AD7997 datasheet(5/32 Pages) AD

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AD7997/AD7998

Rev. 0 | Page 5 of 32

AD7998 SPECIFICATIONS

Temperature range for B version is −40°C to +85°C. Unless otherwise noted, VDD = 2.7 V to 5.5 V; REFIN = 2.5 V; For the AD7998-0, all

specifications apply for fSCL up to 400 kHz; for the AD7998-1, all specifications apply for fSCL up to 3.4 MHz, unless otherwise noted;

TA = TMIN to TMAX.

Table 2.

Parameter

B Version

Unit

Test Conditions/Comments

DYNAMIC PERFORMANCE1

FIN = 10 kHz sine wave for fSCL from 1.7 MHz to

3.4 MHz

FIN = 1 kHz sine wave for fSCL up to 400 kHz

Signal-to-Noise + Distortion (SINAD)2

70.5

dB min

Signal to Noise Ratio (SNR)2

dB min

Total Harmonic Distortion (THD)2

–78

dB max

Peak Harmonic or Spurious Noise (SFDR)2

–79

dB max

Intermodulation Distortion (IMD)2

fa = 10.1 kHz, fb = 9.9 kHz fSCL from 1.7 MHz to

3.4 MHz

fa = 1.1 kHz, fb = 0.9 kHz for fSCL up to 400 kHz

Second-Order Terms

–90

dB typ

Third-Order Terms

–90

dB typ

Aperture Delay2

ns max

Aperture Jitter2

ps typ

Channel-to-Channel Isolation2

–90

dB typ

FIN = 108 Hz, see the Terminology section

Full-Power Bandwidth2

MHz typ

@ 3 dB

MHz typ

@ 0.1 dB

DC ACCURACY

Resolution

Bits

Integral Nonlinearity1,2

±1

LSB max

±0.2

LSB typ

Differential Nonlinearity1,2

+1/–0.9

LSB max

Guaranteed no missed codes to 12 bits

±0.2

LSB typ

Offset Error2

±4

LSB max

Mode 1 (CONVST Mode)

±6

LSB max

Mode 2 (Command Mode)

Offset Error Match2

±1

LSB max

Gain Error2

±2

LSB max

Gain Error Match2

±1

LSB max

ANALOG INPUT

Input Voltage Range

0 to REFIN

DC Leakage Current

± 1

µA max

Input Capacitance

pF typ

REFERENCE INPUT

REFIN Input Voltage Range

1.2 to VDD

V min/V max

DC Leakage Current

± 1

µA max

Input Impedance

kΩ typ

LOGIC INPUTS (SDA, SCL)

Input High Voltage, VINH

0.7 (VDD)

V min

Input Low Voltage, VINL

0.3 (VDD)

V max

Input Leakage Current, IIN

± 1

µA max

VIN = 0 V or VDD

Input Capacitance, CIN 3

pF max

Input Hysteresis, VHYST

0.1 (VDD)

V min

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