參數(shù)資料
型號： AD7691
廠商： Analog Devices, Inc.
英文描述： 18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN
中文描述： 18位，1.5 LSB INL和250 kSPS的PulSAR系列差分ADC，采用MSOP / QFN封裝
文件頁數(shù)： 3/28頁
文件大小： 682K
代理商： AD7691
AD7691
SPECIFICATIONS
VDD = 2.3 V to 5.25 V, VIO = 2.3 V to VDD, V
REF
= VDD, all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter
Conditions/Comments
RESOLUTION
ANALOG INPUT
Voltage Range, V
IN
IN+ (IN)
Absolute Input Voltage
IN+, IN
Common-Mode Input Range
IN+, IN
Analog Input CMRR
f
IN
= 250 kHz
Leakage Current at 25°C
Acquisition phase
Input Impedance
1
THROUGHPUT
Conversion Rate
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
Transient Response
Full-scale step
ACCURACY
No Missing Codes
Integral Linearity Error
Differential Linearity Error
Transition Noise
REF = VDD = 5 V
Gain Error
3
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
Gain Error Temperature Drift
Zero Error
3
VDD = 4.5 V to 5.25 V
VDD = 2.3 V to 4.5 V
Zero Temperature Drift
Power Supply Sensitivity
VDD = 5 V
±
5%
AC ACCURACY
Dynamic Range
V
REF
= 5 V
Oversampled Dynamic Range
5
f
IN
= 1 kSPS
Signal-to-Noise
f
IN
= 1 kHz, V
REF
= 5 V
f
IN
= 1 kHz, V
REF
= 2.5 V
Spurious-Free Dynamic Range
f
IN
= 1 kHz, V
REF
= 5 V
Total Harmonic Distortion
f
IN
= 1 kHz, V
REF
= 5 V
Signal-to-(Noise + Distortion)
f
IN
= 1 kHz, V
REF
= 5 V
f
IN
= 1 kHz, V
REF
= 2.5 V
Intermodulation Distortion
6
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 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 f
S
of 250 kSPS, followed by postdigital filtering with an output word rate f
O
.
6
f
IN1
= 21.4 kHz and f
IN2
= 18.9 kHz, with each tone at 7 dB below full scale.
Rev. 0 | Page 3 of 28
Min
18
V
REF
0.1
0
0
0
18
1.5
1
45
80
0.8
3.5
101
100
95
100
95
Typ
V
REF
/2
65
1
±0.75
±0.5
0.75
±2
±2
±0.5
±0.1
±0.7
±1
±0.25
102
125
101.5
96.5
125
118
101.5
96.5
115
Max
+V
REF
V
REF
+ 0.1
V
REF
/2 + 0.1
250
180
1.8
+1.5
+1.25
+45
+80
+0.8
+3.5
Unit
Bits
V
V
V
dB
nA
kSPS
kSPS
μs
Bits
LSB
LSB
2
LSB
LSB
LSB
ppm/°C
mV
mV
ppm/°C
LSB
dB
4
dB
dB
dB
dB
dB
dB
dB
dB
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