ADAQ7980 datasheet(3/49 Pages) AD

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Data Sheet

ADAQ7980/ADAQ7988

Rev. 0 | Page 3 of 49

SPECIFICATIONS

DUAL-SUPPLY CONFIGURATION

VDD = 3.5 V to 10 V, V+ = 6.3 V to 7.7 V, V− = −2.5 V to −0.2 V, VIO = 1.7 V to 5.5 V, VREF = 5 V, TA = −55°C to +125°C, ADC driver in

a unity-gain buffer configuration, fSAMPLE = 1 MSPS (ADAQ7980), and fSAMPLE = 500 kSPS (ADAQ7988), unless otherwise noted.

Table 2.

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

RESOLUTION

Bits

SYSTEM ACCURACY

No Missing Codes

Bits

Differential Nonlinearity Error (DNL)

−14

±7

+14

ppm1

Integral Nonlinearity Error (INL)

−20

±8

+20

ppm1

Transition Noise

0.6

LSB1 rms

Gain Error

TA = 25°C

−0.01

±0.002

+0.01

%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

0.3

1.3

µV/°C

Common-Mode Rejection Ratio

ADC driver configured as difference amplifier

103

130

Power Supply Rejection Ratio

Positive

V+ = +6.3 V to +8 V, V− = −2 V

105

Negative

V+ = +7 V, V− = −1.0 V to −2.5 V

110

SYSTEM AC PERFORMANCE

Dynamic Range

dB2

VREF = 2.5 V

dB2

Total RMS Noise

44.4

µV rms

Oversampled Dynamic Range

Oversample dynamic range frequency (fODR) = 10 kSPS

111

dB2

Signal-to-Noise Ratio (SNR)

Input frequency (fIN) = 10 kHz

90.5

91.5

dB2

fIN = 10 kHz, VREF = 2.5 V

84.5

86.5

dB2

Spurious-Free Dynamic Range

fIN = 10 kHz

106

dB2

Total Harmonic Distortion (THD)

fIN = 10 kHz

−105

−100

dB2

Signal-to-Noise-and-Distortion Ratio

fIN = 10 kHz

dB2

fIN = 10 kHz, VREF = 2.5 V

dB2

Effective Number of Bits

fIN = 10 kHz

14.65

14.8

Bits

Noise Free Code Resolution

14.1

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

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