參數(shù)資料
型號(hào)： SAA7324
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(pán)譯碼器)
中文描述： 數(shù)字伺服處理器和光盤(pán)解碼器集成了援會(huì)（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(pán)譯碼器）
文件頁(yè)數(shù)： 17/68頁(yè)
文件大小： 285K
代理商： SAA7324
2000 Jun 26
17
Philips Semiconductors
Product specification
Digital servo processor and Compact Disc
decoder with integrated DAC (CD10 II)
SAA7324
7.8
DAC interface
7.8.1
I
NTERNAL BITSTREAM DIGITAL
-
TO
-
ANALOG CONVERTER
(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 38 and 39. The onboard DAC is controlled from shadow register 7
(see Section 7.15.3 for definition of shadow registers). This shadow register controls routing of 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 the SAA7324 can be routed as described in Sections 7.8.1.1 and 7.8.1.2.
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
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 and RP). To enable the
on-boardDAC,theDACinterfaceformat(setbyregister 3)
must be set to 16-bit 1f
s
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.Thisisknownasloopbackmodeand
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
SAA7324 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 SAA7324 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 SAA7324 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).
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SAA7324H 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder with integrated DAC CD10 II
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SAA7325 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Digital servo processor and Compact Disc decoder with integrated DAC CD10
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