Datasheet > AFE4300

AFE4300

更新时间： 2024-11-07 12:50:35

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
30页	334K
描述
Low-Cost, Integrated Analog Front-End for Weight-Scale and Body Composition Measurement

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AFE4300 数据手册

AFE4300

www.ti.com

SBAS586A –JUNE 2012–REVISED JUNE 2012

Low-Cost, Integrated Analog Front-End

for Weight-Scale and Body Composition Measurement

Check for Samples: AFE4300

FEATURES

DESCRIPTION

The AFE4300 is

low-cost analog front-end

•

Weight-Scale 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.

–

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

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.

–

6-Bit, 1-MSPS Sine-Wave Generation

Digital-to-Analog Converter (DAC)

–

375-µArms, ±20% Excitation Source

Dynamic Range : 0 Ω to 2.8 kΩ

0.1-Ω Measurement RMS Noise in 2-Hz BW

Body Composition measurement : 970 µA

•

Analog-to_Digital Converter (ADC):

–

16 Bits, 860 SPS

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.

Supply current: 110 µA

APPLICATIONS

•

Weight Scales with Body Composition

Measurements

FUNCTIONAL BLOCK DIAGRAM

R_G

CLK

OUTx_FILT

AVDD

VLDO

MUX

INPx

INMx

ó 4

offset

STE

VSENSEPx

VSENSEMx

SDIN

SDOUT

SCLK

RDY

Patient

ESD

ADC

(16bit, 860SPS)

MUX

Full Wave

Rectifier

SPI

MUX

Protection

IOUTPx

I/Q

Demodulator

Patient

Z_s

ESD

Protection

MUX

IOUTMx

0.9V

VDAC_FILT_IN

1.5k +/- 20%

CLK

DAC

(6bit)

DDS

(10bits)

Reference

LDO

VDACOUT

AVSS

AUXx

VREF VLDO

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SPI is a trademark of Motorola Inc..

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...30

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