AD630 Weak Signal Conditioning Balanced Demodulation Phase Sensitive Detector Signal Lock In Phase Amplifier
| Product name | AD630 lock-in amplifier |
| Size | 46mm X 40mm |
| Supply voltage | ±5V-± 18V |
Highlights
This AD630 lock-in amplifier is an integrated OPA627 preamplifier and 4th-order ultra low-pass Butterworth filter, forming a set of lock-in amplification of the smallest system that can detect and extract weak signals, but also available Modulation function to AD630.
Product Details
The AD630 is a high-precision balanced modulator with a flexible commutation structure and offers laser laser wafer-adjusted thin film resistors with excellent accuracy and temperature stability. Its signal processing applications include: balanced modulation and demodulation, synchronous detection, phase detection, quadrature detection, phase sensitive detection, lock amplification, and square wave multiplication. The on-chip resistor network provides precision closed-loop ±1 and ±2 gain with an accuracy of 0.05% (AD630B). These resistors can also be used to accurately configure the multiplexer gain: +1, +2. +3, or +4 Or, external feedback can be used, allowing designers to implement high-gain or complex switching feedback topologies.
Based on the lock-in amplifier structure of AD630, the circuit should include the following parts: input signal, preamplifier, reference signal, band-pass filter, isolator, mutagen, modulator, comparator, buffer amplifier, integrator, etc.
AD630, which is a high-precision balanced modulator, the internal resistors are all high-stability SiCr thin film resistors to ensure the accuracy and stability of its work. Its signal processing applications include balanced modulation and demodulation, and synchronous detection. Phase detection, quadrature detection, phase-sensitive detection, lock-in amplification, and square-wave clean-up. The AD630 can be thought of as integrating two preamplifiers, one as a precision comparator for gating the preamplifier. As a multi-selector switch and an output-stage integrating operational amplifier, it has a high switching speed and a fast and stable linear amplifier. Since the comparator has a fast response time, the switching distortion can be minimized. In addition, there is extremely low channel-to-channel crosstalk. The AD630 is typically used for high-precision signal processing and wide dynamic range instrumentation. In the lock-in amplifier circuit, when it is used as a synchronous demodulator, it can recover weak signals in a 100 dB noise background. The AD630's optimal operating frequency is at 1 kHz.
Chip features
(1) The signal can be recovered from 100 dB noise
(2) Channel bandwidth: 2 MHz
(3) Slew rate: 45V/us
(4) Crosstalk: -120 dB (1 kHz)
(5) Pin-Programmable, Closed-Loop Gain: ±1 and ±2
(6) Closed-loop gain accuracy and matching: 0.05%
(7) Channel Offset Voltage: 100 uV (AD630BD)
(8) 350 kHz full power bandwidth
Phase-locked signal input, IN1 input 1K 100mvpp, IN2 input 1K1Vpp, IN1 and IN2 same-frequency in phase
Phase-locked signal input, IN1 input 1K 100mvpp, IN2 input 1K1Vpp, IN1 and IN2 are 90° out of phase
Phase-locked signal input, IN1 input 1K 100mvpp, IN2 input 1K1Vpp, IN1 and IN2 are 180° out of phase