Intersil EL2110CW Low cost, gain of 1, video op amp Datasheet

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November 14, 2002
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®
EL2110
FN7042
Low Cost, Gain of 1, Video Op Amp
Features
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 150Ω load to +2V, with a
bandwidth of 50MHz. This device achieves 0.1dB bandwidth
at 5MHz.
• Optimized for 5V operation
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.
• Consumer video amplifier
• Stable at gain of 1
• 50MHz gain bandwidth product
• 130V/µs slew rate
• Drives 150Ω load to video levels
• Input and outputs operate at negative supply rail
Applications
• Active filters/integrators
• Cost sensitive applications
• Single supply amplifiers
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
*EL2110CW symbol is .Dxxx where xxx represents date code
Pinouts
EL2110
(8-PIN PDIP, SO)
TOP VIEW
EL2110
(5-PIN SOT23)
TOP VIEW
OUT
1
GND
2
IN+
3
5
VS+
-
8 NC
NC 1
IN- 2
+
-
7 VS+
+
4
IN-
IN+ 3
GND 4
1
6 OUT
5 NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | 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
Absolute Maximum Ratings (TA = 25°C)
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . -40°C to +85°C
Total Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6VS
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V
Peak Output Current . . . . . . . . . . . . . . . . . . . . . . 75mA per amplifier
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: TJ = TC = TA
DC Electrical Specifications
PARAMETER
VS = +5V, RL = 1kΩ, VIN = 1V, TA = 25°C unless otherwise specified.
DESCRIPTION
CONDITIONS
MIN
TYP
MAX
UNIT
-20
10
20
mV
VOS
Input Offset Voltage
TCVOS
Average Offset Voltage Drift
IB
Input Bias Current
-15
-7
-3
µA
IOS
Input Offset Current
-1
0.3
1.0
µA
TCIOS
Average Offset Current Drift
(Note 1)
AVOL
Open Loop Gain
VOUT = 0.5, 2.5, RL = 1kΩ
(Note 1)
-50
µV/°C
-3
nA/°C
160
250
V/V
VOUT = 0.5, 2.5, RL = 150kΩ
160
250
V/V
PSRR
Power Supply Rejection Ratio
VS = 4.5V to 5.5V
43
50
dB
CMRR
Common Mode Rejection Ratio
VCM = 0V to 3.8V
55
65
dB
CMIR
Common Mode Input Range
VOUT
Output Voltage Swing
RFB = RG = 1kΩ, RL = 150Ω
2.8
3.2
V
ISC
Output Short Circuit Current
Output to Ground (Note 2)
75
125
mA
IS
Supply Current
No load (per channel) VIN = 0V
2.0
2.4
RIN
Input Resistance
Differential
150
kΩ
Common mode
1.5
MΩ
1
pF
0.150
W
CIN
Input Capacitance
ROUT
Output Resistance
PSOR
Power Supply Operating Range
0.0
AV = 1 @ 10MHz
Single supply
3.0
4
3.0
V
mA
6
V
MAX
UNIT
NOTES:
1. Measured from TMIN to TMAX.
2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted.
Closed-Loop AC Electrical Specifications
PARAMETER
BW
VS = 5V, AC Test Figure, TA = 25°C unless otherwise specified.
DESCRIPTION
-3dB Bandwidth (VOUT = 0.4mVP-P)
CONDITIONS
MIN
TYP
AV = 1
100
MHz
±0.1dB Bandwidth (VOUT = 0.4mVP-P) AV = 1
10
MHz
GBWP
Gain Bandwidth Product
50
MHz
PM
Phase Margin
55
°
SR
Slew Rate
85
130
V/µs
FBWP
Full Power Bandwidth
(Note 1)
8
11
MHz
tR , tF
Rise Time, Fall Time
0.1V step
2
ns
OS
Overshoot
0.1V step
15
%
2
EL2110
Closed-Loop AC Electrical Specifications
PARAMETER
VS = 5V, AC Test Figure, TA = 25°C unless otherwise specified. (Continued)
DESCRIPTION
tPD
Propagation Delay
tS
Settling to 0.1% (AV = 1)
dG
CONDITIONS
MIN
TYP
MAX
UNIT
3.5
ns
VS = 5V, 2V step
80
ns
Differential Gain (Note 2)
NTSC/PAL
0.1
%
dP
Differential Phase (Note 2)
NTSC/PAL
0.2
°
eN
Input Noise Voltage
10kHz
15
nV/√Hz
iN
Input Noise Current
10kHz
1.5
nV/√Hz
CS
Channel Separation
P = 5MHz
55
dB
NOTES:
1. For VS = 5V, VOUT = 4VP-P. Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*VPEAK)
2. Video performance measured at VS = 5V, AV = 2 with 2 times normal video level across RL = 150Ω
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EL2110
Typical Performance Curves
8-Pin Plastic DIP
Maximum Power Dissipation
vs Ambient Temperature
8-Pin SO
Maximum Power Dissipation
vs Ambient Temperature
Simplified Block Diagram
5-Pin SOT23
Maximum Power Dissipation
vs Ambient Temperature
± 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
1250Ω pull-down resistor to the most negative supply. In a
application where the load is connected to VS- the output
voltage can swing to within 200mV of VS-.
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
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
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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 0.3V and
0.5V. With RA = 68k and RB = 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 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 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 75Ω back
EL2110
(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 1.698VP-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.
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 RA = 43k and
RB = 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
0.1µF
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 36Ω, reducing the output
0.32VB 68K
RA
CB
4.7K
+
AMP
0.64VB
V AMP
VOUT
1V
250
RIS
RCL
RO
75
75
75
RB
RPD
VIN
1K
1K
+
–
RG
75
RIL
RF
Video
1V
+
–
V1
5V
FIGURE 1. VIDEO PATH
Gain = 2
1.428
1.166
1.8V offset
Amp
OutVolts
2.062
1.8
0
-0.572
+0.348
+0.062
Gain = 2
1.8V offset
Amp Out
Volts
Ý10µs
53µs
0.714V
0.6
0.583V
0.867
0.0V
-0.286V
1.3µs
3.8µs
5.1µs
FIGURE 2. WHITE LEVEL VIDEO
0.714V
+3.172
53mV
Average BL
+45mV
0.686V
0.0V
-0.286V
+28mV
+56mV
+1.8
+1.172
Average Picture Value Change — 555mV
FIGURE 3. BLACK LEVEL VIDEO
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EL2110
Printed Circuit Layout
range requirement 25% and the output offset is shifted to
2.1V you can take a gain of 1.5 and have a standard NTSC
1V at the 75Ω load.
The EL2110 is well behaved, and easy to apply in most
applications. However, a few simple techniques will help
assure rapid, high quality results. As with any high frequency
device, good PCB layout is necessary for optimum
performance. Ground-plane construction is highly
recommended, as is good power supply bypassing. A 0.1µF
ceramic capacitor is recommended for bypassing both
supplies. Pin lengths should be as short as possible, and
bypass capacitors should be as close to the device pins as
possible. For good AC performance, parasitic capacitances
should be kept to a minimum at both inputs and at the
output. Resistor values should be kept under 5kΩ because
of the RC time constants associated with the parasitic
capacitance. Metal-film and carbon resistors are both
acceptable, use of wire-wound resistors is not recommended
because of their parasitic inductance. Similarly, capacitors
should be low-inductance for best performance.
A simple transistor, capacitor and resistor sync tip clamp
may be used when the input is already AC coupled to set the
sync tip to ground. This gives the input a fixed DC level and
can be used like a direct coupled input. The clamp uses a
PNP transistor with the collector at ground and the base has
a 200kΩ resistor to 5V. The emitter connects to the amplifier
input and a capacitor from the video input. The clamp
functions as an inverted Beta current source for input bias
current with plus inputs and a clamp to ground for minus
inputs. The RA and RB resistors are removed for the clamp
option (Figure 4).
2N3904
Clamp
Option
200K
PNP
RC
12K
RA
1.4VB
V AMP
36
RO
RPD
250
-
47µF
VOUT
1V
CO
75
2.1VB
RCL
AMP
RB
VIN
+
4.7K
CI
CB
0.1µF
47µF
RIS
+
–
RG
2K
RIL
RF
75
75
1K
5V
V1
+ Video
– 1V
FIGURE 4.
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