AD7691_15 datasheet(3/28 Pages) AD

Il numero della parte	AD7691

Spiegazioni elettronici	18-Bit, 1.5 LSB INL, 250 kSPS PulSAR

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3 / 28 page

Data Sheet

AD7691

Rev. D | Page 3 of 28

SPECIFICATIONS

VDD = 2.3 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/Comments

Min

Typ

Max

Unit

RESOLUTION

18

Bits

ANALOG INPUT

Voltage Range, VIN

IN+ − (IN−)

−VREF

+VREF

V

Absolute Input Voltage

IN+, IN−

−0.1

VREF + 0.1

V

Common-Mode Input Range

IN+, IN−

VREF/2 − 0.1

VREF/2

VREF/2 + 0.1

V

Analog Input CMRR

fIN = 250 kHz

65

dB

Leakage Current at 25°C

Acquisition phase

1

nA

Input Impedance1

THROUGHPUT

Conversion Rate

VDD = 4.5 V to 5.25 V

0

250

kSPS

VDD = 2.3 V to 4.5 V

0

180

kSPS

Transient Response

Full-scale step

1.8

μs

ACCURACY

No Missing Codes

18

Bits

Integral Linearity Error

−1.5

±0.75

+1.5

LSB2

Differential Linearity Error

−1

±0.5

+1.25

LSB2

Transition Noise

REF = VDD = 5 V

0.75

LSB2

Gain Error3

VDD = 4.5 V to 5.25 V

−40

±2

+40

LSB2

VDD = 2.3 V to 4.5 V

−80

±2

+80

LSB2

Gain Error Temperature Drift

±0.3

ppm/°C

Zero Error3

VDD = 4.5 V to 5.25 V

−0.8

±0.1

+0.8

mV

VDD = 2.3 V to 4.5 V

−3.5

±0.7

+3.5

mV

Zero Temperature Drift

±0.3

ppm/°C

Power Supply Sensitivity

VDD = 5 V

 5%

±0.25

LSB2

AC ACCURACY4

Dynamic Range

VREF = 5 V

101

102

dB

Oversampled Dynamic Range5

fIN = 1 kSPS

125

dB

Signal-to-Noise

fIN = 1 kHz, VREF = 5 V

100

101.5

dB

fIN = 1 kHz, VREF = 2.5 V

95

96.5

dB

Spurious-Free Dynamic Range

fIN = 1 kHz, VREF = 5 V

−125

dB

Total Harmonic Distortion

fIN = 1 kHz, VREF = 5 V

−118

dB

Signal-to-(Noise + Distortion)

fIN = 1 kHz, VREF = 5 V

100

101.5

dB

fIN = 1 kHz, VREF = 2.5 V

95

96.5

dB

Intermodulation Distortion6

115

dB

1 See the Analog Inputs section.

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

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

4 All ac accuracy 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 Dynamic range obtained by oversampling the ADC running at a throughput fS of 250 kSPS, followed by postdigital filtering with an output word rate fO.

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

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