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AD829 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD829
Beschreibung Low Noise Video Op Amp
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 21 Seiten
AD829 Datasheet, Funktion
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.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
High Speed, Low Noise
Video Op Amp
AD829
CONNECTION DIAGRAM
OFFSET NULL 1
–IN 2
AD829
8 OFFSET NULL
7 +VS
+IN 3
6 OUTPUT
–VS
4
TOP VIEW
(Not to Scale)
5
CCOMP
Figure 1. 8-Lead PDIP (N), CERDIP (Q), and SOIC (R)
NC 4
–IN 5
NC 6
+IN 7
NC 8
3 2 1 20 19
AD829
TOP VIEW
(Not to Scale)
18 NC
17 +V
16 NC
15 OUTPUT
14 NC
9 10 11 12 13
NC = NO CONNECT
Figure 2. 20-Terminal LCC
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. 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).
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
©2011 Analog Devices, Inc. All rights reserved.






AD829 Datasheet, Funktion
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Internal Power Dissipation1
8-Lead PDIP (N)
8-Lead SOIC (R)
8-Lead CERDIP (Q)
20-Terminal LCC (E)
Differential Input Voltage2
Output Short-Circuit Duration
Storage Temperature Range
8-Lead CERDIP (Q) and 20-Terminal LCC (E)
8-Lead PDIP (N) and 8-Lead SOIC (R)
Operating Temperature Range
AD829J
AD829A
AD829S
Lead Temperature (Soldering, 60 sec)
Rating
±18 V
1.3 W
0.9 W
1.3 W
0.8 W
±6 V
Indefinite
−65°C to +150°C
−65°C to +125°C
0°C to 70°C
−40°C to +125°C
−55°C to +125°C
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.
THERMAL CHARACTERISTICS
Table 3.
Package Type
8-Lead PDIP (N)
8-Lead CERDIP (Q)
20-Lead LCC (E)
8-Lead SOIC (R)
θJA
100 (derates at 8.7 mW/°C)
110 (derates at 8.7 mW/°C)
77
125 (derates at 6 mW/°C)
Unit
°C/W
°C/W
°C/W
°C/W
AD829
METALLIZATION PHOTO
OFFSET NULL
1
OFFSET NULL
8
+VS
7
–IN
2
OUTPUT
6
0.054
(1.37)
CCOMP
5
+IN
3 –VS
4
0.067 (1.70)
SUBSTRATE CONNECTED TO +VS
Figure 3. Metallization Photo; Contact Factory for Latest Dimensions,
Dimensions Shown in Inches and (Millimeters)
2.5
2.0 PDIP
1.5
LCC
1.0 CERDIP
SOIC
0.5
0
–55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125
AMBIENT TEMPERATURE (°C)
Figure 4. Maximum Power Dissipation vs. Temperature
ESD CAUTION
Rev. I | Page 5 of 20

6 Page









AD829 pdf, datenblatt
Data Sheet
TEST CIRCUITS
CCOMP
(EXTERNAL)
+VS
5 0.1µF
2
7
AD829 6
4
3+ 8
1 0.1µF
OFFSET
NULL
ADJUST
–VS
Figure 31. Offset Null and External Shunt Compensation Connections
0.1µF
HP8130A
5ns RISE TIME
50Ω
CABLE
50Ω
+15V
CCOMP
15pF
7
3+
5
AD829 6
2
4
–15V
5pF
0.1µF
50Ω
50Ω CABLE
300kΩ
300kΩ
Figure 32. Follower Connection, Gain = 2
TEKTRONIX
TYPE 7A24
PREAMP
50Ω
+15V
HP8130A
5ns RISE TIME
50Ω
CABLE 45Ω
5Ω
100Ω
2
7
AD829
3+
4
–15V
0.1µF
6
1pF
0.1µF
CCOMP = 0pF
FET
PROBE
2kΩ
105kΩ
Figure 33. Follower Connection, Gain = 20
TEKTRONIX
TYPE 7A24
PREAMP
5pF
HP8130A
5ns RISE TIME
50Ω
CABLE
300Ω
50Ω
300Ω
+15V
0.1µF
2
7
AD829 6
3+
4
5 CCOMP
15pF
50Ω
50Ω CABLE
0.1µF
–15V
Figure 34. Unity-Gain Inverter Connection
TEKTRONIX
TYPE 7A24
PREAMP
50Ω
Rev. I | Page 11 of 20
AD829

12 Page





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