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AD7643

Rev. 0 | Page 3 of 28

SPECIFICATIONS

AVDD = DVDD = 2.5 V; OVDD = 2.3 V to 3.6 V; VREF = 2.5 V; all specifications TMIN to TMAX, unless otherwise noted.

Table 2.

Parameter

Conditions

Min

Typ

Max

Unit

RESOLUTION

Bits

ANALOG INPUT

Voltage Range

VIN+ − VIN−

−VREF

+VREF

Operating Input Voltage

VIN+, VIN− to AGND

−0.1

AVDD1

Analog Input CMRR

fIN = 100 kHz

Input Current

1.25 MSPS throughput

2.5

μA

Input Impedance2

THROUGHPUT SPEED

Complete Cycle

800

Throughput Rate

1.25

MSPS

DC ACCURACY

Integral Linearity Error3

−3

±1.5

LSB4

No Missing Codes

Bits

Differential Linearity Error

−1

+1.25

LSB

Transition Noise

VREF = 2.5 V

1.7

LSB

VREF = 2.048 V

2.0

LSB

Zero Error, TMIN to TMAX5

−16

+16

LSB

Zero Error Temperature Drift

±1

ppm/°C

Gain Error, TMIN to TMAX5

−22

+22

LSB

Gain Error Temperature Drift

±1

ppm/°C

Power Supply Sensitivity

AVDD = 2.5 V ± 5%

±16

LSB

AC ACCURACY

Dynamic Range

VREF = 2.5 V

dB6

Signal-to-Noise

fIN = 1 kHz, VREF = 2.5 V

93.5

fIN = 20 kHz, VREF = 2.5 V

93.5

fIN = 20 kHz, VREF = 2.048 V

fIN = 100 kHz, VREF = 2.5 V

Spurious-Free Dynamic Range

fIN = 1 kHz, VREF = 2.5 V

118

fIN = 20 kHz, VREF = 2.5 V

114

fIN = 20 kHz, VREF = 2.048 V

111

fIN = 100 kHz, VREF = 2.5 V

108

Total Harmonic Distortion

fIN = 1 kHz, VREF = 2.5 V

−114

fIN = 20 kHz, VREF = 2.5 V

−113

fIN = 20 kHz, VREF = 2.048 V

−109

fIN = 100 kHz, VREF = 2.5 V

−105

Signal-to-(Noise + Distortion)

fIN = 1 kHz, VREF = 2.5 V

93.5

fIN = 20 kHz, VREF = 2.5 V

93.5

fIN = 20 kHz, VREF = 2.048 V

91.8

fIN = 100 kHz, VREF = 2.5 V

92.5

−3 dB Input Bandwidth

MHz

SAMPLING DYNAMICS

Aperture Delay

Aperture Jitter

ps rms

Transient Response

Full-scale step

250

INTERNAL REFERENCE

PDREF = PDBUF = low

Output Voltage

REF @ 25°C

2.038

2.048

2.058

Temperature Drift

−40°C to +85°C

±8

ppm/°C

Line Regulation

AVDD = 2.5 V ± 5%

±15

ppm/V

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