Harman Kardon HD 755 (serv.man9) Service Manual ▷ View online
AN8849SB
Head amplifier IC for CD-ROM drive (for 24 times speed or more)
■
Overview
The AN8849SB is a head amplifier IC for
digital servo. It can configure an efficient CD-ROM
system in combination with the MN662752, and
allows a full-automatic adjustment of tracking bal-
ance-gain-offset and focus balance-gain-offset with
fewer external parts.
system in combination with the MN662752, and
allows a full-automatic adjustment of tracking bal-
ance-gain-offset and focus balance-gain-offset with
fewer external parts.
Built-in functions are a variable equalizer, wide
band RF amp. and AGC which meet CAV playback
with 24 times speed or more.
with 24 times speed or more.
■
Features
•
Variable equalizer which meets CAV playback
with 24 times speed or more CAV playback.
with 24 times speed or more CAV playback.
•
Wide band RF amp. and AGC (f
C
=
20 MHz or
more (
−
3 dB))
•
Balance adjustment function built-in
Focus error amp./tracking error amp.
Focus error amp./tracking error amp.
•
CD-RW playback compatible.
Variable gain
Variable gain
Focus error amp./tracking error amp.
(to
(to
+
16.9 dB)
•
OFTR/BDO detection
•
APC amp.
■
Applications
•
CD/CD-ROM drive
SSOP036-P-0450A
Unit: mm
8.4±0.3
0.5
0.1±0.1
11.93±0.3
2.85±0.2
15.2±0.3
36
19
1
18
0.3±0.11
0.8
1.30±0.25
1.30±0.25
Seating plane
0.2
+0.10
–0.05
0
HD755
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AN8849SB
■
Block Diagram
12
3TOUT
11
CEA
17
NRFDET
10
ARF
9
CAGC
8
RFC
6
EQSW
5
RFOUT
3
RFN
LDON
19
GCTRL
28
FBAL
29
TEN
24
TEOUT
25
CROSS
21
CCRS
23
TBAL
30
V
CC2
7
V
CC1
4
GND
18
V
REF1
20
BDO
RF A
GC
BCA
RFDET
AC
EQ
ADD amp.
Amp.
32
35
36
V
REF2
22
PD
1
LD
2
FEOUT
27
FEN
26
OFTR
16
COFTR
15
BDO
14
CBDO
13
OFTR
Amp.
Comp.
BCA
GCA
ADD
amp.
Amp.
GCA
33
34
ADD
amp.
31
Amp.
BCA
BCA
GCA
GCA
ENV
detection
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22
AN8849SB
Pin No.
Description
18
GND pin
19
APC & masking control pin
20
V
REF1
output pin
21
CROSS output pin
22
V
REF2
output pin
23
Capacitor connection pin for CROSS
24
TE amp. inverted input pin
25
TE amp. output pin
26
FE amp. inverted input pin
27
FE amp. output pin
28
GCTRL pin
29
FBAL control pin
30
TBAL control pin
31
Tracking signal input pin 1
32
Tracking signal input pin 2
33
Focus signal input pin 4
34
Focus signal input pin 2
35
Focus signal input pin 3
36
Focus signal input pin 1
■
Pin Descriptions
Pin No.
Description
1
APC amp. input pin
2
APC amp. output pin
3
RF addition amp. inverted input pin
4
Power supply pin 1
5
RF addition amp. output pin
6
EQ characteristics control pin
7
Power supply pin 2
8
Capacitor connection pin for HPF of AGC input
9
AGC loop filter connection pin
10
AGC output pin
11
Capacitor connection pin for HPF amp.
12
3TENV output pin
13
Capacitor connection pin for RF dark-side
envelope detection
14
BDO output pin
15
Capacitor connection pin for RF right-side
envelope detection
16
OFTR output pin
17
NRFDET output pin
Parameter
Symbol
Rating
Unit
Supply voltage 1
*1
V
CC1
5.8
V
Supply voltage 2
*1
V
CC2
5.8
V
Supply current 1
*1
I
CC1
55
mA
Supply current 2
*1
I
CC2
2.5
mA
Power dissipation
*1, *2
P
D
333.5
mW
Operating ambient temperature
*1
T
opr
−
20 to
+
75
°C
Storage temperature
*1
T
stg
−
55 to
+
125
°C
■
Absolute Maximum Ratings
Note) *1: Except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for T
a
=
25
°
C.
*2: P
D
=
V
CC1
· I
CC1
+
V
CC2
· I
CC2
Parameter
Symbol
Range
Unit
Supply voltage 1
V
CC1
4.5 to 5.5
V
Supply voltage 2
V
CC2
3.0 to 5.5
V
■
Recommended Operating Range
Note) Apply voltage to satisfy V
CC2
−
V
CC1
<
0.3 V.
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AN8849SB
■
Electrical Characteristics at T
a
=
25
°
C
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Current consumption with no load 1
I
TOTAL1
V
CC1
=
5 V, V
CC2
=
3.3 V
28.4
40.6
52.8
mA
V
EQSW
=
V
REF2
+
0.75 V
Current consumption with no load 2
I
TOTAL2
V
CC1
=
5 V, V
CC2
=
3.3 V
1.20
1.72
2.24
mA
V
REF1
output voltage
V
REF1
V
CC1
=
5 V, V
CC2
=
3.3 V
2.27
2.50
2.73
V
V
REF2
output voltage
V
REF2
V
CC1
=
5 V, V
CC2
=
3.3 V
1.50
1.65
1.80
V
Focus error amp.
Focus error amp.
V
FO
−
OF
V
CC1
=
5 V, V
CC2
=
3.3 V
−
90
0
90
mV
output offset voltage
Focus error offset balance
V
FO
−
OFB
V
CC1
=
5 V, V
CC2
=
3.3 V
−
150
0
150
mV
crosstalk amount
V
FB
=
V
REF2
±
0.5 V
Focus error amp.
G
FO
V
CC1
=
5 V, V
CC2
=
3.3 V
12.3
14.4
16.5
dB
V-V conversion gain
V
GC
=
V
REF2
−
0.75 V
Focus error amp.
∆
G
FO
V
CC1
=
5 V, V
CC2
=
3.3 V
−
1.5
0
1.5
dB
V-V conversion relative gain
V
GC
=
V
REF2
−
0.75 V
Focus error amp.
B
FO1
−
H
V
CC1
=
5 V, V
CC2
=
3.3 V
1.08
1.35
1.62
balance output 1
−
H
V
FB
=
V
REF2
+
0.5 V
Focus error amp.
B
FO1
−
L
V
CC1
=
5 V, V
CC2
=
3.3 V
0.45
0.65
0.85
balance output 1
−
L
V
FB
=
V
REF2
−
0.5 V
Focus error amp.
B
FOH
V
CC1
=
5 V, V
CC2
=
3.3 V
4.35
6.35
8.35
dB
balance relative output 2
−
H
V
FB
=
V
REF2
+
0.5 V
Focus error amp.
B
FOL
V
CC1
=
5 V, V
CC2
=
3.3 V
−
8.35
−
6.35
−
4.35
dB
balance relative output 2
−
L
V
FB
=
V
REF2
−
0.5 V
Focus error amp.
G
FOF
V
CC1
=
5 V, V
CC2
=
3.3 V
−
4.5
−
3.0
−
1.5
dB
frequency characteristics
f
=
3 kHz, 60 kHz
Focus error amp.
B
FO4
V
CC1
=
5 V, V
CC2
=
3.3 V
3.3
4.3
5.3
GCTRL gain ratio
×
4
V
GC
=
V
REF2
Tracking error amp.
Tracking error amp.
V
TR
−
OF
V
CC1
=
5 V, V
CC2
=
3.3 V
−
60
0
60
mV
output offset voltage
Tracking error offset balance
V
TR
−
OFB
V
CC1
=
5 V, V
CC2
=
3.3 V
−
200
0
200
mV
crosstalk amount
V
TB
=
V
REF2
±
0.5 V
Tracking error amp.
G
TR
V
CC1
=
5 V, V
CC2
=
3.3 V
12.2
14.3
16.4
dB
V
−
V conversion gain
V
GC
=
V
REF2
−
0.75 V
Tracking error amp.
∆
G
TR
V
CC1
=
5 V, V
CC2
=
3.3 V
−
1.5
0
1.5
dB
V
−
V conversion relative gain
V
GC
=
V
REF2
−
0.75 V
Tracking error amp.
B
TR1
−
H
V
CC1
=
5 V, V
CC2
=
3.3 V
0.45
0.65
0.85
balance output 1
−
H
V
TB
=
V
REF2
+
0.5 V
Tracking error amp.
B
TR1
−
L
V
CC1
=
5 V, V
CC2
=
3.3 V
1.08
1.35
1.62
balance output 1
−
L
V
TB
=
V
REF2
−
0.5 V
HD755
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