MAX30002 datasheet(13/44 Pages) MAXIM

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Detailed Description

BioZ Channel

Figure 2 illustrates the BioZ channel block diagram,

excluding the ADC. The channel comprises an input

MUX, a programmable analog high-pass filter, an

instrumentation amplifier, a mixer, an anti-alias filter,

and a programmable gain amplifier. The MUX includes

several features such as ESD protection, EMI filtering,

lead biasing, leads off checking, and ultra-low-power

leads-on checking. The output of this analog channel

drives a high-resolution ADC.

Input MUX

The BioZ input MUX shown in Figure 3 contains integrated

ESD and EMI protection, DC leads off detect current

sources and comparators, lead-on detect, series isolation

switches, lead biasing, and a built-in programmable

resistor load, for self test.

EMI Filtering and ESD Protection

EMI filtering of the BIP and BIN inputs consists of a single

pole, low pass, differential, and common mode filter with

the pole located at approximately 2MHz. The BIP and BIN

inputs also have input clamps that protect the inputs from

ESD events. The DRVP and DRVN outputs also feature

ESD protection.

● ±8kV using the Contact Discharge method specified

in IEC61000-4-2 ESD.

● ±15kV using the Air Gap Discharge method specified

in IEC61000-4-2 ESD.

● ±8kV HMM

For IEC61000-4-2 ESD protection, use 1kΩ or larger

series resistors on BIP, BIN, DRVP, and DRVN that are

rated to withstand the appropriate surge voltages.

Figure 2. BioZ Channel Input Amplifier, Mixer, and PGA Excluding the ADC and Current Drive Output

ESD, EMI,

INPUT MUX,

DC LEAD

CHECK

INPUT

AMP

AAF

BIP

BIN

DRVP

DRVN

PGA

PUSH/PULL

CURRENT

SOURCE

HPF

-20dB/dec

f-3dB

=600Hz

-40dB/dec

SELECTABLE PHASE

MAX30002

PCB

MAX30002

Ultra-Low-Power, Single-Channel Integrated

Bioimpedance (BioZ) AFE

www.maximintegrated.com

Maxim Integrated │ 13

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