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CXA2647N Datasheet(PDF) 10 Page - Sony Corporation |
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CXA2647N Datasheet(HTML) 10 Page - Sony Corporation |
10 / 23 page – 10 – CXA2647N •EQ fc Control RFC LPF2 LPF1 HPF1 26 VFC Control Bias VC – 1V to VC + 1V Control Bias VC – 1V to VC + 1V 33k Ω to 100kΩ In Out 25 BST Boost Control 24 Amp The boost gain can be adjusted by adjusting the HPF1 gain. The cut-off frequency is adjusted by the RFC external resistance value and the VFC control voltage value. RFC resistance value: The cut-off frequency fc of each filter is adjusted by the Pin 26 external resistance value. The VFC voltage can be varied using this fc as the reference. VFC voltage: fc can be adjusted by the voltage applied to Pin 25. The cut-off frequency control characteristics are shown in the graph below. The boost gain can be adjusted by the BST (Pin 24) control voltage. The control characteristics are shown in the graph below. The boost gain stands for the increased gain from the low frequency gain in the fc frequency. VC – 1.0 VC BST voltage [V] VC + 1.0 Freq. Boost gain Gain fc 8dB –1dB 5dB VC – 1.0 VC VFC voltage [V] VC + 1.0 1.5fc fc 0.5fc RFC pin external resistor value 100k Ω: fc = 1.6MHz 33k Ω: fc = 4.8MHz • APC (Automatic Power Control) When the laser diode is driven by a constant current, the optical power output has extremely large negative temperature characteristics. Therefore, the current must be controlled to maintain the monitor photodiode output at a constant level. This control is performed by the APC function. 2 PD 1 LD 10k 55k 10k 1.25V 56k 56k VCC 10k 1k The EQ internal block diagram is shown below. The EQ is configured with the filter of the Bessel function of order 4. LPF1 = S2 + (17.085fc) S + 79.517fc2 79.517fc2 HPF1 = S2 + (17.085fc) S + 79.517fc2 S2 LPF2 = S2 + (12.412fc) S + 99.963fc2 99.963fc2 |
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