AD7940 datasheet(3/24 Pages) AD

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Preliminary Technical Data

AD7693

Rev. PrB | Page 3 of 24

SPECIFICATIONS

VDD = 4.5 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

IN+ − (IN−)

−VREF

+VREF

Absolute Input Voltage

IN+, IN−

−0.1

VREF + 0.1

Common-Mode Input Range

IN+, IN−

VREF/2

VREF/2 + 0.1

Analog Input CMRR

fIN = 250 kHz

Leakage Current at 25°C

Acquisition phase

Input Impedance1

THROUGHPUT

Conversion Rate

500

kSPS

Transient Response

Full-scale step

400

ACCURACY

No Missing Codes

Bits

Integral Linearity Error

−0.65

±0.25

+0.65

LSB

Differential Linearity Error

−0.5

±0.2

+0.5

LSB2

Transition Noise

REF = VDD = 5 V

0.16

LSB

Gain Error3

-30

±1.5

+30

LSB

Gain Error Temperature Drift

±0.5

ppm/°C

Zero Error3

−10

+10

LSB

Zero Temperature Drift

±1

ppm/°C

Power Supply Sensitivity

VDD = 5 V

± 5%

±1

ppm

AC ACCURACY

Dynamic Range

VREF = 5 V

96.5

dB4

Signal-to-Noise

fIN = 1 kHz, VREF = 5 V

95.5

fIN = 1 kHz, VREF = 2.5 V

Spurious-Free Dynamic Range

fIN = 1 kHz, VREF = 5 V

−120

Total Harmonic Distortion

fIN = 1 kHz, VREF = 5 V

−120

Signal-to-(Noise + Distortion)

fIN = 1 kHz, VREF = 5 V

95.5

Intermodulation Distortion5

TBD

1 See the Analog Inputs section.

2 LSB means least significant bit. With the ±5 V input range, one LSB is 152.6 μV.

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

4 All specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.

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

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