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301020013 数据表(PDF) 33 Page - ams-OSRAM AG |
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301020013 数据表(HTML) 33 Page - ams-OSRAM AG |
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33 / 109 page  Dragster Functional description Datasheet • PUBLIC • Document Feedback DS000444 • v5-00 • 2025-Aug-29 33 / 109 / 7.4.3 ADC companding mode An alternative to running the ADC at higher clock rate is to use the ADC companding mode. As for an optical signal, the photon shot noise increases with signal level, a very small quantization step is only required at the very low signal values. For higher impinging optical signals, the ADC quantization step can be increased such as to match the shot noise present in the light signal. This may significantly reduce the total ADC time required to generate a 12- bit value, while no information is lost. Figure 15 and Figure 16 illustrates the companding ADC mode and the registers involved in programming it is response function. Figure 15: ADC transfer function in companding mode DN V ADC End Range ADC Step ADC Black Level ADC Threshold 3 ADC Threshold 2 ADC Threshold 1 Analogue Voltage Range |
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