SM5842AP Datasheet, PDF (15/23 Pages) Nippon Precision Circuits Inc – High-Class Audio Multi-function Digital Filter

SM5842AP/APT
Audio Data Output (DOL, DOR, BCKO,
WCKO, OW20N)
The output data is in serial, simultaneous left and
right-channel, 2s complement, MSB first, BCKO
burst (NPC format) format. The output data word
length is selected by the state of OW1N and OW2N
as shown in table 5.
Table 5. Output word length select
OW1N
LOW
LOW
HIGH
HIGH
OW2N
LOW
HIGH
LOW
HIGH
Output word length
24 bits
22 bits
20 bits
18 bits
8fs serial data is output in sync with the falling edge
of the internal system clock and BCKO clock. The
output timing is determined by CKSLN and the out-
put word length. When CKSLN is LOW, the output
timing is the same for different output word lengths.
Only the number of BCKO bit clock pulses word
changes depending on the output word length
selected. When CKSLN is HIGH, however, the out-
put timing for 24-bit output mode starts 1 bit earlier
than for 18/20/22-bit output mode.
Table 6. Output timing
Parameter
Bit clock rate
Data word length
Symbol CKSLN = HIGH CKSLN = LOW
t_B
1/192fs
t_DW
24t_SYS
1/256fs
32t_SYS
NIPPON PRECISION CIRCUITS—15