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SP8034A Datasheet(PDF) 4 Page - Sipex Corporation |
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SP8034A Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 6 page 4 Rev. 5/14/03 SP8034A APC Amplifier with Integrated Photodetector © Copyright 2003 Sipex Corporation A major consideration in developing the optical pick-up head system is the extremely small form factor, which is additionally aggravated by the physical locations required by the light path. Special care must be taken when designing the Flex or PCB for this part. The output peak current requirement is in the order of 12.5 mA when driving 50pF of capacitive load with a slew rate of 250V/ µs. Therefore care must be taken to provide low inductance, low resistance paths for power and ground and output traces. Supply coupling is also very important. Good supply decoupling is important to ensure the high frequency performance of the system by eliminating supply lead inductance effects. The decoupling capacitor C1, as shown in Figure 5, should be as close to the part as possible. This capacitor should be 0.1 µF ceramic. C2 is optional to improve decoupling and is recom- mended to be 1 µF tantalum. The layout of the PCB is pictured here. Note the wide and short traces on the supply lines. The traces for the gain resistors RGAIN1 and RGAIN2 are kept as short as possible to avoid excessive parasitics. Any parasitics on these nodes will limit the performance of the system. RGAIN1 and RGAIN2 are subminiature potenti- ometers in the application. This is a single layer board using FR4 material. In order to minimize coupling capacitance into the gain setting resistor nodes, it is also critical that VOUT+ and VOUT- are routed away from the traces associated with the gain-setting resistors. 1 2 3 4 8 7 6 5 VCC GAIN RGCOM GND VOUT VREF RGAIN2 RGAIN1 RG1 400 RG1 400 RL 1k C2 0.1µF + + CL1 50pF RS Depends on FPC VREF VOUT + C1 0.1µF GAIN +5V SP8034A ® Figure 5. Test Circuit - Cload = 50p, V CC = 5V, Gain = 0V, Rgain = 400. VCC GAIN GND GND VO RL R2 R1 VREF CR PIN Figure 4. Evaluation Board. LAYOUT AND ROUTING CONSIDERATIONS |
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