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參數(shù)資料
| 型號： | SAA2501 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Digital Audio Broadcast DAB decoder |
| 中文描述： | 數(shù)字音頻廣播民建聯(lián)的解碼器 |
| 文件頁數(shù)： | 22/52頁 |
| 文件大?。?/td> | 206K |
| 代理商： | SAA2501 |
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January 1995
22
Philips Semiconductors
Preliminary specification
Digital Audio Broadcast (DAB) decoder
SAA2501
Fig.14 Baseband output data serial transfer format.
handbook, full pagewidth
WS
SCK
SD
MSB
left sample
LSB
MSB
right sample
LSB
1
16/18/20/22
32
1
16/18/20/22
32
valid data
MGB502
Table 11
Signals of output interfacing
The frequency of clock SCK is 64 times the sample
frequency (SCK is also used for the sub-band filter
interface).
The signal SD is the serial baseband audio data, sample
by sample (left/right interleaved; the left sample and the
right immediately following it form one stereo pair). 32 bits
are transferred per sample per channel. The samples are
transmitted in two's complement, MSB first. The output
samples are rounded to either 16, 18, 20 or 22 bit
precision, selectable by the host with L3 control interface
flags RND1 and RND0. The remainder of the
32 transferred bits per sample per channel are zero.
The word select signal WS indicates the channel of the
output samples (LOW if left, HIGH if right); WS is used for
the sub-band filter interface as well. If indicated in the
coded input data, de-emphasis filtering is performed
digitally on the output data, thus avoiding the need of
analog de-emphasis filter circuitry.
7.20
The L3 control interface
The SAA2501 uses the L3 protocol with the associated
bus as the control interface with an optional host
microcontroller (see Chapter 8 for more information). In
SIGNAL
DIRECTION
FUNCTION
SD
SCK
WS
output
output
output
baseband audio data
data clock
word select
the programming sections a general transfer protocol
outline is presented. In Section 8.2 several optional
protocol enhancements are given, which on the one hand
are less transparent from the applicant's point of view, but
on the other hand increase the efficiency of the L3
interfacing.
7.20.1
L3
SIGNALS
The L3 protocol uses 3 signals (see Table 12).
Table 12
Signals of L3 protocol
The signals operate according to the L3 protocol
description. After each device reset, the L3 interface of the
SAA2501 must be initialised and as a consequence, the
L3 interface cannot be used while the device reset signal
is activated.
SIGNAL
DIRECTION
FUNCTION
L3DATA
L3CLK
L3MODE
input/output
input
input
L3 interface serial data
L3 interface bit clock
L3 interface
address/data select
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
| SAA2503HT | MPEG2 audio decoder |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA2501H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Audio Decoder & Support |
| SAA2502 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2502H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
| SAA2503 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG2 audio decoder |
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