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SM8610CV Datasheet(PDF) 7 Page - Nippon Precision Circuits Inc |
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SM8610CV Datasheet(HTML) 7 Page - Nippon Precision Circuits Inc |
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7 / 9 page  SM8610CV NIPPON PRECISION CIRCUITS INC.—7 Laser Diode Drive Current Mid-value Set Function The laser diode drive current mid-value can be adjusted by changing the resistance RLD connected between the LDISET and GND pins. The laser diode drive current mid-value base value ILDSET, given by the following equation, is set to the LDIOUT output current when the PDVIN voltage is in balance state (147 to 193mV). Note that the actual LDIOUT current may change due to feedback gain, and laser diode/photo diode variations. APC Loop Gain Setting The APC (Auto Power Control) loop gain can be adjusted by changing the external gain set resistance (RG) connected between the RG1 and RG2 pins. The PDVIN voltage-to-laser drive current open-loop gain is given approximately by the following equation. APC Loop Cutoff Frequency Setting The APC loop cutoff frequency fc is determined by the external resistance RG and the capacitance CG, con- nected between RG1 and RG2. If CG is connected between RG2 and VCC, the cutoff frequency is given as follows. RLD : LDISET connected resistance [Ω] ∆LDIOUT current /∆PDVIN voltage ratio [S] RG : Resistance connected between RG1 and RG2 [Ω] ILDSET = ILDSET × 1000 = RLD 800[V] [A] GmPDVIN = 9.1 × 10 −5 RG [S] fC1 = 2 πRGCG 1 [Hz] fC2 = 2 πRGCG 1 [Hz] 2 √ |
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Similar Description - SM8610CV |
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