WM8803CDTSLASHV datasheet(17/45 Pages) WOLFSON

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WM8803

PP Rev 1.1 September 2003

DATA INPUT AND OUTPUT

BI-PHASE MARK MODULATED DIGITAL DATA INPUT (RXIN)

The bi-phase mark modulated digital data is input through the RXIN pin.

The RXIN pin supports TTL levels. This allows a 5V optical reception module to be connected

directly.

BI-PHASE MARK MODULATED INPUT DATA RECEPTION RANGE SETTING

The WM8803 can restrict the upper limit of the input data sampling frequency received and only

receive input data at selected sampling frequencies.

The input frequency is set by selecting FLIMIT = 1 and selecting the required sampling rate with

FSSEL[3:0], Table 9.

FSSEL3

FSSEL2

FSSEL1

FSSEL0

INPUT DATA RECEPTION RANGE

32kHz to 96kHz

32kHz only

44.1kHz only

48kHz only

88.2kHz only

96kHz only

44.1kHz or 88.2kHz only

48kHz or 96kHz only

32kHz or 44.1kHz or 48kHz

….

…..

Reserved

Table 9 Input Data Reception Range (FS4XIN = 0)

Note:

The notation 32kHz to 96kHz means 32k, 44.1k, 48k, 64k, 88.2k, or 96kHz.

The table above only applies when the input fs calculation mode FS4XIN = 0. When FS4XIN = 1, fs

data at twice the shown values is supported.

Input data that exceeds the set range is handled as an error, and the XIN source clock is output. At

this time, the SDATO output data is determined by the RDTSEL setting.

When the PLL is following a source with a changing fs, such as a CD player with a variable pitch

control, if the oscillator amplifier is stopped with the PLL in the locked state the fs calculation is not

performed. As a result, an input frequency outside the set range will not result in an error. The

oscillator amplifier must be set to continuous operation mode to handle sources such as this.

In systems that connect CLKOUT to XIN and thus do not require an oscillator element, it is not

possible to perform the fs calculation. In this mode the reception range cannot be limited.

OUTPUT DATA FORMATS: NORMAL MODE (SDATO)

The output format of audio data is set up after recovery. In Normal Mode the SDATO audio data

range can be of the input data format only.

The output format is set with the OFSEL[2:0]. The BCLK, LRCLK, and SDATO synchronize to the

rising edge of CLKOUT. SDATO is synchronized to the falling edge of BCLK and is clocked on the

rising edge.

After an error is detected and ERROR goes output low, the output data is synchronized with the

LRCLK edge immediately following the Error signal.

The ERROR low signal is output for the signal outside the effective bit length of the output data.

WM8803CDT/V Datasheet(PDF) 17 Page - Wolfson Microelectronics plc

WM8803CDT/V Datasheet(HTML) 17 Page - Wolfson Microelectronics plc

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