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ADS1258IRTCR Arkusz danych(PDF) 3 Page - Texas Instruments

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Numer części ADS1258IRTCR
Szczegółowy opis  16-Channel, 24-Bit Analog-to-Digital Converter
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

ADS1258IRTCR Arkusz danych(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS
ADS1258
SBAS297A – JUNE 2005 – REVISED SEPTEMBER 2005
All specifications at T
A = –40°C to +105°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, fCLK = 16MHz (external clock),
OPA227 buffer between MUX outputs and ADC inputs, V
REF = +4.096V, and VREFN = –2.5V, unless otherwise noted.
ADS1258
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Analog Multiplexer Inputs
AIN0–AIN15,
Absolute Input Voltage
AVSS – 100mV
AVDD + 100mV
V
AINCOM with respect to DGND
On-Channel Resistance
80
Crosstalk
fIN = 1kHz
–110
dB
SBCS[1:0] = 01
1.5
Sensor Bias (Current Source)
µA
SBCS[1:0] = 11
24
1.5
µA:24µA Ratio Error
1
%
ADC Input
Full-Scale Input Voltage
(VIN = ADCINP – ADCINN)
±1.06V
REF
V
Absolute Input Voltage
(ADCINP, ADCINN)
AVSS – 100mV
AVDD + 100mV
V
Differential Input Impedance
65
k
System Performance
Resolution
No Missing Codes
24
Bits
Data Rate, Fixed-Channel Mode
1.953
125
kSPS
Data Rate, Auto-Scan Mode
1.805
23.739
kSPS
Integral Nonlinearity (INL)(1)
Differential Input
0.0003
0.0010
% of FSR(2)
Chopping Off
20
Offset Error
Shorted Inputs
µV
Chopping On
1
10
Chopping Off
0.5
Offset Drift(3)
Shorted Inputs
µV/°C
Chopping On
0.02
0.1
Gain Error
0.1
0.5
%
Gain Drift(3)
0.4
2
ppm/
°C
Noise
(see Table 4)
Common-Mode Rejection
fCM = 60Hz
90
100
dB
AVDD, AVSS
70
85
Power-Supply Rejection
fPS = 60Hz
dB
DVDD
80
95
Voltage Reference Input
Reference Input Voltage
(VREF = VREFP – VREFN)
0.5
4.096
AVDD – AVSS
V
Negative Reference Input (VREFN)
AVSS – 0.1V
VREFP – 0.5
V
Positive Reference Input (VREFP)
VREFN + 0.5
AVDD + 0.1V
V
Reference Input Impedance
40
k
System Parameters
External Reference Reading Error
1
3
%
Analog Supply Reading Error
1
3
%
Temperature Sensor
Voltage
TA = +25°C
168
mV
Reading
Coefficient
394
µV/°C
Digital Input/Output
Logic Levels:
VIH
0.7DVDD
DVDD
V
VIL
DGND
0.3DVDD
V
VOH
IOH = 2mA
0.8DVDD
DVDD
V
VOL
IOL = 2mA
DGND
0.2DVDD
V
Input Leakage
VIN = DVDD, GND
10
µA
Frequency
0.1
16
MHz
Master Clock Input (CLKIO)
Duty Cycle
40
60
%
(1)
Best straight line fit method.
(2)
FSR = Full-scale range = 2.13VREF.
(3)
Ensured by characterization.
3


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