CXA2550M 데이터 시트보기 (PDF) - Sony Semiconductor
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CXA2550M Datasheet PDF : 15 Pages
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CXA2550M/N
Tracking Error Amplifier
Each signal current from the photodiodes E and F is I-V converted and input to Pins 7 and 8 via a resistor
which determines the gain. The signal is amplified by the gain amplifier, operated by the tracking error
amplifier and then the (F-E) signal is output to Pin 11.
220k F
I-V
7
220k E
I-V
8
RF1 260k RF2 13k
12p
RF3
96k
26k
30k
30k
96k
RE1 260k RE2 13k
12p
RE3
26k
9
EI
270k 22k 4.7k
R1
R2
11 TE
The balance adjustment is performed by varying the combined resistance value of the feedback resistors,
which are T type-configured at the E I-V amplifier, by using the external resistance value of EI pin.
F I-V amplifier feedback resistance value = RF1 + RF2 +
RF1 × RF2
RF3
= 403kΩ
E I-V amplifier feedback resistance value = (RE1 // R1) + RE2 + (RE1 // R1) × RE2
(RE3 // R2)
Leave EI pin open when the balance adjustment is not executed in this IC.
The gain for F I-V and E I-V amplifiers becomes the same when EI pin is left open.
– 10 –
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