Sony CXA2647N Datasheet
CXA2647N
RF Signal Processor for CD Players
Description
The CXA2647N is an RF signal processing IC for
compact disc players.
Features
• RF signal processor supporting 6× speed CD
• RF system VCA circuit
• RF system equalizer
• Supports pickups with built-in RF summing
amplifier
• Low current consumption mode (RF off mode)
• ROM/RW switching mode
• Center error amplifier
• Output DC level shift circuit
• TE balance adjustment function
Functions
• RF AC summing amplifier, equalizer, VCA
• RF DC summing amplifier
• Focus error amplifier
• Tracking error amplifier
• Center error amplifier
• Automatic power control
• VC buffer amplifier (analog block, digital block)
Absolute Maximum Ratings
• Supply voltage V
CC 7V
• Storage temperature Tstg –65 to +150 °C
• Allowable power dissipation
PD 620 mW
Operating Conditions
• Operating supply voltage range
VCC – GND 3.0 to 3.6 V
DV
CC – GND 3.0 to 3.6 V
(0V ≤ V
CC – DVCC < 2V)
• Operating temperature Topr –30 to +85 °C
– 1 –
E01997-PS
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.
30 pin SSOP (Plastic)
Pin Configuration
1 2 3 4 5 6 7 9 1211
20 192224252627282930
8 10 1413
18 172123
15
16
LD
PD
EQ_IN
AC_SUM
GND
A
B
D
SW
F
C
E
DVC
DV
CC
RFAC
DC_OFST
RFDCI
RFDC
VC
RFC
VFC
BST
V
CC
TE_BAL
CE
RFG
CEI
FEITEFE
– 2 –
CXA2647N
Block Diagram
VCC
gm
2625242334
RFC
15
RFAC
VFC
RFG
BST
EQ_IN
AC_SUM
AC_SUM VCA EQ
6
7
8
9
A
B
C
D
F
E
10
SW
12
PD
VC
VOFST
VC
VC
30
29
28
RFDC
RFDCI
21
CE
CEI
DC_OFST
RF off at V
CC
20
17
FE
FEI
13
DV
CC
16
TE_BAL
19
TE
18
11
2
LD
GND
V
CC
VC
1
5 22 27
DVC
14
APC
V
CC
VC
DVC
L: ROM
H: RW
L or H
DVC or Hi-Z
Sleep, APC off
VC
VOFST
VOFST
VC
DVC
ROM/
RW
ROM/
RW
ROM/
RW
ROM/
RW
VOFST
VC
ROM/
RW
ROM/
RW
DVC
DVC
gm
VC
VC
ROM/
RW
ROM/
RW
– 3 –
CXA2647N
Pin Description
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LD
PD
EQ_IN
AC_SUM
GND
A
B
C
D
E
F
SW
DV
CC
DVC
RFAC
FE
FEI
TE
TE_BAL
CE
CEI
VCC
RFG
BST
VFC
RFC
VC
RFDC
RFDCI
DC_OFST
APC amplifier output.
APC amplifier input.
RFAC system VCA block and EQ block input.
RFAC system RF_SUM output.
GND.
Signal A input.
Signal B input.
Signal C input.
Signal D input.
Signal E input.
Signal F input.
Mode switching signal input.
DVCC.
DVC output.
RFAC signal output.
Focus error signal output.
FE amplifier virtual ground.
Tracking error signal output.
TE balance adjustment.
Center error signal output.
CE amplifier virtual ground.
VCC.
RFAC system VCA block low frequency gain adjustment.
EQ boost level adjustment.
EQ cut-off frequency adjustment.
EQ cut-off frequency adjustment.
VC voltage output.
RFDC signal output.
RFDC amplifier virtual ground.
RFDC signal output offset adjustment.
O
I
I
O
I
I
I
I
I
I
I
I
I
O
O
O
I
O
I
O
I
I
I
I
I
I
O
O
I
I
Symbol I/O Description
– 4 –
CXA2647N
Pin Description
Pin
No.
Symbol I/O Equivalent circuit Description
1
10k
1k
600µA 100µA
2
55k
20k
10µA20µA10µA
20k
3
1.2k
VC
5k
VC
400µA 400µA
3.4k
2k
400µA 400µA 500µA
50
4
1
2
3
4
O
I
I
O
LD
PD
EQ_IN
AC_SUM
5 GND
APC amplifier output.
APC amplifier input.
Equalizer circuit input.
RFAC summing amplifier
output.
——GND.
– 5 –
CXA2647N
Pin
No.
Symbol I/O Equivalent circuit Description
6
7
100µA
10k
100µA
10k
400µA
50µA
VC
VC
30k
47k
100µA
50µA
100µA
47k
24k
100µA
8
9
100µA
100µA
30k
24k
10
11
VC100µA
200k
200k
200k
12
VC
14
100
100
25
6
IA
7IB
8I
C
9I
D
RFAC summing amplifier,
RFDC amplifier, focus error
amplifier and center error
amplifier input.
10
I
E
Tracking error amplifier input.
11IF
12 ISW
CD-ROM/SLEEP/CD-RW
switching input.
ROM when connected to GND,
RW when connected to DV
CC,
SLEEP mode when connected
to DVC or Hi-Z.
14 ODVC
(DV
CC + GND)/2 voltage
output.
13
—
—
DV
CC
Digital power supply.
– 6 –
CXA2647N
Pin
No.
Symbol I/O Equivalent circuit Description
15
100
1.4mA
15 ORFAC RFAC amplifier output.
17 IFEI
Focus error amplifier gain
adjustment.
The gain is adjusted by the
external resistance value
connected between this pin
and Pin 16.
50k
124
50µA 500µA
VC
16
124
17
16 OFE Focus error amplifier output.
19ITE_BAL
Input for adjusting the tracking
error amplifiers E and F gain
balance with the control
voltage.
63k
100µA 500µA
18
19
5k
50µA
45k
VC
18 OTE
Tracking error amplifier output.
21 ICEI
Center error amplifier gain
adjustment.
The gain is adjusted by the
external resistance value
connected between this pin
and Pin 20.
50k
124
VC
20
124
50µA 500µA
21
20 OCE Center error amplifier output.
– 7 –
CXA2647N
22
——
VCC VCC.
Pin
No.
Symbol I/O Equivalent circuit Description
19.5k
VC
23
100µA
50µA
20k
25µA
VC
24
19k
VC
25
100µA
124
10µA
1.5V
26
27
100
100
25
23 I
RFG
Input for setting the RFAC low
frequency gain with the
control voltage.
24 I
BST
Input for adjusting the
equalizer circuit boost level
with the control voltage.
25 I
VFC
Input for adjusting the
equalizer circuit cut-off
frequency with the control
voltage.
26 I
RFC
Input for adjusting the
equalizer circuit cut-off
frequency with the external
resistance.
27
O
VC
(V
CC + GND)/2 voltage
output.
Loading...