High Speed, Low Noise
Video Op Amp
Data Sheet
AD829
FEATURES CONNECTION DIAGRAM
High speed OFFSET NULL 1 8 OFFSET NULL
AD829
IN 2 7 +V
S
120 MHz bandwidth, gain = 1
+IN 3 6 OUTPUT
230 V/s slew rate
V 4 TOP VIEW 5 C
S COMP
(Not to Scale)
90 ns settling time to 0.1%
Ideal for video applications
Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R)
0.02% differential gain
0.04 differential phase
Low noise
3 2 1 20 19
1.7 nV/Hz input voltage noise
4 18 NC
NC
1.5 pA/Hz input current noise
17 +V
IN 5
AD829
Excellent dc precision
NC 6 16 NC
TOP VIEW
(Not to Scale) OUTPUT
7 15
+IN
1 mV maximum input offset voltage (over temperature)
8 14 NC
NC
0.3 V/C input offset drift
9 10 11 12 13
Flexible operation
Specified for 5 V to 15 V operation
NC = NO CONNECT
3 V output swing into a 150 load
Figure 2. 20-Terminal LCC
External compensation for gains 1 to 20
Operating as a traditional voltage feedback amplifier, the AD829
5 mA supply current
provides many of the advantages that a transimpedance amplifier
Available in tape and reel in accordance with EIA-481A standard
offer. A bandwidth >50 MHz can be maintained for a range of
GENERAL DESCRIPTION
gains through the replacement of the external compensation
The is a low noise (1.7 nV/Hz), high speed op amp with
capacitor. The AD829 and the transimpedance amplifier are both
custom compensation that provides the user with gains of 1 to 20
unity-gain stable and provide similar voltage noise performance
while maintaining a bandwidth >50 MHz. Its 0.04 differential
(1.7 nV/Hz); however, the current noise of the AD829
phase and 0.02% differential gain performance at 3.58 MHz and
(1.5 pA/Hz) is less than 10% of the noise of transimpedance
4.43 MHz, driving reverse-terminated 50 or 75 cables, makes
amplifiers. The inputs of the AD829 are symmetrical.
it ideally suited for professional video applications. The AD829
PRODUCT HIGHLIGHTS
achieves its 230 V/s uncompensated slew rate and 750 MHz
1. The input voltage noise of 2 nV/Hz, current noise of
gain bandwidth while requiring only 5 mA of current from
1.5 pA/Hz, and 50 MHz bandwidth for gains of 1 to 20
power supplies.
make the AD829 an ideal preamp.
The external compensation pin of the AD829 gives it
2. A differential phase error of 0.04 and a 0.02% differential
exceptional versatility. For example, compensation can be
gain error, at the 3.58 MHz NTSC, 4.43 MHz PAL, and
selected to optimize the bandwidth for a given load and power
SECAM color subcarrier frequencies, make the op amp an
supply voltage. As a gain-of-2 line driver, the 3 dB bandwidth
outstanding video performer for driving reverse-terminated
can be increased to 95 MHz at the expense of 1 dB of peaking.
50 and 75 cables t o 1 V (at their terminated end).
Its output can also be clamped at its external compensation pin.
3. The AD829 can drive heavy capacitive loads.
The AD829 exhibits excellent dc performance. It offers a minimum
4. Performance is fully specified for operation from 5 V
open-loop gain of 30 V/mV into loads as low as 500 , a low input
to 15 V supplies.
voltage noise of 1.7 nV/Hz, and a low input offset voltage of 1 mV
5. The AD829 is available in PDIP, CERDIP, and small outline
maximum. Common-mode rejection and power supply rejection
packages. Chips and MIL-STD-883B parts are also available.
ratios are both 120 dB.
The 8-lead SOIC is available for the extended temperature
range (40C to +125C).
This op amp is also useful in multichannel, high speed data
conversion where its fast (90 ns to 0.1%) settling time is important.
In such applications, the AD829 serves as an input buffer for 8-bit to
10-bit ADCs and as an output I/V converter for high speed DACs.
Rev. I
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NC
NC
OFFSET
V
NULL
NC
NC
OFFSET
C
COMP
NULL
NC NC
00880-002
00880-001
%AD829 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1 Test Circuits ..................................................................................... 11
General Description ......................................................................... 1 Theory of Operation ...................................................................... 12
Connection Diagram ....................................................................... 1 Externally Compensating the AD829 ...................................... 12
Product Highlights ........................................................................... 1 Shunt Compensation ................................................................. 12
Revision History ............................................................................... 2 Current Feedback Compensation ............................................ 13
Specifications ..................................................................................... 3 Low Error Video Line Driver ................................................... 15
Absolute Maximum Ratings ............................................................ 5 High Gain Video Bandwidth, 3-Op-Amp Instrumentation
Amplifier ..................................................................................... 16
Thermal Characteristics .............................................................. 5
Outline Dimensions ....................................................................... 17
Metallization Photo ...................................................................... 5
Ordering Guide .......................................................................... 19
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
10/11Rev. H to Rev. I 2/03Rev. E to Rev. F
Change to Table 2 ............................................................................. 5 Renumbered Figures ......................................................... Universal
Changes to Product Highlights ....................................................... 1
4/09Rev. G to Rev. H Changes to Specifications ................................................................. 2
C hanges to Features .......................................................................... 1 Changes to Absolute Maximum Ratings ........................................ 4
Changes to Quiescent Current Parameter, Table 1 ...................... 4 Changes to Ordering Guide ............................................................. 4
C hanges to Table 2 ............................................................................ 5 Updated Outline Dimensions ....................................................... 13
A dded Thermal Characteristics Section and Table 3 .................. 5
Updated Outline Dimensions ....................................................... 17
C hanges to Ordering Guide .......................................................... 19
4/ 04Rev. F to Rev. G
Added Figure 1; Renumbered Sequentially .................................. 4
C hanges to Ordering Guide ............................................................ 5
Updated Table I ............................................................................... 11
U pdated Figure 15 .......................................................................... 12
U pdated Figure 16 .......................................................................... 13
Updated Outline Dimensions ....................................................... 14
Rev. I | Page 2 of 20