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PDF CXA2570N Data sheet ( Hoja de datos )
| Número de pieza | CXA2570N | |
| Descripción | RF Matrix Amplifier | |
| Fabricantes | Sony Corporation | |
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RF Matrix Amplifier
CXA2570N
Description
The CXA2570N is an IC developed for the RF signal
processing of compact disc players.
24 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 power consumption mode (EQ Pass mode)
• RW/ROM switching mode
Functions
• RFAC summing amplifier, equalizer, VCA
• RFDC summing amplifier
• Focus error amplifier
• Tracking error amplifier
• Automatic power control
• VC buffer amplifier
Applications
CD-ROM/RW compatible systems
Absolute Maximum ratings
• Supply voltage
Vcc
• Operating temperature Topr
• Storage temperature Tstg
• Allowable power dissipation
PD
7V
–20 to +75 °C
–65 to +150 °C
620 mW
Operating Conditions
• Supply voltage
Vcc – GND 3.0 to 5.5 V
• Operating temperature Topr
–20 to +75 °C
Structure
Bipolar silicon monolithic IC
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–
E98259A98-PS
1 page  
CXA2570N
Pin
No.
Symbol
I/O
6A
I
7B
8C
9D
6
I
7
I8
9
I
Equivalent circuit
Description
100µA
100µA
15k
30k
RF summing amplifier and
focus error amplifier input.
100µA
100µA
47k
VC
47k
10 E
11 F
16 TE
12 SW
I
27k 27k
10
I
11
O
124
16
Tracking error amplifier input.
Tracking error amplifier output.
200k
200k
I 12
200k
CD-ROM/RW switching input.
RW when connected to VCC,
ROM when connected to
GND.
13 RFAC
O
14 FE
O
15 FEI
I
2mA
100
13
RFAC amplifier output.
Focus error amplifier output.
50k 124
VC 14 Focus error amplifier gain
adjustment. The gain is
124
15
adjusted by the external
resistance value connected
between this pin and Pin 14.
–5–
5 Page 
CXA2570N
Description of Functions
• RFAC
The RF signal input by connecting capacitance to the EQ_IN pin is equalized, arithmetically amplified and then
output from the RFAC pin.
A6
B7
C8
D9
AC_SUM
4
AC
SUM
VCC
BST VFC
5.1k
19 20 21 RFC
0.1
RF 3
EQ_IN
RFG 18
RW/ROM
Low-frequency gain
AC_SUM: 16dB (both ROM/RW)
VCA to RFAC ROM: 2dB
RW: 14dB
EQ
Amp
When BST = VCC
13 RFAC
The EQ can be bypassed by connecting the BST control pin (Pin 19) to VCC. In this case only the EQ block
enters sleep mode and the low power consumption mode (slim mode) is activated. The low-frequency gain is
the same value as for EQ ON mode.
The RF_SUM input dynamic range is VC ± 300mV (typ.).
If RF (summing signal) is present at the pickup output pin, input the addition output signal to the EQ_IN pin
(Pin 3) coupled by capacitance.
When using a pickup without a summing output function, perform addition with the AC SUM block and then
input the signal to the EQ_IN pin coupled by capacitance.
RW/ROM switching is done by the VCA block, so either input method can be used without problem.
The RW gain is 12dB higher than the ROM gain.
The VCA low-frequency gain can be adjusted by
the RFG pin (Pin 18) voltage.
The control voltage vs. low-frequency gain
characteristics are shown in the graph to the right.
Gain [dB]
8
0
–8
VCA variable range
VC – 1
VC
The RFAC pin (Pin 13) is an NPN transistor emitter follower output.
The maximum drive current is approximately 2mA.
If the load capacitance distorts the output waveform, increase the drive current.
Connect resistance between Pin 13 and GND.
– 11 –
VC + 1
Vcut [V]
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CXA2570N.PDF ] | |
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