AFE4300

SBAS586B – JUNE 2012 – REVISED JUNE 2013

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ELECTRICAL CHARACTERISTICS: Body Composition Measurement Front-End

Over operating free-air temperature range, AVDD – AVSSS = 3 V, unless otherwise noted.

AFE4300

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

WAVEFORM GENERATOR

DAC resolution

6

Bits

DAC full-scale voltage

Common mode voltage = 0.9 V

1

DAC sample rate

1

MSPS

–3 dB bandwidth of the 2nd-order low-pass

150 ±30

kHz

filter

R1

Internal current-setting resistor

1.5 ±20%

k

Ω

DEMODULATION CHAIN

Input Impedance

50

k

Ω

From impedance to dc output of

Gain

0.72

V/k

Ω

demodulator, IQ Mode & FWR mode

Gain error (without calibration)

FWR mode and I/Q mode

2.5

% of FS

Offset error (without calibration)

FWR mode and I/Q mode

±5

mV

CMRR

Common-mode rejection ratio

75

dB

0

Ω to 1.25 kΩ range

0.15

% of FS

Nonlinearity

0

Ω to 2.50 kΩ range

3

% of FS

Internal resistor = 5 k

Ω,

Rectifier bandwidth

3.5 ±20%

Hz

external capacitor = 4.7 µF

20-kHz waveform, noise integrated from

Output noise at rectifier output

15

µVrms

0.01 Hz to 2 Hz

4

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