CS5541 datasheet(16/26 Pages) CIRRUS

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CS5541

DS500PP1

2.9.2 One Time Calibration followed by Con-

tinuous Conversions

After the first command instructing the ADC to en-

ter this mode is given, an offset calibration is per-

formed followed by a gain calibration. Then the

first data conversion is performed. Subsequent con-

versions do not include new calibrations. This al-

lows the ADC to provide maximum throughput for

the filter rate selected.

2.9.3 Continuous Conversions with Default

Calibration Coefficients

After the command instructing the ADC to enter

this mode is given, the ADC will utilize the initial-

ized values of the on-chip calibration registers

(Offset = 0, Gain = 1.0) for all conversions. This al-

lows the ADC to provide maximum throughput for

the filter rate selected. This mode is recommended

when the user is performing a system calibration.

2.9.4 Continuous Conversions with Existing

Calibration Coefficients

After the command instructing the ADC to enter

this mode is given, the ADC will use the coeffi-

cients from the previous calibration to calculate

conversions. If no prior calibration has been per-

formed since power-up, the ADC will use the de-

fault calibration coefficients (Offset = 0, Gain = 1).

The ADC performs conversions at the maximum

throughput for the filter rate selected.

2.9.5 Output Word Timing

Table 1 describes the output word timing of the

CS5541. D3-D0 are the last four bits of the com-

mand word issued, as described in Section 2.8.

Both td and to are represented graphically in Figure

11. td represents the amount of time for a conver-

sion to be completed, once a valid command is re-

ceived. to is the time required for all subsequent

conversions, before a new command is received.

“Throughput” is the rate at which those subsequent

conversions are output.

Notes: 26. td can be off by one MCLK cycle if SCLK is asynchronous to MCLK.

27. Throughput calculations assume that MCLK = 32.768 kHz.

D3-D0

td - First Output (cycles)

Note 26

to - Subsequent Outputs (cycles)

Throughput (SPS)

Note 27

0000

7358

4884

6.7093

0001

7358

2442

13.418

001x

2474

2442

13.418

0100

1550

1012

32.379

0101

1550

506

64.759

011x

538

506

64.759

100x

7358

610

53.718

101x

2474

610

53.718

110x

1550

126

260.06

111x

538

126

260.06

Table 1. Filter Output Word Rates

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