sm5841 Nippon Precision Circuits Inc, (NPC), sm5841 Datasheet - Page 14

• Manufacturer Part Number: sm5841
• Description: Audio Multi-function Digital Filter
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

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.
The DC offset is added to the output when OFST is
HIGH. DC offset is OFF when OFST is LOW.
The number of output bits is determined by the output bit length selected.
The number of output bits is determined by the output bit length selected.
512 LSB for 16-bit output
2048 LSB for 18-bit output
8192 LSB for 20-bit output
DOL or DOR
DOL or DOR
System Clock
System Clock
WCKO
WCKO
BCKO
BCKO
TB
TB
1 2
1 2
6TB
6TB
3
3
Figure 4. 8fs data output timing (CKSL = HIGH)
Figure 5. 8fs data output timing (CKSL = LOW)
4
4
5
5
SM5841H
T
T
DW
DW
= 24TB
11 12
= 32TB
11 12
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.
Bit clock rate
Data word length
13
Parameter
13
18TB
26TB
14
14
15 16 17
15 16 17
Symbol
18
18
T
NIPPON PRECISION CIRCUITS—14
T
DW
19
B
19
20
20
CKSL = HIGH
t
SYS
24T
(1/192fs)
B
1 2
1 2
CKSL = LOW
t
SYS
3
32T
(1/256fs)
3
4
B
4