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PDF ( 数据手册 , 数据表 ) AD827

零件编号 AD827
描述 Low Power Dual Op Amp
制造商 Analog Devices
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AD827 数据手册, 描述, 功能
a
High Speed, Low Power
Dual Op Amp
FEATURES
High Speed
50 MHz Unity Gain Stable Operation
300 V/ms Slew Rate
120 ns Settling Time
Drives Unlimited Capacitive Loads
Excellent Video Performance
0.04% Differential Gain @ 4.4 MHz
0.198 Differential Phase @ 4.4 MHz
Good DC Performance
2 mV max Input Offset Voltage
15 mV/8C Input Offset Voltage Drift
Available in Tape and Reel in Accordance with
EIA-481A Standard
Low Power
Only 10 mA Total Supply Current for Both Amplifiers
؎5 V to ؎15 V Supplies
AD827
CONNECTION DIAGRAMS
8-Lead Plastic (N) and Cerdip
(Q) Packages
16-Lead Small Outline
(R) Package
20-Lead LCC (E) Package
PRODUCT DESCRIPTION
The AD827 is a dual version of Analog Devices’ industry-
standard AD847 op amp. Like the AD847, it provides high
speed, low power performance at low cost. The AD827 achieves
a 300 V/µs slew rate and 50 MHz unity-gain bandwidth while
consuming only 100 mW when operating from ± 5 volt power
supplies. Performance is specified for operation using ± 5 V to
± 15 V power supplies.
The AD827 offers an open-loop gain of 3,500 V/V into 500
loads. It also features a low input voltage noise of 15 nV/Hz,
and a low input offset voltage of 2 mV maximum. Common-
mode rejection ratio is a minimum of 80 dB. Power supply
rejection ratio is maintained at better than 20 dB with input
frequencies as high as 1 MHz, thus minimizing noise
feedthrough from switching power supplies.
The AD827 is also ideal for use in demanding video applica-
tions, driving coaxial cables with less than 0.04% differential
gain and 0.19° differential phase errors for 643 mV p-p into a
75 reverse terminated cable.
The AD827 is also useful in multichannel, high speed data
conversion systems where its fast (120 ns to 0.1%) settling time
is of importance. In such applications, the AD827 serves as an
input buffer for 8-bit to 10-bit A/D converters and as an output
amplifier for high speed D/A converters.
APPLICATION HIGHLIGHTS
1. Performance is fully specified for operation using ± 5 V to
± 15 V supplies.
2. A 0.04% differential gain and 0.19° differential phase error at
the 4.4 MHz color subcarrier frequency, together with its low
cost, make it ideal for many video applications.
3. The AD827 can drive unlimited capacitive loads, while its
30 mA output current allows 50 and 75 reverse-
terminated loads to be driven.
4. The AD827’s 50 MHz unity-gain bandwidth makes it an
ideal candidate for multistage active filters.
5. The AD827 is available in 8-lead plastic mini-DIP and cerdip,
20-lead LCC, and 16-lead SOIC packages. Chips and
MIL-STD-883B processing are also available.
REV. C
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002







AD827 pdf, 数据表
AD827
VIDEO LINE DRIVER
The AD827 functions very well as a low cost, high speed line
driver for either terminated or unterminated cables. Figure 23
shows the AD827 driving a doubly terminated cable in a
follower configuration.
+VS
0.1 µF
VIN
1/2
50AD827
RBT
50
RT
50
VOUT
0.1 µF
500
–VS
CC 500
Figure 23. A Video Line Driver
The termination resistor, RT, (when equal to the cable’s
characteristic impedance) minimizes reflections from the far end
of the cable. While operating from ± 5 V supplies, the AD827
maintains a typical slew rate of 200 V/µs, which means it can
drive a ± 1 V, 30 MHz signal into a terminated cable.
Table I. Video Line Driver Performance Summary
VIN*
VSUPPLY
0 dB or ± 500 mV Step
0 dB or ± 500 mV Step
0 dB or ± 500 mV Step
0 dB or ± 500 mV Step
0 dB or ± 500 mV Step
0 dB or ± 500 mV Step
± 15
± 15
± 15
±5
±5
±5
CC
20 pF
15 pF
0 pF
20 pF
15 pF
0 pF
–3 dB BW
23 MHz
21 MHz
13 MHz
18 MHz
16 MHz
11 MHz
Over-
shoot
4%
0%
0%
2%
0%
0%
*–3 dB bandwidth numbers are for the 0 dBm signal input. Overshoot numbers
are the percent overshoot of the 1 V step input.
A back-termination resistor (RBT, also equal to the characteristic
impedance of the cable) may be placed between the AD827
output and the cable input, in order to damp any reflected
signals caused by a mismatch between RT and the cable’s
characteristic impedance. This will result in a flatter frequency
response, although this requires that the op amp supply ± 2 V to
the output in order to achieve a ± 1 V swing at resistor RT.
A HIGH SPEED THREE OP AMP INSTRUMENTATION
AMPLIFIER CIRCUIT
The instrumentation amplifier circuit shown in Figure 24 can
provide a range of gains. Table II details performance.
+VS
0.1µF
–VIN 3 + 1/2 8 1
2 AD827
1k
TRIM FOR
RG OPTIMUM
BANDWIDTH
7 – 15 pF
6 1k
1/2
7
+VIN
5
AD827
+
4 0.1µF
TRIM FOR BEST
SETTLING TIME
2 – 8pF
2k
2k
3pF
2k
+VS
0.1µF
27
6
AD847
3+
4 0.1µF
2k
VOUT
2k
RL
–VS
CIRCUIT GAIN = 2000 + 1
RG
–VS NOTE: PINOUT SHOWN IS FOR MINIDIP PACKAGE
Figure 24. A High Bandwidth Three Op Amp
Instrumentation Amplifier
Table II. Performance Specifications for the
Three Op Amp Instrumentation Amplifier
Gain
1
2
10
100
RG
Open
2k
226
20
Small Signal
Bandwidth
@ 1 V p-p Output
16.1 MHz
14.7 MHz
4.9 MHz
660 kHz
REV. C
–7–














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