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AD630SD883B датащи(PDF) 1 Page - Analog Devices

номер детали AD630SD883B
подробное описание детали  Balanced Modulator/Demodulator
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD630
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. Trademarks and
registered trademarks are the property of their respective owners.
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
© 2004 Analog Devices, Inc. All rights reserved.
REV. E
Balanced Modulator/Demodulator
FUNCTIONAL BLOCK DIAGRAM
CM OFF
ADJ
CM OFF
ADJ
DIFF OFF
ADJ
DIFF OFF
ADJ
6
3
4
5
2.5k
AMP A
2.5k
AMP B
–V
10k
10k
17
5k
8
9
10
COMP
19
18
1
15
7
16
14
13
11
12
RINA
CH A+
CH A–
RINB
CH B+
CH B–
SEL B
SEL A
2
20
COMP
+VS
VOUT
RB
RF
RA
CHANNEL
STATUS
B/A
–VS
AD630
A
B
PRODUCT DESCRIPTION
The AD630 is a high precision balanced modulator that combines
a flexible commutating architecture with the accuracy and tem-
perature stability afforded by laser wafer trimmed thin film
resistors. Its signal processing applications include balanced
modulation and demodulation, synchronous detection, phase
detection, quadrature detection, phase-sensitive detection,
lock-in amplification, and square wave multiplication. A network
of on-board applications resistors provides precision closed-loop
gains of
±1 and ±2 with 0.05% accuracy (AD630B). These
resistors may also be used to accurately configure multiplexer
gains of +1, +2, +3, or +4. Alternatively, external feedback may
be employed, allowing the designer to implement high gain or
complex switched feedback topologies.
The AD630 can be thought of as a precision op amp with two
independent differential input stages and a precision comparator
that is used to select the active front end. The rapid response
time of this comparator coupled with the high slew rate and fast
settling of the linear amplifiers minimize switching distortion. In
addition, the AD630 has extremely low crosstalk between chan-
nels of –100 dB @ 10 kHz.
The AD630 is used in precision signal processing and instru-
mentation applications that require wide dynamic range. When
used as a synchronous demodulator in a lock-in amplifier
configuration, it can recover a small signal from 100 dB of inter-
fering noise (see Lock-In Amplifier Applications section). Although
optimized for operation up to 1 kHz, the circuit is useful at
frequencies up to several hundred kilohertz.
Other features of the AD630 include pin programmable frequency
compensation, optional input bias current compensation resis-
tors, common-mode and differential-offset voltage adjustment,
and a channel status output that indicates which of the two
differential inputs is active. This device is now available to
Standard Military Drawing (DESC) numbers 5962-8980701RA
and 5962-89807012A.
PRODUCT HIGHLIGHTS
1. The configuration of the AD630 makes it ideal for signal
processing applications, such as balanced modulation and
demodulation, lock-in amplification, phase detection, and
square wave multiplication.
2. The application flexibility of the AD630 makes it the best
choice for applications that require precisely fixed gain,
switched gain, multiplexing, integrating-switching functions,
and high speed precision amplification.
3. The 100 dB dynamic range of the AD630 exceeds that of any
hybrid or IC balanced modulator/demodulator and is compa-
rable to that of costly signal processing instruments.
4. The op amp format of the AD630 ensures easy implementa-
tion of high gain or complex switched feedback functions.
The application resistors facilitate the implementation of
most common applications with no additional parts.
5. The AD630 can be used as a 2-channel multiplexer with
gains of +1, +2, +3, or +4. The channel separation of
100 dB @ 10 kHz approaches the limit achievable with an
empty IC package.
6. The AD630 has pin strappable frequency compensation (no
external capacitor required) for stable operation at unity gain
without sacrificing dynamic performance at higher gains.
7. Laser trimming of comparator and amplifying channel offsets
eliminates the need for external nulling in most cases.
FEATURES
Recovers Signal from 100 dB Noise
2 MHz Channel Bandwidth
45 V/ s Slew Rate
–120 dB Crosstalk @ 1 kHz
Pin Programmable, Closed-Loop Gains of
1 and
2
0.05% Closed-Loop Gain Accuracy and Match
100
V Channel Offset Voltage (AD630BD)
350 kHz Full Power Bandwidth
Chips Available


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   Balanced Modulator/Demodulator
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