AD7690 datasheet(4/25 Pages) AD

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Data Sheet

AD7690

SPECIFICATIONS

VDD = 4.75 V to 5.25 V, VIO = 2.3 V to VDD, VREF = VDD, all specifications TMIN to TMAX, unless otherwise noted.

Table 2.

Parameter

Conditions

Min

Typ

Max

Unit

RESOLUTION

Bits

ANALOG INPUT

Voltage Range

IN+ to IN−

−VREF

+VREF

Absolute Input Voltage

IN+, IN−

−0.1

VREF + 0.1

Common-Mode Input Range

IN+, IN−

VREF/2 − 0.1

VREF/2

VREF/2 + 0.1

Analog Input CMRR

fIN = 250 kHz

Leakage Current at 25°C

Acquisition phase

Input Impedance1

THROUGHPUT

Conversion Rate

400

kSPS

Transient Response

Full-scale step

400

ACCURACY

No Missing Codes

Bits

Integral Linearity Error

−1.5

±0.75

+1.5

LSB2

Differential Linearity Error

−1

±0.5

+1.25

LSB

Transition Noise

REF = VDD = 5 V

0.75

LSB

Gain Error3

−40

±2

+40

LSB

Gain Error Temperature Drift

±0.3

ppm/°C

Zero Error3

−0.8

+0.8

Zero Temperature Drift

±0.3

ppm/°C

Power Supply Sensitivity

VDD = 5 V ± 5%

±0.25

LSB

AC ACCURACY

Dynamic Range

VREF = 5 V

101

102

dB4

Oversampled Dynamic Range5

fIN= 1 kSPS

125

Signal-to-Noise

fIN = 1 kHz, VREF = 5 V

100

101.5

fIN = 1 kHz, VREF = 2.5 V

94.5

Spurious-Free Dynamic Range

fIN = 1 kHz, VREF = 5 V

−125

Total Harmonic Distortion

fIN = 1 kHz, VREF = 5 V

−125

Signal-to-(Noise + Distortion)

fIN = 1 kHz, VREF = 5 V

100

101.5

Intermodulation Distortion6

115

See the Analog Inputs section.

LSB means least significant bit. With the ±5 V input range, one LSB is 38.15 µV.

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

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.

Dynamic range obtained by oversampling the ADC running at a throughput fS of 400 kSPS, followed by postdigital filtering with an output word rate fO.

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

Rev. C | Page 3 of 24

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