CRD-4525-D1 Cirrus Logic Inc, CRD-4525-D1 Datasheet - Page 4

• Manufacturer Part Number: CRD-4525-D1
• Description: Audio Modules & Development Tools Eval Bd PWM Contrlr+ PwrStg_4Lyr 1oz Cu
• Manufacturer: Cirrus Logic Inc

Specifications of CRD-4525-D1

• Description/function: Audio Amplifiers
• Product: Audio Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

4
1. SYSTEM OVERVIEW
The CRD4525-Q1 reference design is an excellent means for evaluating the CS4525 30 W digital amplifier with in-
tegrated ADC. Analog and digital audio input signal interfaces are provided; an on-board microcontroller and USB
PC interface is used for easily configuring the CS4525’s internal registers, and stand-alone mode is supported
through on-board tactile controls.
The CRD4525-Q1 schematic set is shown in
1.1
1.2
1.3
1.4
1.5
Power
A 80 W OEM switching-mode power supply is included to power the CRD4525-Q1. The power supply pro-
vides +18 V to the CS4525 power stages, and an on-board buck-converter and regulator provide power to
the logic-level digital circuitry.
Power may be supplied from the included power supply or any 12-18 VDC power supply capable of deliv-
ering sufficient current for the intended power output. Connection for the power supply is provided in J3 (see
the
CS4525 Digital Amplifier
A complete description of the CS4525 is included in the CS4525 product data sheet.
Optional user configuration settings of the CS4525 are provided through its control port registers, accessible
through the CS4525 tab of the Cirrus Logic FlexGUI software. A register-level configuration interface is pro-
vided on the Register Maps tab. See the
CS8416 Digital Audio Receiver
A complete description of the CS8416 receiver
interface are included in the CS8416 data sheet.
The CS8416 converts the input S/PDIF data stream into PCM data and clocks for the CS4525. The CS8416
operates in master mode and can provide PCM data in Left-Justified, I²S, Right-Justified 16-bit, and Right-
Justified 24-bit interface formats.
The most common operations of the CS8416 may be controlled via the S/PDIF Input Controls tab in the GUI
software application. Advanced options are accessible through the CS8416 sub-tab on the Register Maps
tab of the Cirrus Logic FlexGUI software.
System Clocking
A 24.576 MHz parallel resonant crystal, Y1, is available to provide a clock source to the CS4525. The crystal
is mounted in pin sockets, allowing easy removal or replacement. Alternatively, an input SYS_CLK signal
can be provided on pin 3 of the serial audio input header (J2).
External Data Headers
The evaluation board has been designed to allow interfacing with external systems via the headers J2, J4,
and J11.
The 12-pin, 3 column header, J2, provides access to the CS4525’s serial audio input and SYS_CLK input
signals. Place shunts across the SCLK, LRCK, and SDIN pins located in the columns labeled “S/PDIF” to
connect to the on-board S/PDIF digital interface receiver circuitry. To use an external digital audio source,
simply remove the shunts and connect a ribbon across the SCLK, LRCK, and SDIN pins located in the col-
System Connections
Figure 6
shows the headers’ electrical connections.
table on
page
Figure 6
14).
“PC Software Control” section on page 7
through
(Figure 8 on page
Figure
8.
17) and a discussion of the digital audio
for more information.
CRD4525-Q1
DS804RD4