AD630

a 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 Balanced Modulator/Demodulator AD630 FUNCTIONAL BLOCK DIAGRAM CM OFF ADJ 6 CM OFF ADJ 5 DIFF OFF ADJ 4 DIFF OFF ADJ 3 2.5k⍀ RINA 1 CHA+ 2 CHA– 20 2.5k⍀ RINB 17 CHB+ 18 CHB– 19 –V AMP B 13 AMP A AD630 12 COMP +VS VOUT RB RF RA CHANNEL STATUS B/A A 11 B 10k⍀ 10k⍀ 14 15 5k⍀ PRODUCT DESCRIPTION 16 The AD630 is a high precision balanced modulator which combines a flexible commutating architecture with the accuracy and temperature 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 his own high gain or complex switched feedback topologies. The AD630 may be thought of as a precision op amp with two independent differential input stages and a precisi...