韌體
AFE4300
- Weight-scale front-end:
- Supports up to four load cell inputs
- On-chip load cell 1.7-V excitation voltage for ratiometric measurement
- 68-nVrms Input-Referred noise
(0.1 Hz to 2 Hz) - Best-fit linearity: 0.01% of full-scale
- Weight-scale measurement : 540 µA
- Body composition front-end:
- Supports up to three tetra-polar complex impedance measurements
- 6-Bit, 1-MSPS sine-wave generation digital-to-analog converter (DAC)
- 247.5-µArms, ±20% Excitation source
- 0.1-Ω Measurement RMS noise in 2-Hz BW
- Body composition measurement : 970 µA
- Analog-to-digital converter (ADC):
- 16 Bits, 860 SPS
- Supply current: 110 µA
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.
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檢視所有 3 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | AFE4300 Low-Cost, Integrated Analog Front-End for Weight-Scale and Body Composition Measurement datasheet | PDF | HTML | 2019年 8月 16日 |
| Application note | Impedance Measurement with AFE4300 | 2013年 10月 9日 | ||
| EVM User's guide | AFE4300EVM-PDK User's Guide (Rev. A) | 2012年 8月 29日 |
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開發板
AFE4300EVM-PDK — AFE4300 體重計和身體成分量測 AFE 性能展示套件 (PDK)
AFE4300EVM-PDK is a platform for evaluating the AFE4300 device. AFE4300 is a low cost Analog-Front-End incorporating two separate signal chains, one targeting weight measurement and the other targeting body composition analysis. The EVM provides access for load cell terminals to support up to four (...)
使用指南: PDF
模擬工具
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
| 封裝 | 引腳 | 下載 |
|---|---|---|
| LQFP (PN) | 80 | 檢視選項 |
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