SM5847AF datasheet(20/30 Pages) NPC

20 / 30 page

SM5847AF

NIPPON PRECISION CIRCUITS—20

Audio Data Output (DOL, DOR, BCKO, WCKO, DG, OW1N, OW2N, OMD, DITHN)

Output data format

The output data is in serial, simultaneous left and

right-channel, 2s complement, MSB ﬁrst, BCKO

burst (NPC format) format. Left-channel data is out-

put on DOL, and right-channel data is output on

DOR.

Output data word length

The output data word length is selected by the state

of OW1N and OW2N.

Output timing

The output timing is dependent on the CKSLN level

and output data word length.

When CKSLN is LOW, the output timing does not

change with the output data word length. However,

when CKSLN is HIGH, the DOL and DOR output

timing for 24-bit output data length (OW1N =

OW2N = LOW) start 1 clock cycle earlier than for

18, 20, or 22-bit output data length.

Output mode

The output mode, either 4fs oversampling or 8fs

oversampling, is selected by the level on OMD,

where fs is the input sampling rate.

Output dither processing

The output data word length is set by OW1N and

OW2N, whereas the SM5847AF performs all inter-

nal calculations in 25-bit words. As a consequence,

dither processing is provided to round-off errors. The

SM5847AF uses triangular dither processing (trian-

gular probability density function or TPDF) and can

be turned ON or OFF. Simple round-off processing

occurs when dither is OFF (DITHN = HIGH).

Table 9. Output data word length select

O W 1 N

O W 2 N

Output word length

L O W

24 bits

HIGH

L O W

22 bits

L O W

HIGH

20 bits

HIGH

18 bits

Table 10. Output timing

P arameter

Symbol

CKSLN

OMD = HIGH

OMD = LOW

Bit clock rate

T B

HIGH

1/192fs

1/96fs

L O W

1/256fs

1/128fs

Data word length

T DW

HIGH

24tSYS

48tSYS

L O W

32tSYS

64tSYS

Table 11. Output mode select

O M D

Output mode

L O W

4fs

HIGH

8fs

Table 12. Dither select

DITHN

Dither

LO W

O N

HIGH

O F F

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