AD829 Analog Devices, AD829 Datasheet

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AD829

Manufacturer Part Number
AD829
Description
High Speed, Low Noise Video Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD829

-3db Bandwidth
120MHz
Slew Rate
230V/µs
Vos
200µV
Ib
3.3µA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
1.7nV/rtHz
Vcc-vee
9V to 36V
Isy Per Amplifier
6.5mA
Packages
DIP,LCC,SOIC

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Data Sheet
FEATURES
High speed
Ideal for video applications
Low noise
Excellent dc precision
Flexible operation
Available in tape and reel in accordance with EIA-481A standard
GENERAL DESCRIPTION
The
custom compensation that provides the user with gains of 1 to 20
while maintaining a bandwidth >50 MHz. Its 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 external compensation pin of the AD829 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-2 line driver, the −3 dB bandwidth
can be increased to 95 MHz at the expense of 1 dB of peaking.
Its output can also be clamped at its external compensation pin.
The AD829 exhibits excellent dc performance. It offers a minimum
open-loop gain of 30 V/mV into loads as low as 500 Ω, a 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 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
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. Specifications subject to change without notice. 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.
120 MHz bandwidth, gain = −1
230 V/µs slew rate
90 ns settling time to 0.1%
0.02% differential gain
0.04° differential phase
1.7 nV/√Hz input voltage noise
1.5 pA/√Hz input current noise
1 mV maximum input offset voltage (over temperature)
0.3 µV/°C input offset drift
Specified for ±5 V to ±15 V operation
±3 V output swing into a 150 Ω load
External compensation for gains 1 to 20
5 mA supply current
is a low noise (1.7 nV/√Hz), high speed op amp with
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Operating as a traditional voltage feedback amplifier, the AD829
provides many of the advantages that a transimpedance amplifier
offer. A bandwidth >50 MHz can be maintained for a range of
gains through the replacement of the external compensation
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
amplifiers. The inputs of the AD829 are symmetrical.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
The 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.
A differential phase error of 0.04 and a 0.02% differential
gain error, at the 3.58 MHz NTSC, 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).
The AD829 can drive heavy capacitive loads.
Performance is fully specified for operation from ±5 V
to ±15 V supplies.
The AD829 is available in PDIP, CERDIP, and small outline
packages. Chips and MIL-STD-883B parts are also available.
The 8-lead SOIC is available for the extended temperature
range (−40°C to +125°C).
Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R)
OFFSET NULL
High Speed, Low Noise
CONNECTION DIAGRAM
NC = NO CONNECT
–IN
+IN
NC
NC
NC
Figure 2. 20-Terminal LCC
4
5
6
7
8
–V
+IN
–IN
©2011 Analog Devices, Inc. All rights reserved.
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TOP VIEW
AD829
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TOP VIEW
AD829
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Video Op Amp
8
7
6
5
18
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OFFSET NULL
+V
OUTPUT
C
COMP
NC
+V
NC
OUTPUT
NC
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www.analog.com
AD829

Related parts for AD829

AD829 Summary of contents

Page 1

... This op amp is also useful in multichannel, high speed data conversion where its fast ( 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 Information furnished by Analog Devices is believed to be accurate and reliable ...

Page 2

... Changes to Ordering Guide ............................................................ 5 Updated Table I ............................................................................... 11 Updated Figure 15 .......................................................................... 12 Updated Figure 16 .......................................................................... 13 Updated Outline Dimensions ....................................................... 14 Test Circuits ..................................................................................... 11 Theory of Operation ...................................................................... 12 Externally Compensating the AD829 ...................................... 12 Shunt Compensation ................................................................. 12 Current Feedback Compensation ............................................ 13 Low Error Video Line Driver ................................................... 15 High Gain Video Bandwidth, 3-Op-Amp Instrumentation Amplifier ..................................................................................... 16 Outline Dimensions ....................................................................... 17 Ordering Guide .......................................................................... 19 2/03— ...

Page 3

... AD829 Max Unit 0.5 mV 0.5 mV µV/°C 7 µA 9.5 µA 500 nA 500 nA nA/°C V/mV V/mV V/mV V/mV V/mV V/mV MHz MHz MHz MHz V/µs V/µ Degrees % Degrees dB dB ...

Page 4

... V ±10 ±12.2 32 ±5 V, ± 1.5 2 ±4.5 ±18 ± 6.5 8.0 MAX ±15 V 5.3 6.8 8.3 MAX 46 Rev Page AD829AR AD829AQ/AD829S Min Typ Max Min Typ +4.3 +4.3 −3.8 −3.8 +14.3 +14.3 −13.8 −13.8 ±3.0 ±3.6 ±3.0 ±3.6 ±2.5 ±3.0 ±2.5 ±3.0 ±1.4 ±1.4 ±12 ±13.3 ± ...

Page 5

... Figure 4. Maximum Power Dissipation vs. Temperature °C/W °C/W ESD CAUTION °C/W °C/W Rev Page OFFSET NULL 1 8 0.067 (1.70) S Dimensions Shown in Inches and (Millimeters) PDIP LCC CERDIP SOIC 105 115 AMBIENT TEMPERATURE (°C) AD829 + OUTPUT 6 0.054 (1.37) C COMP 5 – 125 ...

Page 6

... AD829 TYPICAL PERFORMANCE CHARACTERISTICS OUT 10 – SUPPLY VOLTAGE (±V) Figure 5. Input Common-Mode Range vs. Supply Voltage –V OUT SUPPLY VOLTAGE (±V) Figure 6. Output Voltage Swing vs. Supply Voltage 100 LOAD RESISTANCE (Ω) Figure 7 ...

Page 7

... FREQUENCY (Hz) Figure 14. Open-Loop Gain and Phase vs. Frequency = ±15V ± 100 1k LOAD RESISTANCE (Ω) Figure 15. Open-Loop Gain vs. Resistive Load +SUPPLY –SUPPLY 0pF COMP 20 1k 10k 100k 1M 10M FREQUENCY (Hz) AD829 100 PHASE –20 100M 10k 100M ...

Page 8

... AD829 120 100 0pF COMP 20 1k 10k 100k 1M FREQUENCY (Hz) Figure 17. Common-Mode Rejection Ratio (CMRR) vs. Frequency ±15V S = 1kΩ + 0pF COMP ± 500Ω + 0pF COMP INPUT FREQUENCY (MHz) Figure 18. Large Signal Frequency Response ...

Page 9

... Figure 26. Gain-of-2 Follower Small Signal Pulse Response (See Figure 32) 0.03 0.02 100 ±15 Figure 27. Gain-of-20 Follower Large Signal Pulse Response (See Figure 33) 50ns 100 Figure 28. Gain-of-20 Follower Small Signal Pulse Response (See Figure 33) Rev Page 20mV 20ns 2V 50ns 50mV 20ns AD829 ...

Page 10

... AD829 200mV 100 Figure 29. Unity-Gain Inverter Large Signal Pulse Response (See Figure 34) 50ns 100 Figure 30. Unity-Gain Inverter Small Signal Pulse Response (See Figure 34) Rev Page Data Sheet 20mV 20ns ...

Page 11

... COMP 15pF 4 0.1µF –15V Figure 34. Unity-Gain Inverter Connection Rev Page 50Ω CABLE 50Ω TEKTRONIX TYPE 7A24 PREAMP 50Ω FET PROBE TEKTRONIX TYPE 7A24 PREAMP 2kΩ 105kΩ 50Ω CABLE 50Ω TEKTRONIX TYPE 7A24 PREAMP 50Ω AD829 ...

Page 12

... T Figure 35, the AD829 input stage consists of an NPN differential pair in which each transistor operates at a 600 µA collector current. This gives the input devices a high transconductance, which in turn gives the AD829 a low noise figure of 2 nV/√ kHz. 12.5pF +IN –IN 1.2mA ...

Page 13

... V/µs, which is barely enough to provide a full power bandwidth of 50 kHz. The AD829 is especially suited to a form of current feedback compensation that allows for the enhancement of both the full power bandwidth and the slew rate of the amplifier. The voltage gain from the inverting input pin to the compensation pin is large ...

Page 14

... MHz. For example, with and R COMP small signal bandwidth of the AD829 is 10 MHz. Figure 40 shows that the slew rate is in excess of 60 V/µs. As shown in Figure 41, the closed-loop bandwidth is constant for gains of −1 to −4; this is a property of the current feedback amplifiers. ...

Page 15

... Data Sheet Figure 44 and Figure 45 show the closed-loop frequency response of the AD829 for different closed-loop gains and different supply voltages. 15 GAIN = – 2pF COMP 9 GAIN = – 3pF COMP 3 GAIN = – 4pF COMP –3 –6 = ±15V V – 1kΩ ...

Page 16

... AD829 2 2kΩ 1pF R G 210Ω 1pF 2kΩ AD829 20) 5 3pF CIRCUIT GAIN = The input amplifiers operate at a gain of 20, while the output op amp runs at a gain this circuit, the main bandwidth limitation is the gain/bandwidth product of the output amplifier. ...

Page 17

... COMPLIANT TO JEDEC STANDARDS MS-001 Figure 50. 8-Lead Plastic Dual In-Line Package [PDIP] Narrow Body (N-8) Dimensions shown in inches and (millimeters) Rev Page 0.50 (0.0196) 45° 0.25 (0.0099) 1.27 (0.0500) 0.40 (0.0157) 0.325 (8.26) 0.310 (7.87) 0.300 (7.62) 0.195 (4.95) 0.130 (3.30) 0.115 (2.92) 0.014 (0.36) 0.010 (0.25) 0.008 (0.20) 0.430 (10.92) MAX AD829 ...

Page 18

... AD829 0.358 (9.09) 0.342 (8.69) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 0.005 (0.13) 0.055 (1.40) MIN MAX 8 5 0.310 (7.87) 0.220 (5.59 0.100 (2.54) BSC 0.405 (10.29) MAX 0.060 (1.52) 0.200 (5.08) MAX 0.015 (0.38) 0.150 (3.81) ...

Page 19

... AD829JRZ 0°C to 70°C AD829JRZ-REEL 0°C to 70°C AD829JRZ-REEL7 0°C to 70°C AD829AQ −40°C to +125°C AD829SQ −55°C to +125°C AD829SQ/883B −55°C to +125°C 5962-9312901MPA −55°C to +125°C AD829SE/883B −55°C to +125°C 5962-9312901M2A − ...

Page 20

... AD829 NOTES ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00880-0-10/11(I) Rev Page Data Sheet ...

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