BA6387K
Optical disc ICs
Preservo amplifier for CD players
BA6387K
The BA6387K is a preservo amplifier for CD players. By using this paired with a ROHM DSP, a servo and main signal system can be configured with few external components and low power consumption.
!Applications CD players
!Features 1) Internal RF and AGC circuits. 2) Internal APC circuit. 3) Internal auto asymmetry circuit.
4) Internal disc defect detector. 5) Internal focus protect function against disc defects.
!Absolute max.
Preservo amplifier for CD players
BA6387K
Optical disc ICs
Preservo amplifier for CD players
BA6387K
The BA6387K is a preservo amplifier for CD players. By using this paired with a ROHM DSP, a servo and main signal system can be configured with few external components and low power consumption.
!Applications CD players
!Features 1) Internal RF and AGC circuits. 2) Internal APC circuit. 3) Internal auto asymmetry circuit.
4) Internal disc defect detector. 5) Internal focus protect function against disc defects.
!Absolute maximum ratings (Ta = 25°C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 9 400* -25~+75 -55~+125 Unit V mW ˚C ˚C
* Reduced by 4mW for each increase in Ta of 1˚C over 25˚C.
!Recommended operating conditions (Ta = 25°C)
Parameter Power supply voltage Symbol VCC Limits 2.4~5.5 Unit V
BA6387K
Optical disc ICs
!Block diagram
CAGC RFO ASY PLH BLH RFRFI VCC
24
23
22
21
20
19
18 18
17
45µ B 2k 25 2k 60k
− +
20k
EFM
20k
−
+
DET BLOCK
16
20k
A 26
20k
− +
10k 44.7k
PS PL
BL BS MIRR
20k
20k
20k
20k
2k 2k
− +
60k
10k
+ −
15
39k
C 27
39k
+
−
44.7k 0.6V
+ −
+
DEFECT 14
160k
+
−
30p
D 28
−
FE 13 SCRATCH CONTROL FOK
160k
30p
+
−
FOK HOLD BLOCK
29 LOOP ON VB
+
10k
FEB
FOK 12
100k 100k
−
FOCUS BIAS FOCUS SWITCH GAIN 6dB 5p TEO 20k BL 20k
− + + −
FON RAMP OSC 11
+
−
30
0.2V
FE' 31
TE TEO 13.3k 10
+ −
10k 50k 12p
− +
2k 32 2k
402k
+ −
10k 12p
50k 5p
18
100k
E.