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MAXREFDES106# Health Sensor Platform 4.0
Available Options
Table 12. BioZ Receive Configuration Options
Select I-Channel to Enable BioZ Measurement from the In-
Phase Component or Q-Channel to Enable BioZ
Measurement from the Quadrature-Phase Component.
External capacitors can be connected at the MAX86178 BIP
and BIN input paths for high-pass filtering. Enter the value of
these capacitors in the External HPF Capacitor and click
Update HPF to update. This value is required to calculate the
allowable corner frequencies for Analog HPF.
Two filtering options. First, the MAX86178 has an internal HPF,
with corner frequencies ranging from 100Hz to 10,000Hz.
Second, the internal HPF can use the external HPF capacitor
in place of its internal capacitor. The allowable corner
frequencies are automatically calculated based on the external
capacitor value. The analog HPF can be disabled by selecting
the Bypass option. Refer to the MAX86178 data sheet ‘BioZ
Receive Channel’ section for more details. When analog HPR
is enabled, a 100MΩ resistor between the analog HPF
midpoint and VMID_RX is connected by default to increase the
common-mode input impedance. Select CM Resistor Bypass
to bypass this resistor.
Select Low-Power to reduce power consumption. Select
Low-Noise for a lower SNR.
Allows the demodulator clock-phase polarity to be inverted.
This is useful if electrodes are connected with inverted polarity.
Selecting Demodulation Disable disables demodulation and
allows a direct conversion of the differential input voltage
across BIP and BIN.
Sets BioZ receive channel gain by the combined gains of INA
and PGA. There are four gain settings that are selected: 1V/V,
2V/V, 5V/V, and 10V/V.
Sets cutoff frequencies for ‘Digital LPF’ and ‘Digital HPF’ in
BioZ receive channel. The cutoff frequencies for these filters
are automatically calculated based on the BioZ ADC sample
rate.
Selecting INA Chop Enable allows for 16kHz chopping in the
INA.
The BioZ receive channel sample rate is generated by dividing
the output of the PLL mux by the N Divider and ADC OSR.
Selecting respiration mode additionally divides this frequency
by the F divider.
Enable/Disable ‘AC Lead Off’ detection.
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