CS5376 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS5376

Low Power Multi-Channel Decimation Filter

Cirrus Logic 

CS5376

0x0F (decimal 5 to 15), depending on the available

time to settle the algorithm.

Once the EXP bits are written, the ORCAL bit (bit

14) in the FILT_CFG register is set to enable offset

calibration. When enabled, background noise mea-

surements are averaged using the exponential aver-

aging routine, with updated offset correction values

automatically written to the OFFSET registers.

When the exponential algorithm settles the OR-

CAL bit is cleared to disable offset calibration, and

the values in the OFFSET registers are no longer

updated. The last values written to the OFFSET

registers are used as the final offset correction val-

ues.

The characteristic equations for the exponential

offset calibration algorithm include an input value,

X, an output value, Y, a summation value, YSUM,

a sample index, n, and an exponential value, N.

Y(n) = X(n) - [YSUM(n-1) >> N]

YSUM(n) = Y(n) + YSUM(n-1)

Offset Correction = YSUM >> N

DS256PP1

67

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