For Audio Equipment
MN6650A
Signal Processing LSI for CD Players
Overview
The MN6650A is a digital servo LSI for creating high-
precision servo systems with completely self-adjusting
focus, tracking, and traverse servos.
Pin Assignment
Features
Focus servo
Tracking servo
Traverse servo
Automatic adjustment functions for FO/TR gain, FO/
TR offset, and FO/TR balance
PWM output with tristate output from a single pin
Built-in dropout countermeasures
Anti-shock functions
Support for both linear motor and screw-based traverse
mechanisms
Function to prevent runaway traverse operation
Support for 3- and 1-beam systems
Support for double-speed playback
Microcomputer serial interface
Operating voltage 4.5 to 5.5V
XI
TO
T1
T2
T3
T4
T5
T6
VDET
TBAL
TRCRS
34
35
36
37
38
39
40
41
42
43
44
33
32
31
30
29
28
27
26
25
24
23
RST
TLOCK
FLOCK
SENSE
MLD
MCLK
MDATA
TRON
CLVS
V
SS
TEST
Applications
CD Players
QFP044-P-1010
TEST
PLAY
RFDET
DO
OFT
ARF
WVEL
PBO
TE
FE
VR2
1
2
3
4
5
6
7
8
9
10
11
22
21
20
19
18
17
16
15
14
13
12
KICK
TRD
FOOD
TVD
TRV
V
DD
AV
DD
AV
SS
V
SS
LDON
VR1
(TOP VIEW)
For Audio Equipment
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Symbol
TES
PLAY
RFDET
DO
OFT
ARF
WVEL
PBO
TE
FE
VR2
VR1
LDON
V
SS
AV
SS
AV
DD
V
DD
TRV
TVD
FOD
TRD
KICK
TEST
V
SS
CLVS
TRON
MDATA
MCLK
MLD
SENSE
FLOCK
TLOCK
RST
XI
T0
T1
T2
T3
I/O
O
O
I
I
I
I
O
I
I
I
I
I
O
I
I
I
I
O
O
O
O
O
I
I
I
O
I
I
I
O
O
O
I
I
O
O
O
O
Function Description
Tracking error shunt signal.
"H" level: shunt.
Play signal output.
RF detection signal input.
Dropout signal input.
Offtrack signal input.
RF signal input.
Double-speed status signal output.
Potentiometer signal input.
Tracking error signal input.
Focus error signal input.
"H" level: play.
"L" level: detected.
"H" level: dropout
"H" level: offtrack.
MN6650A
"H" level: double-speed.
(analog input)
(analog input)
(analog input)
Reference voltage for A/D converter. "L" level.
Reference voltage for A/D converter. "H" level.
Laser ON signal output.
Ground for digital circuits. (0 V)
Ground for analog circuits. (0 V)
Power supply for analog circuits. (+5 V)
Power supply for digital circuits. (+5 V)
Traverse forced feed output.
Traverse drive output.
Focus drive output.
Tracking drive output.
Kick pulse output.
Test pin. Keep this at "H" level.
Ground for digital circuits. (0 V)
Spindle servo phase synchronization signal output. "H" level: CLV.
"L" level: rough servo.
Tracking servo ON signal.
Microcomputer command data input.
Microcomputer command clock input.
(Data is latched at rising edge.)
Microcomputer command load signal input. "L" level: load.
Sense signal output. (OFT, FESL, NACEND, NAJEND, POSAD, and SFG)
Focus servo pull-in signal.
Tracking servo pull-in signal.
Reset input.
of 1.0 V
pp
.)
Test pin. Leave open.
Test pin. Leave open.
Test pin. Leave open.
Test pin. Leave open.
"L" level: pull-in state.
"L" level: pull-in state.
"L" level: reset.
"L" level: ON.
(tristate)
(tristate)
(tristate)
(tristate)
(tristate)
"H" level: ON.
Clock input. (f
XI
=16.9344 MHz) (Capacitor coupling requires a minimum
MN6650A
Pin Descriptions (continued)
Pin No.
39
40
41
42
43
44
Symbol
T4
T5
T6
VDET
TBAL
TRCRS
I/O
I
I
I
I
O
I
For Audio Equipment
Function Description
Test pin. Keep this at "L" level.
Test pin. Keep this at "L" level.
Test pin. Keep this at "L" level.
Vibration detection signal input. "H" level: vibration detected.
Tracking balance adjustment output.
Track cross signal input.
(tristate)
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