AD630AD Analog Devices Inc, AD630AD Datasheet

MODULATOR / DEMODULATOR IC

AD630AD

Manufacturer Part Number
AD630AD
Description
MODULATOR / DEMODULATOR IC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD630AD

Rf Type
Balanced
Supply Voltage Range
± 5V To �� 16.5V
Rf Ic Case Style
DIP
No. Of Pins
20
Operating Temperature Range
-25°C To +85°C
Peak Reflow Compatible (260 C)
No
Leaded Process Compatible
No
Rohs Status
RoHS non-compliant
Function
Modulator/Demodulator
Frequency
2MHz
Package / Case
20-CDIP (0.300", 7.62mm)
Mounting Type
Through Hole
Rohs Compliant
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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a
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.
REV. E
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.
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
0.05% Closed-Loop Gain Accuracy and Match
100 V Channel Offset Voltage (AD630BD)
350 kHz Full Power Bandwidth
Chips Available
1 and
2
Balanced Modulator/Demodulator
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
PRODUCT HIGHLIGHTS
1. The configuration of the AD630 makes it ideal for signal
2. The application flexibility of the AD630 makes it the best
3. The 100 dB dynamic range of the AD630 exceeds that of any
4. The op amp format of the AD630 ensures easy implementa-
5. The AD630 can be used as a 2-channel multiplexer with
6. The AD630 has pin strappable frequency compensation (no
7. Laser trimming of comparator and amplifying channel offsets
CH A–
CH B–
CH A+
CH B+
SEL B
SEL A
processing applications, such as balanced modulation and
demodulation, lock-in amplification, phase detection, and
square wave multiplication.
choice for applications that require precisely fixed gain,
switched gain, multiplexing, integrating-switching functions,
and high speed precision amplification.
hybrid or IC balanced modulator/demodulator and is compa-
rable to that of costly signal processing instruments.
tion of high gain or complex switched feedback functions.
The application resistors facilitate the implementation of
most common applications with no additional parts.
gains of +1, +2, +3, or +4. The channel separation of
100 dB @ 10 kHz approaches the limit achievable with an
empty IC package.
external capacitor required) for stable operation at unity gain
without sacrificing dynamic performance at higher gains.
eliminates the need for external nulling in most cases.
R
R
IN
IN
A
B
18
19
20
17
10
1
9
2
2.5k
2.5k
FUNCTIONAL BLOCK DIAGRAM
CM OFF
ADJ
6
COMP
AMP A
AMP B
© 2004 Analog Devices, Inc. All rights reserved.
CM OFF
A
ADJ
B
5
DIFF OFF
–V
ADJ
4
–V
8
S
DIFF OFF
10k
ADJ
AD630
3
10k
5k
AD630
www.analog.com
14
15
16
12
11
13
7
R
R
R
COMP
+V
V
CHANNEL
STATUS
B/A
OUT
B
F
A
S

Related parts for AD630AD

AD630AD Summary of contents

Page 1

FEATURES Recovers Signal from 100 dB Noise 2 MHz Channel Bandwidth Slew Rate –120 dB Crosstalk @ 1 kHz Pin Programmable, Closed-Loop Gains of 0.05% Closed-Loop Gain Accuracy and Match 100 V Channel Offset Voltage (AD630BD) ...

Page 2

AD630–SPECIFICATIONS Model Min GAIN Open-Loop Gain 90 ± 1, ± 2 Closed-Loop Gain Error Closed-Loop Gain Match Closed-Loop Gain Drift CHANNEL INPUTS 1 V Operational Limit (–V IN Input Offset Voltage Input Offset Voltage MIN MAX Input ...

Page 3

... Temperature Ranges AD630JN 0°C to 70°C AD630KN 0°C to 70°C AD630AR –25°C to +85°C AD630AR-REEL –25°C to +85°C AD630AD –25°C to +85°C AD630BD –25°C to +85°C AD630SD –55°C to +125°C AD630SD/883B –55°C to +125°C 5962-8980701RA – ...

Page 4

AD630–Typical Performance Characteristics AD630 100pF 100pF 0 1k 10k 100k 1M FREQUENCY (Hz) TPC 1. Output Voltage vs. Frequency 120 100 80 60 ...

Page 5

TOP TRACE BOTTOM TRACE 10k 10k ...

Page 6

AD630 TWO WAYS TO LOOK AT THE AD630 The functional block diagram of the AD630 (see page 1) shows the pin connections of the internal functions. An alternative archi- tectural diagram is shown in Figure 1. In this diagram, the ...

Page 7

The collectors of each switching cell connect to an input trans- conductance stage. The selected cell conveys bias currents i and i to the input stage it controls, causing it to become active. 23 The deselected cell blocks the bias ...

Page 8

AD630 the system input tied and a switching or carrier wave- form applied to the comparator, a low level square wave will appear at the output. The differential offset adjustment potenti- ometers can be used to null ...

Page 9

BALANCED DEMODULATOR The balanced modulator topology described above will also act as a balanced demodulator if a double sideband suppressed carrier waveform is applied to the signal input and the carrier signal is applied to the reference input. The output ...

Page 10

AD630 [ T B. 200mV/DIV 200mV/DIV A. 200mV/DIV Figure 13. AC Bridge Waveforms (1 V Excitation) LOCK-IN AMPLIFIER APPLICATIONS Lock-in amplification is a technique used to separate a small, narrow-band signal from interfering noise. The lock-in amplifier ...

Page 11

Side-Brazed Ceramic Dual In-Line Package [SBDIP] 0.200 (5.08) 0.200 (5.08) 0.125 (3.18) 0.180 (4.57) 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 0.358 (9.09) 0.342 (8.69) REV. E OUTLINE DIMENSIONS (D-20) Dimensions shown in inches and (millimeters) 0.005 (0.13) MIN 0.080 ...

Page 12

AD630 0.30 (0.0118) 0.10 (0.0039) COPLANARITY 0.10 CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN Revision History Location 6/04—Data Sheet changed from REV. D ...

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