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SP8110

Rev 0.1 (12-03-03): SP8110 – Two-Channel Modulation IC

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INPUT CHARACTERISTICS: IA/IB INPUT CURRENT VS INPUT VOLTAGE

MODE SELECTION

IA current

IB current

Mode

> 2.65 mA

< 2.5 mA

LD_A output active

< 2.5 mA

> 2.65 mA

LD_B output active

> 2.65 mA

> 2.65 mA

Error

< 2.5 mA

< 2.5 mA

Power Save

PIN ASSIGNMENTS

Pin No.

Pin Name

Function

1

IA

Amplitude setting for output LD_A

2

IB

Amplitude setting for output LD_B

3

Modulation Frequency adjusting pin

(An external resistor is connected between this pin and ground.)

4

Vcc

Power supply pin

5

LD_B

Output pin of channel B

(Anode of laser diode is connected with this pin.)

6

GND

Ground pin

7

LD_A

Output pin of channel A

(Anode of laser diode is connected with this pin.)

8

Vcc_out

Power supply for LD_A and LD_B outputs

BOARD LAYOUT AND GROUNDING

To obtain the best performance from the SP8110, a printed circuit board with ground plane is

required. High quality, low series resistance ceramic 0.1uF bypass capacitors should be used at

the Vcc and Vcc_out pins (pins 4 and 8). Pin 8 should also have a 0.1uF bypass capacitor.

These capacitors must be located as close to the pins as possible. The traces connecting the

pins and the bypassing capacitors must be kept short and should be made as wide as possible.