CRD-4412A Cirrus Logic Inc, CRD-4412A Datasheet - Page 3

• Manufacturer Part Number: CRD-4412A
• Description: Audio Modules & Development Tools EvalBd 30W Qd Hlf- Brdg Dig Amp Pwr Stg
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-4412A

• Description/function: Audio Amplifiers
• Operating Supply Voltage: 18 V
• Product: Audio Modules
• For Use With/related Products: CS4412A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS786RD1
1. SYSTEM OVERVIEW
The CRD4412A reference design is an excellent means for evaluating the CS4412A 30 W digital amplifier power
stage. The board is designed to connect directly to the CRD4525 digital amplifier reference design for easy evalu-
ation. Alternatively, the CRD4412A may be used alone with all logic-level and power connections made through the
CRD4412 interface header.
The CRD4412A schematic set is shown in
about the features and connections of the CRD4525.
1.1
1.2
1.3
1.4
Power
Power (VD, VP) must be supplied to the evaluation board through the CRD4412 interface header (J2). All
voltage inputs must be referenced to ground, also provided through the CRD4412 interface header.
See the
WARNING: Please refer to the CS4412A data sheet for allowable voltage levels.
CS4412A Digital Amplifier Power Stage
The CS4412A is a 30 W quad half-bridge digital amplifier power stage. A complete description of the
CS4412A is included in the CS4412A product data sheet.
External Data Headers
The evaluation board has been designed to allow interfacing with external systems via headers J2, J4, and
J6.
The 20-pin, 2-column header, J2, is included to interface with the CRD4525 digital amplifier reference de-
sign and to interface with external sources when a CRD4525 is not connected. All necessary signals, power,
and ground are presented on this header. See
The 4-pin, 2-column header, J4, provides access to the CS4412A’s thermal warning signal and the
CS4525’s DLY_SDIN/EX_TWR signal. When a CRD4525 is attached, a shunt can be placed across these
signals to deliver the CS4412A’s thermal warning signal to the CS4525’s external thermal warning input.
Alternatively, this header can be used to connect the CS4412A’s thermal warning output to another device
and to drive an external serial audio data source into the CS4525. A single ground column is provided to
maintain signal integrity in this configuration.
The 4-pin, 2-column header, J6, provides access to the CS4412A’s over-current error signals and the
CS4525’s DLY_SDOUT signal. When a CRD4525 is attached, this header can be used to connect the
CS4412A’s over-current error signals to another device and to connect the CS4525’s delay serial audio data
output to an external device. A single ground column is provided to maintain signal integrity in this configu-
ration.
Stereo/Mono Selection
A 3-pin header (J1) is included to select between stereo and mono operation. The position of the shunt
placed across this header determines whether discrete PWM signals are routed to the full-bridge input pairs
or whether a single PWM signal is routed to both full-bridge input pairs.
It should be noted that when mono mode is selected, the outputs may be wired in parallel to achieve parallel
full-bridge operation. See
Figure 3
CRD4412 Interface Header Signal Assignments
shows the headers’ electrical connections.
Section 1.5
Figure 3
for more information.
and
Figure
Figure 3
4. See the CRD4525 data sheet for more information
for complete connectivity information.
table on
page 7
for signal-to-pin assignments.
CRD4412A
3