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PDF CXA2581N Data sheet ( Hoja de datos )
| Número de pieza | CXA2581N | |
| Descripción | RF Signal Processor for CD Players | |
| Fabricantes | Sony Corporation | |
| Logotipo |  |
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CXA2581N
RF Signal Processor for CD Players
Description
The CXA2581N is an RF signal processing IC for
compact disc players.
30 pin SSOP (Plastic)
Features
• Wide band RF signal processing
• RF system VCA circuit
• RF system equalizer (supports CAV mode)
• Supports pickups with built-in RF summing
amplifier
• Low current consumption mode (EQ Pass mode)
• RW/ROM 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 3.4 to 5.5
V
(0V ≤ Vcc – DVcc < 2V)
Note) Care should be taken for the operating voltage.
See page 18.
• 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–
E98739A97-PS
1 page  
CXA2581N
Pin
No.
Symbol
I/O
6A
7B
I
6
I
7
8C
I8
9D
9
I
Equivalent circuit
Description
100µA
15k
100µA
30k
RF summing amplifier and
focus error amplifier input.
100µA
100µA
47k
VC
47k
10 E
I
11 F
I
10
11
Tracking error amplifier input.
VC
12 SW
I
13 DVCC
—
14 DVC
O
200k
200k
12
200k
VC
—
150k
150k 25
14
CD-ROM/RW switching input.
RW when connected to VCC,
ROM when connected to GND.
Digital power supply.
(DVCC + GND)/2 voltage
output.
–5–
5 Page 
CXA2581N
• 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 RW/ROM switching and offset addition functions.
VC 100k
ROM
23.5k
A6
C8
B7
D9
ROM
VOFST
RW
30k
30k
30k
30k
47k
200k
FE = Gain { (B + D) – (A + C) }
Low frequency gain ROM: 16dB
RW: 28dB
RW
100k
ROM
47k
RW
200k
FEI 17
124
50k
DVC
16 FE
124
Cut-off frequency fc (typ.) ROM: 300kHz
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 RW/ROM switching and offset addition functions.
TE_BAL 19
20k
F
10
gm
20k 11 E gm
ROM
VOFST
VC RW
20k
63k
251k
10k
63k ROM
251k RW
DVCC
20k 10k
VC
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
DVC
External resistance value vs. Low frequency gain
Low frequency
gain [dB]
22
16
12.5
Resistance value [Ω]
10k 20k 30k
– 11 –
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet CXA2581N.PDF ] | |
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