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ADS1281IPWRG4 Datasheet(PDF) 3 Page - Texas Instruments

No. de pieza ADS1281IPWRG4
Descripción Electrónicos  High-Resolution Analog-to-Digital Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
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ADS1281IPWRG4 Datasheet(HTML) 3 Page - Texas Instruments

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ADS1281
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SBAS378D – AUGUST 2007 – REVISED JUNE 2010
ELECTRICAL CHARACTERISTICS
Limit specifications at –40°C to +85°C, typical specifications at +25°C, AVDD = +2.5V, AVSS = –2.5V, fCLK
(1) = 4.096MHz, VREFP = +2.5V,
VREFN = –2.5V, DVDD = +3.3V, and fDATA = 1000SPS, unless otherwise noted.
ADS1281
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUTS
Full-scale input voltage
VIN = AINP – AINN
±VREF/2
V
Absolute input range
AINP or AINN
AVSS – 0.1
AVDD + 0.1
V
Differential input impedance
55
k
AC PERFORMANCE
fDATA = 250SPS
130
fDATA = 500SPS
127
Signal-to-noise ratio(2)
SNR
fDATA = 1000SPS
120
124
dB
fDATA = 2000SPS
121
fDATA = 4000SPS
118
Total harmonic distortion
THD
–122
–115
dB
VIN = 31.25Hz, –0.5dBFS
Spurious-free dynamic
SFDR
123
dB
range(3)
DC PERFORMANCE
Resolution
No missing codes
31
Bits
FIR filter mode
250
4000
SPS
Data rate
fDATA
Sinc filter mode
8,000
128,000
SPS
Integral nonlinearity(4)
INL
Differential input
0.00006
0.0005
% FSR(5)
Offset error
10
200
mV
Offset error after calibration(6)
Shorted input
1
mV
Offset drift
0.06
mV/°C
Gain error
0.1
0.3
%
Gain error after calibration(6)
0.0002
%
Gain drift
0.4
ppm/°C
Common-mode rejection
fCM = 60Hz
105
120
dB
AVDD, AVSS
85
95
Power-supply rejection
fPS = 60Hz
dB
DVDD
85
105
FIR DIGITAL FILTER RESPONSE
Passband ripple
±0.003
dB
Passband (–0.01dB)
0.375 × fDATA
Hz
Stop band attenuation(7)
135
dB
Stop band
0.500 × fDATA
Hz
Bandwidth (–3dB)
0.413 × fDATA
Hz
FIR filter, minimum phase(8)
5/fDATA
Group delay
s
FIR filter, linear phase
31/fDATA
FIR filter, minimum phase
62/fDATA
Settling time (latency)
s
FIR filter, linear phase
62/fDATA
High-pass filter corner
0.1
10
Hz
(1)
fCLK = system clock.
(2)
SNR = signal-to-noise ratio = 20 log (VRMS Full-Scale/VRMS Noise), VIN = 20mVDC.
(3)
Highest spurious component including harmonics.
(4)
Best-fit method.
(5)
FSR: Full-scale range = ±VREF/2.
(6)
Calibration accuracy is on the level of noise reduced by 4 (calibration averages 16 readings).
(7)
Input frequencies in the range of NfCLK/512 ± fDATA/2 (N = 1, 2, 3...) can mix with the modulator chopping clock. In these frequency
ranges intermodulation = 120dB, typ.
(8)
At dc; see Figure 32.
Copyright © 2007–2010, Texas Instruments Incorporated
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