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AD4020 Datasheet(PDF) 4 Page - Analog Devices

Part # AD4020
Description  Precision SAR, Differential ADC
PDF  37 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD4020 Datasheet(HTML) 4 Page - Analog Devices

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Data Sheet
AD4020
Rev. A | Page 3 of 36
SPECIFICATIONS
VDD = 1.71 V to 1.89 V, VIO = 1.71 V to 5.5 V, VREF = 5 V, all specifications TMIN to TMAX, high-Z mode disabled, span compression disabled,
and turbo mode enabled (fS = 1.8 MSPS), unless otherwise noted.
Table 1.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
RESOLUTION
20
Bits
ANALOG INPUT
Voltage Range
VIN+ − VIN−
−VREF
+VREF
V
Span compression enabled
−VREF × 0.8
+VREF × 0.8
V
Operating Input Voltage
VIN+, VIN− to GND
−0.1
+VREF + 0.1
V
Span compression enabled
0.1 × VREF
0.9 × VREF
V
Common-Mode Input Range
VREF/2 − 0.125
VREF/2
VREF/2 + 0.125
V
Common-Mode Rejection Ratio (CMRR)
fIN = 500 kHz
68
dB
Analog Input Current
Acquisition phase, TA = 25°C
0.3
nA
High-Z mode enabled, converting
dc input at 1.8 MSPS
1
µA
THROUGHPUT
Complete Cycle
555
ns
Conversion Time
300
320
350
ns
Acquisition Phase1
325
ns
Throughput Rate2 (fS)
0
1.8
MSPS
Transient Response3
325
ns
DC ACCURACY
No Missing Codes
20
Bits
Integral Nonlinearity Error (INL)
−3.1
±1
+3.1
ppm
T = 0°C to 70°C
−2
±1
+2
ppm
Differential Nonlinearity Error (DNL)
−0.5
±0.3
+0.5
LSB
Transition Noise
3.3
LSB
Zero Error
−35
+35
LSB
Zero Error Drift4
−0.3
+0.3
ppm/°C
Gain Error
−88
±12
+88
LSB
Gain Error Drift4
−1.2
+1.2
ppm/°C
Power Supply Sensitivity
VDD = 1.8 V ± 5%
±6
LSB
1/f Noise5
Bandwidth = 0.1 Hz to 10 Hz
6
µV p-p
AC ACCURACY
Dynamic Range
101
dB
Total RMS Noise
31.5
µV rms
fIN = 1 kHz, −0.5 dBFS, VREF = 5 V
Signal-to-Noise Ratio (SNR)
99
100.5
dB
Spurious-Free Dynamic Range (SFDR)
122
dB
Total Harmonic Distortion (THD)
−123
dB
Signal-to-Noise-and-Distortion Ratio
(SINAD)
98.5
100
dB
Oversampled Dynamic Range
Oversampling ratio (OSR) = 256,
VREF = 5 V
122
dB
fIN = 1 kHz, −0.5 dBFS, VREF = 2.5 V
SNR
93.3
94.7
dB
SFDR
122
dB
THD
−119
dB
SINAD
93
94.5
dB



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