CS5521_09 Datasheet, PDF (8/56 Pages) Cirrus Logic – 16-bit or 24-bit, 2/4/8-channel ADCs with PGIA

CS5521/22/23/24/28
TYPICAL RMS NOISE, CS5522/24/28 (Notes 14 and 15)
Output Rate -3 dB Filter
(Sps)
Frequency
1.88
1.64
3.76
3.27
7.51
6.55
15.0
12.7
30.0
25.4
61.6 (Note 16)
50.4
84.5 (Note 16)
70.7
101.1 (Note 16) 84.6
25 mV
90 nV
110 nV
170 nV
250 nV
500 nV
2 µV
10 µV
30 µV
Input Range, (Bipolar/Unipolar Mode)
55 mV
100 mV
1V
2.5 V
95 nV
140 nV
1.5 µV
3 µV
130 nV
190 nV
2 µV
4 µV
200 nV
275 nV
2.5 µV
6 µV
330 nV
580 nV
4.5 µV
10 µV
1 µV
1.5 µV
16 µV
45 µV
4 µV
8 µV
72 µV
195 µV
20 µV
35 µV
340 µV
900 µV
60 µV
105 µV
1.1 mV
3 mV
5V
6 µV
8 µV
11.5 µV
20 µV
85 µV
350 µV
2 mV
5.3 mV
Notes: 14. Wideband noise aliased into the baseband. Referred to the input. Typical values shown for 25° C.
15. To estimate Peak-to-Peak Noise, multiply RMS noise by 6.6 for all ranges and output rates.
16. For input ranges <100 mV and output rates ≥60 Sps, 16.384 kHz chopping frequency is used.
TYPICAL NOISE FREE RESOLUTION (BITS), CS5522/24/28 (Note 17)
Output Rate -3 dB Filter
Input Range, (Bipolar Mode)
(Sps)
Frequency 25 mV
55 mV
100 mV
1V
2.5 V
5V
1.88
1.64
16
17
18
18
18
18
3.76
3.27
16
17
17
17
18
18
7.51
6.55
15
16
17
17
17
17
15.0
12.7
15
16
16
16
16
16
30.0
25.4
14
14
14
14
14
14
61.6 (Note 16)
50.4
12
12
12
12
12
12
84.5 (Note 16)
70.7
10
10
10
10
10
10
101.1 (Note 16) 84.6
8
8
8
8
8
8
Notes: 17. 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
CS5522/24/28’s output conversions are 24 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.
8
DS317F8