LC78637E Datasheet PDF - Sanyo Electric

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LC78637E
Sanyo Electric

Part Number LC78637E
Description CMOS IC
Page 20 Pages


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LC78637E
CMOS IC
for Compact Disc Player Applications
„ Overview
The LC78637E combines audio CD RF signal processing, servo control, EFM signal processing, audio
signal processing, and a CDTEXT decoder in a single chip, enabling a system to be configured with very
few peripheral components. The RF signal processing block performs such functions as EFM signal
generation, error signal generation, and laser power control. The servo control block carries out A/D
conversion of focus error and tracking error signals from the RF signal processing block, and digitally
performs focus, tracking, sled, and spindle servo processing necessary for CD servo operation. The
functions of the EFM signal processing block cover EFM signal demodulation and synchronization
detection, protection, and interpolation, de-interleaving, and error detection and correction. The audio signal
processing block handles data interpolation/mute processing based on the error correction situation, and
incorporates an 8X over sampling filter, 1-bit DAC, and secondary LPF (differential amplifier). The status
and characteristics of each function block can be set, or ascertained by data reads, via the microcomputer
interface.
„ Playback functions
— Playback speed: 1X speed, 2X speed
— Jitter-free playback (VCEC)
— CD-R/W: 1X speed, 2X speed
— Simple CLV playback
„ RF processing block
— RF system: AGC, CD-R, R/W playback supported, peak hold, bottom hold
— Error system: Variable-balance TE signal generation, FE signal generation
— Detection: Track counting signal, jitter, flaws (black, mirror)
— Laser power control
— DC offset voltage cancellation
„ Servo control block
— Digital processing of tracking, focus, sled, and spindle servos
— Automatic adjustment functions: Focus gain, focus bias, focus offset, tracking gain, tracking offset,
tracking balance
— Use of Sanyo’s original high-performance servo control technology* to improve playability, covering
external vibration and playback of warped or eccentric discs
— Shock detection
— Interruption detection
* Robust control technology developed by Sanyo, offering remarkable ability to suppress vibration
and shocks, and to achieve tracking of warped or eccentric discs
„ EFM processing block
— Error detection and correction
(C1 = twofold, C2 = fourfold/twofold)
— Jitter margin: ± 13 frames
— DOUT output
— Built-in text decoder
— EFM signal synchronization detection,
protection, interpolation
„ Audio processing block
— Interpolation (4 interpolations)
— Digital attenuator
— Built-in de-emphasis filter
— 1-bit DAC (tertiary ∆ Σ noise shaper system)
— Built-in 8X oversampling digital filter
— Fadeout function
— Bilingual function
— Built-in secondary LPF for audio output
— DF and DAC clocks can be supplied externally



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LC78637E
„ Power supply voltage and package
— Package
80-pin flat package
— Power supply voltage: 3.3 V
(5 V interface to microcomputer possible)
— Package Dimensions (unit: mm) SANYO: QFP80 (14×14)
( 0. 83)
60
61
17. 2
14. 0
0. 65
( 0. 83)
41
40
0. 15
80
1
0. 25
( 0. 8)
15. 6
21
20
( 2. 7)
0. 1
-2-



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„ Block Diagram
LC78637E
AIN
CIN
BIN
DIN
EIN
FIN
DEFECT
JITTC
SLCO
EFMIN
PDO1
PDO2
PCKIST
VVD
VVSS
SBCK/FG
XIN
XOUT
16MOUT
XVDD
XVSS
*RES
*WRQ
CL
CE
DI
DO
VDD5V
CONT1, 2, 3
CONT4, 5,
SBCK/CONT6
TEST
RF
SIGNAL
PROCESSOR
FOCUS
ERROR
PROCESSOR
TRACKING ERROR
PROCESSOR
MONITOR
PH
BH
RAM
DEFECT DET
VREF
LDD
APC
LDS
AVDD1
AVSS1
AVDD2
AVSS2
A/D SERVO
PROCESSEROR
TRACK JUMP
AUTO ADJUST
SLICE LEVEL
CONTROL
JITTER
DETECT
PLL
VCEC
CLV, CAV
CONTROL
SW D/A
DRF
S/H
RUPTURE DEFECT
VDD5
FRAME SYNC
DETECT, PROTECT INSERT,
EFM DECODE
CLOCK
GENERATOR
SUBCODE & TEXT DECODE
MONITOR SIGNAL SELECTOR
COMMAND
INTERFACE
GENERAL-PURPOSE
PORTS
8FS
DIGTAL FILTER
1bit DAC
ERROR
CORRECTION
AUDIO CD
C1-2, C2-2
INTERPOLATION
MUTE
ATTENUATION
DEEMPHSIS
LPF
RAM
AUDIO OUT
SERIAL
OUT
EXTERNAL
AUDIO IN
FDO
TDO
SLDO
SPDO
DRF
FSEQ
V/*P
VDD
VSS
MONI1 to 5
FSX/16MIN
C2F
EFLG
DOUT
LRSY
DATACK
DATA
ASLRCK
ASDACK
ASDFIN
-3-



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„ Pin Layout
LPF 1
AIN 2
CIN 3
BIN 4
DIN 5
AVSS1 6
AVDD1 7
FEC 8
RFMON 9
VREF 10
JITTC 11
EIN 12
FIN 13
TEC 14
TE 15
TEIN 16
AVSS2 17
AVDD2 18
LDD 19
LDS 20
LC78637E
60 DATA
59 DATACK
58 LRSY
57 ASDFIN
56 ASDACK
55 ASLRCK
54 16MOUT
53 EFLG
52 C2F
51 XVSS
50 FSX/16MIN
49 XIN
48 XOUT
47 XVDD
46 RVDD
45 RCHO
44 RVSS
43 LVSS
42 LCHO
41 LVDD
-4-



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