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| 型號： | SAF7846HL |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 存儲器 |
| 英文描述： | One chip CD audio device with integrated MP3-WMA decoder |
| 封裝： | SAF7843HL/M295<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.html<1<Always Pb-free,;SAF7849HL/M245<SOT486-1 (LQFP144)|<<http://www.nxp.com/packages/SOT486-1.h |
| 文件頁數(shù)： | 58/93頁 |
| 文件大?。?/td> | 396K |
| 代理商： | SAF7846HL |
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SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
58 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
voltage on the radial actuator and provide the sledge with step pulses to reduce power
consumption. Filter coefficients of the continuous sledge control can be preset by the
user.
6.6.6.4
Access
The access procedure is divided into two different modes depending on the requested
jump size; see
Table 14
.
[1]
Microcontroller presettable.
The access procedure makes use of a track-counting mechanism, a velocity signal based
on a fixed number of tracks passed within a fixed time interval, a velocity set point
calculated from the number of tracks remaining, and a user-programmable parameter
indicating the maximum sledge performance.
If the number of tracks remaining is greater than the brake_distance then the sledge jump
mode should be activated, or the actuator jump should be performed. The requested jump
size together with the required sledge breaking distance at maximum access speed
defines the brake_distance value.
During the actuator jump mode, velocity control with a PI controller is used for the
actuator. The sledge is then continuously controlled using the filtered value of the radial
PID output. All filter parameters (for actuator and sledge) are user programmable.
In the sledge jump mode, maximum power (user programmable) is applied to the sledge
in the correct direction while the actuator becomes idle (the contents of the actuator
integrator charge current reduces to zero just after the sledge jump mode is initiated). The
actuator can be electronically damped during sledge jump. The gain of the damping loop
is controlled via the hold_mult parameter.
The fast track jumping circuitry can be enabled or disabled via parameter xtra_preset.
6.6.6.5
Radial automatic gain control loop
The loop gain of the radial control loop can be corrected automatically to eliminate
tolerances in the radial loop. This gain control injects a signal into the loop which is used
to correct the loop gain. Since this decreases the optimum performance, the gain control
should only be activated for a short time (for example, when starting a new disc).
This gain control differs from the level initialization. The level initialization should be
performed first. The disadvantage of using the level initialization without the gain control is
that only tolerances from the front end are reduced.
6.6.7
Off-track counting
The Track Position Indicator (TPI) signal is a flag which is used to indicate whether the
radial spot is positioned on the track, with a margin of
±
1
4
of the track-pitch. In
combination with the Radial Polarity (RP) flag the relative spot position over the tracks can
be determined.
Table 14.
Access type
Actuator jump
Sledge jump
Radial servo access procedure modes
Jump size
brake_distance
[1]
brake_distance - 32768
Access speed
decreasing velocity
maximum power to sledge
[1]
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAF7846HL/M210,557 | 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(fēng)格: 封裝 / 箱體: 封裝:Tube |
| 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(fēng)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(fēng)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(fēng)格: 封裝 / 箱體: 封裝:Tube |
| SAF7860HL/M2,557 | 制造商:NXP Semiconductors 功能描述:DSP |
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