®
EL2120
Data Sheet
January 1996, Rev E
FN7044
100MHz Current Feedback Amplifier
The EL2120 is a wideband current
feedback amplifier optimized for video
performance. Its 0.01% differential
gain and 0.03 degree differential phase performance when
at ±5V supplies exceeds the performance of other amplifiers
running on ±15V supplies. Operating on ±8 to ±15V supplies
reduces distortions to 0.01% and 0.01 degrees and below.
The EL2120 can operate with supplies as low as ±2.5V or a
single +5V supply.
Being a current feedback design, bandwidth is a relatively
constant 100MHz over the ±1 to ±10 gain range. The
EL2120 has been optimized for flat gain over frequency and
all characteristics are maintained at positive unity gain.
Because the input slew rate is similar to the 700V/µs output
slew rate the part makes an excellent high-speed buffer.
The EL2120 has a superior output disable function. Time to
enable or disable is 50ns and does not change markedly
with temperature. Furthermore, in disable mode the output
does not draw excessive currents when driven with
1000V/µs slew rates. The output appears as a 3pF load
when disabled.
Features
• Excellent differential gain and phase on ±5V to ±15V
supplies
• 100MHz -3dB bandwidth from gains of ±1 to ±10
• 700V/µs slew rate
• 0.1dB flatness to 20MHz
• Output disable in 50ns - remains high impedance even
when driven with large slew rates
• Single +5V supply operation
• AC characteristics are lot and temperature stable
• Available in small SO-8 package
Applications
• Video gain block
• Residue amplifier
• Multiplexer
• Current to voltage converter
• Coax cable driver with gain of 2
• ADC driver
Simplified Schematic
Ordering Information
PART
NUMBER
EL2120CN
EL2120CS
TEMP. RANGE
0°C to +75°C
0°C to +75°C
PACKAGE
8-Pin PDIP
8-Pin SO
PKG. NO.
MDP0031
MDP0027
Pinouts
EL2120
(8-PIN PDIP)
TOP VIEW
EL2120
(8-PIN SO)
TOP VIEW
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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EL2120
Absolute Maximum Ratings
(T
A
= 25°C)
Voltage between V+ and V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33V
Voltage at +IN, -IN, V
OUT
. . . . . . . . . . . . . (V-) - 0.5V to (V+) + 0.5V
Voltage between +IN and -IN . . . . . . . . . . . . . . . . . . . . . . . . . . . .±5V
Voltage at /Disable . . . . . . . . . . . . . . . . . . . (V+) - 10V to (V+) + 0.5V
Current into +IN, -IN, and /Disable. . . . . . . . . . . . . . . . . . . . . . ±5mA
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50mA
Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . See Curves
Operating Ambient Temperature Range . . . . . . . . . . . . . .0° to 75°C
Operating Junction Temperature PDIP or SO . . . . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
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
J
= T
C
= T
A
Open-Loop DC Electrical Specifications
PARAMETER
V
OS
V
OS
/T
I
B+
I
B-
CMRR
-ICMR
PSRR
+IPSR
-IPSR
R
OL
A
VOL
+R
IN
V
IN
V
O
I
SC
I
O,DIS
V
DIS,ON
V
DIS,OFF
I
DIS,ON
I
DIS,OFF
I
S
NOTES:
1. The input is moved from -3V to +3V
2. The supplies are moved from ±5V to ±15V
DESCRIPTION
Input Offset Voltage
V
S
= ±15V
Input Offset Drift
+V
IN
Input Bias Current
-V
IN
Input Bias Current
Common-Mode Rejection (Note 1)
V
S
= ±5V; R
L
= 150Ω, T
A
= 25°C unless otherwise specified
TEMP
Full
Full
Full
Full
Full
Full
Full
Full
25°C
Full
Full
Full
25°C
Full
Full
25°C
Full
Full
Full
Full
Full
Full
1.0
17
20
(V+) - 1
(V+) - 4
5
±3.0
±3.0
70
58
65
50
MIN
TYP
4
2
20
5
10
55
8
80
0.03
0.6
140
66
2
±3.5
±3.5
100
5
50
5
20
15
50
MAX
20
25
UNITS
mV
mV
µV/°C
µA
µA
dB
µA/V
dB
µA/V
µA/V
kΩ
dB
MΩ
V
V
mA
µA
V
V
µA
mA
mA
-Input Current Common-Mode Rejection (Note 1)
Power Supply Rejection (Note 2)
+Input Current Power Supply Rejection (Note 2)
-Input Current Power Supply Rejection (Note 2)
Transimpedance
Voltage Gain
+V
IN
Input Impedance
+V
IN
Range
Output Voltage Swing
Output Short-Circuit Current
Output Current, Disabled
Disable Pin Voltage for Output Enabled
Disable Pin Voltage for Output Disabled
Disable Pin Current for Output Enabled
Disable Pin Current for Output Disabled
Supply Current (V
S
= ±15V)
2
EL2120
Closed-Loop AC Electrical Specifications
PARAMETER
SR
V
S
= ±15V; A
V
= +2 (R
F
= R
G
= 270Ω); R
L
= 150Ω; C
L
= 7pF; C
IN-
= 2pF; T
A
= 25°C
MIN
TYP
MAX LEVEL
UNITS
DESCRIPTION
Slew Rate; V
OUT
from -3V to +3V
Measured at -2V and +2V
V
S
= ±15V
V
S
= ±5V
750
550
V/µs
V/µs
t
S
Settling Time to 0.25% of a
0 to +10V Swing; A
V
= +1 with
R
F
= 270Ω, R
G
= ×, and R
L
= 400Ω
Bandwidth
-3dB
±1dB
±0.1dB
-3dB
±1dB
±0.1dB
50
95
50
16
75
35
11
0.5
ns
MHz
MHz
MHz
MHz
MHz
MHz
dB
BW
BW@2.5V
Bandwidth at
V
S
= ±2.5V
Peaking
dG
Differential Gain; DC Offset
from -0.7V through +0.7V, AC
Amplitude 286 mVp–p
V
S
= ±15V, f = 3.58MHz
V
S
= ±15V, f = 30MHz
V
S
= ±5V, f = 3.58MHz
Differential Phase; DC Offset
from -0.7V through +0.7V, AC
Amplitude 286 mVp–p
V
S
= ±15V, f = 3.58MHz
V
S
= ±15V, f = 30MHz
V
S
= ±5V, f = 3.58MHz
<0.01
0.1
0.01
%
%
%
dθ
0.01
0.1
0.06
°
°
°
Typical Performance Curves
AC Test Circuit
Frequency Response vs R
F
Frequency Response vs Gain
Frequency Response vs Load
3
EL2120
Typical Performance Curves
(Continued)
Gain Flatness vs C
IN
-
Gain Flatness vs R
F
-3dB Bandwidth, 0.1dB Bandwidth,
and Peaking vs Temperature
at V
S
±15V
-3dB Bandwidth, 0.1dB Bandwidth,
and Peaking vs Temperature
at V
S
±5V
-3dB Bandwidth, 0.1dB Bandwidth,
and Peaking vs Supply Voltage
Deviation From Linear
Phase vs Frequency
4
EL2120
Typical Performance Curves
(Continued)
Differential Gain vs
DC Input Offset
at 3.58MHz
Differential Phase vs
DC Input Offset
at 3.58MHz
Differential Gain vs
DC Input Offset
at 30MHz
Differential Phase vs
DC Input Offset
at 30MHz
Differential Gain and Phase
vs Supply Voltage
(V
IN
, DC from 0 to +0.7V)
Input Noise Voltage
and Current
5
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