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Data Sheet
AD7691
Rev. E | Page 3 of 28
SPECIFICATIONS
VDD = 2.3 V to 5.25 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
Conditions/Comments
Min
Typ
Max
Unit
RESOLUTION
18
Bits
ANALOG INPUT
Voltage Range, VIN
IN+ − (IN−)
−VREF
+VREF
V
Absolute Input Voltage
IN+, IN−
−0.1
VREF + 0.1
V
Common-Mode Input Range
IN+, IN−
VREF/2 − 0.1
VREF/2
VREF/2 + 0.1
V
Analog Input CMRR
fIN = 250 kHz
65
dB
Leakage Current at 25°C
Acquisition phase
1
nA
Input Impedance1
THROUGHPUT
Conversion Rate
VDD = 4.5 V to 5.25 V
0
250
kSPS
VDD = 2.3 V to 4.5 V
0
180
kSPS
Transient Response
Full-scale step
1.8
μs
ACCURACY
No Missing Codes
18
Bits
Integral Linearity Error
−1.5
±0.75
+1.5
LSB2
Differential Linearity Error
−1
±0.5
+1.25
LSB2
Transition Noise
REF = VDD = 5 V
0.75
LSB2
Gain Error3
VDD = 4.5 V to 5.25 V
−40
±2
+40
LSB2
VDD = 2.3 V to 4.5 V
−80
±2
+80
LSB2
Gain Error Temperature Drift
±0.3
ppm/°C
Zero Error3
VDD = 4.5 V to 5.25 V
−0.8
±0.1
+0.8
mV
VDD = 2.3 V to 4.5 V
−3.5
±0.7
+3.5
mV
Zero Temperature Drift
±0.3
ppm/°C
Power Supply Sensitivity
VDD = 5 V ± 5%
±0.25
LSB2
AC ACCURACY4
Dynamic Range
VREF = 5 V
101
102
dB
Oversampled Dynamic Range5
fIN = 1 kSPS
125
dB
Signal-to-Noise
fIN = 1 kHz, VREF = 5 V
100
101.5
dB
fIN = 1 kHz, VREF = 2.5 V
95
96.5
dB
Spurious-Free Dynamic Range
fIN = 1 kHz, VREF = 5 V
−125
dB
Total Harmonic Distortion
fIN = 1 kHz, VREF = 5 V
−118
dB
Signal-to-(Noise + Distortion)
fIN = 1 kHz, VREF = 5 V
100
101.5
dB
fIN = 1 kHz, VREF = 2.5 V
95
96.5
dB
Intermodulation Distortion6
115
dB
1
See the Analog Inputs section.
2
LSB means least significant bit. With the ±5 V input range, one LSB is 38.15 µV.
3
See the Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.
4
All ac accuracy specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
5
Dynamic range obtained by oversampling the ADC running at a throughput fS of 250 kSPS, followed by postdigital filtering with an output word rate fO.
6
fIN1 = 21.4 kHz and fIN2 = 18.9 kHz, with each tone at −7 dB below full scale.


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