CS5521/22/23/24/28
TYPICAL RMS NOISE, CS5521/23
(Notes 10 and 11)
Output Rate -3 dB Filter
(Hz)
Frequency
1.88
1.64
3.76
3.27
7.51
6.55
15.0
12.7
30.0
25.4
61.6 (Note 12)
50.4
84.5 (Note 12)
70.7
101.1 (Note 12)
84.6
25 mV
90 nV
122 nV
180 nV
280 nV
580 nV
2.6 µV
11 µV
41 µV
Input Range, (Bipolar/Unipolar Mode)
55 mV
100 mV
1V
2.5 V
148 nV
220 nV
1.8 µV
3.9 µV
182 nV
310 nV
2.6 µV
5.7 µV
267 nV
435 nV
3.7 µV
8.5 µV
440 nV
810 nV
5.7 µV
14 µV
1.1 µV
2.1 µV
18.2 µV
48 µV
4.9 µV
8.5 µV
92 µV
238 µV
27 µV
43 µV
458 µV
1.1 mV
72 µV
130 µV
1.2 mV
3.4 mV
5V
7.8 µV
11.3 µV
18.1 µV
28 µV
96 µV
390 µV
2.4 mV
6.7 mV
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
Hz, 16.384 kHz chopping frequency is used.
TYPICAL NOISE FREE RESOLUTION (BITS), CS5521/23
(Note 13)
Output Rate -3 dB Filter
(Hz)
Frequency
1.88
1.64
3.76
3.27
7.51
6.55
15.0
12.7
30.0
25.4
61.6 (Note 12)
50.4
84.5 (Note 12)
70.7
101.1 (Note 12)
84.6
25 mV
16
16
15
15
14
12
9
8
55 mV
16
16
16
15
14
12
9
8
Input Range, (Bipolar Mode)
100 mV
1V
16
16
16
16
16
16
15
16
14
14
12
12
9
9
8
8
2.5 V
16
16
16
16
14
12
9
8
5V
16
16
16
16
14
12
9
8
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.
DS317F2
7
CIRRUS [ CIRRUS LOGIC ]
