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AD7946 データシート(PDF) 3 Page - Analog Devices

部品番号 AD7946
部品情報  14-Bit, 500 kSPS, PulSAR ADC in MSOP and LFCSP
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

AD7946 データシート(HTML) 3 Page - Analog Devices

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Data Sheet
AD7946
SPECIFICATIONS
VDD = 4.5 V to 5.5 V, VIO = 2.3 V to VDD, REF = VDD, TA = −40°C to +85°C, unless otherwise noted.
Table 2.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
RESOLUTION
14
Bits
ANALOG INPUT
Voltage Range
IN+ − IN−
0
REF
V
Absolute Input Voltage
IN+
−0.1
VDD + 0.1
V
IN−
−0.1
0.1
V
Analog Input CMRR
fIN = 200 kHz
65
dB
Leakage Current at 25°C
Acquisition phase
1
nA
Input Impedance
See the Analog Input section
ACCURACY
No Missing Codes
14
Bits
Differential Linearity Error
−0.7
±0.3
+0.7
LSB1
Integral Linearity Error
−1
±0.4
+1
LSB
Transition Noise
REF = VDD = 5 V
0.33
LSB
Gain Error2, TMIN to TMAX
±0.3
±6
LSB
Gain Error Temperature Drift
±1
ppm/°C
Offset Error2, TMIN to TMAX
±0.3
±6
LSB
Offset Temperature Drift
±1
ppm/°C
Power Supply Sensitivity
VDD = 5 V ± 5%
±0.1
LSB
THROUGHPUT
Conversion Rate
0
500
kSPS
Transient Response
Full-scale step
400
ns
AC ACCURACY
Signal-to-Noise
fIN = 20 kHz, REF = 5 V
84.5
85
dB3
fIN = 20 kHz, REF = 2.5 V
84
dB
Spurious-Free Dynamic Range
fIN = 20 kHz
−100
dB
Total Harmonic Distortion
fIN = 20 kHz
−100
dB
Signal-to-(Noise + Distortion)
fIN = 20 kHz, REF = 5 V
84.5
85
dB
fIN = 20 kHz, REF = 5 V, −60 dB input
25
dB
Intermodulation Distortion4
100
dB
1
LSB means least significant bit. With the 5 V input range, one LSB is 305.2 µV.
2
See the Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference.
3
All specifications in dB are referred to a full-scale input, FS. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
4
fIN1 = 21.4 kHz, fIN2 = 18.9 kHz, each tone at −7 dB below full scale.
Rev. B | Page 3 of 24


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