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
The AFE4300 can also measure body composition by applying a sinusoidal current into the
body. The sinusoidal current is generated with an internal pattern generator and a 6-bit, 1-MSPS
DAC. A voltage-to-current converter applies this sinusoidal current into the body, between two
terminals. The voltage created across these two terminals as a result of the impedance of the body
is measured back with a differential amplifier, rectified, and its amplitude is extracted and
measured by the 16-bit ADC.
The AFE4300 operates from 2 V to 3.6 V, is specified from 0°C to +70°C, and is available
in a TQFP-80 package.
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