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CXA2550N Datasheet(PDF) 10 Page - Sony Corporation |
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CXA2550N Datasheet(HTML) 10 Page - Sony Corporation |
10 / 15 page – 10 – 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. 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 + = 403k Ω E I-V amplifier feedback resistance value = (RE1 // R1) + RE2 + 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. 11 I-V F RF1 260k 30k I-V E 7 8 12p RF3 26k RF2 13k 96k 96k RE1 260k 12p RE2 13k RE3 26k 9 TE 30k EI 22k 4.7k 270k R1 R2 220k 220k RF1 × RF2 RF3 (RE1 // R1) × RE2 (RE3 // R2) |
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