AD7787 Просмотр технического описания (PDF) - Analog Devices

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AD7787

Low Power, 2-Channel 24-Bit Sigma-Delta ADC

Analog Devices 

AD7787

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

ADC CHANNEL SPECIFICATION

Output Update Rate

ADC CHANNEL

No Missing Codes1

Resolution

Output Noise

Integral Nonlinearity

Offset Error

Offset Error Drift vs. Temperature

Full-Scale Error2

Gain Drift vs. Temperature

Power Supply Rejection

ANALOG INPUTS

Bipolar Input Voltage Range

Unipolar Voltage Range

Absolute AIN Voltage Limits1

Analog Input Current

Average Input Current1

Average Input Current Drift

Absolute AIN Voltage Limits1, 3

Analog Input Current

Average Input Current

Average Input Current Drift

Normal Mode Rejection1

@ 50 Hz, 60 Hz

@ 50 Hz

@ 60 Hz

Common-Mode Rejection (AIN1)

@ DC

@ 50 Hz, 60 Hz1

REFERENCE INPUT

REFIN Voltage

Reference Voltage Range1

Average Reference Input Current

Average Reference Input Current Drift

Normal Mode Rejection1

@ 50 Hz, 60 Hz

@ 50 Hz

@ 60 Hz

AD7787B

Unit

Test Conditions/Comments

9.5

Hz min nom

120

Hz max nom

24

Bits min

Update rate ≤ 20 Hz.

19.5

Bits p-p

9.5 Hz update rate.

1.1

µV rms typ

±15

ppm of FSR max 3.5 ppm typ.

±3

µV typ

±10

nV/°C typ

±10

µV typ

±0.5

ppm/°C typ

90

dB min

100 dB typ, AIN = 1 V.

±REFIN

V nom

0 to REFIN

GND + 100 mV

VDD – 100 mV

V nom

V min

V max

±1

±5

GND – 100 mV

VDD + 30 mV

nA max

pA/°C typ

V min

V max

±400

±50

nA/V typ

pA/V/°C typ

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

voltage of 100 mV minimum (see Page 18).

Buffered mode.

Buffered mode.

Unbuffered mode.

Unbuffered mode. Current varies with input voltage.

65

dB min

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

80

dB min

90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014.

80

dB min

90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114.

AIN = 1 V.

90

dB min

100 dB typ.

100

dB min

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

2.5

0.1

VDD

0.5

±0.03

V nom

V min

V max

µA/V typ

nA/V/°C typ

65

dB min

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

80

dB min

90 dB typ, 50 ± 1 Hz, FS[2:0] = 1014.

80

dB min

90 dB typ, 60 ± 1 Hz, FS[2:0] = 0114.

Rev. 0 | Page 3 of 20

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