CS5521 datasheet(7/56 Pages) CIRRUS

7 / 56 page

CS5521/22/23/24/28

DS317F8

TYPICAL RMS NOISE, CS5521/23 (Notes 10 and 11)

Notes: 10. Wideband noise aliased into the baseband. Referred to the input. Typical values shown for 25° C.

11. To estimate Peak-to-Peak Noise, multiply RMS noise by 6.6 for all ranges and output rates.

12. For input ranges <100 mV and output rates

≥60 Sps, 16.384 kHz chopping frequency is used.

TYPICAL NOISE FREE RESOLUTION (BITS), CS5521/23 (Note 13)

Notes: 13. For bipolar mode, the number of bits of Noise Free Resolution is LOG((2XInput Range)/(6.6xRMS

Noise))/LOG(2) rounded to the nearest bit. For unipolar mode, the number of bits of Noise Free

Resolution is LOG((Input Range)/(6.6xRMS Noise))/LOG(2) rounded to the nearest bit. Also, the

CS5521/23’s output conversions are 16 bits. Noise free Resolution numbers are based upon

VREF = 2.5 V and XIN = 32.768 kHz. The values will be affected directly by changes in VREF, but the

effects due to changes in the XIN frequency will be minor.

Output Rate

(Sps)

-3 dB Filter

Frequency

Input Range, (Bipolar/Unipolar Mode)

25 mV

55 mV

100 mV

1 V

2.5 V

5 V

1.88

1.64

90 nV

148 nV

220 nV

1.8 µV

3.9 µV

7.8 µV

3.76

3.27

122 nV

182 nV

310 nV

2.6 µV

5.7 µV

11.3 µV

7.51

6.55

180 nV

267 nV

435 nV

3.7 µV

8.5 µV

18.1 µV

15.0

12.7

280 nV

440 nV

810 nV

5.7 µV

14 µV

28 µV

30.0

25.4

580 nV

1.1 µV

2.1 µV

18.2 µV

48 µV

96 µV

61.6 (Note 12)

50.4

2.6 µV

4.9 µV

8.5 µV

92 µV

238 µV

390 µV

84.5 (Note 12)

70.7

11 µV

27 µV

43 µV

458 µV

1.1 mV

2.4 mV

101.1 (Note 12)

84.6

41 µV

72 µV

130 µV

1.2 mV

3.4 mV

6.7 mV