SM5841H Datasheet, PDF (14/20 Pages) Nippon Precision Circuits Inc – Audio Multi-function Digital Filter

SM5841H
Audio Data Output (DOL, DOR, BCKO, WCKO, OFST)
The output data is in 16/18/20-bit serial, 8fs, simulta-
neous left and right-channel, 2s complement, MSB
first format.
A DC offset can be added to arithmetic data before
the data is output to reduce the D/A converter zero-
crossing distortion for very small input signals. The
offset added is approximately 0.8% of full-scale for
the corresponding output bit length, as shown below.
s 512 LSB for 16-bit output
s 2048 LSB for 18-bit output
s 8192 LSB for 20-bit output
The DC offset is added to the output when OFST is
HIGH. DC offset is OFF when OFST is LOW.
8fs serial data is output on independent DOL and
DOR channels, in sync with the falling edge of the
internal system clock and BCKO clock. The number
of BCKO bit clock pulses per word changes depend-
ing on the output bit length selected (16/18/20 bits).
Consequently, output data is latched into the D/A
converter internal register on the falling of the edge
of an output word clock WCKO, which has timing
independent of the number of output bits as specified
in the following table.
Parameter
Bit clock rate
Data word length
Symbol
T_B
T_DW
CKSL = HIGH
t_SYS (1/192fs)
24T_B
CKSL = LOW
t_SYS (1/256fs)
32T_B
System Clock
TB
BCKO
DOL or DOR
1 23 4 5
11 12 13 14 15 16 17 18 19 20
WCKO
6TB
18TB
TDW = 24TB
The number of output bits is determined by the output bit length selected.
Figure 4. 8fs data output timing (CKSL = HIGH)
System Clock
TB
BCKO
DOL or DOR
1 23 4 5
11 12 13 14 15 16 17 18 19 20
WCKO
6TB
26TB
TDW = 32TB
The number of output bits is determined by the output bit length selected.
Figure 5. 8fs data output timing (CKSL = LOW)
1 23 4
1 23 4
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