AD7785 datasheet(5/32 Pages) AD

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AD7785

Rev. 0 | Page 5 of 32

Parameter

AD7785B1

Unit

Test Conditions/Comments

SCLK, CLK, and DIN (Schmitt-

Triggered Input)2

VT(+)

1.4/2

V min/V max

DVDD = 5 V

VT(–)

0.8/1.7

V min/V max

DVDD = 5 V

VT(+)

− VT(−)

0.1/0.17

V min/V max

DVDD = 5 V

VT(+)

0.9/2

V min/V max

DVDD = 3 V

VT(–)

0.4/1.35

V min/V max

DVDD = 3 V

VT(+)

− VT(−)

0.06/0.13

V min/V max

DVDD = 3 V

Input Currents

Input Capacitance

±10

μA max

pF typ

VIN = DVDD or GND

All digital inputs

LOGIC OUTPUTS (INCLUDING CLK)

VOH, Output High Voltage2

DVDD

− 0.6

V min

DVDD = 3 V, ISOURCE = 100 μA

VOL, Output Low Voltage2

0.4

V max

DVDD = 3 V, ISINK = 100 μA

VOH, Output High Voltage2

V min

DVDD = 5 V, ISOURCE = 200 μA

VOL, Output Low Voltage2

0.4

V max

DVDD = 5 V, ISINK = 1.6 mA (DOUT/RDY)/

800 μA (CLK)

Floating-State Leakage Current

±10

μA max

Floating-State Output Capacitance

pF typ

Data Output Coding

Offset binary

SYSTEM CALIBRATION2

Full-Scale Calibration Limit

+1.05 × FS

V max

Zero-Scale Calibration Limit

−1.05 × FS

V min

Input Span

0.8 × FS

V min

2.1 × FS

V max

POWER REQUIREMENTS7

Power Supply Voltage

AVDD

to GND

2.7/5.25

V min/max

DVDD

to GND

2.7/5.25

V min/max

Power Supply Currents

IDD Current

140

μA max

110 μA typ @ AVDD = 3 V, 125 μA typ @ AVDD = 5 V,

unbuffered mode, external reference

185

μA max

130 μA typ @ AVDD = 3 V, 165 μA typ @ AVDD = 5 V,

buffered mode, gain = 1 or 2, external reference

400

μA max

300 μA typ @ AVDD = 3 V, 350 μA typ @ AVDD = 5 V,

gain = 4 to 128, external reference

500

μA max

400 μA typ @ AVDD = 3 V, 450 μA typ @ AVDD = 5 V,

gain = 4 to 128, internal reference

IDD (Power-Down Mode)

μA max

1 Temperature range is –40°C to +105°C.

2 Specification is not production tested, but is supported by characterization data at initial product release.

3 Following a calibration, this error is in the order of the noise for the programmed gain and update rate selected.

4 Recalibration at any temperature removes these errors.

5 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V, gain = 1, TA = 25°C).

6 FS[3:0] are the four bits used in the mode register to select the output word rate.

7 Digital inputs equal to DVDD or GND with excitation currents and bias voltage generator disabled.

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