參數(shù)資料
型號(hào)： SAF7849HL
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 存儲(chǔ)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(yè)數(shù)： 56/93頁(yè)
文件大小： 396K
代理商： SAF7849HL
SAF784X_2
NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
56 of 93
NXP Semiconductors
SAF784x
One chip CD audio device with integrated MP3/WMA decoder
6.6.5.2
Level initialization
During startup, an automatic adjustment procedure is activated to set the values of the
radial error gain (re_gain), offset (re_offset) and satellite sum gain (sum_gain) for TPI
level generation. The initialization procedure runs in a radial open loop situation and is
≤
300 ms. This start-up time period may coincide with the last part of the motor start-up
time period:
Automatic gain adjustment: as a result of this initialization the amplitude of the
RE signal is adjusted to within
±
10 % around the nominal RE amplitude
Offset adjustment: the additional offset in RE due to the limited accuracy of the
start-up procedure is less than
±
50 nm
TPI level generation: the accuracy of the initialization procedure is such that the duty
factor range of TPI becomes 0.4 < duty factor < 0.6 (default duty factor = TPI HIGH / TPI
period).
6.6.5.3
Dropout detection
This detector can be influenced by one parameter (CA_drop). Focus will be lost and the
integrator of the PID will hold if the CA signal drops below this programmable absolute
CA level. When focus is lost, it is assumed initially, to be caused by a black dot.
Table 13.
Parameter
ω
1
ω
2
ω
3
ω
4
ω
3
/
ω
2
ω
5
= (
ω
1
× ω
2
/
ω
3
)
G
G
E
Radial PID Parameters
Controlled by
-
-
rad_parm_play
rad_pole_noise
rad_length_lead
rad_int_strength
rad_gain
end stage gain
Comment
radial integrator bandwidth
start of radial lead
end of radial lead (differentiating part)
low-pass function following PID
lead length (proportional part)
integrator strength
radial loop gain
defined as peak-to-peak voltage-swing over
radial actuator
Fig 33. Bode diagram of radial PID system
001aag344
frequency
(log Hz)
amplitude
(dB)
rad_gain
rad_int_strength
ω
5
ω
1
ω
2
ω
3
ω
4
I
D
P
rad_lead_length
rad_int
rad_pole_noise
rad_pole_lead
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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
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