ADS1230
www.ti.com
SBAS366–OCTOBER 2006
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) = VREF/Gain.
Table 1. Noise Performance for AVDD = 5V and VREF = 5V
RMS NOISE
(nV)
PEAK-TO-PEAK NOISE(1)
(nV)
ENOB
(RMS)
DATA RATE
10
GAIN
64
NOISE-FREE BITS
53
40
290
198
480
480
20.5
19.8
19.5
18.7
18
128
64
17.5
17.3
16.3
100
88
80
128
(1) Peak-to-peak data are based on direct measurement.
Table 2. Noise Performance for AVDD = 3V and VREF = 3V
RMS NOISE
(nV)
PEAK-TO-PEAK NOISE(1)
(nV)
ENOB
(RMS)
DATA RATE
10
GAIN
64
NOISE-FREE BITS
46
49
290
259
576
461
20.6
19.6
19.5
18.5
18
17.2
17
128
64
100
102
80
128
16.3
(1) Peak-to-peak data are based on direct measurement.
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