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ADS1232IPW Datasheet(PDF) 5 Page - Texas Instruments

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Part # ADS1232IPW
Description  24-Bit Analog-to-Digital Converter For Bridge Sensors
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1232IPW Datasheet(HTML) 5 Page - Texas Instruments

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NOISE PERFORMANCE
ADS1232
ADS1234
SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008
The ADS1232/4 offer outstanding noise performance that can be optimized for a given full-scale range using the
on-chip programmable gain amplifier. Table 1 through Table 4 summarize the typical noise performance with
inputs shorted externally for different gains, 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. AVDD = 5V, VREF = 5V, Data Rate = 10SPS
GAIN
RMS NOISE
PEAK-TO-PEAK NOISE(1)
ENOB (RMS)
NOISE-FREE BITS
1
420nV
1.79µV
23.5
21.4
2
270nV
900nV
23.1
21.4
64
19nV
125nV
22.0
19.2
128
17nV
110nV
21.1
18.4
(1)
Peak-to-peak noise data are based on direct measurement.
Table 2. AVDD = 5V, VREF = 5V, Data Rate = 80SPS
GAIN
RMS NOISE
PEAK-TO-PEAK NOISE(1)
ENOB (RMS)
NOISE-FREE BITS
1
1.36µV
8.3µV
21.8
19.2
2
850nV
5.5µV
21.5
18.8
64
48nV
307nV
20.6
18
128
44nV
247nV
19.7
17.2
(1)
Peak-to-peak noise data are based on direct measurement.
Table 3. AVDD = 3V, VREF = 3V, Data Rate = 10SPS
GAIN
RMS NOISE
PEAK-TO-PEAK NOISE(1)
ENOB (RMS)
NOISE-FREE BITS
1
450nV
2.8µV
22.6
20
2
325nV
1.8µV
22.1
19.7
64
20nV
130nV
21.2
18.5
128
18nV
115nV
20.3
17.6
(1)
Peak-to-peak noise data are based on direct measurement.
Table 4. AVDD = 3V, VREF = 3V, Data Rate = 80SPS
GAIN
RMS NOISE
PEAK-TO-PEAK NOISE(1)
ENOB (RMS)
NOISE-FREE BITS
1
2.2µV
12µV
20.4
17.9
2
1.2µV
6.8µV
20.2
17.8
64
54nV
340nV
19.7
17.1
128
48nV
254nV
18.9
16.5
(1)
Peak-to-peak noise data are based on direct measurement of 1024 samples.
Copyright © 2005–2008, Texas Instruments Incorporated
5
Product Folder Link(s): ADS1232 ADS1234


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