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AD7172-2 数据表(PDF) 5 Page - Analog Devices

部件名 AD7172-2
功能描述  True rail-to-rail analog and reference input buffers
Download  61 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7172-2 数据表(HTML) 5 Page - Analog Devices

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AD7172-2
Data Sheet
Rev. A | Page 4 of 60
SPECIFICATIONS
AVDD1 = 3.0 V to 5.5 V, AVDD2 = IOVDD = 2 V to 5.5 V, AVSS = DGND = 0 V, REF+ = 2.5 V, REF− = AVSS,
MCLK = internal master clock = 2 MHz, TA = TMIN to TMAX (−40°C to +105°C), unless otherwise noted.
Table 1.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
ADC SPEED AND PERFORMANCE
Output Data Rate (ODR)
1.25
31,250
SPS
No Missing Codes1
Excluding sinc3 filter ≥ 15 kSPS
24
Bits
Resolution
See Table 6 and Table 7
Noise
See Table 6 and Table 7
ACCURACY
Integral Nonlinearity (INL)
±2
±5
ppm of FSR
Offset Error2
Internal short
±40
µV
Offset Drift
Internal short
±65
nV/°C
Gain Error2
AVDD1 = 5 V
±5
±45
ppm of FSR
Gain Drift
±0.2
±0.5
ppm/°C
REJECTION
Power Supply Rejection
AVDD1, AVDD2, VIN = 1 V
98
dB
Common-Mode Rejection
VIN = 0.1 V
At DC
95
dB
At 50 Hz, 60 Hz1
20 Hz output data rate (postfilter), 50 Hz ±
1 Hz and 60 Hz ± 1 Hz
120
dB
Normal Mode Rejection1
50 Hz ± 1 Hz and 60 Hz ± 1 Hz
Internal clock, 20 SPS ODR (postfilter)
71
90
dB
External clock, 20 SPS ODR (postfilter)
85
90
dB
ANALOG INPUTS
Differential Input Range
VREF = (REF+) − (REF−)
±VREF
V
Absolute Voltage Limits1
Input Buffers Disabled
AVSS − 0.05
AVDD1 + 0.05
V
Input Buffers Enabled
AVSS
AVDD1
V
Analog Input Current
Input Buffers Disabled
Input Current
±6
µA/V
Input Current Drift
External clock
±75
pA/V/°C
Internal clock (±2.5% clock)
±0.5
nA/V/°C
Input Buffers Enabled
Input Current
±5
nA
Input Current Drift
±0.1
nA/°C
Crosstalk
1 kHz input
−120
dB
INTERNAL REFERENCE
100 nF external capacitor to AVSS
Output Voltage
REFOUT, with respect to AVSS
2.5
V
Initial Accuracy3
REFOUT, TA = 25°C
−0.12
+0.12
% of V
Temperature Coefficient1
0°C to 105°C
±2
±5
ppm/°C
−40°C to +105°C
±3
±10
ppm/°C
Reference Load Current, ILOAD
−10
+10
mA
Power Supply Rejection
AVDD1, AVDD2 (line regulation)
90
dB
Load Regulation
∆VOUT/∆ILOAD
50
ppm/mA
Voltage Noise
eN, 0.1 Hz to 10 Hz, 2.5 V reference
4.5
µV rms
Voltage Noise Density
eN, 1 kHz, 2.5 V reference
215
nV/√Hz
Turn On Settling Time
100 nF REFOUT capacitor
200
µs
Short-Circuit Current, ISC
25
mA


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