301020013 datasheet(33/109 Pages) AMSOSRAM

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301020013 датащи(PDF) 33 Page - ams-OSRAM AG

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Functional description

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DS000444 • v5-00 • 2025-Aug-29

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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

ADC End Range

ADC Step

ADC Black Level

ADC Threshold 3

ADC Threshold 2

ADC Threshold 1

Analogue Voltage Range

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