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PDF ( 数据手册 , 数据表 ) 5962-9211701MPA

零件编号 5962-9211701MPA
描述 High Speed/ Low Power Dual Op Amp
制造商 Analog Devices
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5962-9211701MPA 数据手册, 描述, 功能
a
High Speed, Low Power
Dual Op Amp
AD827
FEATURES
HIGH SPEED
50 MHz Unity Gain Stable Operation
300 V/s Slew Rate
120 ns Settling Time
Drives Unlimited Capacitive Loads
EXCELLENT VIDEO PERFORMANCE
0.04% Differential Gain @ 4.4 MHz
0.19؇ Differential Phase @ 4.4 MHz
GOOD DC PERFORMANCE
2 mV max Input Offset Voltage
15 V/؇C 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
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.
CONNECTION DIAGRAMS
8-Pin Plastic (N) and Cerdip
(Q) Packages
16-Pin Small Outline
(R) Package
20-Pin LCC (E) Package
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-pin plastic mini-DIP and cerdip,
20-pin LCC, and 16-pin SOIC packages. Chips and MIL-
STD-883B processing are also available.
REV. B
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
which 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: 617/329-4700
Fax: 617/326-8703







5962-9211701MPA pdf, 数据表
AD827
multipliers connected in series. They could also be placed in
parallel with an increase in bandwidth and a reduction in gain.
The gain of the circuit is controlled by VX, which can range
from 0 to 3 V dc. Measurements show that this circuit easily
supplies 2 V p-p into a 100 load while operating from ± 5 V
supplies. The overall bandwidth of the circuit is approximately
7 MHz with 0.5 dB of peaking.
Each half of the AD827 serves as an I/V converter and converts
the output current of one of the two multipliers in the AD539
into an output voltage. Each of the AD539’s two multipliers
contains two internal 6 kfeedback resistors; one is connected
between the CH1 output and Z1, the other between the CH1
output and W1. Likewise, in the CH2 multiplier, one of the
feedback resistors is connected between CH2 and Z2 and the
other is connected between CH2 and Z2. In Figure 25, Z1 and
W1 are tied together, as are Z2 and W2, providing a 3 k
feedback resistor for the op amp. The 2 pF capacitors connected
between the AD539’s W1 and CH1 and W2 and CH2 pins are
in parallel with the feedback resistors and thus reduce peaking
in the VCA’s frequency response. Increasing the values of C3
and C4 can further reduce the peaking at the expense of
reduced bandwidth. The 1.25 mA full-scale output current of
the AD539 and the 3 kfeedback resistor set the full-scale
output voltage of each multiplier at 3.25 V p-p.
Current limiting in the AD827 (typically 30 mA) limits the out-
put voltage in this application to about 3 V p-p across a 100
load. Driving a 50 reverse-terminated load divides this value
by two, limiting the maximum signal delivered to a 50 load to
about 1.5 V p-p, which suffices for video signal levels. The
dynamic range of this circuit is approximately 55 dB and is
primarily limited by feedthrough at low input levels and by the
maximum output voltage at high levels.
Guidelines for Grounding and Bypassing
When designing practical high frequency circuits using the
AD827, some special precautions are in order. Both short
interconnection leads and a large ground plane are needed
whenever possible to provide low resistance, low inductance
circuit paths. One should remember to minimize the effects of
capacitive coupling between circuits. Furthermore, IC sockets
should be avoided. Feedback resistors should be of a low
enough value that the time constant formed with stray circuit
capacitances at the amplifier summing junction will not limit
circuit performance. As a rule of thumb, use feedback resistor
values that are less than 5 k. If a larger resistor value is
necessary, a small (<10 pF) feedback capacitor in parallel with
the feedback resistor may be used. The use of 0.1 µF ceramic
disc capacitors is recommended for bypassing the op amp’s
power supply leads.
8-Pin Mini-DIP (N) Package
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Cerdip (Q) Package
16-Pin SOIC (R) Package
20-Terminal Leadless Ceramic Chip Carrier
(E-20A)
–8– REV. B














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