Datasheet

ADS1231
SBAS414D –JULY 2009–REVISED OCTOBER 2013 www.ti.com
NOISE PERFORMANCE
The ADS1231 offers outstanding noise performance. Table 1 summarizes the typical noise performance with
inputs shorted externally for different data rates and voltage reference values.
The RMS and Peak-to-Peak noise are referred to the input. The effective number of bits (ENOB) is defined as:
ENOB = ln (FSR/RMS noise)/ln(2)
The Noise-Free Bits are defined as:
Noise-Free Bits = ln (FSR/Peak-to-Peak Noise)/ln(2)
Where:
FSR (Full-Scale Range) = V
REF
/Gain.
Table 1. Noise Performance
AVDD and V
REF
RMS NOISE
(1)
PEAK-TO-PEAK NOISE
(1)
ENOB
DATA RATE (V) (nV) (nV) (RMS) NOISE-FREE BITS
5 35.2 231.9 20.1 17.4
10
3 33.5 199.2 19.4 16.8
5 102.1 622.1 18.5 15.9
80
3 80.3 549.6 18.2 15.4
(1) Noise specifications are based on direct measurement of 1024 consecutive samples.
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