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Power-on wiring diagram
Note
The module defaults to phase lock function, IN1 is the signal to be detected, IN2 is the synchronization signal, and OUT is output.
The onboard low-pass filter needs to be configured by the user before it can be used. It can be switched by a jumper cap.
Effect test
AD630 is a high-precision balanced modulator with a flexible commutation structure and a thin film resistor adjusted by a laser wafer to provide excellent accuracy and temperature stability. 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. The on-chip application resistor network provides precision closed-loop gains of ±1 and ±2 with an accuracy of 0.05% (AD630B). These resistors can also be used to precisely configure the multiplexer gain: +1, +2, +3, or +4. Alternatively, external feedback can also be used, allowing designers to implement high gain or complex switch feedback topologies.
Square wave modulation
Test diagram
Frequency=1KHz
Ogi
2025-07-13 11:06:44
It is pretty much the AD630 reference design. Well packed. No documentation.
George R.
2024-12-11 11:36:08
I had hope that this unit would actually function as a lock-in amp, using a photodiode and light chopper to create the signal and reference inputs. However I couldn't find a way to make it work properly for a signal with a DC component, i.e., it does not reject the DC as expected. Complicating matters, no instructions are included nor could I find any on the internet. I ended up abandoning this and bought a used "real" lock-in unit from an online source, for not much more $ than it cost to assemble this unit with the required +/- power supply.
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