ADAQ7980 datasheet(7/49 Pages) AD

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Data Sheet

ADAQ7980/ADAQ7988

Rev. 0 | Page 7 of 49

SINGLE-SUPPLY CONFIGURATION

VDD = V+ = 5.0 V, V− = 0 V, VIO = 1.7 V to 5.5 V, VREF = 3.3 V, TA = −55°C to +125°C, the ADC driver in a unity-gain buffer configuration, and

fSAMPLE = 1 MSPS (ADAQ7980) and fSAMPLE = 500 kSPS (ADAQ7988), unless otherwise noted.

Table 4.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

RESOLUTION

Bits

SYSTEM ACCURACY

Differential Nonlinearity Error1

−14

±7

+14

ppm2

Integral Nonlinearity Error1

−20

±8

+20

ppm2

Transition Noise

0.8

LSB2 rms

Gain Error

TA = 25°C

−0.013

±0.002

+0.013

%FS

Gain Error Temperature Drift

0.1

0.4

ppm/°C

Zero Error

TA = 25°C

−0.5

±0.06

+0.5

Zero Error Temperature Drift

0.35

1.75

µV/°C

Common-Mode Rejection Ratio

103

133

Power Supply Rejection Ratio

Positive

V+ = 4.5 V to 5.5 V, V− = 0 V

SYSTEM AC PERFORMANCE

Dynamic Range

dB3

Total RMS Noise

41.4

µV rms

Oversampled Dynamic Range

fODR = 10 kSPS

109

dB3

Signal-to-Noise Ratio

Input frequency (fIN) = 10 kHz

87.3

88.7

dB3

Spurious-Free Dynamic Range

fIN = 10 kHz

103

dB3

Total Harmonic Distortion

fIN = 10 kHz

−113

−100

dB3

Signal-to-Noise-and-Distortion Ratio

fIN = 10 kHz

88.4

dB3

Effective Number of Bits

fIN = 10 kHz

14.1

14.4

Bits

Noise Free Code Resolution

13.5

Bits

SYSTEM SAMPLING DYNAMICS

Conversion Rate

ADAQ7980

VIO ≥ 3.0 V

MSPS

VIO ≥ 1.7 V

833

kSPS

ADAQ7988

VIO ≥ 1.7 V

500

kSPS

Transient Response

Full-scale step

430

500

−3 dB Input Bandwidth

ADC driver RC filter

4.42

MHz

−1 dB Frequency

ADC driver RC filter

2.2

MHz

−0.1 dB Frequency

ADC driver RC filter

0.67

MHz

System 0.1 Hz to 10 Hz Voltage Noise

µV p-p

Aperture Delay

2.0

Aperture Jitter

2.0

Nonlinearity guaranteed over input voltage range. Codes below 150 mV are not represented with a unipolar supply configuration.

LSB means least significant bit. With the 3.3 V input range, 1 LSB = 50.4 µV, and 1 LSB = 15.26 ppm.

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.

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