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AD7691

18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/LFCSP

Analog Devices 

Data Sheet

AD7691

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

RESOLUTION

ANALOG INPUT

Voltage Range, VIN

Absolute Input Voltage

Common-Mode Input Range

Analog Input CMRR

Leakage Current at 25°C

Input Impedance1

THROUGHPUT

Conversion Rate

Transient Response

ACCURACY

No Missing Codes

Integral Linearity Error

Differential Linearity Error

Transition Noise

Gain Error3

Gain Error Temperature Drift

Zero Error3

Zero Temperature Drift

Power Supply Sensitivity

AC ACCURACY4

Dynamic Range

Oversampled Dynamic Range5

Signal-to-Noise

Spurious-Free Dynamic Range

Total Harmonic Distortion

Signal-to-(Noise + Distortion)

Intermodulation Distortion6

Conditions/Comments

IN+ − (IN−)

IN+, IN−

IN+, IN−

fIN = 250 kHz

Acquisition phase

VDD = 4.5 V to 5.25 V

VDD = 2.3 V to 4.5 V

Full-scale step

REF = VDD = 5 V

VDD = 4.5 V to 5.25 V

VDD = 2.3 V to 4.5 V

VDD = 4.5 V to 5.25 V

VDD = 2.3 V to 4.5 V

VDD = 5 V ± 5%

VREF = 5 V

fIN = 1 kSPS

fIN = 1 kHz, VREF = 5 V

fIN = 1 kHz, VREF = 2.5 V

fIN = 1 kHz, VREF = 5 V

fIN = 1 kHz, VREF = 5 V

fIN = 1 kHz, VREF = 5 V

fIN = 1 kHz, VREF = 2.5 V

Min

Typ

Max

Unit

18

Bits

−VREF

−0.1

VREF/2 − 0.1

VREF/2

65

1

+VREF

V

VREF + 0.1

V

VREF/2 + 0.1 V

dB

nA

0

250

kSPS

0

180

kSPS

1.8

μs

18

Bits

−1.5

±0.75 +1.5

LSB2

−1

±0.5

+1.25

LSB2

0.75

LSB2

−40

±2

+40

LSB2

−80

±2

+80

LSB2

±0.3

ppm/°C

−0.8

±0.1

+0.8

mV

−3.5

±0.7

+3.5

mV

±0.3

ppm/°C

±0.25

LSB2

101

102

dB

125

dB

100

101.5

dB

95

96.5

dB

−125

dB

−118

dB

100

101.5

dB

95

96.5

dB

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.

Rev. E | Page 3 of 28

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