AD7713 datasheet(2/28 Pages) AD

2 / 28 page

Parameter

A, S Versions

Units

Conditions/Comments

STATIC PERFORMANCE

No Missing Codes

Bits min

Guaranteed by Design. For Filter Notches

≤ 12 Hz

Bits min

For Filter Notch = 20 Hz

Bits min

For Filter Notch = 50 Hz

Bits min

For Filter Notch = 100 Hz

Bits min

For Filter Notch = 200 Hz

Output Noise

See Tables I & II

Depends on Filter Cutoffs and Selected Gain

Integral Nonlinearity

±0.0015

% of FSR max

Filter Notches

≤ 12 Hz; Typically ±0.0003%

Positive Full-Scale Error2, 3

See Note 4

Full-Scale Drift

µV/°C typ

For Gains of 1, 2

0.3

µV/°C typ

For Gains of 4, 8, 16, 32, 64, 128

Unipolar Offset Error

See Note 4

Unipolar Offset Drift5

0.5

µV/°C typ

For Gains of 1, 2

0.25

µV/°C typ

For Gains of 4, 8, 16, 32, 64, 128

Bipolar Zero Error2

See Note 4

Bipolar Zero Drift

0.5

µV/°C typ

For Gains of 1, 2

0.25

µV/°C typ

For Gains of 4, 8, 16, 32, 64, 128

Gain Drift

ppm/

°C typ

Bipolar Negative Full-Scale Error2

±0.004

% of FSR max

Typically

±0.0006%

Bipolar Negative Full-Scale Drift

µV/°C typ

For Gains of 1, 2

0.3

µV/°C typ

For Gains of 4, 8, 16, 32, 64, 128

ANALOG INPUTS

Input Sampling Rate, fS

See Table III

Normal-Mode 50 Hz Rejection

100

dB min

For Filter Notches of 2 Hz, 5 Hz, 10 Hz, 25 Hz, 50 Hz,

±0.02 × f

NOTCH

Normal-Mode 60 Hz Rejection6

100

dB min

For Filter Notches of 2 Hz, 6 Hz, 10 Hz, 30 Hz, 60 Hz,

±0.02 × f

NOTCH

AIN1, AIN2

Input Voltage Range8

For Normal Operation. Depends on Gain Selected.

0 to +VREF

V max

Unipolar Input Range (B/U Bit of Control Register = 1)

±V

REF

V max

Bipolar Input Range (B/U Bit of Control Register = 0)

Common-Mode Rejection (CMR)

100

dB min

At DC

Common-Mode 50 Hz Rejection6

150

dB min

For Filter Notches of 2 Hz, 5 Hz, 10 Hz, 25 Hz, 50 Hz,

±0.02 × f

NOTCH

Common-Mode 60 Hz Rejection

150

dB min

For Filter Notches of 2 Hz, 6 Hz, 10 Hz, 30 Hz, 60 Hz,

±0.02 × f

NOTCH

Common-Mode Voltage Range

AGND to AVDD

V min to V max

DC Input Leakage Current @ +25

°C

pA max

TMIN to TMAX

nA max

Sampling Capacitance

pF max

AIN3

Input Voltage Range

0 to + 4

× V

REF

V max

For Normal Operation. Depends on Gain Selected

Gain Error

±0.05

% typ

Additional Error Contributed by Resistor Attenuator

Gain Drift

ppm/

°C typ

Additional Drift Contributed by Resistor Attenuator

Offset Error

mV max

Additional Error Contributed by Resistor Attenuator

Input Impedance

Ω min

NOTES

1Temperature range is as follows: A Version, –40

°C to +85°C; S Version, –55°C to +125°C.

2Applies after calibration at the temperature of interest.

3Positive full-scale error applies to both unipolar and bipolar input ranges.

4These errors will be of the order of the output noise of the part as shown in Table I after system calibration. These errors will be 20

µV typical after self-calibration

or background calibration.

5Recalibration at any temperature or use of the background calibration mode will remove these drift errors.

6These numbers are guaranteed by design and/or characterization.

7The AIN1 and AIN2 analog inputs presents a very high impedance dynamic load which varies with clock frequency and input sample rate. The maximum

recommended source resistance depends on the selected gain.

8The analog input voltage range on the AIN1(+) and AIN2(+) inputs is given here with respect to the voltage on the AIN1(–) and AIN2 (–) inputs. The input

voltage range on the AIN3 input is with respect to AGND. The absolute voltage on the AIN1 and AIN2 inputs should not go more positive than A VDD + 30 mV or

more negative than AGND – 30 mV.

REF = REF IN(+) – REF IN(–).

10This common-mode voltage range is allowed provided that the input voltage on AIN(+) and AIN(–) does not exceed A V

DD + 30 mV and AGND – 30 mV.

11This error can be removed using the system calibration capabilities of the AD7713. This error is not removed by the AD7713’s self-calibration feature. The offset

drift on the AIN3 input is four times the value given in the Static Performance section.

–2–

REV. C

(AVDD = +5 V

5%; DVDD = +5 V

5%; REF IN(+) = +2.5 V; REF IN(–) = AGND;

MCLK IN = 2 MHz unless otherwise noted. All specifications TMIN to TMAX unless otherwise noted.)

AD7713–SPECIFICATIONS

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