參數(shù)資料
型號: SAA7325H
廠商: NXP SEMICONDUCTORS
元件分類: 消費家電
英文描述: Digital servo processor and Compact Disc decoder with integrated DAC CD10
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝: PLASTIC, SOT-393-1, QFP-64
文件頁數(shù): 18/68頁
文件大小: 273K
代理商: SAA7325H
1999 Jun 17
18
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10)
SAA7325
7.8.2
E
XTERNAL
DAC
INTERFACE
Audio data from the SAA7325 decoder can be sent to an
external DAC, identical to the SAA737x series. This is
similar to the ‘loopback’ mode, but in this case the internal
DAC outputs can be held at zero. i.e. shadow register 7 is
set to XX00. The SAA7325 is compatible with a wide range
of external DACs. Eleven formats are supported and are
given in Table 5. Figures 12 and 13 show the Philips
I
2
S-bus and the EIAJ data formats respectively. When the
decoder is operated in lock-to-disc mode, the SCLK
frequency is dependent on the disc speed factor ‘d’.
All formats are MSB first and f
s
is (44.1
×
n) kHz.
The polarity of the WCLK and the data can be inverted;
selectable by decoder register 7. It should be noted that
EF is only a defined output in CD-ROM and 1f
s
modes.
When using an external DAC (or when using the onboard
DAC in non-loopback mode), the serial data inputs to the
onboard DAC (SCLI, SDI and WCLI) should be left
unconnected.
Table 5
DAC interface formats
Note
1.
In this mode the first 16 bits contain data, but if any of the fade, attenuate or de-emphasis filter functions are activated
then the first 18 bits contain data.
REGISTER 3
SAMPLE
FREQUENCY
NUMBER OF
BITS
SCLK (MHz)
FORMAT
INTERPOLATION
1010
1011
1110
0010
0110
0000
0100
1100
0011
0111
1111
f
s
f
s
f
s
f
s
f
s
4f
s
4f
s
4f
s
2f
s
2f
s
2f
s
16
16
2.1168
2.1168
2.1168
2.1168
2.1168
8.4672
8.4672
8.4672
4.2336
4.2336
4.2336
CD-ROM (I
2
S-bus)
CD-ROM (EIAJ)
Philips I
2
S-bus 16/18 bits
(1)
EIAJ 16 bits
EIAJ 18 bits
EIAJ 16 bits
EIAJ 18 bits
Philips I
2
S-bus 18 bits
EIAJ 16 bits
EIAJ 18 bits
Philips I
2
S-bus 18 bits
no
no
yes
yes
yes
yes
yes
yes
yes
yes
yes
16/18
(1)
16
18
16
18
18
16
18
18
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