1
FN7042
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.
EL2110
Low Cost, Gain of 1, Video Op Amp
The EL2110 operational amplifier, built
using Elantec's complementary 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 EL2110 will drive a 150
load to +2V, with a
bandwidth of 50MHz. This device achieves 0.1dB bandwidth
at 5MHz.
The recommended power supply voltage is 5V. At zero and
5V supplies, the inputs will operate to ground. When the
outputs are at 0V the amplifier draws only 2.4mA of supply
current.
Features
Optimized for 5V operation
Stable at gain of 1
50MHz gain bandwidth product
130V/s slew rate
Drives 150
load to video levels
Input and outputs operate at negative supply rail
Applications
Consumer video amplifier
Active filters/integrators
Cost sensitive applications
Single supply amplifiers
*EL2110CW symbol is .Dxxx where xxx represents date code
Ordering Information
PART
NUMBER
PACKAGE
TAPE & REEL
PKG. NO.
EL2110CN
8-Pin PDIP
-
MDP0031
EL2110CS
8-Pin SO
-
MDP0027
EL2110CW
5-Pin SOT-23*
-
MDP0038
Pinouts
EL2110
(5-PIN SOT23)
TOP VIEW
EL2110
(8-PIN PDIP, SO)
TOP VIEW
1
2
3
5
4
OUT
GND
IN+
VS+
IN-
-
+
1
2
3
4
8
7
6
5
NC
IN-
IN+
GND
NC
VS+
OUT
NC
-
+
Data Sheet
November 14, 2002
OBS
OLE
TE P
ROD
UCT
NO R
ECO
MME
NDE
D RE
PLAC
EME
NT
cont
act o
ur Te
chni
cal S
uppo
rt Ce
nter
at
1-888
-INTE
RSIL
or w
ww.i
nters
il.com
/tsc
2
Absolute Maximum Ratings
(T
A
= 25C)
Total Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . 75mA per amplifier
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Storage Temperature Range . . . . . . . . . . . . . . . . . . -65C to +150C
Operating Temperature Range . . . . . . . . . . . . . . . . -40C to +85C
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
DC Electrical Specifications
V
S
= +5V, R
L
= 1k
, V
IN
= 1V, T
A
= 25C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
V
OS
Input Offset Voltage
-20
10
20
mV
TCV
OS
Average Offset Voltage Drift
(Note 1)
-50
V/C
I
B
Input Bias Current
-15
-7
-3
A
I
OS
Input Offset Current
-1
0.3
1.0
A
TCI
OS
Average Offset Current Drift
(Note 1)
-3
nA/C
A
VOL
Open Loop Gain
V
OUT
= 0.5, 2.5, R
L
= 1k
160
250
V/V
V
OUT
= 0.5, 2.5, R
L
= 150k
160
250
V/V
PSRR
Power Supply Rejection Ratio
V
S
= 4.5V to 5.5V
43
50
dB
CMRR
Common Mode Rejection Ratio
V
CM
= 0V to 3.8V
55
65
dB
CMIR
Common Mode Input Range
0.0
3.0
V
V
OUT
Output Voltage Swing
R
FB
= R
G
= 1k
, R
L
= 150
2.8
3.2
V
I
SC
Output Short Circuit Current
Output to Ground (Note 2)
75
125
mA
I
S
Supply Current
No load (per channel) V
IN
= 0V
2.0
2.4
3.0
mA
R
IN
Input Resistance
Differential
150
k
Common mode
1.5
M
C
IN
Input Capacitance
A
V
= 1 @ 10MHz
1
pF
R
OUT
Output Resistance
0.150
W
PSOR
Power Supply Operating Range
Single supply
4
6
V
NOTES:
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.
Closed-Loop AC Electrical Specifications
V
S
= 5V, AC Test Figure, T
A
= 25C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
BW
-3dB Bandwidth (V
OUT
= 0.4mV
P-P
)
A
V
= 1
100
MHz
0.1dB Bandwidth (V
OUT
= 0.4mV
P-P
) A
V
= 1
10
MHz
GBWP
Gain Bandwidth Product
50
MHz
PM
Phase Margin
55
SR
Slew Rate
85
130
V/s
FBWP
Full Power Bandwidth
(Note 1)
8
11
MHz
t
R
, t
F
Rise Time, Fall Time
0.1V step
2
ns
OS
Overshoot
0.1V step
15
%
EL2110
3
NOTES:
1. For V
S
= 5V, V
OUT
= 4V
P-P
. 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
= 150
t
PD
Propagation Delay
3.5
ns
t
S
Settling to 0.1% (A
V
= 1)
VS = 5V, 2V step
80
ns
dG
Differential Gain (Note 2)
NTSC/PAL
0.1
%
dP
Differential Phase (Note 2)
NTSC/PAL
0.2
e
N
Input Noise Voltage
10kHz
15
nV/
Hz
i
N
Input Noise Current
10kHz
1.5
nV/
Hz
CS
Channel Separation
P = 5MHz
55
dB
Closed-Loop AC Electrical Specifications
V
S
= 5V, AC Test Figure, T
A
= 25C unless otherwise specified. (Continued)
PARAMETER
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
EL2110
4
Typical Performance Curves
Simplified Block Diagram
Applications Information
Product Description
The EL2110 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.
Power Supplies
The EL2110 is designed to work at a supply voltage
difference of 4.5V to 5.5V. It will work on any combination of
supplies. All electrical characteristics are measured with a
5V supply.
Output Swing vs Load
Please refer to the simplified block diagram. This amplifier
provides an NPN pull-up transistor output and a passive
1250
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 200mV of V
S
-
.
Output Drive Capability
This device does not have short circuit protection. Each
output is capable of than 100mA into a shorted output. Care
must be used in the design to limit the output current with a
series resistor.
Single 5V Supply Video Cable Driver
These amplifiers may be used as a direct coupled video
cable driver with a gain of 2. With a 75
back matching
resistor driving a terminated 75
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 0.3V and
0.5V. With R
A
= 68k and R
B
= 4.7k the input offset will be
0.32V. Since these amplifiers require a DC load at their
outputs it is good design practice to add a 250
resistor to
ground directly at the amplifier output. Then if the 75
cable
termination resistor were inadvertently removed there would
still be an output signal. 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 75
back
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Pin SO
Maximum Power Dissipation
vs Ambient Temperature
5-Pin SOT23
Maximum Power Dissipation
vs Ambient Temperature
EL2110
5
matching resistor to a cable and a 75
load to ground at the
end of the cable provide a 150
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 250
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 0.6V to 3V.
Input capacitive coupling will increase the needed dynamic
range of the amplifier. The standard NTSC video signal is 1V
peak to peak plus 143mV for the color AC peak. The video
signal is made up of the -286mV sync pulse plus the 714mV
picture signal which may very from 0V to 714mV. The video
signal average value for a black picture is about 28mV
(Figure 2) and with a white picture level is about 583mV
(Figure 3). This gives a maximum change in average value
of about 555mV. A direct coupled amplifier with a standard
NTSC video signal needs a dynamic range of 1.143V. But
with input capacitance coupling the dynamic range
requirements are the sum of the 1.143V video plus the
average picture value change of 0.555V or 1.698V
P-P
. At a
gain of two this doubles to 3.394V. These amplifiers do not
have this much dynamic range so a gain of less than 2 must
be used to avoid waveform compression under all
conditions.
Capacitively coupling the input and output is worse than a
capacitor only on the input. Without any special
compromises you can only take a gain of one. But if the
backmatch resistor is reduced to 36
, reducing the output
+
Video
1V
75
RIS
V
IN
RIL
4.7K
75
RB
+
-
AMP
1K
RF
1K
RG
0.1F
CB
68K
RA
0.32VB
+
V1
5V
0.64VB
25
0
RPD
V AMP
V
OUT
75
RC
L
75
RO
1V
FIGURE 1. VIDEO PATH
0.714V
0.0V
-0.286V
10s
5.1s
3.8s
1.3s
53s
0.6
0.867
0.583V
Gain = 2
1.8V offset
Amp
OutVolts
0
+0.348
1.166
1.8
1.428
2.062
-0.572
+0.062
FIGURE 2. WHITE LEVEL VIDEO
0.714V
0.0V
-0.286V
Gain = 2
1.8V offset
Amp Out
Volts
+1.8
+3.172
+56mV
+1.172
FIGURE 3. BLACK LEVEL VIDEO
53mV
Average BL
+45mV
0.686V
+28mV
Average Picture Value Change -- 555mV
EL2110
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