AD79821 datasheet(3/24 Pages) AD

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AD7946

Rev. A | Page 3 of 24

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

Conditions

Min

Typ

Max

Unit

RESOLUTION

Bits

ANALOG INPUT

Voltage Range

IN+ − IN−

REF

Absolute Input Voltage

IN+

−0.1

VDD + 0.1

IN−

−0.1

0.1

Analog Input CMRR

fIN = 200 kHz

Leakage Current at 25°C

Acquisition phase

Input Impedance

See the Analog Input section

ACCURACY

No Missing Codes

Bits

Differential Linearity Error

−0.7

±0.3

+0.7

LSB1

Integral Linearity Error

−1

±0.4

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

500

kSPS

Transient Response

Full-scale step

400

AC ACCURACY

Signal-to-Noise

fIN = 20 kHz, REF = 5 V

84.5

dB3

fIN = 20 kHz, REF = 2.5 V

Spurious-Free Dynamic Range

fIN = 20 kHz

−100

Total Harmonic Distortion

fIN = 20 kHz

−100

Signal-to-(Noise + Distortion)

fIN = 20 kHz, REF = 5 V

84.5

fIN = 20 kHz, REF = 5 V, −60 dB input

Intermodulation Distortion4

100

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.

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