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PDF LA9241M Data sheet ( Hoja de datos )
| Número de pieza | LA9241M | |
| Descripción | Analog Signal Processor ASP for CD players | |
| Fabricantes | Sanyo Semiconductor | |
| Logotipo |  |
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Ordering number: EN 5564
Monolithic Linear IC
LA9241M
Analog Signal Processor (ASP)
for CD players
Overview
The LA9241M is an analog signal processing and servo control
bipolar IC designed for use in compact disc players; a compact
disc player can be configured by combining this IC with a
CD-DSP such as the LC78622E and LC78620E, with a small
number of additional components required.
Package Dimensions
unit : mm
3159-QFP64E
[LA9241M]
Functions
I/V amplifier, RF amplifier (with AGC), SLC, APC, FE, TE
(with VCA and auto-balance function), focus servo amplifier
(with offset cancellation function), tracking servo amplifier
(with offset cancellation function), spindle servo amplifier
(with gain switching function), sled servo amplifier (with off
function), focus detection (DRF, FZD), track detection (HFL,
TES), defect detection, and shock detection.
Features
. The following automatic adjustment functions are built in.
. Focus offset auto cancel: FE (pin 20)
. Tracking offset auto cancel: TE (pin 7)
. EF balance auto adjustment
. RF level AGC function
. Tracking servo gain RF level following function
. Focus search smoothing setting pin: FSC (pin 46)
. EF balance adjustment variable range setting pin: (pin 47)
. Focus search mode switching pin: (pin 55)
SANYO : QFP64E
Specifications
Maximum Ratings at Ta = 25°C, Pins 22, 45 = GND
Parameter
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
VCC max
Pd max
Topr
Tstg
Conditions
Pin 56, 64
Ratings
7
350
–25 to +75
–40 to +150
Unit
V
mW
°C
°C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
13097HA(II)/83096HA(II) No.5564 - 1/21
1 page  
LA9241M
Continued from preceding page.
Pin
No.
Symbol
52 DAT
53 CE
54 DRF
55 FSS
56 VCC2
57 REFI
58 VR
59 LF2
60 PH1
61 BH1
62 LDD
63 LDS
64 VCC1
Contents
Microprocessor command data input pin.
Microprocessor command chip enable input pin.
RF level detection output (Detect RF).
Focus Search Select; focus search mode (± search/+search vs. the reference voltage) switching pin
Servo system and digital system VCC pin.
By-pass capacitor connection pin for reference voltage.
Reference voltage output pin.
Disc defect detection time constant setting pin.
RF signal peak hold capacitor connection pin.
RF signal bottom hold capacitor connection pin.
APC circuit output pin.
APC circuit input pin.
RF system VCC pin.
No.5564 - 5/21
5 Page 
Microprocessor Command List
MSB
COMMAND
LSB
0 0 0 0 0 0 0 0 RESET
0 0 0 0 1 0 0 0 FOCUS START
1 1 1 1 0 0 0 0 2BYTE-COMMAND DETECT
1 1 1 1 1 0 0 0 2BYTE-COMMAND DETECT
1 1 1 1 1 1 1 1 2BYTE-COMMAND RESET
1 0 0 1 0 0 0 0 FOCUS-OFFSET ADJUST START
1 0 0 1 0 0 0 1 FOCUS-OFFSET ADJUST OFF
1 0 0 1 0 0 1 0 TRACK-OFFSET ADJUST START
1 0 0 1 0 0 1 1 TRACK-OFFSET ADJUST OFF
1 0 0 1 0 1 0 0 LASER ON
1 0 0 1 0 1 0 1 LASER OFF : F-SERVO ON
1 0 0 1 0 1 1 0 LASER OFF : F-SERVO OFF
1 0 0 1 0 1 1 1 SPINDLE 8CM
1 0 0 1 1 0 0 0 SPINDLE 12 CM
1 0 0 1 1 0 0 1 SPINDLE OFF
1 0 0 1 1 0 1 0 SLED ON
1 0 0 1 1 0 1 1 SLED OFF
1 0 0 1 1 1 0 0 E/F BALANCE START
1 0 0 1 1 1 0 1 TRACK-SERVO OFF
1 0 0 1 1 1 1 0 TRACK-SERVO ON
LA9241M
Reset mode
Power-on mode
V
V
V
V
V
Non-adjusted
V
DSP
RESET(NOTHING)
FOCUS START #1
2BYTE-COMMAND DETECT
2BYTE-COMMAND DETECT
2BYTE-COMMAND RESET
—
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—
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Notes Concerning Microprocessor Program Creation
1. Commands
After sending the FOCUS START command and the E/F BALANCE START command, send 11111110 (FEH) in order to
clear the internal registers of the IC.
Reason: Although the above commands are executed at point 1 in the timing chart below, the same commands will be
executed again at point 2 if there is subsequent input to CE as shown below.
Timing
2 µs or more
2 µs or more
10 µs or more
1 µs or more
1 µs or more
‘‘FOCUS START’’ command
‘‘E/F BALANCE START’’ command
When sending a TRACK-OFFSET ADJUST START command or a FOCUS-OFFSET ADJUST START command after either
VCC ON (POWER ON RESET), RESET command, or a corresponding OFFSET ADJUST OFF command, waiting time is
necessary as listed below. (Only when a 4.2 MHz clock is input.)
TRACK-OFFSET ADJUST START: 4 ms or more
FOCUS-OFFSET ADJUST START: 4 ms or more
2. E/F balance adjustment
E/F balance adjustments should be made in a bit region of the disc, not a mirrored region.
Since there is no track-kick for LA9241M, measures must be taken during EF balance adjustment to obtain a stable TE
signal. (By a sled movement signal from a microprocessor, for example.)
No.5564 - 11/21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet LA9241M.PDF ] | |
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