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Part: CXA1841AQ
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CXA1841AQ
Quadruple Speed RF Amplifier for CD Player and CD-ROM
Description The CXA1841AQ is an IC for RF signal processing of CD Player and CD-ROM. Features · Supports quadruple speed. (RF signal 8MHz) · RF equalizer (cosine equalization method) · Peak hold circuit time constant of mirror circuit can be adjusted. · APC (Automatic Power Control) function Absolute Maximum Ratings · Supply voltage · Operating temperature · Storage temperature · Allowable power dissipation Operating Conditions Supply voltage 48 pin QFP (Plastic)
Structure Bipolar silicon monolithic IC Applications · CD players · CD-ROM drive
VCC 7 V Topr 20 to +75 °C Tstg 65 to +150 °C PD 833 mW
+4.5 to +5.5 V
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
1
E95718A79
CXA1841AQ
Block Diagram
MON2 MON3 DLT2 DLT1 RE F LPF ADJ
25 24 RFD1
GM
DLT4
C DL
K4
K2
36 MON1 37
35
34 DL Bias
33 Gm Bias
32
31 DLT SEL
K1
30
29
28 Boost SEL
27
26 LPF Bias
50k EQ IN 38 VC VC RFI 39
5k 23 RFD0 DL1 Mix DL2 15k Mix Amp Fifth-order LPF 15k 50 21 VR 22 VC VC MODE SW
RFO 40 75k 39k RF () 41
VC
32k 75k 20k 40k
20 C EQ 4k BGR 40k 19 RF EQ Band Gap Regulator Vcc 18 VCC
VC2 42
VC VC VC VC 20k 40k VS Level Sift
GND 43 VC 4k
RF Drive Amp 44k 39k
BGR VC Mirr Comp Peak/ bot Hold Mirror Amp VC 40k 40k 56k 10k 55k 10k 160k 5P 10k 56k 1.25V Mirr T ADJ 10k 40k 1k 40k VC VC 54k 92k 20k 80k 80k Mirr 80k Dif
A 44
10k 10k 10k 10k
RF Summing Amp 10k VC 4P 174k Focus Error Amp 164k Tracking Drive Amp VC 36.7k 18k
20k
17 FOK
B 45
VC
80k
16 DFCT 1.3V
C 46
32k 32k 32k 32k 87k VC
15 CC2
D 47
4P Tracking Error Amp
14 CC1
FE Bias 48
13 CB
1
2
3
4
5
6
7
8
9
10
11
12
LD ON
LD
TE
T ON
F
TE1
PD
FE
Mirr T
2
Mirr
CP
E
CXA1841AQ
Pin Description Pin No. Symbol I/O Equivalent circuit Description
1 2
E F
I I
124 2 10µ
124 1
Tracking error amplifier input.
124 3
3
TE1
O
36.7k
Tracking error amplifier output and tracking error driver input.
10µ
160k
4
PD
I
4 124
APC amplifier input.
20µ
100µ
400µ 10k 5
5
LD
O
56k
1k
APC amplifier output.
25µ 124
50k
6
LD ON
I
6 50k 100k
APC amplifier ON/OFF switching. ON when connecting to GND; OFF when connecting to Vcc.
7
FE
O
174k 400µ
124 7
Focus error amplifier output. (B + D) (A + C) output.
3
CXA1841AQ
Pin No.
Symbol
I/O
Equivalent circuit
Description
8
TE
O
160k
124 8
Tracking drive amplifier output.
80k
9
T ON
I
9 20k vc
Peak hold time constant switching. ON when connecting to Vcc; OFF when connecting to GND.
120K
80k
10k
10
Mirr T
I
10 10k
Peak hold time constant adjustment. This is the time constant which is adjusted when Pin 9 is ON.
1.5k
100k
11
CP
I
Capacitor connection of Mirror hold. Non-inversion input of Mirror comparator.
11
124
12
Mirr
O
20k
12
Mirror comparator output.
VS 124 13 120k 1.5k
13
CB
I
Capacitor connection of Defect bottom hold.
4
CXA1841AQ
Pin No.
Symbol
I/O
Equivalent circuit
Description
14
CC1
O
124 14
Defect bottom hold output.
124 15
15
CC2
I
11k
43k
Input of Defect bottom hold output with capacitance coupled.
124
16
DFCT
O
20k
16
Defect comparator output.
20k 17
17
FOK
O
100k 100k
124
FOK comparator output.
18
VCC
Vcc.
1mA
19
RF EQ
O
40k
124 19
EQ output.
20
20
C EQ
I
1k 100µ 1k
Input of EQ hold amplifier with capacitance coupled.
40k
5
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