Datasheet

ADS1230
SBAS366B –OCTOBER 2006–REVISED SEPTEMBER 2012 www.ti.com
NOISE PERFORMANCE
The ADS1230 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 for AV
DD
= 5V and V
REF
= 5V
RMS NOISE PEAK-TO-PEAK NOISE
(1)
ENOB
DATA RATE GAIN (nV) (nV) (RMS) NOISE-FREE BITS
64 53 290 20.5 18
10
128 40 198 19.8 17.5
64 100 480 19.5 17.3
80
128 88 480 18.7 16.3
(1) Peak-to-peak data are based on direct measurement.
Table 2. Noise Performance for AV
DD
= 3V and V
REF
= 3V
RMS NOISE PEAK-TO-PEAK NOISE
(1)
ENOB
DATA RATE GAIN (nV) (nV) (RMS) NOISE-FREE BITS
64 46 290 20.6 18
10
128 49 259 19.6 17.2
64 100 576 19.5 17
80
128 102 461 18.5 16.3
(1) Peak-to-peak data are based on direct measurement.
6 Submit Documentation Feedback Copyright © 2006–2012, Texas Instruments Incorporated
Product Folder Links: ADS1230