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AD7982 Datasheet(PDF) 4 Page - Analog Devices

Part No. AD7982
Description  18-Bit, 1 MSPS PulSAR 7 mW ADC in MSOP/LFCSP
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7982 Datasheet(HTML) 4 Page - Analog Devices

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Data Sheet
AD7982
Rev. D | Page 3 of 25
SPECIFICATIONS
VDD = 2.5 V, VIO = 1.71 V to 5.5 V, VREF = 5 V, TA = −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
RESOLUTION
18
Bits
ANALOG INPUT
Voltage Range
IN+ − IN−
−VREF
+VREF
V
Absolute Input Voltage
IN+ and IN−
−0.1
VREF + 0.1
V
Common-Mode Input Range
IN+ and IN−
VREF × 0.475
VREF × 0.5
VREF × 0.525
V
Analog Input Common Mode Rejection
Ratio (CMRR)
fIN = 450 kHz
67
dB
Leakage Current at 25°C
Acquisition phase
200
nA
Input Impedance
See the Analog Inputs section
ACCURACY
No Missing Codes
18
Bits
Differential Linearity Error (DNL)
−0.85
±0.5
+1.5
LSB1
Integral Linearity Error (INL)
−2
±1
+2
LSB1
Transition Noise
VREF = 5 V
1.05
LSB1
Gain Error, TMIN to TMAX2
−0.023
+0.004
+0.023
% of FS
Gain Error Temperature Drift
±1
ppm/°C
Zero Error, TMIN to TMAX2
±100
+700
μV
Zero Temperature Drift
0.5
ppm/°C
Power Supply Rejection Ratio (PSRR)
VDD = 2.5 V ± 5%
90
dB
THROUGHPUT
Conversion Rate
VIO ≥ 2.3 V
0
1
MSPS
VIO ≥ 1.71 V
0
800
kSPS
Transient Response
Full-scale step
290
ns
AC ACCURACY
Dynamic Range
VREF = 5 V
97
99
dB3
VREF = 2.5 V
93
dB3
Oversampled Dynamic Range4
FO = 1 kSPS
129
dB3
Signal-to-Noise Ratio (SNR)
fIN = 1 kHz, VREF = 5 V
95.5
98
dB3
fIN = 1 kHz, VREF = 2.5 V
92.5
dB3
Spurious-Free Dynamic Range (SFDR)
fIN = 10 kHz
−115
dB3
Total Harmonic Distortion5 (THD)
fIN = 10 kHz
−120
dB3
Signal-to-Noise-and-Distortion (SINAD)
fIN = 1 kHz, VREF = 5 V
97
dB3
1 LSB means least significant bit. With the ±5 V input range, 1 LSB is 38.15 μV.
2 See Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.
3 All specifications expressed in decibels are referred to a full-scale input range (FSR )and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
4 Dynamic range is obtained by oversampling the ADC running at a throughput FS of 1 MSPS followed by postdigital filtering with an output word rate of FO.
5 Tested fully in production at fIN = 1 kHz.


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