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ADS1231IDR Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza ADS1231IDR
Descripción Electrónicos  24-Bit Analog-to-Digital Converter for Bridge Sensors
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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ADS1231IDR Datasheet(HTML) 3 Page - Texas Instruments

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ADS1231
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SBAS414C – JULY 2009 – REVISED DECEMBER 2010
ELECTRICAL CHARACTERISTICS
Minimum/maximum limit specifications apply from –40°C to +85°C. Typical specifications at +25°C.
All specifications at AVDD = DVDD = VREFP = +5V, VCM = 2.5V and VREFN = GND, unless otherwise noted.
ADS1231
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUTS
±0.5VREF/128
V
Full-scale input voltage (AINP – AINN)
VREF = AVDD = 5V
±19.5
mV
VREF = AVDD = 3V
±11.7
mV
Common-mode input range
GND + 1.5
AVDD – 1.5
V
Differential input current
±2
nA
LOW-SIDE POWER SWITCH
AVDD = 5V, ISW = 30mA
3.5
5
On-resistance (RON)
AVDD = 3V, ISW = 30mA
4
7
Current through switch
30
mA
SYSTEM PERFORMANCE
Resolution
No missing codes
24
Bits
Internal oscillator, SPEED = high
80
SPS
Internal oscillator, SPEED = low
10
SPS
Data rate
External oscillator, SPEED = high
fCLK/61, 440
SPS
External oscillator, SPEED = low
fCLK/491, 520
SPS
Digital filter settling time
Full settling
4
Conversions
Integral nonlinearity (INL)
Differential input, end-point fit
±8
ppm
Input offset error
10
mV
Input offset drift
±20
nV/°C
Gain error
1
%
Gain drift
±2
ppm/°C
fIN = 50Hz or 60Hz ±1Hz, fDATA = 10SPS,
80
100
dB
internal oscillator
Normal-mode rejection(1)
fIN = 50Hz or 60Hz ±1Hz, fDATA = 10SPS,
90
110
dB
external oscillator(2)
Common-mode rejection
At dc
110
dB
fDATA = 10SPS, AVDD = VREF = 5V
35
nV, rms
fDATA = 80SPS, AVDD = VREF = 5V
102
nV, rms
Noise
fDATA = 10SPS, AVDD = VREF = 5V
232
nV, P-P
fDATA = 80SPS, AVDD = VREF = 5V
622
nV, P-P
Power-supply rejection
At dc
90
100
dB
VOLTAGE REFERENCE INPUT
Voltage reference input (VREF)
VREF = VREFP – VREFN
1.5
AVDD
AVDD + 0.1
V
Negative reference input (VREFN)
AGND – 0.1
VREFP – 1.5
V
Positive reference input (VREFP)
VREFN + 1.5
AVDD + 0.1
V
Voltage reference input current
10
nA
DIGITAL INPUT/OUTPUT (DVDD = 3V to 5.3V)
VIH
0.8 DVDD
DVDD + 0.1
V
VIL
GND
0.2 DVDD
V
Logic levels
VOH
IOH = 500mA
DVDD – 0.4
V
VOL
IOL = 500mA
0.2 DVDD
V
Input leakage
0 < VDIGITAL INPUT < DVDD
±10
mA
Serial clock input frequency (fSCLK)
5
MHz
(1)
Specification is assured by the combination of design and final test.
(2)
External oscillator = 4.9152MHz.
Copyright © 2009–2010, Texas Instruments Incorporated
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