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PDF CXA2647N Data sheet ( Hoja de datos )
| Número de pieza | CXA2647N | |
| Descripción | RF Signal Processor for CD Players | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA2647N
RF Signal Processor for CD Players
Description
The CXA2647N is an RF signal processing IC for
compact disc players.
30 pin SSOP (Plastic)
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
VCC
• Storage temperature Tstg
• Allowable power dissipation
PD
7
–65 to +150
620
V
°C
mW
Operating Conditions
• Operating supply voltage range
VCC – GND 3.0 to 3.6
V
DVCC – GND 3.0 to 3.6
V
(0V ≤ VCC – DVCC < 2V)
• Operating temperature Topr –30 to +85 °C
Pin Configuration
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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–
E01997-PS
1 page  
Pin
No.
Symbol
I/O
Equivalent circuit
CXA2647N
Description
6A
7B
8C
9D
10 E
11 F
12 SW
13 DVCC
I
6
100µA
10k
10k
100µA
400µA
7
I 100µA
30k
RFAC summing amplifier,
8
100µA
RFDC amplifier, focus error
47k amplifier and center error
amplifier input.
47k
50µA
100µA
I
9
VC
100µA
30k
24k
I
24k
50µA
100µA
VC
I
10
11 Tracking error amplifier input.
I
100µA
VC
200k CD-ROM/SLEEP/CD-RW
200k
I
12
200k
switching input.
ROM when connected to GND,
RW when connected to DVCC,
SLEEP mode when connected
VC to DVC or Hi-Z.
— — Digital power supply.
14 DVC
O
100
100 25
14
(DVCC + GND)/2 voltage
output.
–5–
5 Page 
CXA2647N
• Focus Error
The signals input to the A and C pins and the B and D pins are arithmetically amplified and the focus error
signal is output.
This circuit has ROM/RW switching and offset addition functions.
VC 100k
ROM
23.5k
A6
C8
B7
30k
30k
30k
D9
ROM
VOFST
RW
30k
47k
200k
FE = Gain { (B + D) – (A + C) }
Low frequency gain ROM: 15.5dB
RW: 27.5dB
RW
100k
ROM
47k
RW
200k
FEI 17
124
50k
DVC
16 FE
124
Cut-off frequency fc (typ.) ROM: 400kHz
RW: 300kHz
• Tracking Error
The signals input to the E and F pins are arithmetically amplified and the tracking error signal is output.
This circuit has ROM/RW switching and offset addition functions.
VC
Control bias
VC – 1V to VC + 1V
TE_BAL 19
20k
F
11
gm
ROM
VOFST
VC RW
20k
63k
251k
10k
63k ROM
251k RW
20k 10 E gm
VC
20k 10k
31.5k
125.5k
ROM RW
TE = Gain (F – E)
Low frequency gain ROM: 16dB
RW: 28dB
18 TE
TE balance adjustment
(F – E) low frequency gain = ±6dB
Cut-off frequency fc (typ.)
ROM: 200kHz
RW: 150kHz
VC
External resistance value vs. Low frequency gain for E and F input pins
22
15.5
12.5
10k
20k
Resistance value [Ω]
– 11 –
30k
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet CXA2647N.PDF ] | |
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