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參數(shù)資料
| 型號： | SAA7325 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital servo processor and Compact Disc decoder with integrated DAC (CD10 II)(具有綜合數(shù)模轉(zhuǎn)換器（DAC）的數(shù)字伺服處理器和光盤譯碼器) |
| 中文描述： | 數(shù)字伺服處理器和光盤解碼器集成了援會（CD10型二）（具有綜合數(shù)模轉(zhuǎn)換器（DAC）的的數(shù)字伺服處理器和光盤譯碼器） |
| 文件頁數(shù)： | 17/68頁 |
| 文件大?。?/td> | 281K |
| 代理商： | SAA7325 |
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2000 Jun 26
17
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7325
7.8
DAC interface
7.8.1
I
NTERNAL BITSTREAM
D
IGITAL
-
TO
-A
NALOG
C
ONVERTER
(DAC)
The onboard bitstream DAC operates at a clock frequency
of 96f
s
and is designed for operation with an audio input at
1f
s
. Optimum performance is dependent on the application
circuit used and careful consideration should be given to
the recommended application circuits shown in
Figs 0 and 39. The onboard DAC is controlled from
shadow register 7 (see Section 7.15.3 for definition of
shadowregisters).Thisshadowregistercontrolsroutingof
data into the onboard DAC and also controls the DAC
output pins, which can be held at zero when the onboard
DAC is not required; see Table 4.
Audio data from the decoder part of SAA7325 can be
routed as described in Sections 7.8.1.1 and 7.8.1.2.
7.8.1.1
Use onboard DAC
Setting shadow register 7 to XX11 will route audio data
from the CD10 decoder into the internal DAC, and enables
the DAC output pins (LN, LP, RN, RP). To enable the
on-boardDAC,theDACinterfaceformat(setbyregister 3)
must be set to 16-bit 1fs mode, either I
2
S or EIAJ format.
CD-ROM mode can also be used if interpolation is not
required. The serial data output pins for interfacing with an
external DAC (SCLK, WCLK, DATA and EF) are set to
high-impedance.
7.8.1.2
Loopback external data into onboard DAC
The onboard DAC can also be set to accept serial data
inputs from an external source, e.g. an Electronic Shock
Absorption (ESA) IC. This is known as loopback mode and
is enabled by setting shadow register 7 to XX01. This
enables the serial data output pins (SCLK, WCLK, DATA
and EF) so that data can be routed from the SAA7325 to
an external ESA system (or external DAC).
The serial data from an external ESA IC can then also be
input to the onboard DAC on the SAA7325 by utilising the
serial data input interface (SCLI, SDI and WCLI).
In this mode, a wide range of data formats to the external
ESA IC can be programmed as shown in Table 5.
However, the serial input on the SAA7325 will always
expect the input data from the ESA IC to be 16 bit 1f
s
and
the same data format, either I
2
S-bus or EIAJ, as the serial
output format (set by decoder register 3).
Table 4
Shadow register
SHADEN
SHADOW
ADDRESS
REGISTER
DATA
FUNCTION
RESET
1
0111 (7H)
control of
onboard DAC
XXX0
XXX1
XX0X
hold onboard DAC outputs at zero
enable onboard DAC outputs
use external DAC or route audio data into
onboard DAC (loopback mode)
route audio data into onboard DAC
(non-loopback mode)
reset
reset
XX1X
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