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Data Sheet

AD7787

Rev. A | Page 3 of 20

SPECIFICATIONS

Temperature range is −40°C to +105°C. VDD = 2.5 V to 5.25 V; REFIN = 2.5 V; GND = 0 V; CDIV1 = CDIV0 = 0; all specifications TMIN to

TMAX, unless otherwise noted.

Table 1.

Parameter

AD7787B

Unit

Test Conditions/Comments

ADC CHANNEL SPECIFICATION

Output Update Rate

9.5

Hz min nom

120

Hz max nom

ADC CHANNEL

No Missing Codes1

Bits min

Update rate ≤ 20 Hz.

Resolution

19.5

Bits p-p

9.5 Hz update rate.

Output Noise

1.1

µV rms typ

Integral Nonlinearity

±15

ppm of FSR max

3.5 ppm typ.

Offset Error

±3

µV typ

Offset Error Drift vs. Temperature

±10

nV/°C typ

Full-Scale Error2

±10

µV typ

Gain Drift vs. Temperature

±0.5

ppm/°C typ

Power Supply Rejection

dB min

100 dB typ, AIN = 1 V.

ANALOG INPUTS

Bipolar Input Voltage Range

±REFIN

V nom

Because AIN2 is single-ended, it can have a negative

voltage of 100 mV minimum (see Page 18).

Unipolar Voltage Range

0 to REFIN

V nom

Absolute AIN Voltage Limits1

GND + 100 mV

V min

Buffered mode.

VDD – 100 mV

V max

Analog Input Current

Buffered mode.

Average Input Current1

±1

nA max

Average Input Current Drift

±5

pA/°C typ

Absolute AIN Voltage Limits1, 3

GND – 100 mV

V min

Unbuffered mode.

VDD + 30 mV

V max

Analog Input Current

Unbuffered mode. Current varies with input voltage.

Average Input Current

±400

nA/V typ

Average Input Current Drift

±50

pA/V/°C typ

Normal Mode Rejection1

@ 50 Hz, 60 Hz

dB min

73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004.

@ 50 Hz

dB min

90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014.

@ 60 Hz

dB min

90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114.

Common-Mode Rejection (AIN1)

AIN = 1 V.

@ DC

dB min

100 dB typ.

@ 50 Hz, 60 Hz1

100

dB min

50 ± 1 Hz (FS[2:0] = 1014), 60 ± 1 Hz (FS[2:0] = 0114).

REFERENCE INPUT

REFIN Voltage

2.5

V nom

Reference Voltage Range1

0.1

V min

VDD

V max

Average Reference Input Current

0.5

µA/V typ

Average Reference Input Current Drift

±0.03

nA/V/°C typ

Normal Mode Rejection1

@ 50 Hz, 60 Hz

dB min

73 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[2:0] = 1004.

@ 50 Hz

dB min

90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014.

@ 60 Hz

dB min

90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114.

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