AD7724AST datasheet(2/14 Pages) AD

2 / 14 page

REV. A

–2–

AD7724–SPECIFICATIONS1(AVDD = 5 V 5%; DVDD = 5 V 5%, DVDD1 = 3 V 5%; AGND = DGND = 0 V,

fMCLK = 13 MHz ac-coupled sine wave, REF2A = REF2B = 2.5 V; TA = TMIN to TMAX, unless otherwise noted.)

Parameter

A Version

Unit

Test Conditions/Comments

STATIC PERFORMANCE

When Tested with Ideal FIR Filter as in Figure 1

Integral Nonlinearity

±0.003

% FSR typ

Offset Error

±0.24

% FSR typ

Gain Error

±0.6

% FSR typ

Offset Error Drift

±37.69

µV/°C typ

Gain Error Drift

REF2 Is an Ideal Reference, REF1 = AGND

Unipolar Mode

±37.69

µV/°C typ

Bipolar Mode

±18.85

µV/°C typ

ANALOG INPUTS

Signal Input Span (VIN(+) – VIN(–))

Bipolar Mode

±V

REF2/2

V max

BIP = VIH

Unipolar Mode

0 to VREF2

V max

BIP = VIL

Maximum Input Voltage

AVDD

Minimum Input Voltage

Input Sampling Capacitance

pF typ

Input Sampling Rate

2 fMCLK

MHz

Differential Input Impedance

109/(8 fMCLK)kΩ typ

REFERENCE INPUTS

REF1 Output Voltage

2.32 to 2.68

V min/max

REF1 Output Voltage Drift

ppm/

°C typ

REF1 Output Impedance

Ω typ

Reference Buffer Offset Voltage

±12

mV max

Offset Between REF1 and REF2

Using Internal Reference

REF2 Output Voltage

2.32 to 2.68

V min/max

REF2 Output Voltage Drift

ppm/

°C typ

Using External Reference

REF1 = AGND

REF2 Input Impedance

109/(16 fMCLK)k

Ω typ

External Reference Voltage Range

2.32 to 2.68

V min/max

Applied to REF1 or REF2

DYNAMIC SPECIFICATIONS

When Tested with Ideal FIR Filter as in Figure 1

Bipolar Mode

BIP = VIH, VCM = 2.5 V, VIN(+) = VIN(–) = 1.25 V p-p

or VIN(–) = 1.25 V, VIN(+) = 0 V to 2.5 V

Signal-to-(Noise + Distortion)

dB typ

Input BW = 0 kHz–94.25 kHz

dB min

Total Harmonic Distortion

–90

dB max

Input BW = 0 kHz–94.25 kHz

Spurious Free Dynamic Range

–90

dB max

Input BW = 0 kHz–94.25 kHz

Unipolar Mode

BIP = VIL, VIN(–) = 0 V, VIN(+) = 0 V to 2.5 V

Signal-to-(Noise + Distortion)

dB typ

Input BW = 0 kHz–94.25 kHz

Total Harmonic Distortion

–90

dB typ

Input BW = 0 kHz–101.556 kHz

Spurious Free Dynamic Range

–90

dB typ

Input BW = 0 kHz–101.556 kHz

Intermodulation Distortion

–93

dB typ

AC CMRR

dB typ

VIN(+) = VIN(–) = 2.5 V p-p, VCM = 1.25 V to

3.75 V, 20 kHz

CLOCK

Square Wave

MCLK Duty Ratio

45 to 55

% max

For Specified Operation

VMCLKH, MCLK High Voltage

V min

MCLK Uses CMOS Logic

VMCLKL, MCLK Low Voltage

0.4

V max

Sine Wave

XTAL1 Voltage Swing

0.4

V p-p min

XTAL_OFF Tied Low

V p-p max

LOGIC INPUTS

VIH, Input High Voltage

2.4

V min

VIL, Input Low Voltage

0.8

V max

IINH, Input Current

µA max

CIN, Input Capacitance

pF max

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