CS5531-AS datasheet(30/52 Pages) CIRRUS

30 / 52 page

CS5531/32/33/34

DS289PP5

2.4.1. Channel-Setup Register Descriptions

CS1-CS0 (Channel Select Bits) [31:30] [15:14]

Select physical channel 1 (All devices)

Select physical channel 2 (All devices)

Select physical channel 3 (CS5533/34 only)

Select physical channel 4 (CS5533/34 only)

G2-G0 (Gain Bits) [29:27] [13:11]

For VRS = 0, A = 2; For VRS = 1, A = 1; Bipolar input span is twice the unipolar input span.

000

Gain = 1, (Input Span = [(VREF+)-(VREF-)]/1*A for unipolar).

001

Gain = 2, (Input Span = [(VREF+)-(VREF-)]/2*A for unipolar).

010

Gain = 4, (Input Span = [(VREF+)-(VREF-)]/4*A for unipolar).

011

Gain = 8, (Input Span = [(VREF+)-(VREF-)]/8*A for unipolar).

100

Gain = 16, (Input Span = [(VREF+)-(VREF-)]/16*A for unipolar).

101

Gain = 32, (Input Span = [(VREF+)-(VREF-)]/32*A for unipolar).

110

Gain = 64, (Input Span = [(VREF+)-(VREF-)]/64*A for unipolar).

WR3-WR0 (Word Rate) [26:23] [10:7]

The listed Word Rates are for continuous conversion mode using a 4.9152 MHz clock. All word rates will

scale linearly with the clock frequency used. The very first conversion using continuous conversion mode

will last longer, as will conversions done with the single conversion mode. See the section on Performing

Conversions and Tables 1 and 2 for more details.

Bit

WR (FRS = 0)

WR (FRS = 1)

0000

120 Sps

100 Sps

0001

60 Sps

50 Sps

0010

30 Sps

25 Sps

0011

15 Sps

12.5 Sps

0100

7.5 Sps

6.25 Sps

1000

3840 Sps

3200 Sps

1001

1920 Sps

1600 Sps

1010

960 Sps

800 Sps

1011

480 Sps

400 Sps

1100

240 Sps

200 Sps

All other combinations are not used.

D31(MSB)

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

CS1

CS0

WR3

WR2

WR1

WR0

U/B

OL1

OL0

OCD

OG1

OG0

D15

D14

D13

D12

D11

D10

CS1

CS0

WR3

WR2

WR1

WR0

U/B

OL1

OL0

OCD

OG1

OG0

CSR

Setup 1

Bits <127:112>

Setup 2

Bits <111:96>

Setup 7

Bits <31:16>

Setup 8

Bits <15:0>

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