AFE4300
Overview
The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: one chain for weight-scale (WS) measurement and the other for body composition measurement (BCM) analysis. A 16-bit, 860-SPS analog-to-digital converter (ADC) is multiplexed between both chains.
- 1 Weight-scale front-end: - Supports up to four load cell inputs - On-chip load cell 1.7-V excitation voltage for ratiometric measurement - 68-nVrms Input-Referred noise (0.1 Hz to 2 Hz) - Best-fit linearity: 0.01% of full-scale - Weight-scale measurement : 540 µA
- Body composition front-end: - Supports up to three tetra-polar complex impedance measurements - 6-Bit, 1-MSPS sine-wave generation digital-toanalog converter (DAC) - 247.5-µArms, ±20% Excitation source - 0.1-Ω Measurement RMS noise in 2-Hz BW - Body composition measurement : 970 µA
- Analog-to-digital converter (ADC): - 16 Bits, 860 SPS - Supply current: 110 µA
