CDB5376 Datasheet, PDF (16/78 Pages) Cirrus Logic – Multichannel Seismic Evaluation System

CDB5376
Land Common Mode Filter Specification
Common Mode Capacitance
Common Mode Resistance
Common Mode -3 dB Corner @ 6 dB/octave
Land Differential Filter Specification
Differential Capacitance
Differential Resistance
Differential -3 dB Corner @ 6 dB/octave
Value
10 nF + 10%
200 Ω
80 kHz + 10%
Value
10 nF + 10%
200 Ω + 200 Ω = 400 Ω
40 kHz + 10%
Marine Differential Filter Specification
Differential Capacitance
Differential Resistance
-3 dB Corner @ 6 dB/octave
Value
10 nF + 10%
200 Ω + 200 Ω = 400 Ω
40 kHz + 10%
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.
Specification
Geophone Sensor Bias Resistance
Hydrophone Sensor Bias Resistance
Value
20 kΩ || 20 kΩ = 10 kΩ
18 MΩ || 18 MΩ = 9 MΩ
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DS612DB2