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參數(shù)資料
| 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)： | 28/89頁 |
| 文件大?。?/td> | 379K |
| 代理商： | SAA7826HL |
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2003 Oct 01
28
Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
7.15.3
L
OOP CHARACTERISTICS
The gain and crossover frequencies of the motor control
loop can be programmed via decoder registers 4 and 5.
The following parameter values are possible:
Gains: 3.2, 4.0, 6.4, 8.0, 12.8, 16, 25.6 and 32
Crossover frequency f
4
: 0.5
×
n Hz, 0.7
×
n Hz,
1.4
×
n Hz and 2.8
×
n Hz
Crossover frequency f
3
: 0.85
×
n Hz, 1.71
×
n Hz and
3.42
×
n Hz.
It should be noted that the crossover frequencies f
3
and f
4
are scaled with the overspeed factor ‘n’ whereas the gains
are not.
7.15.4
FIFO
OVERFLOW
If FIFO overflow occurs during Play mode (e.g. as a result
of motor rotational shock), the FIFO will be automatically
reset to 50% and the audio interpolator will conceal as
much as possible to minimize the effect of data loss.
Table 12
Operating modes
MODE
DESCRIPTION
Start mode 1
The disc is accelerated by applying a positive voltage to the spindle motor. No decisions are
involved and the PLL is reset. No disc speed information is available for the microcontroller.
The disc is accelerated as in start mode 1, however the PLL will monitor the disc speed. When the
disc reaches 75% of its nominal speed, the controller will switch to jump mode. The motor status
signals selectable via register 2 are valid.
Motor servo enabled but FIFO kept reset at 50%, integrator is held. The audio is muted but it is
possible to read the subcode. It should be noted that in the CD-ROM modes the data, on EBU and
the I
2
S-bus, is not muted.
Similar to jump mode but motor integrator is kept at zero. It is used for long jumps where there is a
large change in disc speed.
FIFO released after resetting to 50% and the audio mute is released.
Disc is braked by applying a negative voltage to the motor; no decisions are involved.
The disc is braked as in stop mode 1 but the PLL will monitor the disc speed. As soon as the disc
reaches 12% (or 6%, depending on the programmed brake percentage, via register E) of its
nominal speed, the MOTSTOP status signal will go HIGH and switch the motor servo to off mode.
Motor not steered.
Start mode 2
Jump mode
Jump mode 1
Play mode
Stop mode 1
Stop mode 2
Off mode
MGA362 - 2
G
f
4
f
BW
3
f
Fig.20 Motor servo mode diagram.
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| 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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