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M66515FP Datasheet(PDF) 4 Page - Renesas Technology Corp |
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M66515FP Datasheet(HTML) 4 Page - Renesas Technology Corp |
4 / 12 page M66515FP Rev.1.00, Sep.22.2003, page 4 of 11 5. RO pin The RO pin is connected to the laser driving current load resistance; current essentially equal to ISW flows from this pin. The load resistance is connected between this pin and VCC; by this means the Power dissipation within the IC is reduced. However, the circuit operation requires that the voltage at this pin be 2.5 V or above. Hence if the maximum value of ISW is ISW(max), then the maximum value RO(max) of the load resistance RO is as follows. For example, if VCC(min)=4.75 V and ISW(max)=120 mA, then RO(max)=18.8 Ω. In other words, when setting the resistance RS such that the maximum value of ISW is 120 mA, RO should be 18.8 Ω or lower. 6. Sample-and-hold circuit (1) Summary of circuit operation The following is a summary of operation of the sample hold circuit within the M66515. A PD current arising upon LD light emission flows through the resistance connected between 1RM and 2RM, giving rise to a potential difference (VM). This VM is compared with the voltage applied to the pin Vr, and if VM<Vr, pin CH is a constant current source which charges the external capacitor. If VM>Vr, pin CH is a constant current sink which discharges the external capacitor. This operation is performed when the S /H input is "L" (sample); when the S/H input is "H", the CH pin is kept in the high-impedance state (hold), regardless of VM, Vr, and the DATA input state. Function table Input Switched state ENB S/H Vm, Vr SW1 SW2 Tr1 Output H X X OFF OFF ON Fixed at "L" L H X OFF OFF OFF High-impedance state (hold) LL VM < Vr ON OFF OFF Constant current source (sample) VM > Vr OFF ON OFF Constant current sink (sample) X: arbitrary (2) APC operation timing chart An example of an APC operation timing chart for a given sample hold control signal is shown below. In this example, a case is shown in which it is assumed that the direction of the leakage current of the CH pin in the hold state is the direction flowing out from the M66515 (the negative direction). |
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