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LV1605M Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LV1605M Datasheet(HTML) 8 Page - Sanyo Semicon Device |
8 / 24 page No. 7809-8/24 LV1605M Test Circuit Operational Description • APC (Automatic laser power control) This circuit is provided to control the pickup laser power. The laser on/off state is set by the microcontroller. • RF amplifier (eye pattern output) The (A + C) component of the pickup photodiode output current is input to FIN2 (pin 1), and the (B + D) component is input to FIN1 (pin 2). The input current is converted to a voltage. That signal is passed through the AGC circuit and output from the RFSM amplifier output RFSM pin (pin 48). The internal AGC circuit has a variable gain range of ±3 dB, and its time constant can be changed by adjusting the value of the external capacitor connected to PH1 (pin 50). The bottom level of the EFM signal (the RFSM output) is controlled, and the response of this function can be changed by adjusting the value of the external capacitor connected to BH1 (pin 59). The center value of the range of the AGC circuit is set by the value of the resistor inserted between RFSM (pin 48) and RFS- (pin 49). If required, these pins can also be used for EFM signal 3T compensation. When playing CD-RW discs, the input gain is increased when the IC receives a signal from the DSP that sets RW (pin 44) low. F2I FIN2 AGND DGND AGND AVCC DVDD AVCC FIN1 E F TB TE – TE TESI SCI TH TA TD – TD JP TO FD RFSM DRF DEF CLK CLOCK RW CE DAT CL INTI CLV HFL TJP TES TOFF TGL DGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 100k Ω 22k Ω 15k Ω 33k Ω 33k Ω F1I 100k Ω EI 180k Ω 56k Ω 2.2k Ω FI 180k Ω 10k Ω 10k Ω 0.01 µF REF 15k Ω REF 62k Ω 62k Ω 3300pF 100pF 3300pF + 0.01 µF 0.01 µF 10 µF + + 10 µF 0.01 µF 0.01 µF + 10 µF + 47 µF + A13933 LV1605M |
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