CDB5376 datasheet(16/78 Pages) CIRRUS

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CDB5376

DS612DB2

2.2.1.6

Common Mode Bias

Differential analog signals into the CS3301/02 amplifiers are required to be biased to the center of the

power supply voltage range, which for bipolar supplies is near ground potential. This common mode bias

voltage is created by buffering the voltage reference, which is nominally +2.5 V relative to the VA- power

supply.

Resistors to create the common mode bias are selected based on the sensor impedance and may need

to be modified from the CDB5376 defaults depending on the sensor to be used. Refer to the recommend-

ed operating bias conditions for the selected sensor, which are available from the sensor manufacturer.

Land Common Mode Filter Specification

Value

Common Mode Capacitance

10 nF + 10%

Common Mode Resistance

200

Ω

Common Mode -3 dB Corner @ 6 dB/octave

80 kHz + 10%

Land Differential Filter Specification

Value

Differential Capacitance

10 nF + 10%

Differential Resistance

200

Ω + 200 Ω = 400 Ω

Differential -3 dB Corner @ 6 dB/octave

40 kHz + 10%

Marine Differential Filter Specification

Value

Differential Capacitance

10 nF + 10%

Differential Resistance

200

Ω + 200 Ω = 400 Ω

-3 dB Corner @ 6 dB/octave

40 kHz + 10%

Specification

Value

Geophone Sensor Bias Resistance

20 k

Ω || 20 kΩ = 10 kΩ

Hydrophone Sensor Bias Resistance

18 M

Ω || 18 MΩ = 9 MΩ

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