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| 型號： | SAA7826 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control |
| 中文描述： | CD音頻解碼器，數(shù)字伺服和濾波器DAC，具有集成前置放大器和激光控制 |
| 文件頁數(shù)： | 23/89頁 |
| 文件大小： | 379K |
| 代理商： | SAA7826 |
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2003 Oct 01
23
Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
7.11
EBU interface
The bi-phase mark digital output signal at pin DOBM is in
accordance with the format defined by the IEC 60958
specification. Three different modes can be selected via
decoder register A:
DOBM pin held LOW
Data taken before concealment, mute and fade (must
always be used for CD-ROM modes)
Data taken after concealment, mute and fade.
An additional mute function is available via registers
Shadow 7 (bank 1) and decoder register 0 and C. They
provide the following:
Hardmute:immediate mute ofthe audiosample in ROM
mode at 1
×
, 2
×
or 4
×
speed
Soft mute: 3 ms ramp up or ramp down of the audio
samples in 1
×
audio mode
Bypass: switches the EBU mute function out of the EBU
signal path.
7.11.1
F
ORMAT
The digital audio output consists of 32-bit words
(‘subframes’) transmitted in bi-phase mark code (two
transitions for a logic 1 and one transition for a logic 0).
Words are transmitted in blocks of 384. The EBU frame
format is given in Table 8.
Table 8
EBU frame format; see also Table 9
Table 9
Description of EBU frame function
FUNCTION
BITS
DESCRIPTION
Sync
Auxiliary
Error flags
Audio sample
Validity flag
User data
Channel status
Parity bit
0 to 3
4 to 7
4
8 to 27
28
29
30
31
not used; normally zero
CFLG error and interpolation flags when selected by register A
first 4 bits not used (always zero); twos complement; LSB = bit 12, MSB = bit 27
valid = logic 0
used for subcode data (Q-to-W)
control bits and category code
even parity for bits 4 to 30
FUNCTION
DESCRIPTION
Sync
The sync word is formed by violation of the bi-phase rule and therefore does not contain any data.
Its length is equivalent to 4 data bits. The 3 different sync patterns indicate the following situations:
sync B; start of a block (384 words), word contains left sample; sync M; word contains left sample
(no block start) and sync W; word contains right sample.
Left and right samples are transmitted alternately.
Audio samples are flagged (bit 28 = 1) if an error has been detected but was uncorrectable. This
flag remains the same even if data is taken after concealment.
Subcode bits Q-to-W from the subcode section are transmitted via the user data bit. This data is
asynchronous with the block rate.
The channel status bit is the same for left and right words. Therefore a block of 384 words contains
192 channel status bits. The category code is always CD. The bit assignment is given in Table 10.
Audio sample
Validity flag
User data
Channel status
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| SAA7826HL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control |
| SAA7826HL/E/M1A | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC PHONIC AUTO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| SAA7826HL/E/M1A,55 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC PHONIC AUTO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| SAA7826HL/M1A | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC PHONIC AUTO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| SAA7826HL/M1A,557 | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC PHONIC AUTO RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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