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LA9230 Arkusz danych(PDF) 10 Page - Sanyo Semicon Device

Numer części LA9230
Szczegółowy opis  Analog Signal Processor ASP for CD players
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Producent  SANYO [Sanyo Semicon Device]
Strona internetowa  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA9230 Arkusz danych(HTML) 10 Page - Sanyo Semicon Device

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11. DEFECT
The mirrored surface level is maintained by the capacitor for LF2 (pin 59); when a drop in the EFM signal (RFSM output)
reaches 0.35 V or more, a high signal is output to DEF (pin 49). If DEF (pin 49) goes high, the tracking servo enters THLD
mode. In order to prevent the tracking servo from entering THLD mode when a defect is detected, prevent DEFECT from
being output by either shorting DEF (pin 49) to GND, or shorting LF2 (pin 59) to GND. The DEFECT output is driven by
constant current (approximately 100 µA).
12. Microprocessor interface
Because the Reset (Nothing) command initializes the LA9230M and the LA9231M, it must be used carefully.
The LA9230M/LA9231M command acceptance (mode switching) timing is defined by the internal clock (4.23 MHz divided
to 130 kHz) after the falling edge of CE (RWC); therefore, when commands are sent consecutively, CE must go low for at
least 10 µsec. / The 4.23 MHz clock is required for that reason. 2BYTE-COMMAND DETECT and 2BYTE-COMMAND
RESET are used only for the purpose of masking two-byte data.
All instructions can be input by setting CE high and sending commands synchronized with the CL clock from the
microprocessor to DAT (pin 52) in LSB first format. Note that the command is executed at the falling edge of CE.
13. Reset circuit
The power-on reset is released when VCC exceeds approximately 2.8 V.
14. Pattern design notes
To prevent signal jump-in from CV
+ (pin 40) to RFSM (pin 41), a shielding line is necessary in between.
15. VCC /REF/GND/NC
VCC1 (pin 64)
: RF system
VCC2 (pin 56)
: SERVO system, DIGITAL system
AGND (pin 22)
: RF system, SERVO system
DGND (pin 45)
: DIGITAL system
NC (pins 46*, 47, 48, and 55)
: No connection
*Only for LA9230M
EFM signal
(RFSM output)
LF2 (pin 59)
DEF (pin 49)
Timing
*The DSP pin names are shown in parentheses.
LA9230M/9231M
No.5189 - 10/20


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