AD7722AS datasheet(2/24 Pages) AD

2 / 24 page

REV. B

–2–

AD7722–SPECIFICATIONS1 (AV

DD = AVDD1 = 5 V

5%; DVDD = 5 V

5%; AGND = AGND1 = DGND = 0 V;

UNI = Logic Low or High; f

CLKIN = 12.5 MHz; fS = 195.3 kSPS; REF2 = 2.5 V; TA = TMIN to TMAX, unless otherwise noted.)

A Version

Parameter

Test Conditions/Comments

Min

Typ

Max

Unit

DYNAMIC SPECIFICATIONS

Bipolar Mode,

UNI = V

INH

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)

Input Bandwidth 0 kHz–90.625 kHz

86/84.5

Input Bandwidth 0 kHz–100 kHz, fCLKIN = 14 MHz

84.5/83

Total Harmonic Distortion

Input Bandwidth 0 kHz–90.625 kHz

–90/–88

Input Bandwidth 0 kHz–100 kHz, fCLKIN = 14 MHz

–88/–86

Spurious-Free Dynamic Range

Input Bandwidth 0 kHz–90.625 kHz

–90

Input Bandwidth 0 kHz–100 kHz, fCLKIN = 14 MHz

–88

Unipolar Mode,

UNI = V

INL

VIN(–) = 0 V, VIN(+) = 0 V to 2.5 V

Signal-to-(Noise + Distortion)

Input Bandwidth 0 kHz–90.625 kHz

84.5/83

Total Harmonic Distortion

Input Bandwidth 0 kHz–97.65 kHz

–89/–87

Spurious-Free Dynamic Range

Input Bandwidth 0 kHz–97.65 kHz

–90

Intermodulation Distortion

–93

AC CMRR

VIN(+) = VIN(–) = 2.5 V p-p

VCM = 1.25 V to 3.75 V, 20 kHz

Digital Filter Response

Pass-Band Ripple

0 kHz to 90.625 kHz

±0.005

Cutoff Frequency

96.92

kHz

Stop-Band Attenuation

104.6875 kHz to 12.395 MHz

ANALOG INPUTS

Full-Scale Input Span

VIN(+) – VIN(–)

Bipolar Mode

UNI = V

INH

–VREF2/2

+VREF2/2

Unipolar Mode

UNI = V

INL

0VREF2

Absolute Input Voltage

VIN(+) and VIN(–)0

AVDD

Input Sampling Capacitance

2pF

Input Sampling Rate

Guaranteed by Design

× f

CLKIN

Differential Input Impedance

1/(4

× 10-9)f

CLKIN

Ω

CLOCK

CLKIN Mark Space Ratio

REFERENCE

REF1 Output Voltage

2.32

2.47

2.62

REF1 Output Voltage Drift

ppm/

°C

REF1 Output Impedance

Ω

Reference Buffer

Offset Voltage

Offset between REF1 and REF2

±12

Using Internal Reference

REF2 Output Voltage

2.32

2.47

2.62

REF2 Output Voltage Drift

ppm/

°C

Using External Reference

REF2 Input Impedance

REF1 = AGND

1/(16

× 10−9)f

CLKIN

Ω

External Reference Voltage Range

Applied to REF1 or REF2

2.32

2.5

2.62

STATIC PERFORMANCE

Resolution

Bits

Differential Nonlinearity

Guaranteed Monotonic

±0.5

±1LSB

Integral Nonlinearity

±2LSB

After Calibration

Offset Error

±3mV

Gain Error

4, 5

±0.6

% FSR

Without Calibration

Offset Error

±6mV

Gain Error

±0.6

% FSR

Offset Error Drift

±1

LSB/

°C

Gain Error Drift

REF2 Is an Ideal Reference, REF1 = AGND

Unipolar Mode

±1

LSB/

°C

Bipolar Mode

±0.5

LSB/

°C

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