AD7785 datasheet(3/32 Pages) AD

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AD7785

Rev. 0 | Page 3 of 32

SPECIFICATIONS

AVDD = 2.7 V to 5.25 V; DVDD = 2.7 V to 5.25 V; GND = 0 V; all specifications TMIN to TMAX, unless otherwise noted.

Table 1.

Parameter

AD7785B1

Unit

Test Conditions/Comments

ADC CHANNEL

Output Update Rate

4.17 to 470

Hz nom

No Missing Codes2

Bits min

Resolution

See Output Noise and Resolution Specifications

Output Noise and Update Rates

See Output Noise and Resolution Specifications

Integral Nonlinearity

±15

ppm of FSR max

Offset Error3

±1

μV typ

Offset Error Drift vs. Temperature4

±10

nV/°C typ

Full-Scale Error3, 5

±10

μV typ

Gain Drift vs. Temperature4

±1

ppm/°C typ

Gain = 1 to 16, external reference

±3

ppm/°C typ

Gain = 32 to 128, external reference

Power Supply Rejection

100

dB min

AIN = 1 V/gain, gain ≥ 4, external reference

ANALOG INPUTS

Differential Input Voltage Ranges

±VREF/Gain

V nom

VREF = REFIN(+)

− REFIN(−) or internal reference,

gain = 1 to 128

Absolute AIN Voltage Limits2

Unbuffered Mode

GND – 30 mV

V min

Gain = 1 or 2

AVDD + 30 mV

V max

Buffered Mode

GND + 100 mV

V min

Gain = 1 or 2

AVDD – 100 mV

V max

In-Amp Active

GND + 300 mV

V min

Gain = 4 to 128

AVDD – 1.1

V max

Common-Mode Voltage, VCM

0.5

V min

VCM = (AIN(+) + AIN(

−))/2, gain = 4 to 128

Analog Input Current

Buffered Mode or In-Amp Active

Average Input Current2

±1

nA max

Gain = 1 or 2, update rate < 100 Hz

±250

pA max

Gain = 4 to 128, update rate < 100 Hz

Average Input Current Drift

±2

pA/°C typ

Unbuffered Mode

Gain = 1 or 2

Average Input Current

±400

nA/V typ

Input current varies with input voltage

Average Input Current Drift

±50

pA/V/°C typ

Normal Mode Rejection2

Internal Clock

@ 50 Hz, 60 Hz

dB min

80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106

@ 50 Hz

dB min

90 dB typ, 50 ± 1 Hz, FS[3:0] = 10016

@ 60 Hz

dB min

100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006

External Clock

@ 50 Hz, 60 Hz

dB min

90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106

@ 50 Hz

dB min

100 dB typ, 50 ± 1 Hz, FS[3:0] = 10016

@ 60 Hz

dB min

100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006

Common-Mode Rejection

@ DC

100

dB min

AIN = 1 V/gain, gain ≥ 4

@ 50 Hz, 60 Hz2

100

dB min

50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106

@ 50 Hz, 60 Hz2

100

dB min

50 ± 1 Hz (FS[3:0] = 1001)6, 60 ± 1 Hz

(FS[3:0] = 1000)6

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