ADS7041IDCUT datasheet(21/43 Pages) TI2

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SCLK(fCLK-CAL)

Sample

SDO

Data for Sample N

Sample

N+1

tCONV

tCAL

tACQ

tPH_CS

tSU_CSCK

tD_CKCS

ADS7041

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SBAS675C – NOVEMBER 2014 – REVISED DECEMBER 2015

8.4.1.2 Offset Calibration During Normal Operation

Offset calibration can be done during normal device operation if at least 32 SCLK falling edges are provided in

one serial transfer frame. During the first 12 SCLKs, the device converts the sample acquired on the CS falling

edge and provides data on the SDO output. The device initiates the offset calibration on the 17th SCLK falling

edge and calibration completes on the 32nd SCLK falling edge. The SDO output remains low after the 12th

SCLK falling edge and SDO goes to 3-state after CS goes high. If the device is provided with less than 32

SCLKs during a serial transfer frame, the OCR is not updated. Table 3 provides the timing parameters for offset

calibration during normal operation.

For subsequent samples, the device adjusts the conversion results with the value stored in the OCR. The

conversion result adjusted with the value stored in the OCR is provided by the device on the SDO output.

Figure 38 shows the timing diagram for offset calibration during normal operation.

Table 3. Offset Calibration During Normal Operation

MIN

TYP

MAX

UNIT

fCLK-CAL

SCLK frequency for calibration for 2.25 V < AVDD < 3.6 V

MHz

fCLK-CAL

SCLK frequency for calibration for 1.65 V < AVDD < 2.25 V

MHz

tCAL

Calibration time during normal operation

15 tSCLK

tACQ

Acquisition time

235

tPH_CS

CS high time

tACQ

tSU_CSCK

Setup time: CS falling to SCLK falling

tD_CKCS

Delay time: last SCLK falling to CS rising

Figure 38. Offset Calibration During Normal Operation Timing Diagram

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