CS5531-AS datasheet(27/52 Pages) CIRRUS

27 / 52 page

CS5531/32/33/34

DS289PP5

to limit drive currents to less than 20

µA to reduce

self-heating of the chip. These outputs are powered

from VA+ and VA-. Their output voltage will be

limited to the VA+ voltage for a logic 1 and VA-

for a logic 0.

2.3.7. Offset and Gain Select

The Offset and Gain Select bit (OGS) is used to se-

lect the source of the calibration registers to use

when performing conversions and calibrations.

When the OGS bit is set to ‘0’, the offset and gain

registers corresponding to the desired physical

channel (CS1-CS0 in the selected Setup) will be ac-

cessed. When the OGS bit is set to ‘1’, the offset

and gain registers pointed to by the OG1-OG0 bits

in the selected Setup will be accessed. This feature

allows multiple calibration values (e.g. for different

gain settings) to be used on a single physical chan-

nel without having to re-calibrate or manipulate the

calibration registers.

2.3.8. Filter Rate Select

The Filter Rate Select bit (FRS) modifies the output

word rates of the converter to allow either 50 Hz or

60 Hz rejection when operating from a 4.9152

MHz crystal. If FRS is cleared to logic 0, the word

rates and corresponding filter characteristics can be

selected (using the Channel Setup Registers) from

7.5, 15, 30, 60, 120, 240, 480, 960, 1920, or 3840

Sps when using a 4.9152 MHz clock. If FRS is set

to logic 1, the word rates and corresponding filter

characteristics scale by a factor of 5/6, making the

selectable word rates 6.25, 12.5, 25, 50, 100, 200,

400, 800, 1600, and 3200 Sps when using a 4.9152

MHz clock. When using other clock frequencies,

these selectable word rates will scale linearly with

the clock frequency that is used.

VR E F

C = 22pF

φ Fine

≤ 15 m V

i= fV

φ Coarse

MCLK

VRS = 1; 1 V ≤ V

≤ 2.5 V

REF

Figure 9. Input Reference Model when VRS = 1

VR EF

C= 1 1p F

φ Fine

≤ 30 m V

i= fV

φ C oarse

MCLK

VRS = 0; 2.5 V < V

≤ VA+

REF

Figure 10. Input Reference Model when VRS = 0

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