AD7691 Analog Devices, AD7691 Datasheet - Page 3

• Manufacturer Part Number: AD7691
• Manufacturer: Analog Devices

Specifications of AD7691

• Resolution (bits): 18bit
• # Chan: 1
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

SPECIFICATIONS
VDD = 2.3 V to 5.25 V, VIO = 2.3 V to VDD, V
Table 2.
Parameter
RESOLUTION
ANALOG INPUT
THROUGHPUT
ACCURACY
AC ACCURACY
1
2
3
4
5
6
See the Analog Inputs section.
LSB means least significant bit. With the ±5 V input range, one LSB is 38.15 μV.
See the Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.
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.
Dynamic range obtained by oversampling the ADC running at a throughput f
f
IN1
Voltage Range, V
Absolute Input Voltage
Common-Mode Input Range
Analog Input CMRR
Leakage Current at 25°C
Input Impedance
Conversion Rate
Transient Response
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Transition Noise
Gain Error
Gain Error Temperature Drift
Zero Error
Zero Temperature Drift
Power Supply Sensitivity
Dynamic Range
Oversampled Dynamic Range
Signal-to-Noise
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise + Distortion)
Intermodulation Distortion
= 21.4 kHz and f
3
3
4
IN2
= 18.9 kHz, with each tone at −7 dB below full scale.
IN
1
6
5
REF
Conditions/Comments
IN+ − (IN−)
IN+, IN−
IN+, IN−
f
Acquisition phase
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
Full-scale step
REF = VDD = 5 V
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
VDD = 5 V ± 5%
V
f
f
f
f
f
f
f
IN
IN
IN
IN
IN
IN
IN
IN
REF
= VDD, all specifications T
= 250 kHz
= 1 kSPS
= 1 kHz, V
= 1 kHz, V
= 1 kHz, V
= 1 kHz, V
= 1 kHz, V
= 1 kHz, V
= 5 V
REF
REF
REF
REF
REF
REF
Rev. B | Page 3 of 28
= 5 V
= 2.5 V
= 5 V
= 5 V
= 5 V
= 2.5 V
S
of 250 kSPS, followed by postdigital filtering with an output word rate f
MIN
to T
Min
18
−V
−0.1
V
0
0
18
−1.5
−1
−40
−80
−0.8
−3.5
101
100
95
100
95
MAX
REF
REF
, unless otherwise noted.
/2 − 0.1
Typ
V
65
1
±0.75
±0.5
0.75
±2
±2
±0.3
±0.1
±0.7
±0.3
±0.25
102
125
101.5
96.5
−125
−118
101.5
96.5
115
REF
/2
Max
+V
V
V
250
180
+1.5
+1.25
+40
+80
+0.8
+3.5
1.8
REF
REF
REF
/2 + 0.1
+ 0.1
O
.
AD7691
Bits
Unit
V
V
V
dB
nA
kSPS
kSPS
μs
Bits
LSB
LSB
LSB
LSB
LSB
ppm/°C
mV
mV
ppm/°C
LSB
dB
dB
dB
dB
dB
dB
dB
dB
dB
2
2
2
2
2
2