AD8021 datasheet(3/28 Pages) AD

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AD7986

Rev. B | Page 3 of 28

SPECIFICATIONS

AVDD = DVDD = 2.5 V, BVDD = 5 V, VIO = 1.8 V to 2.7 V, VREF = 4.096 V, 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−)

−V

REF

Absolute Input Voltage

IN+, IN−

−0.1

REF + 0.1

Common-Mode Input Range

IN+, IN−

REF × 0.475

REF × 0.5

REF × 0.525

Analog Input CMRR

IN = 500 kHz

100

dB1

Leakage Current at 25°C

Acquisition phase

250

Input Impedance

See the Analog Inputs section

ACCURACY

No Missing Codes

Bits

Differential Linearity Error

−0.95

±0.60

+1.50

LSB2

Integral Linearity Error

−2.50

±1.00

+2.50

LSB2

Transition Noise

2.0

LSB2

Gain Error, T

MIN to TMAX

−20

±2.4

+20

LSB2

Gain Error Temperature Drift

±0.5

ppm/°C

Zero Error, T

MIN to TMAX

−0.8

+0.8

Zero Temperature Drift

±0.3

ppm/°C

Power Supply Sensitivity

AVDD = 2.5 V ± 5%

±4

LSB2

THROUGHPUT

Conversion Rate

2.00

MSPS

Transient Response

Full-scale step

100

AC ACCURACY

Dynamic Range

REF = 4.096 V, internal reference

95.5

96.5

dB1

REF = 5.0 V, external reference

Signal-to-Noise Ratio, SNR

IN = 20 kHz, VREF = 4.096 V, internal

reference

94.5

95.5

dB1

IN = 20 kHz, VREF = 5.0 V, external

reference

96.5

97.0

dB1

Spurious-Free Dynamic Range, SFDR

IN = 20 kHz

−115

dB1

Total Harmonic Distortion4, THD

IN = 20 kHz, VREF = 4.096 V, internal

reference

−113

dB1

IN = 20 kHz, VREF = 5.0 V, external

reference

−114

dB1

Signal-to-(Noise + Distortion), SINAD

IN = 20 kHz, VREF = 4.096 V

94.5

95.5

dB1

SAMPLING DYNAMICS

−3 dB Input Bandwidth

MHz

Aperture Delay

0.7

1 All specifications expressed in decibels are referred to a full-scale input FSR and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.

2 LSB means least significant bit. With the ±4.096 V input range, one LSB is 31.25 µV.

3 See the Terminology section. These specifications include full temperature range variation but not the error contribution from the external reference.

4 Tested fully in production at f

IN = 1 kHz.

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