AD7946 Analog Devices, AD7946 Datasheet - Page 3

• Manufacturer Part Number: AD7946
• Manufacturer: Analog Devices

Specifications of AD7946

• Resolution (bits): 14bit
• # Chan: 1
• Sample Rate: 500kSPS
• Interface: Ser,SPI
• Analog Input Type: Diff-Uni
• Ain Range: (Vref) p-p
• Adc Architecture: SAR
• Pkg Type: CSP,SOP

SPECIFICATIONS
VDD = 4.5 V to 5.5 V, VIO = 2.3 V to VDD, REF = VDD, T
Table 2.
Parameter
RESOLUTION
ANALOG INPUT
ACCURACY
THROUGHPUT
AC ACCURACY
1
2
3
4
LSB means least significant bit. With the 5 V input range, one LSB is 305.2 μV.
See the Terminology section. These specifications do include full temperature range variation but do not include the error contribution from the external reference.
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.
f
IN1
Voltage Range
Absolute Input Voltage
Analog Input CMRR
Leakage Current at 25°C
Input Impedance
No Missing Codes
Differential Linearity Error
Integral Linearity Error
Transition Noise
Gain Error
Gain Error Temperature Drift
Offset Error
Offset Temperature Drift
Power Supply Sensitivity
Conversion Rate
Transient Response
Signal-to-Noise
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise + Distortion)
Intermodulation Distortion
= 21.4 kHz, f
2
, T
2
IN2
, T
MIN
= 18.9 kHz, each tone at −7 dB below full scale.
MIN
to T
to T
MAX
MAX
4
Conditions
IN+ − IN−
IN+
IN−
f
Acquisition phase
REF = VDD = 5 V
VDD = 5 V ± 5%
Full-scale step
f
f
f
f
f
f
IN
IN
IN
IN
IN
IN
IN
= 200 kHz
= 20 kHz, REF = 5 V
= 20 kHz, REF = 2.5 V
= 20 kHz
= 20 kHz
= 20 kHz, REF = 5 V
= 20 kHz, REF = 5 V, −60 dB input
A
Rev. A | Page 3 of 24
= −40°C to +85°C, unless otherwise noted.
Min
14
0
−0.1
−0.1
14
−0.7
−1
0
84.5
84.5
See the Analog Input section
±0.3
±0.1
Typ
65
1
±0.4
0.33
±0.3
±1
±0.3
±1
85
84
−100
−100
85
25
100
Max
REF
VDD + 0.1
0.1
+0.7
+1
±6
±6
500
400
AD7946
Unit
Bits
V
V
V
dB
nA
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
ppm/°C
LSB
kSPS
ns
dB
dB
dB
dB
dB
dB
dB
3
1