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FSP3303QAD Datasheet(PDF) 5 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
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FSP3303QAD Datasheet(HTML) 5 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
5 / 10 page 4 & 6 CHANNEL CHARGE PUMPS FOR WHITE LED BIAS 2007-4-10 5/10 FSP3302/FSP3303 DAC, and therefore the LED current, by 1dB. Once the maximum current level of 0dB is reached, an additional high to low transition on EN/PROG resets the DAC level to its minimum value of -31dB. Figure 2 demonstrates the EN/PROG serial protocol. Figure2. EN/PROG Serial Protocol To ensure proper DAC initialization, the first low pulse after programming is completed should be at least 5µs. SOFT START When enabled, the FSP3302/FSP3303 operate in a low power state for 330µs (tSS) to limit inrush current. After this time has expired, the devices operate in full-power mode. THERMAL SHUTDOWN In order to protect themselves under thermal overload and short circuit conditions, the FSP3302/FSP3303 incorporate thermal shutdown circuitry that monitors the die temperature and disables the IC if it exceeds 160°C. TYPICAL PERFORMANCE CHARACTERISTICS ( Circuit of Figure 1, VIN = 3.5V, TA = 25°C unless otherwise specified.) 30dB 29dB OFF OFF 31dB 31dB 30dB 29dB 28dB tHIGH tLOW tOFF t > tFINISH tLOW1 |
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