The AFE4300 is a low-cost analog front-end incorporating two separate signal chains: onechain 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 anexternal resistor, followed by a 6-bit digital-to-analog converter (DAC) for offset correction, anda circuit to drive the external bridge/load cell with a fixed 1.7 V for ratiometricmeasurements.
The AFE4300 can also measure body composition by applying a sinusoidal current into thebody. The sinusoidal current is generated with an internal pattern generator and a 6-bit, 1-MSPSDAC. A voltage-to-current converter applies this sinusoidal current into the body, between twoterminals. The voltage created across these two terminals as a result of the impedance of the bodyis measured back with a differential amplifier, rectified, and the amplitude is extracted andmeasured 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 availablein a LQFP-80 package.