This reference design is a fixed-gain amplifier stage for measuring low-amplitude voltage and current inputs accurately over a wide dynamic range using SAR ADC for power measurement applications. Low-amplitude AC voltage from voltage dividers, current transformers or split-core current sensors with a 333-mV output can be accurately measured.
Features
- Op amp-based fixed-gain amplifier stage for voltage and current inputs with output compatible to ADS8688 input range of ±2.56 V, ±5.12 V and ±10.24 V
- Configurations provided:
- Voltage input with resistor divider > 1-MΩ impedance (no external PT required)
- 333-mV AC voltage output-type current sensor interface
- CT secondary input with burden resistor: single-ended and differential
- Onboard programmable reference provided for single-ended measurement applications.