AD7679
Rev. A | Page 3 of 28
SPECIFICATIONS
–40°C to +85°C, VREF = 4.096 V, AVDD = DVDD= 5 V, OVDD = 2.7 V to 5.25 V, unless otherwise noted.
Table 2.
Parameter
Conditions
Min
Typ
Max
Unit
RESOLUTION
18
Bits
ANALOG INPUT
Voltage Range
VIN+ – VIN–
–VREF
+VREF
V
Operating Input Voltage
VIN+, VIN– to AGND
–0.1
AVDD+0.1
V
Analog Input CMRR
fIN = 100 kHz
68
dB
Input Current
570 kSPS Throughput
25
μA
THROUGHPUT SPEED
Complete Cycle
1.75
μs
Throughput Rate
0
570
kSPS
DC ACCURACY
Integral Linearity Error
–2.5
+2.5
Differential Linearity Error
–1
+1.75
LSB
No Missing Codes
18
Bits
Transition Noise
VREF = 5 V
0.7
LSB
Zero Error, TMIN to TMAX
–40
+40
LSB
Zero Error Temperature Drift
±0.5
ppm/°C
Gain Error, TMIN to TMAX3 –0.048
See Note 3
+0.048
% of FSR
Gain Error Temperature Drift
±1.6
ppm/°C
Power Supply Sensitivity
AVDD = 5 V ± 5%
±4
LSB
AC ACCURACY
Signal-to-Noise
fIN = 2 kHz, VREF = 5 V
101
VREF = 4.096 V
97.5
99
dB
fIN = 10 kHz, VREF = 4.096 V
98
dB
fIN = 100 kHz, VREF = 4.096 V
97
dB
Dynamic Range
VIN+ = VIN– = VREF/2 = 2.5 V
103
dB
Spurious-Free Dynamic Range
fIN = 2 kHz
120
dB
fIN = 10 kHz
118
dB
fIN = 100 kHz
105
dB
Total Harmonic Distortion
fIN = 2 kHz
–115
dB
fIN = 10 kHz
–113
dB
fIN = 100 kHz
–98
dB
Signal-to-(Noise + Distortion)
fIN = 2 kHz, VREF = 4.096 V
98
dB
fIN = 2 kHz, –60 dB Input
40
dB
–3 dB Input Bandwidth
26
MHz
SAMPLING DYNAMICS
Aperture Delay
2
ns
Aperture Jitter
5
ps rms
Transient Response
Full-Scale Step
250
ns
Overvoltage Recovery
250
ns
REFERENCE
External Reference Voltage Range
REF
3
4.096
AVDD + 0.1
V
REF Voltage with Reference Buffer
REFBUFIN = 2.5 V
4.05
4.096
4.15
V
Reference Buffer Input Voltage Range
REFBUFIN
1.8
2.5
2.6
V
REFBUFIN Input Current
–1
+1
μA
REF Current Drain
570 kSPS Throughput
235
μA