User Manual

CS5521/22/23/24/28
DS317F8 7
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
Output Rate
(Sps)
-3 dB Filter
Frequency
Input Range, (Bipolar Mode)
25 mV 55 mV 100 mV 1 V 2.5 V 5 V
1.88 1.64 16 16 16 16 16 16
3.76 3.27 16 16 16 16 16 16
7.51 6.55 15 16 16 16 16 16
15.0 12.7 15 15 15 16 16 16
30.0 25.4 14 14 14 14 14 14
61.6 (Note 12) 50.4 12 12 12 12 12 12
84.5 (Note 12)70.7999999
101.1 (Note 12)84.6888888