Balanced Modulator/Demodulator Data Sheet AD630 FEATURES FUNCTIONAL BLOCK DIAGRAM CM OFF CM OFF DIFF OFF DIFF OFF Recovers signal from 100 dB noise ADJ ADJ ADJ ADJ 2 MHz channel bandwidth 45 V/s slew rate BIAS 2.5k Low crosstalk: 120 dB at 1 kHz, 100 dB at 10 kHz R A IN AMP A Pin programmable, closed-loop gains of 1 and 2 CH A+ COMP 0.05% closed-loop gain accuracy and match CH A +V A +V S S 100 V channel offset voltage (AD630) 2.5k R B IN 350 kHz full power bandwidth V OUT AMP B B 10k CH B+ Chips available 10k V R CH B B 5k APPLICATIONS R A Balanced modulation and demodulation R F Synchronous detection CHANNEL COMP STATUS SEL B Phase detection B/A SEL A Quadrature detection Phase sensitive detection V S Lock in amplification Figure 1. Square wave multiplication Other features of the AD630 include pin programmable frequency GENERAL DESCRIPTION compensation optional input bias current compensation resistors, The AD630 is a high precision balanced modulator/demodulator common-mode and differential-offset voltage adjustment, and a that combines a flexible commutating architecture with the channel status output that indicates which of the two differential accuracy and temperature stability afforded by laser wafer trimmed inputs is active. thin film resistors. A network of on-board applications resistors provides precision closed-loop gains of 1 and 2 with 0.05% PRODUCT HIGHLIGHTS accuracy (AD630B). These resistors may also be used to accurately 1. The application flexibility of the AD630 makes it the best configure multiplexer gains of 1, 2, 3, or 4. External feedback choice for applications that require precisely fixed gain, enables high gain or complex switched feedback topologies. switched gain, multiplexing, integrating-switching The AD630 can be thought of as a precision op amp with two functions, and high speed precision amplification. independent differential input stages and a precision comparator 2. The 100 dB dynamic range of the AD630 exceeds that of that is used to select the active front end. The rapid response any hybrid or IC balanced modulator/demodulator and is time of this comparator coupled with the high slew rate and fast comparable to that of costly signal processing instruments. settling of the linear amplifiers minimize switching distortion. 3. The op amp format of the AD630 ensures easy implementation of high gain or complex switched feedback functions. The The AD630 is used in precision signal processing and instru- application resistors facilitate the implementation of most mentation applications that require wide dynamic range. When common applications with no additional parts. used as a synchronous demodulator in a lock-in amplifier 4. The AD630 can be used as a 2-channel multiplexer with gains configuration, the AD630 can recover a small signal from 100 dB of 1, 2, 3, or 4. The channel separation of 100 dB at 10 kHz of interfering noise (see the Lock-In Amplifier Applications approaches the limit achievable with an empty IC package. section). Although optimized for operation up to 1 kHz, the 5. Laser trimming of the comparator and amplifying channel circuit is useful at frequencies up to several hundred kilohertz. offsets eliminate the need for external nulling in most cases. Rev. G Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20152016 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 00784-001AD630* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS DESIGN RESOURCES View a parametric search of comparable parts. AD630 Material Declaration PCN-PDN Information DOCUMENTATION Quality And Reliability Application Notes Symbols and Footprints AN-214: Ground Rules for High Speed Circuits DISCUSSIONS AN-306: Synchronous System Measures s AN-307: Modem-Circuit Techniques Simplify View all AD630 EngineerZone Discussions. Instrumentation Designs AN-308: Commutating Amp Multiplies Precisely SAMPLE AND BUY AN-349: Keys to Longer Life for CMOS Visit the product page to see pricing options. AN-683: Strain Gage Measurement Using an AC Excitation TECHNICAL SUPPORT AN-924: Digital Quadrature Modulator Gain Data Sheet Submit a technical question or find your regional support number. AD630: Balanced Modulator/Demodulator Data Sheet AD630: Military Data Sheet DOCUMENT FEEDBACK Submit feedback for this data sheet. TOOLS AND SIMULATIONS AD630 SPICE Macro Model This page is dynamically generated by Analog Devices, Inc., and inserted into this data sheet. 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