AV2188 Datasheet, PDF (6/20 Pages) List of Unclassifed Manufacturers – Multi-Channel Audio CODEC

AV2188
DIGITAL AUDIO SERIAL INTERFACE
The digital serial interface consists of 3 serial input pins, SD1, SD2, and SD3, one serial output pin, SDOUT, one
serial clock input pin, SC, and one left/right indicator input pin, SF. The data are 2’s complement MSB first
numbers. The AV2188 supports four resolutiont, which are selected either by setting the FMT[1] and FMT[0] pins
or by programming the control register CREG0[5:4] via the I²C serial control port. Table 1 describes these four
resolution. .
Table (1): Audio Serial Data Input Format
Format CREG0[5] CREG0[4] SD1, SD2, and SD3
0
0
0 24-bit
1
0
1 20-bit
2
1
0 18-bit
3
1
1 16-bit
SDOUT
24-bit
The SD3, SD2 and SD1 can be either 24-bit or 32-bit per frame as well as left justified, right justified or I2S. The
SDOUT only support left justified and I2S format. The AV1488 counts the number of BCK per frame to determine
whether the input is 24 or 32 bits format.
Table (1): Audio Serial Data Input Modes
Mode
0
1
2
3
CREG0[7] 0REG0[6] SD1, SD2, and SD3
0
0 Right Justified
0
1 I2S
1
0 Left Justified
1
1 Invalid
SDOUT
Left Justified
I2S
Left Justified
6-20
June 2, 2000