CS8420 CIRRUS [Cirrus Logic], CS8420 Datasheet - Page 46

• Manufacturer Part Number: CS8420
• Description: DIGITAL AUDIO SAMPLE RATE CONVERTER
• Manufacturer: CIRRUS [Cirrus Logic]

13. SOFTWARE MODE - PIN DESCRIPTION
The above diagram and the following pin descriptions apply to software mode. In hardware
mode, some pins change their function as described in subsequent sections of this data sheet.
Fixed function pins are marked with a *, and will be described once in this section. Pins marked
with a + are used upon reset to select various start-up options, and require a pull-up or pull-
down resistor.
Power Supply Connections:
VD+ - Positive Digital Power *
VA+ - Positive Analog Power *
DGND - Digital Ground *
AGND - Analog Ground *
Clock Related Pins:
OMCK - Output Section Master Clock Input
RMCK - Input Section Recovered Master Clock Output
FILT - PLL Loop Filter *
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Positive supply for the digital section. Nominally +5V.
Positive supply for the analog section. Nominally +5V. This supply should be as quiet as possible since
noise on this pin will directly affect the jitter performance of the recovered clock.
Ground for the digital section. DGND should be connected to the same ground as AGND.
Ground for the analog section. AGND should be connected to the same ground as DGND.
Output section master clock input. The frequency must be 256x, 384x, or 512x the output sample rate
(Fso).
Input section recovered master clock output. Will be at a frequency of 128x or 256x the input sample
rate (Fsi).
An RC network should be connected between this pin and ground. Recommended schematic and
component values are given in the Receiver section of this data sheet.
CS8420
DS245PP2