m62481fp Mitsumi Electronics, Corp., m62481fp Datasheet - Page 23

• Manufacturer Part Number: m62481fp
• Description: Pickup Servo System With Automatic Adjustment
• Manufacturer: Mitsumi Electronics, Corp.

(20)A
(19)-2.V
Vref
1.Set R0,D7 (FZC OFF)=1.
2.Apply a voltage to pin8 (shock in) which is much above the comparetors threshold.
3.Set pin 24 (JP1/SG) to "H"
4.R0,D11=R0,D10 (Dout Mode)=0.
5.Apply Vref and no HF signal to pin 52 (C input).
6.Apply HF signal to pin 52 (C input).
7.Adjust ViA to Vref (=input to pin 53 (A input) via 60kohm resister).
8.Increase voltage at pin 53 and monitor the DOUT1 pin.
9.When the voltage at the DOUT1 pin changes,the threshold is found.
10.Threshold voltage can be monitored at pin35 (FE2+IN) and calculated as follows;
11.Apply Vref and no HF signal to pin 52 (C input).
12.Apply HF signal to pin 52 (C input).
13.Adjust ViA to Vref (=input to pin 54 (A input) via 60kohm resister).
14.Decrease voltage at pin 54 and monitor the DOUT1 pin.
15.When the voltage at the DOUT1 pin changes,the threshold is found.
16.Threshold voltage can be monitored at pin35 (FE2+IN) and calculated as follows;
D-62481-87I
0
V
V
Vi
FG1,2ON
FZC2 +
FZC2 -
FZC2 +
Vi=0.5mVrms
=Vpin35 - Vref
,A
=Vpin34 - Vref
FG1,2OFF
,V
FZC2 -
;
(G800);
t
PICKUP SERVO SYSTEM WITH AUTOMATIC ADJUSTMENT
(
MITSUBISHI
AFG ON (R0;D8=0,R3;D8=1,R3;D9=0)
AFG OFF(R0;D8=0,R3;D8=0,R3;D9=0)
23
ELECTRIC
/ 88 )
MITSUBISHI SOUND PROCESSOR LSI
47k
47k
FG1
FG2
M62481FP
+
V
REF
34
31
19
Vo
Vo
VREF=1/2Vcc
2k
2k
Vi
Vi
~
~