AD7946 Просмотр технического описания (PDF) - Analog Devices

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AD7946

14-Bit, 500 kSPS PulSAR ADC in MSOP

Analog Devices 

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

RESOLUTION

ANALOG INPUT

Voltage Range

Absolute Input Voltage

Analog Input CMRR

Leakage Current at 25°C

Input Impedance

ACCURACY

No Missing Codes

Differential Linearity Error

Integral Linearity Error

Transition Noise

Gain Error2, TMIN to TMAX

Gain Error Temperature Drift

Offset Error2, TMIN to TMAX

Offset Temperature Drift

Power Supply Sensitivity

THROUGHPUT

Conversion Rate

Transient Response

AC ACCURACY

Signal-to-Noise

Spurious-Free Dynamic Range

Total Harmonic Distortion

Signal-to-(Noise + Distortion)

Intermodulation Distortion4

Conditions

IN+ − IN−

IN+

IN−

fIN = 200 kHz

Acquisition phase

REF = VDD = 5 V

VDD = 5 V ± 5%

Full-scale step

fIN = 20 kHz, REF = 5 V

fIN = 20 kHz, REF = 2.5 V

fIN = 20 kHz

fIN = 20 kHz

fIN = 20 kHz, REF = 5 V

fIN = 20 kHz, REF = 5 V, −60 dB input

Min Typ

Max

14

0

REF

−0.1

VDD + 0.1

−0.1

0.1

65

1

See the Analog Input section

14

−0.7 ±0.3

+0.7

−1

±0.4

+1

0.33

±0.3

±6

±1

±0.3

±6

±1

±0.1

0

500

400

84.5 85

84

−100

−100

84.5 85

25

100

Unit

Bits

V

V

V

dB

nA

Bits

LSB1

LSB

LSB

LSB

ppm/°C

LSB

ppm/°C

LSB

kSPS

ns

dB3

dB

dB

dB

dB

dB

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. A | Page 3 of 24

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