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Documents AFE4300
SBAS586C – JUNE 2012 – REVISED SEPTEMBER 2017 AFE4300 Low-Cost, Integrated Analog Front-End
for Weight-Scale and Body Composition Measurement
1 Features 3 Description 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. The weight
measurement chain includes an instrumentation
amplifier (INA) with the gain set by an external
resistor, followed by a 6-bit digital-to-analog converter
(DAC) for offset correction, and a circuit to drive the
external bridge/load cell with a fixed 1.7 V for
ratiometric measurements. 1 Weight-Scale Front-End:
– Supports up to Four Load Cell Inputs
– On-Chip Load Cell 1.7-V Excitation Voltage for
Ratiometric Measurement …
