CRD-5376 Cirrus Logic Inc, CRD-5376 Datasheet - Page 14

• Manufacturer Part Number: CRD-5376
• Description: Audio Modules & Development Tools Ref Bd LP Mlt-Ch Decimation Filter
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-5376

• Description/function: Audio D/A
• Operating Supply Voltage: 3.3 V
• Product: Audio Modules
• Supply Current: 300 mA
• For Use With/related Products: CS3301A, CS3302A, CS4373A, CS5371A, CS5372A, CS5376A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2.1.6
Differential analog signals into the CS3301A/02A amplifiers need to be biased to the center of the power
supply voltage range, which for bipolar supplies is near ground potential. Resistors to create the common
mode bias are selected based on the sensor impedance and may need to be modified from the CRD5376
defaults depending on the sensor to be used. Refer to the recommended operating bias conditions for the
selected sensor, which are available from the sensor manufacturer.
2.2.1.7
Analog switches on CRD5376 connect the DAC_BUF test signal to the sensor. A two stage approach per-
mits flexibility in switch operation while maximizing performance. First, control signals from the digital filter
act as inputs to a 3-to-8 demultiplexer, selecting one of the eight outputs from the decoded GPIO input.
Next, the demultiplexer creates level shifted control signals for the analog switches using the selected out-
put and a pull-up / pull-down circuit on the analog power supplies. These level shifted signals control the
analog switches to connect the test DAC buffered output (DAC_BUF) to the amplifier sensor input (INA).
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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
Marine Differential Filter Specification
Hydrophone Group Capacitance
Differential Resistance
-3 dB Corner @ 6 dB/octave
Specification
Geophone Sensor Bias Resistance
Hydrophone Sensor Bias Resistance
Common Mode Bias
Analog Test Switches
Value
10 nF + 10%
200 Ω
80 kHz + 10%
Value
10 nF + 10%
200 Ω + 200 Ω = 400 Ω
40 kHz + 10%
Value
128 nF + 10%
412 kΩ + 2 kΩ = 414 kΩ
3 Hz + 10%
Value
20 kΩ || 20 kΩ = 10 kΩ
18 MΩ || 18 MΩ = 9 MΩ
CRD5376
DS612RD2