ADX921 Overview
Description
The ADX920/1/2/3 devices are multichannel, simultaneous sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADX920/1/2/3 devices incorporate all features common.
Key Features
- Three low-noise (ADX923) PGAs and two highresolution ADCs (ADX922/3)
- Input-referred noise: 8.6μVPP (G =
- Input bias current: 100pA
- Data rate: 125SPS to 8kSPS
- CMRR: 117dB; THD: –107dB
- Supplies: unipolar or bipolar Analog: 2.7V to 5.5V Digital: 1.65V to 3.6V
- Built-in right leg drive amplifier, lead-off detection, test signals
- Integrated respiration impedance measurement (ADX922/3)
- Electrode Rotation mode (ERM) to implement time-division multiplexing LEAD-I, LEAD-II, and LEAD-III measurements (ADX923)
- Integrated digital AC lead-off measurement and software AC lead-off measurement (ADX922/3)
