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Original question:

[FAQ] ADS129x: What is the minimum frequency for my SCLK?

[FAQ] ADS1298R: How are the lead-off comparator thresholds set?

Ryan Andrews
Guru 62916 points

Tool/software:

In the ADS129x family, a 4-bit DAC is used to set the lead-off detection threshold for the positive and negative channels inputs. The DAC settings are configured writing to COMP_TH[2:0] in the LOFF control register. The threshold voltages are relative to the total analog supply voltage and normalized to AVSS.

For example, when COMP_TH[2:0] = 000b:

Positive Threshold = 0.95 * [AVDD - AVSS] + AVSS

Negative Threshold = 0.05 * [AVDD - AVSS] + AVSS

 

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This post applies to ADS1191, ADS1192, ADS1291, ADS1292, ADS1292R, ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R, ADS1299-4, ADS1299-6, and ADS1299.