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參數(shù)資料
| 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)： | 35/89頁 |
| 文件大小： | 379K |
| 代理商： | SAA7826 |
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2003 Oct 01
35
Philips Semiconductors
Product specification
CD audio decoder, digital servo and filterless
DAC with integrated pre-amp and laser control
SAA7826
7.16.9.4
Automatic sequencers and timer interrupts
Two automatic sequencers are implemented (and must be
initialized after power-on):
Auto-start sequencer: controls the start-up of focus,
radial and motor
Auto-stop sequencer: brakes the disc and shuts down
the servos.
When the automatic sequencers are not used it is possible
to generate timer interrupts, defined by the
time_parameter coefficient.
7.16.9.5
High-level status
Thereadhigh-levelstatus commandcanbeused toobtain
the interrupt, decoder, autosequencer status registers and
the motor start time. Use of the read high-level status
command clears the interrupt status register, and
re-enables the subcode read via a servo command.
7.16.10 D
RIVER INTERFACE
The control signals (pins RA, FO and SL) for the
mechanism actuators are pulse density modulated. The
modulating frequency can be set to either 1.0584 or
2.1168 MHz; controlled via the xtra_preset parameter.
An analog representation of the output signals can be
achieved by connecting a 1st-order low-pass filter to the
outputs.
During reset (i.e. RESET pin is held LOW) the RA, FO and
SL pins are high-impedance. At all other times, when the
laser is switched off, the RA and FO pins output a 2 MHz
50% duty factor signal.
7.16.11 L
ASER INTERFACE
The laser diode pre-amplifier function is built into the
SAA7826; see Fig.23. The current can be regulated, up to
120 mA [programmed via new shadow register A (bank 2)
and register 3 (bank 3)], in four steps ranging from 58% up
to full power. New shadow register A (bank 2) and
register 3 (bank 3)] are used to select the step values.
The voltage derived from the monitor diode is maintained
at a steady state by the laser drive circuitry, by regulating
the current through the laser diode. The type of monitor
diodebeingused(150 mVor180 mV)mustbeselectedby
new shadow register 7 (bank 2) (reset state = 150 mV).
The laser can be switched on or off by the xtra_preset
parameter; it is automatically driven if the focus control
loop is active.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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