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AD7817ARZ-REEL7 Fiches technique(PDF) 4 Page - Analog Devices

No de pièce AD7817ARZ-REEL7
Description  Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
Download  20 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7817ARZ-REEL7 Fiches technique(HTML) 4 Page - Analog Devices

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AD7817/AD7818
Data Sheet
Rev. D | Page 4 of 20
Parameter
AVersion1
BVersion1
SVersion1
Unit
Test Conditions/Comments
POWER REQUIREMENTS (AD7817 ONLY)
V
DD
5.5
5.5
5.5
V max
For specified performance
2.7
2.7
2.7
V min
I
DD
Logic inputs = 0 V or V
DD
Normal Operation
2
2
2
mA max
1.6 mA typical
Using External Reference
1.75
1.75
1.75
mA max
2.5 V external reference connected
Power-Down (V
DD = 5 V)
10
10
12.5
µA max
5.5 µA typical
Power-Down (V
DD = 3 V)
4
4
4.5
µA max
2 µA typical
Auto Power-Down Mode
V
DD = 3 V
10 SPS Throughput Rate
6.4
6.4
6.4
µW typ
See the Power vs. Throughput
section for description of power
dissipation in auto power-down mode
1 kSPS Throughput Rate
48.8
48.8
48.8
µW typ
10 kSPS Throughput Rate
434
434
434
µW typ
Power-Down
12
12
13.5
µW max
Typically 6 µW
DYNAMIC PERFORMANCE (AD7818 ONLY)6
Sample rate = 100 kSPS, any channel,
f
IN = 20 kHz
Signal-to-(Noise + Distortion) Ratio2
57
dB min
Total Harmonic Distortion2
–65
dB max
−75 dB typical
Peak Harmonic or Spurious Noise2
–67
dB typ
−75 dB typical
Intermodulation Distortion2
fa = 19.9 kHz, fb = 20.1 kHz
Second-Order Terms
–67
dB typ
Third-Order Terms
–67
dB typ
Channel-to-Channel Isolation2
–80
dB typ
f
IN = 20 kHz
DC ACCURACY (AD7818 ONLY)6
Any channel
Resolution
10
Bits
Minimum Resolution for Which No
Missing Codes are Guaranteed
10
Bits
Relative Accuracy2
±1
LSB max
Differential Nonlinearity2
±1
LSB max
Gain Error2
±10
LSB max
Offset Error2
±4
LSB max
TEMPERATURE SENSOR (AD7818 ONLY)6
Measurement Error
External reference V
REF = 2.5 V
Ambient Temperature 25°C
±2
°C max
T
MIN to TMAX
±3
°C max
Measurement Error
On-chip reference
Ambient Temperature 25°C
±2
°C max
T
MIN to TMAX
±3
°C max
Temperature Resolution
1/4
°C/LSB
ON-CHIP REFERENCE (AD7818 ONLY)5
Nominal 2.5 V
Temperature Coefficient3
30
ppm/°C typ
CONVERSION RATE (AD7818 ONLY)6
Track-and-Hold Acquisition Time4
400
ns max
Source impedance < 10 Ω
Conversion Time
Temperature Sensor
27
µs max
Channel 1
9
µs max


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