Hello Albin, The ADS1278-SP differential input impedance is directly proportional to the inverse of modulator frequency. Figure 65 in the datasheet provides the formula: Zeff = 14kOhm * (6.75MHz/fmod) Table 4 provides the relationship between modulator frequency fmod and input clock frequency fclk. The above calculated value for a specific modulator frequency is a typical value. Due to process variation, there can be a range of +/-20% from the typical. Regards, Keith Nicholas Precision ADC Applications
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