cxa1782cq Sony Electronics, cxa1782cq Datasheet - Page 14
cxa1782cq
Manufacturer Part Number
cxa1782cq
Description
Rf Signal Processing Servo Amplifier For Cd Players
Manufacturer
Sony Electronics
Datasheet
1.CXA1782CQ.pdf
(31 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CXA1782CQ
Manufacturer:
SONY
Quantity:
11
Part Number:
CXA1782CQ
Manufacturer:
SONY/索尼
Quantity:
20 000
Description of Functions
RF Amplifier
The photo diode currents input to the input pins (PD1 and PD2) are each I-V converted via a 58k
resistor by the PD I-V amplifiers. these signals are added by the RF summing amplifier, and the photo diode
(A + B + C + D) current-voltage converted voltage is output to the RFO pin. An eye-pattern check can be
performed at this pin.
The low frequency component of the RFO output voltage is V
Focus Error Amplifier
The focus error amplifier calculates the difference between output VA and VB of the RF I-V amplifier, and
output current-voltage converted voltage of the photo diode (A + C – B – D).
The FEO output voltage (low frequency) is V
Be aware that the rotation of the focus bias volume has reversed for the usual CD RF IC.
1k
3.3µ
C
D
A
B
– (B + D)
– (A + C)
iPD1
iPD2
PD1
PD2
VB
VA
35
36
VC
VC
32k
32k
PD1 IV AMP
PD2 IV AMP
FEO
25p
VC
58k
58k
V
= 5.4
EE
87k
– 14 –
37
47k
VA
VB
(V
164k
A
– V
10k
10k
RFO
174k
25p
FE_BIAS
V
B
FE AMP
CC
) = (iPD2 – iPD1)
= 2.2
32
VC
(V
RF_M
1 FEO
A
RF SUMMING AMP
+ V
22k
B
) = 127.6k
315k .
31
RF_O
(iPD1 + iPD2).
CXA1782CQ/CR
equivalent