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| 型號： | SAA7826HL |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | DRAM |
| 英文描述： | CD audio decoder, digital servo and filterless DAC with integrated pre-amp and laser control |
| 封裝： | SAA7826HL/M1AS/S5<SOT315-1 (LQFP80)|<<http://www.nxp.com/packages/SOT315-1.html<1<Always Pb-free,; |
| 文件頁數(shù)： | 19/89頁 |
| 文件大?。?/td> | 379K |
| 代理商： | SAA7826HL |
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2003 Oct 01
19
Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
7.9
Audio functions
7.9.1
D
E
-
EMPHASIS AND PHASE LINEARITY
When pre-emphasis is detected in the Q-channel
subcode, the digital filter automatically includes a
de-emphasis filter section. When de-emphasis is not
required, a phase compensation filter section will control
the phase of the digital oversampling filter to
≤ ±
1
°
within
the 0 to 16 kHz band. With de-emphasis the filter is not
phase linear.
If the de-emphasis signal is set to be available at pin V5,
selected via decoder register D, then the de-emphasis
filter is bypassed.
7.9.2
D
IGITAL OVERSAMPLING FILTER
For optimization of performance with an external DAC, the
SAA7826 contains a 2 to 4 times oversampling IIR filter.
The filter specification of the 4 times oversampling filter is
given in Table 5.
The attenuation does not include the sample-and-hold at
the external DAC output or the DAC post filter. When using
the oversampling filter, the output level is scaled
0.5 dB
down to avoid overflow on full-scale sine wave inputs
(0 to 20 kHz).
Table 5
Filter specification
7.9.3
C
ONCEALMENT
A 1-sample linear interpolator becomes active if a single
sample is flagged as erroneous but cannot be corrected.
The erroneous sample is replaced by a level midway
between the preceding and following samples. Left and
right channels have independent interpolators. If more
thanoneconsecutivenon-correctablesampleisfound,the
last good sample is held. A 1-sample linear interpolation is
then performed before the next good sample; see Fig.13.
In CD-ROM modes (i.e. the external DAC interface is
selected to be in a CD-ROM format) concealment is not
executed.
7.9.4
M
UTE
,
FULL
-
SCALE
,
ATTENUATION AND FADE
A digital level controller is present on the SAA7826 which
performs the functions of soft mute, full-scale, attenuation
and fade; these are selected via decoder register 0:
Mute: signal reduced to 0 in a maximum of 128 steps;
3/n ms
Attenuation: signal scaled by
12 dB
Full-scale: ramp signal back to 0 dB level; from mute it
takes 3/n ms
Fade: activates a 128 stage counter which allows the
signal to be scaled up or down in 0.07 dB steps
– 128 = full-scale
– 120 =
0.5 dB (i.e. full-scale if oversampling filter is
used)
– 32 =
12 dB
– 0 = mute.
7.9.5
P
EAK DETECTOR
The peak detector measures the highest audio level
(absolute value) on positive peaks for left and right
channels. The 8 most significant bits are output in the
Q-channel data in place of the CRC bits. Bits 81 to 88
containtheleftpeakvalue(bit 88 = MSB)andbits89 to 96
contain the right peak value (bit 96 = MSB). The values
are reset after reading Q-channel data via pin SDA.
PASS BAND
STOP BAND
24 kHz
24 to 27 kHz
27 to 35 kHz
35 to 64 kHz
64 to 68 kHz
68 kHz
69 to 88 kHz
ATTENUATION
≤
0.001 dB
≤
0.03 dB
≥
25 dB
≥
38 dB
≥
40 dB
≥
50 dB
≥
31 dB
≥
35 dB
≥
40 dB
0 to 9 kHz
19 to 20 kHz
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| 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| SAA7826HL/M1AS/S5, | 制造商:NXP Semiconductors 功能描述:- Tape and Reel 制造商:NXP Semiconductors 功能描述:DSP |
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