M66515FP データシートの表示（PDF） - Renesas Electronics

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M66515FP

Laser Diode Driver/Controller

Renesas Electronics 

M66515FP

7. VCC and GND pins

The VCC1 and VCC2 pins and the GND1 and GND2 pins are related to the power supply. The internal circuitry

connected to these pins is as follows.

VCC1, GND1: Connected to analog circuitry

VCC2, GND2: Connected to digital circuitry

The following should be taken into account in designing the actual wiring.

(1) Wiring widths should be as broad as possible, and drawn-out lengths of wiring should be avoided.

(2) The electrolytic capacitor for voltage stability should be positioned close to VCC1 and GND1.

(3) The bypass capacitor should be positioned close to VCC2 and GND2.

Important Information Regarding Peripheral Element Wiring

Peripheral elements necessary for M66515 operation should be positioned as close to the M66515 as possible.

Method of Calculating Power dissipation

The M66515 Power dissipation P is essentially given by the following formula.

P = ICC × VCC + I(RO) × I(RO) + I(LD) × V(LD)

Here V(RO) is the RO pin voltage, V(LD) is the LD pin voltage, I(RO) is the RO pin load current, and I(LD) is the LD pin

load current.

For example, when VCC = 5.25 V, V(RO) = V(LD) = 2.5 V, and I(RO) = I(LD) = 150 mA, the Power dissipation when the laser

is turned on and off is as follows.

(1) When the laser is on (DATA = “L”, ICC = 75 mA):

PON = 75 × 5.25 + 0 + 150 × 2.5 = 768.8 (mW)

(2) When the laser is off (DATA = “H”, ICC = 74 mA):

POFF = 74 × 5.25 + 0 + 150 × 2.5 = 763.5 (mW)

Rev.1.00, Sep.22.2003, page 5 of 11

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