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AD7817BRUZ-REEL7 Fiches technique(PDF) 3 Page - Analog Devices

No de pièce AD7817BRUZ-REEL7
Description  Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7817BRUZ-REEL7 Fiches technique(HTML) 3 Page - Analog Devices

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Data Sheet
AD7817/AD7818
Rev. D | Page 3 of 20
SPECIFICATIONS
VDD = 2.7 V to 5.5 V, GND = 0 V, REFIN = 2.5 V, unless otherwise noted. The AD7817 temperature sensor is specified with an external
2.5 V reference, and the AD7818 temperature sensor is specified with an on-chip reference. For VDD = 2.7 V, TA = 85°C maximum and
temperature sensor measurement error = ±3°C.
Table 1.
Parameter
AVersion1
BVersion1
SVersion1
Unit
Test Conditions/Comments
DYNAMIC PERFORMANCE (AD7817 ONLY)
Sample rate = 100 kSPS, any channel,
f
IN = 20 kHz
Signal-to-(Noise + Distortion) Ratio2
58
58
58
dB min
Total Harmonic Distortion2
–65
−65
−65
dB max
−75 dB typical
Peak Harmonic or Spurious Noise2
–65
−65
−65
dB max
−75 dB typical
Intermodulation Distortion2
fa =19.9 kHz, fb = 20.1 kHz
Second-Order Terms
–67
−67
−67
dB typ
Third-Order Terms
–67
−67
−67
dB typ
Channel-to-Channel Isolation2
–80
−80
−80
dB typ
f
IN = 20 kHz
DC ACCURACY (AD7817 ONLY)
Any channel
Resolution
10
10
10
Bits
Minimum Resolution for Which No
Missing Codes are Guaranteed
10
10
10
Relative Accuracy2
±1
±1
±1
LSB max
Differential Nonlinearity2
±1
±1
±1
LSB max
Gain Error2
±2
±2
±2
LSB max
External reference
±10
±10
+20/−10
LSB max
Internal reference
Gain Error Match2
±1/2
±1/2
±1/2
LSB max
Offset Error2
±2
±2
±2
LSB max
Offset Error Match
±1/2
±1/2
±1/2
LSB max
TEMPERATURE SENSOR (AD7817 ONLY)
Measurement Error
External reference V
REF = 2.5 V
Ambient Temperature 25°C
±2
±1
±2
°C max
T
MIN to TMAX
±3
±2
±3
°C max
Measurement Error
On-chip reference
Ambient Temperature 25°C
±2.25
±2.25
±2.25
°C max
T
MIN to TMAX
±3
±3
±6
°C max
Temperature Resolution
1/4
1/4
1/4
°C/LSB
REFERENCE INPUT (AD7817 ONLY)3, 4
REF
IN Input Voltage Range
3
2.625
2.625
2.625
V max
2.5 V + 5%
2.375
2.375
2.375
V min
2.5 V − 5%
Input Impedance
40
40
40
kΩ min
Input Capacitance
10
10
10
pF max
ON-CHIP REFERENCE (AD7817 ONLY)5
Nominal 2.5 V
Temperature Coefficient3
80
80
150
ppm/°C typ
CONVERSION RATE (AD7817 ONLY)
Track-and-Hold Acquisition Time4
400
400
400
ns max
Source Impedance < 10 Ω
Conversion Time
Temperature Sensor
27
27
27
µs max
Channel 1 to Channel 4
9
9
9
μs max


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