AD7818ARMZ-REEL7 Просмотр технического описания (PDF) - Analog Devices
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AD7818ARMZ-REEL7 Datasheet PDF : 20 Pages
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Data Sheet
AD7817/AD7818
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
DYNAMIC PERFORMANCE (AD7817 ONLY)
Signal-to-(Noise + Distortion) Ratio2
Total Harmonic Distortion2
Peak Harmonic or Spurious Noise2
Intermodulation Distortion2
Second-Order Terms
Third-Order Terms
Channel-to-Channel Isolation2
DC ACCURACY (AD7817 ONLY)
Resolution
Minimum Resolution for Which No
Missing Codes are Guaranteed
Relative Accuracy2
Differential Nonlinearity2
Gain Error2
Gain Error Match2
Offset Error2
Offset Error Match
TEMPERATURE SENSOR (AD7817 ONLY)
Measurement Error
Ambient Temperature 25°C
TMIN to TMAX
Measurement Error
Ambient Temperature 25°C
TMIN to TMAX
Temperature Resolution
REFERENCE INPUT (AD7817 ONLY)3, 4
REFIN Input Voltage Range3
Input Impedance
Input Capacitance
ON-CHIP REFERENCE (AD7817 ONLY)5
Temperature Coefficient3
CONVERSION RATE (AD7817 ONLY)
Track-and-Hold Acquisition Time4
Conversion Time
Temperature Sensor
Channel 1 to Channel 4
A Version1 B Version1
58
58
–65
−65
–65
−65
–67
−67
–67
−67
–80
−80
10
10
10
10
±1
±1
±1
±1
±2
±2
±10
±10
±1/2
±1/2
±2
±2
±1/2
±1/2
±2
±3
±2.25
±3
1/4
2.625
2.375
40
10
80
400
27
9
±1
±2
±2.25
±3
1/4
2.625
2.375
40
10
80
400
27
9
S Version1
58
−65
−65
−67
−67
−80
10
10
±1
±1
±2
+20/−10
±1/2
±2
±1/2
±2
±3
±2.25
±6
1/4
2.625
2.375
40
10
150
400
27
9
Unit
dB min
dB max
dB max
dB typ
dB typ
dB typ
Bits
Test Conditions/Comments
Sample rate = 100 kSPS, any channel,
fIN = 20 kHz
−75 dB typical
−75 dB typical
fa =19.9 kHz, fb = 20.1 kHz
fIN = 20 kHz
Any channel
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
External reference
Internal reference
°C max
°C max
°C max
°C max
°C/LSB
External reference VREF = 2.5 V
On-chip reference
V max
V min
kΩ min
pF max
ppm/°C typ
2.5 V + 5%
2.5 V − 5%
Nominal 2.5 V
ns max
Source Impedance < 10 Ω
µs max
μs max
Rev. D | Page 3 of 20
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