Transcript
CXA1571 MIN
SONY; RF Amplifier for CD Player Description
CXA1517M 20 pin SOP (Plastic)
The CXA1571 MIN is developed for CD player usage. This IC integrates an APC circuit and RF. focus error and tracking error amplifiers for the 3-spot optical pick up output.
CXA1517N 20 pin VSOP (Plastic)
Features • Low power consumption (at ± 5V. 60mW) • Built-in APC circuit • Both single +5V and dual ± 5V power supply operations possible • APC circuit and various amplifiers gain interchangeable with CXA1081
Functions • • • •
Applications Compact disc players
Operating Condition Supply voltage
Vce-VEE
Structure
V
3.6 to 11.0
RF amplifier Focus error amplifier Tracking error amplifier APC circuit
Bipolar silicon monolithic IC
Absolute Maximum Ratings (Ta=25"C) • • • •
Supply voltage Vee-VEE 12 V Operating temperature Topr -20 to +75 "C Storage temperature Tstg -65 to + 150°C Allowable power dissipation Po (SOP) 600 mW (VSOP) 375 mW
Block Diagram and Pin Configuration (Top View) ~
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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 nght. Application Circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems anslng out of the use of these cirCUits
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. . 8382383 0007183 104 . .
E91801 - ST
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SONY
CXA1571M/N
Pin Description Pin No.
Symbol
I/O
1
LD
o
2
PD
Equivalent circuit
Output pin of APC amplifier.
Input pin of APC amplifier.
10K
3 4
PD1 PD2
Description
Inversion input pins of RF I-V amplifier. Connect respectively to A+C and B+D photo diode pins. Current generated in the photo diode is converted to voltage inside the IC.
® @-+----t
12P
I6 7
F-IN E-IN
. . 8382383 0007184 040 . .
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Inversion input pins of F, E I-V amplifier. Connect respectively to photo diode F. E. Current generated in the photo diode is converted to voltage inside the IC.
SONY Pin No.
CXA1571M/N
I/O
Symbol
Equivalent circuit
Description
~
~ 120
-f-
.. -.. 50
8
VR
0
8
(yCC+VEE)/2 DC voltage 'Output pin.
~.
~.
~ -..
120
tr
9
12
VC
VC midpoint voltage input pin. Connect to GND when dual ± 5V power supply is used. Connect to VR pin when single +5V power supply is used.
I
0
EO
~~ 12
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13
--
EI
~
96K AI. tV
30K
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12 P
Output pin for I-V amplifier E monitor.
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~~
260K
13
v
r-
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I
. . 8382383 0007185 T87 . .
1
-3-
Gain adjustment pin for I-V amplifier E.
SONY Pin No.
14
D
t
o 33p/6.3v
FOCUS BIAS
47k
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• For single +5V power supply a: 0-
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VC
22k
19
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17
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16
15
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13
12
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9
10
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z
33J,J/63v
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. . 8382383 0007190 344 . .
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SONY
CXA1571M/N
Description of Function RF Amplifier Photo diode current input to input pins (P01 and P02) is respectively converted to I-V in the PO IV amplifier, by means of a 58kQ equivalent resistance. Furthermore, it is added to RF summing amplifier and the output voltage, converted from photo diodes (A+B+C+O) current to voltage, is output to RFO pin. Eye-pattern check is possible through this pin.
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lK
22K
I I
L __ _
S8K
10K
VA
RF SUMMING AMP 10K
vB IV AMP f\
)
RFO output voltage low frequency turns to VRFO=2.2 x (VA+VB) =127.6kQ x (iP01 +iP02).
Focus Error Amplifier The difference between outputs VA and VB of RF I-V amplifier is obtained to have the voltage converted from current to voltage of photo diodes (A+C-B-O) output. 25P
174K
VB
32K
- ( B + D) - - . A J \ I l I r - - - - - - - f
32K -(ATC)
VA
I
15
-
FE BIAS - - -
I I -
VEE--~JA---vcc 47K
FE output voltage (low frequency) turns to VFE=S.4 x (VA-VB) = (iPD2-iPD1) x 315kQ .
. . 8382383 0007191 280 . .
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-
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SONY
CXA1571M/N
Tracking Error Amp~ifier
~
Photo diode current input to Pins E and F is converted from current to voltage at IV amplifier of E and F respectively.
;'.
1K 3.3)1
H
260K
TE AMP 12P
VF
30K
~
~
30K
~ (D
N
260K
_ _ _ _ _ .-J
The difference between VE and VF is obtained at the tracking error amplifier. This amplifier output is the current difference between photo diodes E and F converted into voltage output VTE= (VE-VF) x 3.2 = (iE-iF) x 1290kQ .
. . 8382383 0007192 117 . . -10-
SONY
CXA1571M/N
Midpoint Voltage Generating Circuit Supplies midpoint voltage when CXA 1571 is used with single power supply. Maximum current stands around ± 3mA and output impedance at about 50 Q . Vee
J
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0
t
