AFE4300 Series
Weight-scale and body-composition measurement analog front end (AFE)
Manufacturer: Texas Instruments
Catalog
Weight-scale and body-composition measurement analog front end (AFE)
Key Features
• Weight-scale front-end:Supports up to four load cell inputsOn-chip load cell 1.7-V excitation voltage for ratiometric measurement68-nVrms Input-Referred noise(0.1 Hz to 2 Hz)Best-fit linearity: 0.01% of full-scaleWeight-scale measurement : 540 µABody composition front-end:Supports up to three tetra-polar complex impedance measurements6-Bit, 1-MSPS sine-wave generation digital-to-analog converter (DAC)247.5-µArms, ±20% Excitation source0.1-Ω Measurement RMS noise in 2-Hz BWBody composition measurement : 970 µAAnalog-to-digital converter (ADC):16 Bits, 860 SPSSupply current: 110 µAWeight-scale front-end:Supports up to four load cell inputsOn-chip load cell 1.7-V excitation voltage for ratiometric measurement68-nVrms Input-Referred noise(0.1 Hz to 2 Hz)Best-fit linearity: 0.01% of full-scaleWeight-scale measurement : 540 µABody composition front-end:Supports up to three tetra-polar complex impedance measurements6-Bit, 1-MSPS sine-wave generation digital-to-analog converter (DAC)247.5-µArms, ±20% Excitation source0.1-Ω Measurement RMS noise in 2-Hz BWBody composition measurement : 970 µAAnalog-to-digital converter (ADC):16 Bits, 860 SPSSupply current: 110 µA
Description
AI
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.
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 the 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 LQFP-80 package.
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.
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 the 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 LQFP-80 package.
