When the ADCs start converting for the first time after power-up or a device reset, the ADS131B04-Q1 selects the fast-settling filter to allow for settled output data generation with minimal latency. The fast-settling filter has the characteristic of a first-order sinc filter (sinc¹). After two conversions, the device switches to and remains in the sinc³ filter path until the next time the device is powered down or reset.

The fast-settling filter exhibits wider bandwidth and less stop-band attenuation than the sinc³ filter. Consequently, the noise performance when using the fast-settling filter is not as high as with the sinc³ filter. The first two samples available from the ADS131B04-Q1 after a supply ramp or reset have the noise performance and frequency response corresponding to the fast-settling filter as specified in the Section 6.5 table, whereas subsequent samples have the noise performance and frequency response consistent with the sinc³ filter. See the Section 8.4.2 section for more details regarding the fast start-up capabilities of the ADS131B04-Q1.