1
FN7026
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
EL2020
50MHz Current Feedback Amplifier
The EL2020 is a fast settling, wide
bandwidth amplifier optimized for
gains between -10 and +10. Built using
the Elantec monolithic Complementary Bipolar process, this
amplifier uses current mode feedback to achieve more
bandwidth at a given gain then a conventional voltage
feedback operational amplifier.
The EL2020 will drive two double terminated 75
coax
cables to video levels with low distortion. Since it is a closed
loop device, the EL2020 provides better gain accuracy and
lower distortion than an open loop buffer. The device
includes output short circuit protection, and input offset
adjust capability.
The bandwidth and slew rate of the EL2020 are relatively
independent of the closed loop gain taken. The 50MHz
bandwidth at unity gain only reduces to 30MHz at a gain of
10. The EL2020 may be used in most applications where a
conventional op amp is used, with a big improvement in
speed power product.
Features
Slew rate 500V/s
33mA output current
Drives 2.4V into 75
Differential phase < 0.1
Differential gain < 0.1%
V supply 5V to 18V
Output short circuit protected
Uses current mode feedback
1% settling time of 50ns for 10V step
Low cost
9mA supply current
8-pin mini-dip
Applications
Video gain block
Residue amplifier
Radar systems
Current to voltage converter
Coax cable driver with gain of 2
Ordering Information
PART NUMBER
TEMP. RANGE
PACKAGE
PKG. NO.
EL2020CN
-40C to +85C
8-Pin PDIP
MDP0031
EL2020CM
-40C to +85C
20-Pin SOL
MDP0027
Pinouts
EL2020
(8-PIN PDIP)
TOP VIEW
EL2020
(20-PIN SOL)
TOP VIEW
Data Sheet
December 1995, Rev. G
Manufactured under U.S. Patent No. 4,893,091.
OBS
OLET
E PR
ODU
CT
NO R
ECO
MME
NDED
REP
LACE
MEN
T
cont
act o
ur Te
chnic
al Su
ppor
t Cen
ter a
t
1-888
-INTE
RSIL
or w
ww.in
tersil
.com
/tsc
2
Absolute Maximum Ratings
(T
A
= 25C)
V
S
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 18V or 36V
V
IN
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V or V
S
V
IN
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . .10V
I
IN
Input Current (Pins 2 or 3). . . . . . . . . . . . . . . . . . . . . . 10mA
I
INS
Input Current (Pins 1, 5, or 8) . . . . . . . . . . . . . . . . . . . . 5mA
P
D
Maximum Power Dissipation . . . . . . . . . . (See Curves)1.25W
A heat sink is required to keep the junction temperature below the absolute
maximum when the output is short circuited
I
OP
Peak Output Current . . . . . . . . . . . . . . Short Circuit Protected
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Continuous
T
A
Operating Temperature Range . . . . . . . . . . . . . -40C to +85C
T
J
Operating Junction Temperature
Plastic Package, SOL . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C
T
ST
Storage Temperature . . . . . . . . . . . . . . . . . . . -65C to +150C
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 Electrical Specifications
V
S
= 15V
PARAMETER
DESCRIPTION
TEMP
LIMITS
UNITS
MIN
TYP
MAX
V
OS
(Note 1)
Input Offset Voltage
25C
-10
3
+10
mV
T
MIN
, T
MAX
-15
+15
mV
V
OS
/
T
Offset Voltage Drift
-30
V/C
CMRR (Note 2)
Common Mode Rejection Ratio
ALL
50
60
dB
PSRR (Note 3)
Power Supply Rejection Ratio
25C
65
75
dB
T
MIN
, T
MAX
60
dB
+I
IN
Non-inverting Input Current
25C, T
MAX
-15
5
+15
A
T
MIN
-25
+25
A
+R
IN
Non-Inverting Input Resistance
ALL
1
5
M
+IPSR (Note 3)
Non-Inverting Input Current
Power Supply Rejection
25C, T
MAX
0.05
0.5
A/V
T
MIN
1.0
A/V
-I
IN
( Note 1)
-Input Current
25C, T
MAX
-40
10
+40
A
T
MIN
-50
+50
A
-ICMR (Note 2)
-Input Current
Common Mode Rejection
25C, T
MAX
0.5
2.0
A/V
T
MIN
4.0
A/V
-IPSR (Note 3)
-Input Current
Power Supply Rejection
25C, T
MAX
0.05
0.5
A/V
T
MIN
1.0
A/V
R
ol
Transimpedence (
V
OUT
/
(-I
IN
))
R
L
= 400
, V
OUT
= 10V
25C, T
MAX
300
1000
V/mA
T
MIN
50
V/mA
A
VOL1
Open Loop DC Voltage Gain
R
L
= 400
, V
OUT
= 10V
25C, T
MAX
70
80
dB
T
MIN
60
dB
A
VOL2
Open Loop DC Voltage Gain
R
L
= 100
, V
OUT
= 2.5V
25C, T
MAX
60
70
dB
T
MIN
55
dB
V
O
Output Voltage Swing
R
L
= 400
25C, T
MAX
12
13
V
T
MIN
11
V
I
OUT
Output Current
R
L
= 400
25C, T
MAX
30
32.5
mA
T
MIN
27.5
mA
EL2020
3
I
S
Quiescent Supply Current
25C
9
12
mA
T
MIN
, T
MAX
15
mA
I
S OFF
Supply Current, Disabled, V
8
= 0V
ALL
5.5
7.5
mA
I
LOGIC
Pin 8 Current, Pin 8 = 0V
ALL
1.1
1.5
mA
I
D
Min Pin 8 Current to Disable
ALL
120
250
A
I
E
Max Pin 8 Current to Enable
ALL
30
A
NOTES:
1. The offset voltage and inverting input current can be adjusted with an external 10k
pot between pins 1 and 5 with the wiper connected to V
CC
(Pin 7) to make the output offset voltage zero.
2. V
CM
= 10V.
3. 4.5V
V
S
18V.
Open Loop Electrical Specifications
V
S
= 15V (Continued)
PARAMETER
DESCRIPTION
TEMP
LIMITS
UNITS
MIN
TYP
MAX
AC Closed Loop Electrical Specifications
V
S
= 15V, T
A
= 25C
PARAMETER
DESCRIPTION
MIN
TYP
MAX
UNITS
SR1
FPBW1
t
R
1
t
F
1
t
P
1
Closed Loop Gain of 1V/V (0dB), R
F
= 1k
Slew Rate, R
l
= 400
, V
O
= 10V, test at V
O
= 5V
Full Power Bandwidth (Note 1)
Rise Time, R
l
= 100
, V
OUT
= 1V, 10% to 90%
Fall Time, R
l
= 100
, V
OUT
= 1V, 10% to 90%
Propagation Delay, R
l
= 100
, V
OUT
= 1V, 50% Points
300
4.77
500
7.95
6
6
8
V/s
MHz
ns
ns
ns
BW
t
S
t
S
Closed Loop Gain of 1V/V (0dB), R
F
= 820
-3dB Small Signal Bandwidth, R
l
= 100
, V
O
= 100mV
1% Settling Time, R
l
= 400
, V
O
= 10V
0.1% Settling Time, R
l
= 400
, V
O
= 10V
50
50
90
MHz
ns
ns
SR10
FPBW10
t
R
10
t
F
10
t
P
10
Closed Loop Gain of 10V/V (20dB), R
F
= 1 k
, R
G
= 111
Slew Rate, R
l
= 400
, V
O
= 10V, Test at V
O
= 5V
Full Power Bandwidth
Rise Time, R
l
= 100
, V
OUT
= 1V, 10% to 90%
Fall Time, R
l
= 100
, V
OUT
= 1V, 10% to 90%
Propagation Delay, R
l
= 100
, V
OUT
= 1V, 50% points
300
4.77
500
7.95
25
25
12
V/s
MHz
ns
ns
ns
BW
t
S
t
S
Closed Loop Gain of 10V/V (20dB), R
F
= 680
, R
G
= 76
-3dB Small Signal Bandwidth, R
l
= 100
, V
O
= 100mV
1% Settling Time, R
l
= 400
, V
O
= 10V
0.1% Settling Time, R
l
= 400
, V
O
= 10V
30
55
280
MHz
ns
ns
NOTE:
1. Full Power Bandwidth is guaranteed based on Slew Rate measurement. FPBW = SR/2
V
peak
.
EL2020
4
Typical Performance Curves Non-Inverting Gain of One
A
VCL
= +1
Gain vs Frequency
Phase Shift vs
Frequency
Settling Time vs
Output Swing
Slew Rate vs
Supply Voltage
Rise Time and
Prop Delay vs
Temperature
-3dB Bandwidth vs
Supply Voltage
Slew Rate vs
Temperature
EL2020
5
Typical Performance Curves Non-Inverting Gain of One
(Continued)
A
VCL
= -1
Gain vs Frequency
Phase Shift vs
Frequency
Settling Time vs
Output Swing
Slew Rate vs
Supply Voltage
Rise Time and
Prop Delay vs
Temperature
-3dB Bandwidth vs
Supply Voltage
Slew Rate vs
Temperature
EL2020
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