High Speed, Low Noise
Video Op Amp
AD829
FEATURES
High Speed
120 MHz Bandwidth, Gain = –1
230 V/ s Slew Rate
90 ns Settling Time to 0.1%
Ideal for Video Applications
0.02% Differential Gain
0.04 Differential Phase
Low Noise
1.7 nV/√Hz Input Voltage Noise
1.5 pA/√Hz Input Current Noise
Excellent DC Precision
1 mV Max Input Offset Voltage (Over Temp)
0.3 mV/ C Input Offset Drift
Flexible Operation
Specified for 5 V to 15 V Operation
3 V Output Swing into a 150 Load
External Compensation for Gains 1 to 20
5 mA Supply Current
Available in Tape and Reel in Accordance with
EIA-481A Standard
GENERAL DESCRIPTION
CONNECTION DIAGRAMS
8-Lead
PDIP(N), Cerdip (Q), and SOIC (R) Packages
OFFSET NULL
1
–IN
2
+IN
3
–V
S 4
AD829
8
OFFSET NULL
7
6
+V
S
OUTPUT
TOP VIEW
5
C
COMP
(Not to Scale)
20-Lead LCC Pinout
NC
OFFSET
NULL
NC
OFFSET
NULL
NC
3
NC 4
–IN 5
NC 6
+IN 7
NC 8
2
1 20 19
18 NC
AD829
TOP VIEW
(Not to Scale)
17 +V
16 NC
15 OUTPUT
14 NC
9 10 11 12 13
The AD829 is a low noise (1.7 nV/√Hz), high speed op amp
with custom compensation that provides the user with gains of
±
1 to
±
20 while maintaining a bandwidth greater than 50 MHz.
The AD829’s 0.04° differential phase and 0.02% differential
gain performance at 3.58 MHz and 4.43 MHz, driving reverse-
terminated 50
Ω
or 75
Ω
cables, makes it ideally suited for
professional video applications. The AD829 achieves its 230 V/µs
uncompensated slew rate and 750 MHz gain bandwidth while
requiring only 5 mA of current from power supplies.
The AD829’s external compensation pin gives it exceptional
versatility. For example, compensation can be selected to
optimize the bandwidth for a given load and power supply voltage.
As a gain-of-two line driver, the –3 dB bandwidth can be increased
to 95 MHz at the expense of 1 dB of peaking. The AD829’s
output can also be clamped at its external compensation pin.
The AD829 exhibits excellent dc performance. It offers a mini-
mum open-loop gain of 30 V/mV into loads as low as 500
Ω,
low input voltage noise of 1.7 nV/√Hz, and a low input offset
voltage of 1 mV maximum. Common-mode rejection and power
supply rejection ratios are both 120 dB.
This op amp is also useful in multichannel, high speed data
conversion where its fast (90 ns to 0.1%) settling time is impor-
tant. In such applications, the AD829 serves as an input buffer
for 8-bit to 10-bit A/D converters and as an output I/V con-
verter for high speed DACs.
REV. G
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 owners.
NC = NO CONNECT
Operating as a traditional voltage feedback amplifier, the AD829
provides many of the advantages a transimpedance amplifier
offers. A bandwidth greater than 50 MHz can be maintained for
a range of gains through the replacement of the external com-
pensation capacitor. The AD829 and the transimpedance
amplifier are both unity gain stable and provide similar voltage
noise performance (1.7 nV/√Hz); however, the current noise of
the AD829 (1.5 pA/√Hz) is less than 10% of the noise of
transimpedance amps. The inputs of the AD829 are symmetrical.
PRODUCT HIGHLIGHTS
1. Input voltage noise of 2 nV/√Hz, current noise of 1.5 pA/√Hz,
and 50 MHz bandwidth, for gains of 1 to 20, make the AD829
an ideal preamp.
2. Differential phase error of 0.04° and a 0.02% differential
gain error, at the 3.58 MHz NTSC and 4.43 MHz PAL and
SECAM color subcarrier frequencies, make the op amp an
outstanding video performer for driving reverse-terminated
50
Ω
and 75
Ω
cables to
±
1 V (at their terminated end).
3. The AD829 can drive heavy capacitive loads.
4. Performance is fully specified for operation from
±
5 V to
±
15 V supplies.
5. The AD829 is available in plastic, CERDIP, and small outline
packages. Chips and MIL-STD-883B parts are also available.
The SOIC-8 package is available for the extended tempera-
ture range of –40°C to +125°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© 2004 Analog Devices, Inc. All rights reserved.
NC
C
COMP
NC
NC
–V
AD [ ANALOG DEVICES ]
