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 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.
| # Input Channels |
| Vs (Min) (V) |
| Vs (Max) (V) |
| Resolution (Bits) |
| Sample Rate (max) (SPS) |
| Interface |
| Rating |
| Operating Temperature Range (C) |
| Package Size: mm2:W x L (PKG) |
| Package Group |
| AFE4300 |
|---|
| 2 |
| 2 |
| 3.6 |
| 16 |
| 0.86KSPS |
| SPI |
| Catalog |
| 0 to 70 |
| 80LQFP: 196 mm2: 14 x 14(LQFP) |
| LQFP |
| ご注文 |
