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AD7942 Datasheet(PDF) 3 Page - Analog Devices

Part # AD7942
Description  14-Bit, 250 kSPS PulSAR, Pseudo Differential ADC in MSOP/LFCSP
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7942 Datasheet(HTML) 3 Page - Analog Devices

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Data Sheet
AD7942
Rev. C | Page 3 of 24
SPECIFICATIONS
VDD = 2.3 V to 5.5 V, VIO = 2.3 V to VDD, VREF = VDD, TA = –40°C to +85°C, unless otherwise noted.
Table 2.
Parameter
Conditions
Min
Typ
Max
Unit
RESOLUTION
14
Bits
ANALOG INPUT
Voltage Range
IN+ − IN−
0
VREF
V
Absolute Input Voltage
IN+
−0.1
VDD + 0.1
V
IN−
−0.1
+0.1
V
Analog Input CMRR
fIN = 250 kHz
65
dB
Leakage Current
TA = 25°C, acquisition phase
1
nA
Input Impedance
See the Analog Input section
ACCURACY
No Missing Codes
14
Bits
Differential Linearity Error
−0.7
±0.3
+0.7
LSB1
Integral Linearity Error
−1
±0.4
+1
LSB
Transition Noise
VREF = VDD = 5 V
0.33
LSB
Gain Error2, TMIN to TMAX
±0.7
±6
LSB
Gain Error Temperature Drift
±1
ppm/°C
Offset Error2, TMIN to TMAX
VDD = 4.5 V to 5.5 V
±0.45
±3
mV
VDD = 2.3 V to 4.5 V
±0.75
±4.5
mV
Offset Temperature Drift
±2.5
ppm/°C
Power Supply Sensitivity
VDD = 5 V ± 5%
±0.1
LSB
THROUGHPUT
Conversion Rate
VDD = 4.5 V to 5.5 V
0
250
kSPS
VDD = 2.3 V to 4.5 V
0
200
kSPS
Transient Response
Full-scale step
1.8
μs
AC ACCURACY
Signal-to-Noise Ratio (SNR)
fIN = 20 kHz, VREF = 5 V
84.5
85
dB3
fIN = 20 kHz, VREF = 2.5 V
84
dB
Spurious-Free Dynamic Range (SFDR)
fIN = 20 kHz
−100
dB
Total Harmonic Distortion (THD)
fIN = 20 kHz
−100
dB
Signal-to-Noise and Distortion Ratio (SINAD)
fIN = 20 kHz, VREF = 5 V
83
85
dB
fIN = 20 kHz, VREF = 5 V, −60 dB input
25
dB
fIN = 20 kHz, VREF = 2.5 V
84
dB
REFERENCE
Voltage Range
0.5
VDD + 0.3
V
Load Current
250 kSPS, VREF = 5 V
50
μA
SAMPLING DYNAMICS
−3 dB Input Bandwidth
2
MHz
Aperture Delay
VDD = 5 V
2.5
ns
DIGITAL INPUTS
Logic Levels
VIL
–0.3
+0.3 × VIO
V
VIH
0.7 × VIO
VIO + 0.3
V
IIL
−1
+1
μA
IIH
−1
+1
μA


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