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參數(shù)資料
| 型號： | SAF7847HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顏色信號轉(zhuǎn)換 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 中文描述： | COLOR SIGNAL DECODER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.40 MM HEIGHT, SOT486-1, MS-026, PLASTIC, QFP-144 |
| 文件頁數(shù)： | 47/93頁 |
| 文件大小： | 396K |
| 代理商： | SAF7847HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
47 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
Kf_mult operates by sampling the input. For example, for Kf_mult = 1, every sample of
the input is passed through to the integrator circuit, for a Kf_mult of 0.5, every second
sample is passed through, for a Kf_mult of 0.25, every fourth sample is passed
through, and so on.
For a DC input signal, K
F
×
Kf_mult should always give the same result. If however,
the input is varying quickly, the K
F
×
Kf_mult combinations with the same product will
not always give the same result, especially for low values of Kf_mult, where the
sampling in the extreme becomes 1 out of every 128 samples. The input samples to
the block that performs the Kf_mult multiplication occur at a rate of one sample every
24 system clock periods. Sub-sampling might affect the resulting gain.
6.5.10.4
Operation modes
The motor controller mode is programmed in register MotorControl. It can operate open
loop, just sending a fixed power to the motor, for start-up and stopping, closed loop, or
shut-down. This register also selects between PDM and PWM formats.
Motor start and stop modes will put a fixed duty cycle PWM or fixed density PDM signal on
the motor outputs. During start or stop, motor speed can be monitored by reading
MotorIntLSB and MotorIntMSB.
MotorOv:
When not setting the appropriate gains in the loop, an overflow might occur
inside the PWM/PDM modulator block, or in the programmable gain stage. This is
signalled by the MotorOv interrupt, which can be read back on InterruptStatus2. The
interrupt clears when the overflow clears.
MotorOv can also automatically open sw1 or sw2. This is enabled by writing a ‘1’ to
bit OVFSW in register MotorControl.
6.5.10.5
Writing, reading motor integrator value
It is possible to obtain the integrator value by reading the registers MotorIntLSB and
MotorIntMSB. The integrator can be written at the same location. By opening all switches,
the user can bypass the whole control and filter part, and just use the block as a DAC
towards the motor drivers. The control part can then be done by software.
6.5.10.6
Some notes on application motor servo
The motor servo can be used to control the motor during CLV playback and also during
CAV or pseudo-CLV lock-to-disc or jump mode.
In CLV mode, both sw1 and sw2 must be closed
In CAV/pseudo-CLV mode, sw2 must be open and sw1 can be open
The motor servo will revolve the disc at the speed corresponding to the frequency set
point. In CLV mode with lock to EFM, the frequency set point must be selected equal
to the desired readout frequency of the HF PLL
Accelerating the disc must be done in one of the start modes
Braking the disc must be done in one of the stop modes
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7847HL/M201,557 | 功能描述:音頻 DSP 1 chip CD Audio Dev w/Integrated decoder RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M245,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7849HL/M295,557 | 功能描述:音頻 DSP IC AUD DECODER RoHS:否 制造商:Texas Instruments 工作電源電壓: 電源電流: 工作溫度范圍: 安裝風格: 封裝 / 箱體: 封裝:Tube |
| SAF7860HL/M2,557 | 制造商:NXP Semiconductors 功能描述:DSP |
| SAF82520PVB2 | 制造商:SIEMENS 功能描述:New |
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