CRD44800 Cirrus Logic Inc, CRD44800 Datasheet - Page 6

• Manufacturer Part Number: CRD44800
• Description: Audio Modules & Development Tools Ref Bd 8ch 115dB 192kHz PWM
• Manufacturer: Cirrus Logic Inc

Specifications of CRD44800

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

CRD44800
5) Supply either analog signals (if the Analog input option is selected) or either coaxial or optical
digital PCM inputs (if the digital S/PDIF option is selected).
6) Connect loudspeakers to the speaker output terminals. The Red terminal is positive, and the
Black terminal is ground.
Rx Lx Rs Ls S
C
R
L
Figure 1. Speaker Terminal Configuration
Turn the volume control fully counterclockwise and apply power using the power switch on the
power entry module. The Fault and Mute LEDs will both light briefly as the system is initialized.
Note that if either the Coax or the Optical input is selected, a valid digital signal must be provided
to the selected input so that the CRD44800 can complete initialization. If a valid signal is not
present at the selected input, both the Fault and Mute LEDs will remain lit.
If one of the stand-alone modes is selected, the amplifiers should now be operating. Slowly ad-
vance the volume control clockwise until the desired volume is achieved. The MUTE pushbutton
(S2) may be used to mute and unmute the audio output. The RAMP UP/DN pushbutton (S3) will
initiate a ramp up or ramp down of the audio output. Ramping down the audio output stops any
audio output. In order to avoid a “pop” in the speakers, you should ramp down the outputs before
turning off the AC power.
Note that in the stand-alone mode, several system faults are indicated by the lighting of the red
Fault LED, D19. Typical causes for fault conditions are short circuited speaker outputs, thermal
shutoff of the power back end, or lack of a S/PDIF signal when either of the S/PDIF inputs is se-
lected.
Remote Operation
The CRD44800 may also be operated remotely via the Cirrus FlexGUI for complete control of all
the features of the CS44800. Note that the Fault and Mute LEDs operate differently in the remote
mode. They indicate the selected audio signal input as explained below. Follow the procedure
below to set up remote operation.
1) Attach the supplied power cord to the power entry module. Do not turn on the power yet.
2) Configure jumpers J17 and J18 for remote operation. Jumpers J17 and J18 should have pins
2 and 3 connected for remote operation. Jumpers J6 and J7 should be removed completely.
3) Turn on the AC power. Press the Reset button on the driver board. Select the desired audio
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