ANALOG DEVICES AD829 Service Manual
Video Op Amp
AD829
Rev. I
rights of third parties that may result from its use. Specifications subject to change without notice. No
Trademarks and registered trademarks are the prop erty of their respective owner s.
Fax: 781.461.3113 ©2011 Analog Devices, Inc. All rights reserved.
AD829
TOP VIEW
(Not to Scale)
OFFSET NULL
1
–IN
2
+IN
3
–V
S
4
OFFSET NULL
+V
S
OUTPUT
C
COMP
8
7
6
5
00880-001
00880-002
20 19123
18
14
15
16
17
4
5
6
7
8
9 10 11 12 13
NC
+V
NC
OUTPUT
NC
NC = NO CONNECT
NC
NC
NC
–V
NC
C
COMP
NC
OFFSET
NULL
OFFSET
NULL
NC
–IN
NC
+IN
NC
NC
AD829
TOP VIEW
(Not to Scale)
Data Sheet
FEATURES
High speed
120 MHz bandwidth, gain = −1
230 V/µs 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 maximum input offset voltage (over temperature)
0.3 µV/°C input offset drift
Flexible operation
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
Available in tape and reel in accordance with EIA-481A standard
GENERAL DESCRIPTION
The"% 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 >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.
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
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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. 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.
2. 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).
3. The AD829 can drive heavy capacitive loads.
4. Performance is fully specified for operation from ±5 V
to ±15 V supplies.
5. Th
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).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
High Speed, Low Noise
CONNECTION DIAGRAM
Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R)
Figure 2. 20-Terminal LCC
9 is available in PDIP, CERDIP, and small outline
e AD82
AD829 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Connection Diagram ....................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 5
Thermal Characteristics .............................................................. 5
Metallization Photo ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
REVISION HISTORY
10/11—Rev. H to R e v. I
Change to Tab le 2 ............................................................................. 5
4/09—Re
Changes to Features .......................................................................... 1
Changes to Quiescent Current Parameter, Table 1 ...................... 4
Changes to Ta ble 2 ............................................................................ 5
Added Thermal Characteristics Section and Table 3 .................. 5
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 19
4/04—R
Added Figure 1; Renumbered Sequentially .................................. 4
Changes to Ordering Guide ............................................................ 5
Updated Table I ............................................................................... 11
Updated Figure 15 .......................................................................... 12
Updated Figure 16 .......................................................................... 13
Updated Outline Dimensions ....................................................... 14
v. G to Rev. H
ev. F to R e v. G
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—Re
Renumbered Figures ......................................................... Universal
Changes to Product Highlights ....................................................... 1
Changes to Specifications ................................................................. 2
Changes to Absolute Maximum Ratings ........................................ 4
Changes to Ordering Guide ............................................................. 4
Updated Outline Dimensions ....................................................... 13
v. E to Re v. F
Rev. I | Page 2 of 20
Data Sheet AD829
VO = 20 V p-p,
±15 V
3.6
3.6
3.6 MHz
COMMON-MODE REJECTION
VCM = ±2.5 V
±5 V
100
120 100
120 100
120 dB
POWER SUPPLY REJECTION
98
120 98
120 98
120 dB
SPECIFICATIONS
TA = 25°C and VS = ±15 V dc, unless otherwise noted.
Table 1.
AD829JR AD829AR AD829AQ/AD829S
Parameter Conditions VS Min Typ Max Min Typ Max Min Typ Max Unit
INPUT OFFSET VOLTAGE t
Offset Voltage Drift
INPUT BIAS CURRENT
t
INPUT OFFSET CURRENT
t
Offset Current Drift
OPEN-LOOP GAIN
RL = 150 Ω 40 40 40 V/mV
t
RL = 500 Ω 85 85 85 V/mV
t
DYNAMIC PERFORMANCE
Gain Bandwidth Product ±5 V 600 600 600 MHz
±15 V 750 750 750 MHz
Full Power Bandwidth
1, 2
to t
MIN
to t
MIN
to t
MIN
= ±2.5 V,
V
O
= 500 Ω
R
L
to t
MIN
= ±10 V,
V
O
= 1 kΩ
R
L
to t
MIN
= 2 V p-p,
V
O
= 500 Ω
R
L
MAX
±5 V,
0.2 1
0.2 1
0.1 0.5 mV
±15 V
±5 V,
1
0.3 0.3 0.3 µV/°C
1
0.5 mV
±15 V
±5 V,
3.3 7 3.3 7 3.3 7 µA
±15 V
8.2 9.5 9.5 µA
MAX
±5 V,
50 500 50 500 50 500 nA
±15 V
500 500 500 nA
MAX
± 5 V,
0.5 0.5 0.5 nA/°C
±15 V
±5 V 30 65 30 65 30 65 V/mV
20 20 20 V/mV
MAX
±15 V 50 100 50 100 50 100 V/mV
20 20 20 V/mV
MAX
±5 V 25 25 25 MHz
RL = 1 kΩ
Slew Rate2 RL = 500 Ω ±5 V 150 150 150 V/µs
RL = 1 kΩ ±15 V 230 230 230 V/µs
Settling Time to 0.1% AV = –19
−2.5 V to
±5 V 65 65 65 ns
+2.5 V
10 V step ±15 V 90 90 90 ns
Phase Margin2 CL = 10 pF ±15 V
RL = 1 kΩ 60 60 60 Degrees
DIFFERENTIAL GAIN ERROR3
DIFFERENTIAL PHASE ERROR3
= 100 Ω,
R
L
= 30 pF
C
COMP
= 100 Ω,
R
L
= 30 pF
C
COMP
±15 V 0.02 0.02 0.02 %
±15 V 0.04 0.04 0.04 Degrees
VCM = ±12 V ±15 V 100 120 100 120 100 120 dB
t
MIN
to t
96 96 96 dB
MAX
VS = ±4.5 V
to ±18 V
t
MIN
to t
94 94 94 dB
MAX
INPUT VOLTAGE NOISE f = 1 kHz ±15 V 1.7 2 1.7 2 1.7 2 nV/√Hz
INPUT CURRENT NOISE f = 1 kHz ±15 V 1.5 1.5 1.5 pA/√Hz
Rev. I | Page 3 of 20
AD829 Data Sheet
±15 V
5.3
6.8 5.3
6.8 5.3
6.8
mA
AD829JR AD829AR AD829AQ/AD829S
Parameter Conditions VS Min Typ Max Min Typ Max Min Typ Max Unit
INPUT COMMON-MODE
VOLTAGE RANGE
−3.8 −3.8 −3.8 V
±15 V +14.3 +14.3 +14.3 V
−13.8 −13.8 −13.8 V
OUTPUT VOLTAGE SWING RL = 500 Ω ±5 V ±3.0 ±3.6 ±3.0 ±3.6 ±3.0 ±3.6 V
RL = 150 Ω ±5 V ±2.5 ±3.0 ±2.5 ±3.0 ±2.5 ±3.0 V
RL = 50 Ω ±5 V ±1.4 ±1.4 ±1.4 V
RL = 1 kΩ ±15 V ±12 ±13.3 ±12 ±13.3 ±12 ±13.3 V
RL = 500 Ω ±15 V ±10 ±12.2 ±10 ±12.2 ±10 ±12.2 V
Short-Circuit Current
INPUT CHARACTERISTICS
Input Resistance
(Differential)
Input Capacitance
(Differential)
4
Input Capacitance
(Common Mode)
CLOSED-LOOP OUTPUT
RESISTANCE
POWER SUPPLY
Operating Range ±4.5 ±18 ±4.5 ±18 ±4.5 ±18 V
Quiescent Current ±5 V 5 6.5 5 6.5 5 6.5 mA
t
±5 V +4.3 +4.3 +4.3 V
±5 V,
32 32 32 mA
±15 V
13 13 13 kΩ
5 5 5 pF
1.5 1.5 1.5 pF
AV = +1,
2 2 2 mΩ
f = 1 kHz
to t
MIN
8.0 8.0 8.7 mA
MAX
t
TRANSISTOR COUNT
to t
MIN
MAX
Number of
8.3 9.0 9.0 mA
46 46 46
transistors
1
Full power bandwidth = slew rate/2 π V
2
Tested at gain = 20, C
3
3.58 MHz (NTSC) and 4.43 MHz (PAL and SECAM).
4
Differential input capacitance consists of 1.5 pF package capacitance plus 3.5 pF from the input differential pair.
COMP
= 0 pF.
PEAK
.
Rev. I | Page 4 of 20
Data Sheet AD829
Internal Power Dissipation1
Output Short-Circuit Duration
Indefinite
AD829A
−40°C to +125°C
8-Lead PDIP (N)
100 (derates at 8.7 mW/°C)
°C/W
–IN
OFFSET NULL
OFFSET NULL
+IN
00880-004
AMBIENT TEMPERATURE (°C)
MAXIMUM POWER DISSIPATION (W)
–55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115
0
0.5
1.0
1.5
2.0
2.5
125
CERDIP
SOIC
PDIP
LCC
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage ±18 V
8-Lead PDIP (N) 1.3 W
8-Lead SOIC (R) 0.9 W
8-Lead CERDIP (Q) 1.3 W
20-Terminal LCC (E) 0.8 W
Differential Input Voltage2 ±6 V
Storage Temperature Range
8-Lead CERDIP (Q) and 20-Terminal LCC (E) −65°C to +150°C
8-Lead PDIP (N) and 8-Lead SOIC (R) −65°C to +125°C
Operating Temperature Range
AD829J 0°C to 70°C
AD829S −55°C to +125°C
Lead Temperature (Soldering, 60 sec) 300°C
1
Maximum internal power dissipation is specified so that TJ does not exceed
150°C at an ambient temperature of 25°C.
2
If the differential voltage exceeds 6 V, external series protection resistors
should be added to limit the input current.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
METALLIZATION PHOTO
1
2
3
0.067 (1.70)
SUBSTRATE CONNECTED TO + V
Figure 3. Metallization Photo; Contact Factory for Latest Dimensions,
Dimensions Shown in Inches and (Millimeters)
8
S
+V
S
7
OUTPUT
6
C
COMP
5
–V
S
4
0.054
(1.37)
00880-003
THERMAL CHARACTERISTICS
Table 3.
Package Type θJA Unit
8-Lead CERDIP (Q) 110 (derates at 8.7 mW/°C) °C/W
20-Lead LCC (E) 77 °C/W
8-Lead SOIC (R) 125 (derates at 6 mW/°C) °C/W
Figure 4. Maximum Power Dissipation vs. Temperature
ESD CAUTION
Rev. I | Page 5 of 20
AD829 Data Sheet
00880-005
SUPPLY VOLTAGE (±V)
INPUT COMMON-MODE RANGE (V)
0 5 10 15
0
5
10
15
20
20
+V
OUT
–V
OUT
00880-006
SUPPLY VOLTAGE (±V)
MAGNITUDE OF THE OUTPUT VOLTAGE (V)
0 5 10 15
0
5
10
15
20
20
+V
OUT
–V
OUT
RL = 1kΩ
00880-007
LOAD RESISTANCE (Ω)
OUTPUT VOLTAGE SWING (V p-p)
10 100 1k
0
5
10
25
20
15
30
10k
±15V
SUPPLIES
±5V
SUPPLIES
00880-008
SUPPLY VOLTAGE (±V)
QUIESCENT CURRENT (mA)
0 5 10 15
4.0
4.5
5.0
5.5
6.0
20
00880-009
TEMPERATURE (°C)
INPUT BIAS CURRENT (µA)
–60 –40 –20 0 20 40 60 80 100 120
–2
–3
–4
–5
140
V
S
= ±5V, ±15V
00880-010
FREQUENCY (Hz)
CLOSED-LOOP OUTPUT IMPEDANCE (Ω)
1k 10k 100k 1M 10M
0.001
0.01
0.1
1
10
100
100M
AV = 20
C
COMP
= 0pF
A
V
= 1
C
COMP
= 68pF
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. Input Common-Mode Range vs. Supply Voltage
Figure 6. Output Voltage Swing vs. Supply Voltage
Figure 8. Quiescent Current vs. Supply Voltage
Figure 9. Input Bias Current vs. Temperature
Figure 7. Output Voltage Swing vs. Resistive Load
Figure 10. Closed-Loop Output Impedance vs. Frequency
Rev. I | Page 6 of 20
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