Low Cost, Low Power
Video Op Amp
AD818
FEATURES
Low Cost
Excellent Video Performance
55 MHz 0.1 dB Bandwidth (Gain = +2)
0.01% and 0.05؇ Differential Gain and Phase Errors
High Speed
130 MHz Bandwidth (3 dB, G = +2)
100 MHz Bandwidth (3 dB, G+ = –1)
500 V/s Slew Rate
80 ns Settling Time to 0.01% (VO = 10 V Step)
High Output Drive Capability
50 mA Minimum Output Current
Ideal for Driving Back Terminated Cables
Flexible Power Supply
Specified for Single (+5 V) and Dual (؎5 V to ؎15 V)
Power Supplies
Low Power: 7.5 mA Max Supply Current
Available in 8-Lead SOIC and 8-Lead PDIP
GENERAL DESCRIPTION
The AD818 is a low cost video op amp optimized for use in
video applications that require gains equal to or greater than +2
or –1. The AD818’s low differential gain and phase errors,
single supply functionality, low power, and high output drive
make it ideal for cable driving applications such as video
cameras and professional video equipment.
With video specs like 0.1 dB flatness to 55 MHz and low differential gain and phase errors of 0.01% and 0.05∞, along with
50 mA of output current, the AD818 is an excellent choice for
CONNECTION DIAGRAM
8-Lead Plastic Mini-DIP (N) and SOIC (R) Packages
NULL
1
–IN
8
NULL
2
7
+VS
+IN
3
6
OUTPUT
–VS
4
5
NC
AD818
TOP VIEW
NC = NO CONNECT
any video application. The 130 MHz 3 dB bandwidth (G = +2)
and 500 V/ms slew rate make the AD818 useful in many high speed
applications including video monitors, CATV, color copiers,
image scanners, and fax machines.
The AD818 is fully specified for operation with a single +5 V
power supply and with dual supplies from ± 5 V to ± 15 V. This
power supply flexibility, coupled with a very low supply current
of 7.5 mA and excellent ac characteristics under all power supply conditions, make the AD818 the ideal choice for many
demanding yet power sensitive applications.
The AD818 is a voltage feedback op amp and excels as a gain
stage in high speed and video systems (gain ≥ 2, or gain £ –1). It
achieves a settling time of 45 ns to 0.1%, with a low input offset
voltage of 2 mV max.
+15V
0.01F
0.02
2.2F
DIFF GAIN
0.01
AD818
75⍀
RT
75⍀
0.1F
2.2F
–15V
1k⍀
1k⍀
DIFFERENTIAL PHASE (Degrees)
RBT
75⍀
VIN
0.00
0.06
DIFFERENTIAL GAIN (%)
The AD818 is available in low cost, small 8-lead PDIP and
SOIC packages.
0.05
DIFF PHASE
0.04
0.03
5
10
SUPPLY VOLTAGE (؎V)
15
Figure 1. Video Line Driver
Figure 2. Differential Gain and Phase vs. Supply
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781.461-3113
©2010 Analog Devices, Inc. All rights reserved.
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