AD7942
Rev. B | 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
ACCURACY
No Missing Codes
14
Bits
Differential Linearity Error
0.7
±0.3
+0.7
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
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