ROHM BA6387K Datasheet
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
!
Parameter Symbol Limits Unit
Power supply voltage V
Power dissipation Pd 400
Operating temperature Topr -25~+75 ˚C
Storage temperature Tstg -55~+125 ˚C
Reduced by 4mW for each increase in Ta of 1˚C over 25˚C.
*
Recommended operating conditions
!
Parameter Symbol Limits Unit
Power supply voltage V
(Ta = 25°C)
CC
CC
9V
*
(Ta = 25°C)
2.4~5.5 V
mW
Optical disc ICs
Block diagram
!!!!
BA6387K
FEB
FE'
VB
B
25
A
26
C
27
D
28
29
30
31
E
32
RF-
45µ
2k 60k
2k
2k
2k
100k100k
2k
2k
260k
F
30p
20k
20k
−
CC
V
20k
+
−
HOLD BLOCK
PLH
BLH
CAGC
ASY
18
+
−
20k
DET BLOCK
20k
PS BSBLPL
20k
39k
20k
+
−
39k
20k
0.6V
+
+
−
+
−
FOK
SCRATCH
CONTROL
RFO
24 23 22 21 20 19 18 17
10k
−
+
44.7k
RFI
−
+
60k 10k
44.7k
−
+
30p
+
−
160k
160k
10k
LOOP ON
+
−
+
−
0.2V
TEO
+
10k
−
12p
402k
+
10k
−
12p
12345678
FO
5p
50k
−
+
50k
5p
AGND
BL 20k
PL 20k
FI
FOCUS BIAS
20k
−
+
20k
CAPC
FOCUS
SWITCH
RAMP
OSC
GAIN 6dB
+
−
100k1M
18
LD
13.3k
−
2.64k
+
MUTE
High=off
PD
R / H
FOK
TEO
EFM
16
MIRR
15
DEFECT
14
FE
13
FOK
12
FON
11
TE
10
SC
9
Optical disc ICs
Pin descriptions
!!!!
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin name
F
FO
AGND
FI
CAPC
LD
PD
R / H
SC
TE
FON
FOK
FE
DEFECT
MIRR
EFM
Function
F input
F output
Analog GND
F gain adjustment feedback
For capacitor for APC phase
compensation
APC amplifier output
APC amplifier input
For capacitor for ramp wave/
loop off
For resistor for scratch depth
adjustment
Tracking error output
Focus on control
Focus OK comparator output
Focus error output 1
Defect signal output
Mirror signal output
EFM signal output
Pin No.
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Pin name
ASY
CAGC
BLH
PLH
CC
V
RFI
RFO
RF-
B
A
C
D
FEB
VB
FE'
E
BA6387K
Function
Auto-asymmetry control input
For capacitor for AGC constant
For capacitor for bottom long
For capacitor for peak long
Power supply
RF output capacity coupling
reinput
RF summing amplifier output
RF summing amplifier
feedback input
B input
A input
C input
D input
Focus error bias input
Bias amplifier output
Focus error output 2
E input
Optical disc ICs
BA6387K
Electrical characteristics
!
(unless otherwise noted, Ta = 25°C and V
Parameter
Quiescent current
〈Bias amplifier〉
Bias voltage
Maximum output high level voltage
Maximum output low level voltage
〈RF amplifier〉
Output offset voltage
Voltage gain
Maximum output high level amplitude
Maximum output low level amplitude
Cutoff frequency
〈FE amplifier〉
Output offset voltage
Voltage gain AC
Voltage gain BD
Voltage gain difference
Maximum output high level amplitude
Maximum output low level amplitude
Frequency characteristics
〈TE amplifier
〉
Output offset voltage
Voltage gain E
Voltage gain F
Voltage gain difference
Maximum output high level amplitude
Maximum output low level amplitude
Frequency characteristics
〈FOK comparator〉
Threshold voltage
Output high level voltage
Output low level voltage
Maximum operating frequency
〈Asymmetry amplifier〉
Output offset voltage
Voltage gain 1
Voltage gain 2
Maximum output high level amplitude
Maximum output low level amplitude
CC
Symbol Min. Typ. Max. Unit
∆G
V
V
V
V
G
G
V
V
V
V
V
V
V
V
F
V
V
V
V
I
I
OFRF
G
OHRF
F
OHFE
F
G
G
OHTE
OLTE
F
OHFK
MXFK
OFAS
G
G
OHAS
Q
I
OH
OL
RF
OLRF
CRF
OFFE
FEAC
FEBD
FE
OLFE
CFE
OFTE
TEE
TEF
TE
CTE
THFK
OLFK
1AS
2AS
OLAS
B
- 8.7 12.7 mA
1.12 1.38 V
3.0 -
3.0
-1.02 -0.78 V
21.0
0.90 - V
-80 0 80
0.90 1.10 -
1.25
-
-0.90
24.0
27.0
1.10
-
-1.10
-
-0.90
6
26 29 32
26
29 32 dB
-3 0 3
-mA
-
mA
dB
V
MHz
-
mV
dB
dB∆G
V
- -1.10 -0.90 V
19
-80
27 30 33
27 30 33
-3 0 3
0.90 1.10
- -1.10
19 22
-0.42
2.0
22 25
080
-0.90
25
-0.30
-0.18
--VV
- - 0.5
dB
mV
dB
dB
dB
-
V
V
dB
V
45 - - kHz -
-60 - 60
369
8.5 11.5 14.5
0.90 1.10 -
- -1.10 -0.90
mV
dB
dB Input pin 17, 80mV
V V7 = V
V V6 = V
= 2.5V)
Conditions
-
Bias fluctuation below 200mV
Bias fluctuation below 200mV
V8 = 0.8V, SG5 = 30mV
Simultaneous AC and BD input
B
+
V9 = V
0.25V, VB-0.05V
-3dB point
SG5 = 30mV
SG6 = 30mV
P-P
P-P
, 1kHz
, 1kHz
Measurement with AC and BD input
V9 (V10) = V
SG5 (SG6) = 60mV
SG1 = 30mV
SG2 = 30mV
B
±
P-P
P-P
0.15V
P-P, 60kHz
, 1kHz
, 1kHz
-
V1 = V
B
+
0.1V
B
+
V2 = V
SG1 (SG2) = 60mV
0.1V
P-P
Input pin 22
V7 = V
B
-0.42V
B
-0.18V
V7 = V
Input pin 22, 80mV
B
±
B
±
0.8
0.4
P-P
P-P
, 1kHz
, 1kHz
P-P
, 1kHz
, 60kHz
*
*
*
*
*
*
*
*
*
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