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ADS1218 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory
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Trang chủ  http://www.ti.com
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ADS1218 bảng dữ liệu(HTML) 3 Page - Texas Instruments

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ELECTRICAL CHARACTERISTICS: AV
DD = 5V
ADS1218
SBAS187C – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
All specifications T
MIN to TMAX, AVDD = +5V, DVDD = +2.7V to 5.25V, fMOD = 19.2kHz, fOSC = 2.4576MHz, PGA = 1, Buffer On,
R
DAC = 150kΩ, VREF ≡ (REF IN+) – (REF IN–) = +2.5V, and fDATA = 10Hz, unless otherwise specified.
ADS1218
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
ANALOG INPUT (AIN0 – AIN7, AINCOM)
Analog Input Range
Buffer Off
AGND – 0.1
AVDD + 0.1
V
Buffer On
AGND + 0.05
AVDD – 1.5
V
Full-Scale Input Voltage Range
(In+) – (In–), See Block Diagram
±VREF/PGA
V
Differential Input Impedance
Buffer Off
5/PGA
M
Input Current
Buffer On
0.5
nA
Bandwidth
Fast Settling Filter
–3dB
0.469 × fDATA
Hz
–3dB
0.318 × fDATA
Hz
Sinc2 Filter
–3dB
0.262 × fDATA
Hz
Sinc3 Filter
Programmable Gain Amplifier
User-Selectable Gain Ranges
1
128
Input Capacitance
9
pF
Input Leakage Current
Modulator Off, T = +25°C
5
pA
Burnout Current Sources
2
µA
OFFSET DAC
Offset DAC Range
±VREF/(2 × PGA)
V
Offset DAC Monotonicity
8
Bits
Offset DAC Gain Error
±10
%
Offset DAC Gain Error Drift
1
ppm/°C
SYSTEM PERFORMANCE
Resolution
24
Bits
No Missing Codes
24
Bits
sinc3
Integral Nonlinearity
End Point Fit
±0.0015
% of FS
Offset Error(1)
Before Calibration
7.5
ppm of FS
Offset Drift(1)
0.02
ppm of FS/°C
Gain Error
After Calibration
0.005
%
Gain Error Drift(1)
0.5
ppm/°C
Common-Mode Rejection
at DC
100
dB
fCM = 60Hz, fDATA = 10Hz
130
dB
fCM = 50Hz, fDATA = 50Hz
120
dB
fCM = 60Hz, fDATA = 60Hz
120
dB
Normal-Mode Rejection
fSIG = 50Hz, fDATA = 50Hz
100
dB
fSIG = 60Hz, fDATA = 60Hz
100
dB
Output Noise
See Typical Characteristics
Power-Supply Rejection
at DC, dB = –20 log(
∆VOUT/∆VDD)(2)
80
95
dB
VOLTAGE REFERENCE INPUT
Reference Input Range
REF IN+, REF IN–
0
AVDD
V
VREF
VREF ≡ (REF IN+) – (REF IN–)
0.1
2.5
2.6
V
Common-Mode Rejection
at DC
120
dB
Common-Mode Rejection
fVREFCM = 60Hz, fDATA = 60Hz
120
dB
Bias Current(3)
VREF = 2.5V
1.3
µA
(1)
Calibration can minimize these errors.
(2)
∆VOUT is change in digital result.
(3)
12pF switched capacitor at fSAMP clock frequency.
3


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