CRD-5376 Cirrus Logic Inc, CRD-5376 Datasheet - Page 16

• 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

2.2.2
The CS3301A/02A amplifiers act as a low-noise gain stage for internal or external differential analog sig-
nals.
2.2.2.1
By default, channels 1 and 2 of CRD5376 use the CS3301A geophone amplifier while channels 3 and 4
use the CS3302A hydrophone amplifier. The CS3301A amplifier is chopper stabilized and connects pin
13 to a clock source (MCLK/2) to run the chopper circuitry synchronous to the modulator analog sampling
clock. The CS3302A device is not chopper stabilized (with 1/f noise typically buried below the low-fre-
quency ocean noise) to achieve very high input impedance. To minimize leakage from high impedance
sensors connected to the CS3302A amplifier, pin 13 produces a GUARD signal output to actively drive a
sensor cable shield with the common mode voltage of the sensor signal.
Comparing the CS3301A and CS3302A amplifiers, the functionality of pin 13 (CLK input vs. GUARD out-
put) is the only external difference. CRD5376 can be converted to use any combination of CS3301A and
CS3302A amplifiers by replacing the amplifier device and properly installing the pin 13 jumpers. Only one
set of pin 13 jumpers should be installed per channel (either CS3301A or CS3302A), and the others re-
moved.
Common amplifier configurations for CRD5376 include 3x or 4x CS3301A amplifiers for land applications,
4x CS3302A amplifiers for marine streamer applications, and 3x CS3301A amplifiers plus 1x CS3302A
amplifier for seabed reservoir monitoring applications. Replacement amplifiers can be requested as sam-
ples from the local Cirrus Logic sales representative.
16
Analog Signals
INA
INB
OUTR, OUTF
GUARD
Digital Signals
MUX[0..1]
GAIN[0..2]
PWDN
CLK
Differential Amplifiers
MCLK/2 Input vs. GUARD Output
CH1
CH2
CH3
CH4
Table 6. Amplifier Pin 13 Jumper Settings
Description
Sensor analog input
Test DAC analog input
Analog rough / fine outputs
CS3302A guard output (jumper selection)
Description
Input mux selection
Gain range selection
Power down mode enable
CS3301A clock input (jumper selection)
Amplifier
U16
U2
U33
U3
R128 + R84
R95 + R132
R58 + R100
R86 + R92
CS3301A
CS3302A
R129
R87
R94
R59
CRD5376
DS612RD2