EL4451C
October
1994
Rev
A
EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ``controlled document'' Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1994 Elantec Inc
Features
Complete variable-gain amplifier
with output amplifier requires
no extra components
Excellent linearity of 0 2%
70 MHz signal bandwidth
Operates on
g
5V to
g
15V
supplies
All inputs are differential
400V ms slew rate
l
70dB attenuation
4 MHz
Applications
Leveling of varying inputs
Variable filters
Fading
Text insertion into video
Ordering Information
Part No
Temp Range
Package
Outline
EL4451CN
b
40 C to
a
85 C 14-Pin P-DIP
MDP0031
EL4451CS
b
40 C to
a
85 C
14-Lead SO
MDP0027
General Description
The EL4451C is a complete variable gain circuit It offers wide
bandwidth and excellent linearity while including a powerful
output voltage amplifier drawing modest supply current
The EL4451C operates on
g
5V to
g
15V supplies and has an
analog input range of
g
2V making it ideal for video signal
processing AC characteristics do not change appreciably over
the
g
5V to
g
15V supply range
The circuit has an operational temperature range of
b
40 C to
a
85 C and is packaged in plastic 14-pin DIP and 14-lead SO
The EL4451C is fabricated with Elantec's proprietary comple-
mentary bipolar process which provides excellent signal sym-
metry and is free from latch up
Connection Diagram
4451-1
EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Absolute Maximum Ratings
(T
A
e
25 C)
V
a
Positive Supply Voltage
16 5V
V
S
V
a
to V
b
Supply Voltage
33V
V
IN
Voltage at any Input or Feedback
V
a
to V
b
DV
IN
Difference between Pairs
of Inputs or Feedback
6V
I
IN
Current into any Input or Feedback Pin
4mA
I
OUT
Continuous Output Current
30mA
P
D
Maximum Power Dissipation
See Curves
T
A
Operating Temperature Range
b
40 C to
a
85 C
T
S
Storage Temperature Range
b
60 C to
a
150 C
Important Note
All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually
performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test
equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore T
J
e
T
C
e
T
A
Test Level
Test Procedure
I
100% production tested and QA sample tested per QA test plan QCX0002
II
100% production tested at T
A
e
25 C and QA sample tested at T
A
e
25 C
T
MAX
and T
MIN
per QA test plan QCX0002
III
QA sample tested per QA test plan QCX0002
IV
Parameter is guaranteed (but not tested) by Design and Characterization Data
V
Parameter is typical value at T
A
e
25 C for information purposes only
Open-Loop DC Electrical Characteristics
Power Supplies at
g
5V T
A
e
25 C R
L
e
500
X
Parameter
Description
Min
Typ
Max
Test
Units
Level
V
DIFF
Signal input differential input voltage - Clipping
1 8
2 0
I
V
0 2% nonlinearity
1 3
V
V
V
CM
Common-mode range of V
IN
V
DIFF
e
0 V
s
e
g
5V
g
2 0
g
2 8
I
V
V
s
e
g
15V
g
12 8
V
V
V
OS
Input offset voltage
7
25
I
mV
V
OS
FB
Output offset voltage
8
25
I
mV
V
G 100%
Extrapolated voltage for 100% gain
1 9
2 1
2 2
I
V
V
G 0%
Extrapolated voltage for 0% gain
b
0 16
b
0 06
0 06
I
V
V
G 1V
Gain at V
GAIN
e
1V
0 95
1 05
1 15
I
V V
I
B
Input bias current (all inputs)
b
20
b
9
0
I
mA
I
OS
Input offset current between V
IN
a
and V
IN
b
0 2
4
I
mA
Gain
a
and Gain
b
FB and Ref
NL
Nonlinearity V
IN
between
b
1V and
a
1V V
G
e
1V
0 2
0 5
I
%
Ft
Signal feedthrough V
G
e b
1V
b
100
b
70
I
dB
R
IN
V
IN
Input resistance V
IN
100
230
I
K
X
R
IN
FB
Input resistance FB
200
460
V
K
X
R
IN
R
GAIN
Input resistance gain input
50
100
I
K
X
2
TD
is
33in
EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Open-Loop DC Electrical Characteristics
Contd
Power Supplies at
g
5V T
A
e
25 C R
L
e
500
X
Parameter
Description
Min
Typ
Max
Test
Units
Level
CMRR
Common-mode rejection ratio of V
IN
70
90
I
dB
PSRR
Power supply rejection ratio of V
OS FB
V
S
e
g
5V to
g
15V
50
60
I
dB
V
O
Output voltage swing V
S
e
g
5V
g
2 5
g
2 8
I
V
(V
IN
e
0 V
REF
varied) V
S
e
g
15V
g
12 5
g
12 8
I
SC
Output short-circuit current
40
85
I
mA
I
S
Supply current V
S
e
g
15V
15 5
18
I
mA
Closed-Loop AC Electrical Characteristics
Power supplies at
g
12V T
A
e
25 C R
L
e
500
X C
L
e
15pF V
G
e
1V
Parameter
Description
Min
Typ
Max
Test
Units
Level
BW
b
3dB
b
3dB small-signal bandwidth signal input
70
V
MHz
BW
g
0 1dB
0 1dB flatness bandwidth signal input
10
V
MHz
Peaking
Frequency response peaking
0 6
V
dB
BW gain
b
3dB small-signal bandwidth gain input
70
V
MHz
SR
Slew rate V
OUT
between
b
2V and
a
2V R
F
e
R
G
e
500
X
400
V
V
ms
V
N
Input referred noise voltage density
110
V
nV
S
Hz
dG
Differential gain error Voffset between
b
0 7V and
a
0 7V
0 9
V
%
d
i
Differential phase error Voffset between
b
0 7V and
a
0 7V
0 2
V
Test Circuit
4451 3
Note For typical performance curves R
F
e
0 R
G
e
%
V
GAIN
e
1V R
L
e
500
X and C
L
e
15 pF unless otherwise noted
3
TD
is
18in
TD
is
18in
EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Typical Performance Curves
Frequency Response
for Various Feedback
Divider Ratios
4451 4
Frequency Response
for Various R
L
C
L
V
S
e
g
5V
4451 5
Frequency Response
for Various R
L
C
L
V
S
e
g
15V
4451 6
Gain b3 dB Bandwidth
and Peaking
vs Load Resistance
4451 7
b
3 dB Bandwidth and Peaking
vs Supply Voltage
4451 8
b
3 dB Bandwidth and Peaking
vs Die Temperature
4451 9
Frequency Response for
Various Gain Settings
4451 10
Slew Rate
vs Supply Voltage
4451 11
Slew Rate
vs Die Temperature
4451 12
4
EL4451C
Wideband Variable-Gain Amplifier Gain of 2
Typical Performance Curves
Contd
Common-Mode
Rejection Ratio
vs Frequency
4451 13
Input Voltage Noise
vs Frequency
4451 14
Nonlinearity vs
Input Signal
4451 15
Differential Gain Error
vs Input Offset Voltage
V
S
e
g
5V or
g
12V
4451 16
Differential Phase Error
vs Input Offset Voltage
V
S
e
g
5V
4451 17
Differential Phase Error
vs Input Offset Voltage
V
S
e
g
12V
4451 18
Differential Gain
and Phase Errors
vs Gain Setting
4451 19
Differential Gain
and Phase Errors
vs Load Resistance
4451 20
5
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