
75 85 100
125
0
25
50
75 85 100
125
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
FIGURE 35. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
FIGURE 36. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
10
EL5156, EL5157, EL5256, EL5257
and 0.04%, while driving 150Ω at a gain of 2. Driving high
impedance loads would give a similar or better dG and dP
performance.
Product Description
The EL5156, EL5157, EL5256, and EL5257 are wide
bandwidth, single or dual supply, low power and low offset
voltage feedback operational amplifiers. Both amplifiers are
internally compensated for closed loop gain of +1 or greater.
Connected in voltage follower mode and driving a 500Ω
load, the -3dB bandwidth is about 610MHz. Driving a 150Ω
load and a gain of 2, the bandwidth is about 180MHz while
maintaining a 600V/µs slew rate. The EL5156 and EL5256
are available with a power down pin to reduce power to
17µA typically while the amplifier is disabled.
Driving Capacitive Loads and Cables
The EL5156 and EL5157 families can drive 27pF loads in
parallel with 500Ω with less than 5dB of peaking at gain of
+1. If less peaking is desired in applications, a small series
resistor (usually between 5Ω to 50Ω) can be placed in series
with the output to eliminate most peaking. However, this will
reduce the gain slightly. If the gain setting is greater than 1,
the gain resistor RG can then be chosen to make up for any
gain loss which may be created by the additional series
resistor at the output.
Input, Output and Supply Voltage Range
The EL5156 and EL5157 families have been designed to
operate with supply voltage from 5V to 12V. That means for
single supply application, the supply voltage is from 5V to
12V. For split supplies application, the supply voltage is from
±2.5V to ±5V. The amplifiers have an input common mode
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor at the
amplifier's output will isolate the amplifier from the cable and
allow extensive capacitive drive. However, other applications
may have high capacitive loads without a back-termination
resistor. Again, a small series resistor at the output can help
to reduce peaking.
voltage range from 1.5V above the negative supply (V - pin)
S
to 1.5V below the positive supply (V + pin). If the input
S
signal is outside the above specified range, it will cause the
output signal distorted.
The outputs of the EL5156 and EL5157 families can swing
Disable/Power-Down
from -4V to 4V for V = ±5V. As the load resistance becomes
S
The EL5156 and EL5256 can be disabled and their output
placed in a high impedance state. The turn off time is about
330ns and the turn on time is about 130ns. When disabled,
the amplifier's supply current is reduced to 17µA typically,
thereby effectively eliminating the power consumption. The
amplifier's power down can be controlled by standard TTL or
CMOS signal levels at the ENABLE pin. The applied logic
lower, the output swing is lower. If the load resistor is 500Ω,
the output swing is about -4V at a 4V supply. If the load
resistor is 150Ω, the output swing is from -3.5V to 3.5V.
Choice of Feedback Resistor and Gain Bandwidth
Product
For applications that require a gain of +1, no feedback
resistor is required. Just short the output pin to the inverting
input pin. For gains greater than +1, the feedback resistor
forms a pole with the parasitic capacitance at the inverting
input. As this pole becomes smaller, the amplifier's phase
margin is reduced. This causes ringing in the time domain
and peaking in the frequency domain. Therefore, RF can't be
very big for optimum performance. If a large value of RF
must be used, a small capacitor in the few Pico farad range
in parallel with RF can help to reduce the ringing and
peaking at the expense of reducing the bandwidth.
signal is relative to V - pin. Letting the ENABLE pin float or
S
applying a signal that is less than 0.8V above V - will enable
S
the amplifier. The amplifier will be disabled when the signal
at ENABLE pin is above V + -1.5V.
S
Output Drive Capability
The EL5156 and EL5157 families do not have internal short
circuit protection circuitry. They have a typical short circuit
current of 95mA and 70mA. If the output is shorted
indefinitely, the power dissipation could easily overheat the
die or the current could eventually compromise metal
integrity. Maximum reliability is maintained if the output
current never exceeds ±40mA. This limit is set by the design
of the internal metal interconnect. Note that in transient
applications, the part is robust.
For gain of +1, RF = 0 is optimum. For the gains other than
+1, optimum response is obtained with RF between 500Ω to
750Ω.
The EL5156 and EL5157 families have a gain bandwidth
product of 210MHz. For gains > = 5, its bandwidth can be
predicted by the following equation: (Gain)X(BW) = 210MHz.
Power Dissipation
With the high output drive capability of the EL5156 and
EL5157 families, it is possible to exceed the 125°C absolute
maximum junction temperature under certain load current
conditions. Therefore, it is important to calculate the
maximum junction temperature for the application to
determine if the load conditions or package types need to be
modified for the amplifier to remain in the safe operating
area.
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150Ω, because of the change in output current with DC
level. The dG and dP for these families are about 0.006%
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EL5156, EL5157, EL5256, EL5257
The maximum power dissipation allowed in a package is
determined according to:
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, a good printed circuit
board layout is necessary for optimum performance. Lead
lengths should be as sort as possible. The power supply pin
must be well bypassed to reduce the risk of oscillation. For
T
– T
AMAX
JMAX
PD
= --------------------------------------------
MAX
Θ
JA
Where:
normal single supply operation, where the V - pin is
S
T
T
= Maximum junction temperature
= Maximum ambient temperature
= Thermal resistance of the package
JMAX
connected to the ground plane, a single 4.7µF tantalum
capacitor in parallel with a 0.1µF ceramic capacitor from V +
AMAX
S
to GND will suffice. This same capacitor combination should
be placed at each supply pin to ground if split supplies are to
θ
JA
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:
be used. In this case, the V - pin becomes the negative
S
supply rail.
For good AC performance, parasitic capacitance should be
kept to minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
For sourcing:
n
V
OUTi
R
Li
-----------------
PD
= V × I
+
(V – V
) ×
MAX
S
SMAX
S
OUTi
∑
i = 1
For sinking:
n
PD
= V × I
+
(V
– V ) × I
OUTi S LOADi
MAX
S
SMAX
∑
i = 1
Where:
V = Supply voltage
S
IS
V
= Maximum quiescent supply current
= Maximum output voltage of the application
MAX
OUT
R
I
= Load resistance tied to ground
LOAD
= Load current
LOAD
N = number of amplifiers (Max = 2)
By setting the two PD equations equal to each other, we
MAX
can solve the output current and R
overheat.
to avoid the device
LOAD
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
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