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CS5531-AS

16-bit and 24-bit ADCs withUltra-low-noise PGIA

Cirrus Logic 

CS5531/32/33/34-AS

TYPICAL RMS NOISE (nV), CS5531/32/33/34

(See notes 11, 12 and 13)

Output Word

Rate (Sps)

7.5

15

30

60

120

240

480

960

1,920

3,840

-3 dB Filter

Frequency (Hz)

1.94

3.88

7.75

15.5

31

62

122

230

390

780

x64

17

24

34

48

68

115

163

229

344

1390

x32

17

25

35

49

70

160

230

321

523

2710

Instrumentation Amplifier Gain

x16

x8

x4

19

26

42

27

36

59

39

51

84

54

72

118

77

102

167

276

527

1040

392

748

1480

554

1060

2090

946

1840

3650

5390 10800 21500

x2

79

111

157

222

314

2070

2950

4170

7290

43000

x1

155

218

308

436

616

4150

5890

8340

14600

86100

Notes: 11. Wideband noise aliased into the baseband. Referred to the input. Typical values shown for 25 °C.

12. For peak-to-peak noise multiply by 6.6 for all ranges and output rates.

13. Word rates and -3dB points with FRS = 0. When FRS = 1, word rates and -3dB points scale by 5/6.

TYPICAL NOISE-FREE RESOLUTION(BITS), CS5532/34 (See Notes 14 and 15)

Output Word -3 dB Filter

Instrumentation Amplifier Gain

Rate (Sps) Frequency (Hz) x64

x32

x16

x8

x4

x2

x1

7.5

1.94

19

20

21

22

22

22

22

15

3.88

19

20

21

21

21

22

22

30

7.75

18

19

20

21

21

21

21

60

15.5

18

19

20

20

20

21

21

120

31

17

18

19

20

20

20

20

240

62

16

17

17

17

17

17

17

480

122

16

17

17

17

17

17

17

960

230

15

16

16

16

16

16

16

1,920

390

15

15

15

15

15

15

15

3,840

780

13

13

13

13

13

13

13

14. Noise-free resolution listed is for bipolar operation, and is calculated as LOG((Input Span)/(6.6xRMS

Noise))/LOG(2) rounded to the nearest bit. For unipolar operation, the input span is 1/2 as large, so one

bit is lost. The input span is calculated in the analog input span section of the data sheet. The noise-free

resolution table is computed with a value of 1.0 in the gain register. Values other than 1.0 will scale the

noise, and change the noise-free resolution accordingly.

15. “Noise-free resolution” is not the same as “effective resolution”. Effective resolution is based on the

RMS noise value, while noise-free resolution is based on a peak-to-peak noise value specified as 6.6

times the RMS noise value. Effective resolution is calculated as LOG((Input Span)/(RMS

Noise))/LOG(2).

Specifications are subject to change without notice.

DS289F5

7

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