AD7980 datasheet(3/22 Pages) AD

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Preliminary Technical Data

AD7980

Rev Pr C | Page 3 of 22

SPECIFICATIONS

VDD = 2.5 V, VIO = 2.3 V to 5.5V, VREF = 5V, TA = –40°C to +85°C, unless otherwise noted.

Table 2.

Parameter

Conditions

Min

Typ

Max

Unit

RESOLUTION

Bits

ANALOG INPUT

Voltage Range

IN+ − IN−

+VREF

Absolute Input Voltage

IN+

−0.1

VREF + 0.1

IN−

−0.1

+0.1

Analog Input CMRR

fIN = 1 MHz

Leakage Current at 25°C

Acquisition phase

Input Impedance

See the Analog Input section

ACCURACY

No Missing Codes

Bits

Differential Linearity Error

−1

±0.5

LSB1

Integral Linearity Error

−2

±1

LSB

Transition Noise

REF = 5 V

0.58

LSB

REF = 2.5 V

LSB

Gain Error2, TMIN to TMAX

±2

LSB

Gain Error Temperature Drift

±1

ppm/°C

Zero Error2, TMIN to TMAX

±0.5

Zero Temperature Drift

±1

ppm/°C

Power Supply Sensitivity

VDD = 2.5V

± 5%

±0.1

LSB

THROUGHPUT

Conversion Rate

MSPS

Transient Response

Full-scale step

250

AC ACCURACY

Signal-to-Noise

fIN = 20 kHz, VREF = 5 V

91.5

fIN = 20 kHz, VREF = 2.5 V

87.5

Spurious-Free Dynamic Range

fIN = 20 kHz

−103.5

Total Harmonic Distortion

fIN = 20 kHz

−101

Signal-to-(Noise + Distortion)

fIN = 20 kHz, VREF = 5 V

91.5

fIN = 20 kHz, VREF = 2.5 V

87.5

Intermodulation Distortion3

-105

1 LSB means least significant bit. With the 5 V input range, one LSB is 76.3 μV.

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

3 fIN1 = 21.4 kHz, fIN2 = 16.9 kHz, each tone at −7 dB below full-scale.

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