CDB5374 Cirrus Logic Inc, CDB5374 Datasheet - Page 14

• Manufacturer Part Number: CDB5374
• Description: Audio Modules & Development Tools 2-Ch DS Modulator & Hydrophone Demo Brd
• Manufacturer: Cirrus Logic Inc

Specifications of CDB5374

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.2
2.2.1
2.2.1.1
External signals into CDB5374 are typically from piezoelectric hydrophones, which are high-impedance
sensors optimized to measure pressure in marine applications.
External signals connect to CDB5374 through screw terminals on the left side of the PCB. For each chan-
nel (CH1, CH2, CH3, CH4), these screw terminals make connections to two external differential inputs,
INA and INB. In addition, GND and GUARD connections are provided for connecting sensor cable shields,
if present.
2.2.1.2
The CS5374 hydrophone amplifier provides a GUARD signal output designed to actively drive the cable
shield of a high impedance sensor with the common mode voltage of the sensor differential signal. This
GUARD output on the cable shield minimizes leakage by minimizing the voltage differential between the
sensor signal and the cable shield.
The GUARD signal is output to screw terminals on the left side of the PCB and a separate GND connec-
tion screw terminal for each channel is also provided if a ground connection to the sensor cable shield is
preferred.
2.2.1.3
The CS4373A test DAC has two high-performance differential test outputs, a precision output
(DAC_OUT) and a buffered output (DAC_BUF). These test outputs can be connected to the INA or INB
inputs of any channel through the input selection jumpers.
By default, CDB5374 is populated with passive RC filter components on the INA inputs, and no filter com-
ponents on the INB inputs (though the component footprints are present on the INB inputs). Because the
CS4373A precision output will not tolerate significant loading, on CDB5374 the DAC_OUT signal should
only jumper to the INB inputs. The CS4373A buffered outputs are less sensitive to the RC filter load and
DAC_BUF can be jumper-ed to either the INA or INB inputs.
14
Analog Hardware
Analog Inputs
External Inputs - INA, INB, BNC
GUARD Output, GND Connection
Internal Inputs - DAC_OUT, DAC_BUF
Table 7. Screw Terminal Input Connectors
Signal Input
CH1 INA
CH1 INB
CH2 INA
CH2 INB
CH3 INA
CH3 INB
CH4 INA
CH4 INB
Screw Terminal
J232
J241
J332
J341
J432
J441
J32
J41
CDB5374
DS862DB1