S5L1454A Просмотр технического описания (PDF) - Samsung

Номер в каталоге

Компоненты Описание

производитель

S5L1454A

DVD PLAYER DIGITAL SERVO & DSP IC

Samsung 

S5L1454A

DVD PLAYER DIGITAL SERVO & DSP IC

AUTOMATIC CONTROL FUNCTION

¢º¢º FOCUS/TRACKING OFFSET CONTROL

Summary

Before turning the servo loop filter on, the focus and tracking error offset are measured/averaged and stored in

the register. This is to use the values during later filter operations in order to eliminate remaining error offset.

 Input signal : FE, TE

 Control Register(32bit) : Fofst(#1083~2), Tofst (#1085~4)

 Output Signal : SENSE

 FILTER Operation :

FEin = FE - Fofst - (Fbias)

TEin = TE - Tofst

(FE/TE : ADC DATA, FEin/TEin : LOOP FILTER INPUT DATA)

FE

(from RF) pin

x(-N)

fs

FinG

OFA

cmd

FE

+

Fofst

OFFSET AVG

FILTER

+

FEin FOCUS LOOP

FILTER

Fbias

FOD

pin

Execution COMMAND

 OFAcmd(B1xxxx)

 Laser on/off selection is possible during offset measurement. If FOK is already on, the lens is automatically

moved up/down until free of FOK.

Related Register

Register

Fofst

Tofst

Toffset K0

Toffset K

tOFa

Address

1082

1084

003C

003D

0058

Function

Focus Offset Data Save

Tracking Offset Data Save

New data gain of the offset average value filter (K0 = 1-K)

Old data gain of the offset average value filter

Offset Measurement Time

 Average Value Filter :

The average value filter has basically the same configuration as the integrating filter, except K0 must always

have the value of 1-K. For example, if K0 = 0040, a new average value is found by adding the new input's

1/512 and the previous average 511/512. (If the input is DC, it is maintained for the output without any

changes in the gain.)

22

Share Link: