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M66516FP Datasheet(PDF) 4 Page - Mitsubishi Electric Semiconductor |
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M66516FP Datasheet(HTML) 4 Page - Mitsubishi Electric Semiconductor |
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4 / 10 page  4 MITSUBISHI 〈DIGITAL ASSP〉 M66516FP LASER-DIODE DRIVER/CONTROLLER example, Vcc (min.) = 4.75 V and ILD(max.) = 150 mA, RO (max.) = 8.3 Ω. Accordingly, if the resistances of RC 1 to RC 3 is se- lected so as to gain a maximum laser drive current of 150mA, RO should be 8.3 Ω at the maximum. 5. ENB Input If laser current is controlled by the DATA input, the current source circuit is in operation even with zero laser current. If ENB input = “H”, all current source circuits go off including the bias current source. 6. APC Operation (1) Sample-hold circuit The following are a conceptual diagram and function table of the sample-hold circuit contained in the M66516. 4. RO Pin A load resistor for laser drive current is connected to the RO pin, through which a current almost equal to laser drive cur- rent flows in(when DATA = “H”). A load resistor is connected between the RO pin and Vcc to reduce power dissipated in the IC. Due to reasons related to the operation of circuits, the voltage at this pin should be 3.5V or higher. Consequently, the maximum resistance, RO (max.), of load resistor RO is: RO (max.) ( Ω) = where ILD (max.) is the maximum of laser drive current. If, for Conceptual Diagram: Sample-Hold Circuit Output Fixed to “L” High impedance state (hold) High impedance state (hold) Constant current sourcing (sample) Constant current sinking (sample) Input ENB H L L L S/H × H L L VM, Vr × × × VM < Vr VM > Vr Switch condition SW1 OFF OFF OFF ON OFF ×: Don’t care SW2 OFF OFF OFF OFF ON DATA × × H L Function Table Vcc (min.) – 3.5 [V] ILD (max.) [A] Reference voltage Vr VM Comparator + logic Control circuit S/H Sample-hold control input ENB SW1 SW2 CSH External capacitor Constant current source for charging Constant current source for discharging RM resistor voltage difference DATA Switching data Output |
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Similar Description - M66516FP |
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