EL2220C
EL2220C
Dual, Low Cost, Gain of 1, Video Op Amp
Features
•
•
•
•
•
•
Optimized for 5V operation
Stable at gain of 1
50 MHz Gain bandwidth product
130 V/µs slew rate
Drives 150Ω load to video levels
Input and outputs operate at
negative supply rail
•
-60 dB isolation at 4.2 MHz
General Description
The EL2220C operational amplifier, built using Elantec’s comple-
mentary bipolar process, offers unprecedented high frequency
performance at a very low cost. It is suitable for any application, such
as consumer video, where traditional DC performance specifications
are of secondary importance to the high frequency specifications. On a
5V supply at a gain of +1 the EL2220C will drive a 150Ω load to +2V,
with a bandwidth of 50 MHz. This device achieves 0.1 dB bandwidth
at 5 MHz.
The recommended power supply voltage is 5V. At zero and 5V sup-
plies, the inputs will operate to ground. When the outputs are at 0V the
amplifier draws only 2.4 mA of supply current.
Applications
•
•
•
•
Consumer video amplifier
Active filters/integrators
Cost sensitive applications
Single supply amplifiers
Ordering Information
Part No
EL2220CN
EL2220CS
Temp. Range
-40°C to +85°C
-40°C to +85°C
Package
8-Lead P-DIP
8-Lead SO
Outline #
MDP0031
MDP0027
Connection Diagram
P-DIP, SO
February 1997 Rev A
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.
© 1997 Elantec, Inc.
EL2220C
EL2220C
Dual, Low Cost, Gain of 1, Video Op Amp
Absolute Maximum Ratings
(T
Total Supply Voltage
Input Voltage
Differential Input Voltage
Peak Output Current
A
= 25 °C)
18V
-6V
S
6V
75 mA per amplifier
Power Dissipation
Storage Temperature Range
Operating Temperature Range
See Curves
-65°C to +150°C
-40°C to +85°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, therefor T
J
= T
C
= T
A
.
Test Level
I
II
III
IV
V
Test Procedure
100% production tested and QA sample tested per QA test plan QCX0002.
100% production tested at T
A
= 25°C and QA sample tested at T
A
= 25°C, T
MAX
and T
MIN
per QA test plan QCX0002.
QA sample tested per QA test plan QCX0002.
Parameter is guaranteed (but not tested) by Design and Characterization Data.
Parameter is typical value at T
A
= 25°C for information purposes only.
DC Characteristics
V
S
=+5V, R
L
=1K
Ω,
V
IN
=1V, T
A
=25°C unless otherwise specified.
Parameter
V
OS
TCV
OS
I
B
I
OS
TCI
OS
A
VOL
PSRR
CMRR
CMIR
V
OUT
I
SC
I
S
R
IN
C
IN
R
OUT
PSOR
Description
Input Offset Voltage
Average Offset Voltage Drift
Input Bias Current
Input Offset Current
Average Offset Current Drift
Open Loop Gain
Power Supply Rejection Ratio
Common Mode Rejection Ratio
Common Mode Input Range
Output Voltage Swing
Output Short Circuit Current
Supply Current
Input Resistance
Input Capacitance
Output Resistance
Power Supply Operating Range
Single Supply
4
RFB = R
G
= 1K, R
L
= 150Ω
Output to Ground
Differential
Common Mode
A
V
= +1 @ 10 MHz
[2]
[1]
[1]
Conditions
Min
-20
-15
-1
160
160
43
55
0.0
2.8
75
2.0
Typ
10
-50
-7
0.3
-3
250
250
50
65
Max
20
-3
1.0
Test
Level
I
V
I
I
V
I
V
I
I
Units
mV
µV/°C
µA
µA
nA/°C
V/V
V/V
dB
dB
V
V
mA
mA
KΩ
MΩ
pF
Ω
V
V
OUT=.
.5, 2.5, R
L
= 1KΩ
V
OUT=.
.5, 2.5, R
L
= 150KΩ
V
S
= 4.5V to 5.5V
VCM = 0V to +3.8V
3.0
3.2
125
2.4
150
1.5
1
0.150
6
3.0
I
I
I
V
V
V
V
V
No Load (per channel) V
IN
= 0V
1. Measured from T
MIN
to T
MAX
.
2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.
2
EL2220C
EL2220C
Dual, Low Cost, Gain of 1, Video Op Amp
Closed Loop AC Electrical Characteristics
V
S
=5V, AC Test Figure, T
A
= 25°C unless otherwise specified
Parameter
BW
GBWP
PM
SR
FBWP
t
R
, t
F
OS
t
PD
t
S
dG
dP
e
N
i
N
CS
Description
-3dB Bandwidth (V
OUT
= 0.4 mVp-p)
±0.1 dB Bandwidth (V
OUT
= 0.4 mVp-p)
Gain Bandwith Product
Phase Margin
Slew Rate
Full Power Bandwidth
Rise Time, Fall Time
Overshoot
Propagation Delay
Settling to 0.1% (A
V
= 1)
Differential Gain
Differential Phase
[2]
[2]
[1]
Conditions
A
V
= +1
A
V
= +1
Min
Typ
100
10
50
55
Max
Test
Level
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Units
MHz
MHz
MHz
(°)
V/µs
MHz
ns
%
ns
ns
%
(°)
nV/rt(Hz)
nV/rt(Hz)
dB
85
8
0.1V step
0.1V step
VS = 5V, 2V Step
NTSC/PAL
NTSC/PAL
10 KHz
10 KHz
P = 5 MHz
130
11
2
15
3.5
80
0.1
0.2
15
1.5
55
Input Noise Voltage
Input Noise Current
Channel Separation
1. For V
S
= 5V, V
OUT
= 4V
pp
. Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*V
peak
)
2. Video performance measured at V
S
= 5V, A
V
= +2 with 2 times normal video level across R
L
= 150Ω
3
EL2220C
EL2220C
Dual, Low Cost, Gain of 1, Video Op Amp
Typical Performance Curves
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Lead SO
Maximum Power Dissipation
vs Ambient Temperature
Simplified Block Diagram
4
EL2220C
EL2220C
Dual, Low Cost, Gain of 1, Video Op Amp
Applications Information
Product Description
The EL2220C operational amplifier is stable at a gain of
1. It is built on Elantec’s proprietary complimentary
bipolar process. This topology allows it to be used in a
variety of applications where current mode amplifiers
are not appropriate because of restrictions placed on the
feedback elements. This product is especially designed
for applications where high bandwidth and good video
performance characteristics are desired but the higher
cost of more flexible and sophisticated products are
prohibitive.
Single 5 Volt Supply Video Cable Driver
These amplifiers may be used as a direct coupled video
cable driver with a gain of 2. With a 75Ω back matching
resistor driving a terminated 75Ω cable the output at the
cable load will be original video level (1V NTSC). The
best operating mode is with direct coupling. The input
signal must be offset to keep the entire signal within the
range of the amplifier. The required offset voltage can
be set with a resistor divider and a bypass capacitor in
the video path (Figure
1).
The input DC offset should be
between .3V and .5V. With R
A
=68K and R
B
=4.7K the
input offset will be .32V. Since these amplifiers require
a DC load at their outputs it is good design practice to
add a 250Ω resistor to ground directly at the amplifier
output. Then if the 75Ω cable termination resistor were
inadvertently removed there would still be an output sig-
nal. The values in figure 1 give an output range of 0V to
2.6V
Output capacitive coupling also has some restrictions.
These amplifiers require a DC load at their outputs. A
75Ω back matching resistor to a cable and a 75Ω load to
ground at the end of the cable provide a 150Ω DC load.
But output capacitive coupling opens this DC path so an
extra pulldown resistor on the amplifier output to ground
is required. Figure 4 shows a 250Ω resistor. Capacitively
coupling the output will require that we shift the output
offset voltage higher than in the direct coupled case.
Using R
A
=43K and R
B
=4.7K will make the quiescent
output offset voltage about 1V. The output dynamic
range will be .6V to 3V.
Power Supplies
The EL2220C is designed to work at a supply voltage
difference of 4.5V to 5.5V. It will work on any combina-
tion of ± supplies. All electrical characteristics are
measured with a 5V supply.
Output Swing vs Load
Please refer to the simplified block diagram. This ampli-
fier provides an NPN pull-up transistor output and a
passive 1250Ω pull-down resistor to the most negative
supply. In a application where the load is connected to
V
S
−
the output voltage can swing to within 200 mV of
V
S
− .
Output Drive Capability
This device does not have short circuit protection. Each
output is capable of than 100 mA into a shorted output.
Care must be used in the design to limit the output cur-
rent with a series resistor.
5
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