AD7682 datasheet(3/20 Pages) AD

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Preliminary Technical Data

AD7689

Rev. PrC | Page 3 of 20

SPECIFICATIONS

VDD = 2.5 V to 5.5 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.

Table 2.

Parameter

Conditions/Comments

Min

Typ

Max

Unit

RESOLUTION

Bits

ANALOG INPUT

Voltage Range

Unipolar mode

+VREF

Bipolar mode

−VREF/2

+VREF/2

Absolute Input Voltage

Positive input, unipolar and

bipolar mode

−0.1

VREF + 0.1

Negative or COM input, unipolar

mode

−0.1

+0.1

Negative or COM input, bipolar

mode

VREF/2 – 0.1

VREF/2

VREF/2 + 0.1

Analog Input CMRR

fIN = 250 kHz

TBD

Leakage Current at 25°C

Acquisition phase

Input Impedance1

THROUGHPUT

Conversion Rate

VDD = 4.096V to 5.5

250

kSPS

VDD = 2.5V to 4.096V

200

Transient Response

Full-scale step

1.8

μs

ACCURACY

No Missing Codes

Bits

Integral Linearity Error

-2

±0.6

LSB2

Differential Linearity Error

−1

±0.25

+1.5

LSB

Transition Noise

REF = VDD = 5 V

0.5

LSB

Gain Error3

−30

±0.5

+30

LSB

Gain Error Match

TBD

LSB

Gain Error Temperature Drift

±0.3

ppm/°C

Offset Error3

−5

±0.5

LSB

Offset Error Match

TBD

LSB

Offset Error Temperature Drift

±0.3

ppm/°C

Power Supply Sensitivity

VDD = 5 V

± 5%

±1

ppm

AC ACCURACY4

Dynamic Range

93.5

dB5

Signal-to-Noise

fIN = 20 kHz, VREF = 5V

92.5

fIN = 20 kHz, VREF = 2.5V

88.5

Signal-to-(Noise + Distortion)

fIN = 20 kHz, VREF = 5V

92.5

fIN = 20 kHz, VREF = 2.5V

88.5

Total Harmonic Distortion

fIN = 20 kHz

−100

Spurious-Free Dynamic Range

fIN = 20 kHz

110

Channel-to-Channel Crosstalk

fIN = 100 kHz on adjacent

channel(s)

-117

Intermodulation Distortion6

115

SAMPLING DYNAMICS

−3 dB Input Bandwidth

Selectable

0.425

1.7

MHz

Aperture Delay

VDD = 5V

2.5

1 See the Analog Inputs section.

2 LSB means least significant bit. With the 5 V input range, one LSB is 76.3 μV.

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

4 With VREF = 5 V, unless otherwise noted.

5 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.

6 fIN1 = 21.4 kHz and fIN2 = 18.9 kHz, with each tone at −7 dB below full scale.

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