AD8218 查看數據表（PDF） - Analog Devices

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AD8218

Zero Drift, Bidirectional Current Shunt Monitor

Analog Devices 

Data Sheet

AD8218

SPECIFICATIONS

TOPR = −40°C to +125°C, TA = 25°C, RL = 25 kΩ (RL is the output load resistor), input common-mode voltage (VCM) = 4 V, unless

otherwise noted.

Table 1.

Parameter

GAIN

Initial

Accuracy

Accuracy over Temperature

Gain vs. Temperature

VOLTAGE OFFSET

Offset Voltage (RTI1)

Over Temperature (RTI1)

Offset Drift

INPUT

Bias Current2

Common-Mode Input Voltage Range

Differential Input Voltage Range3

Common-Mode Rejection (CMRR)

OUTPUT

Output Voltage Range Low

Output Voltage Range High

Output Impedance

INTERNAL REFERENCE (ENB PIN CONNECTED TO GND)

Initial Value

Offset (RTI1)

Offset Drift (RTO4)

REFERENCE INPUT (REF, PIN 7)

Input Impedance

Input Current

Input Voltage Range

Input-to-Output Gain

DYNAMIC RESPONSE

Small-Signal −3 dB Bandwidth

Slew Rate

NOISE

0.1 Hz to 10 Hz (RTI1)

Spectral Density, 1 kHz (RTI1)

POWER SUPPLY

Operating Range (Pin 2 Floating)

VS Range (Pin 2)

Quiescent Current over Temperature

Power Supply Rejection Ratio (PSRR)

TEMPERATURE RANGE

For Specified Performance

Min Typ

Max

Unit

Test Conditions/Comments

20

V/V

±0.1

%

VO ≥ 0.1 V dc, TA

±0.35 %

TOPR

±5

ppm/°C TOPR

±100

±200

±300

µV

µV

nV/°C

25°C

TOPR

TOPR

130

4

0

90

110

µA

TA, input common mode = 4 V, VS = 4 V

220

µA

TOPR, input common mode = 4 V, VS = 4 V

80

V

Common-mode continuous

250

mV

Differential input voltage

dB

TOPR

0.01

2

V

VS − 0.1 V

TA

Ω

80

−150

±10

+150

mV

µV

µV/°C

Voltage at OUT with a differential input of

0 V and a common-mode input of 4 V

VS = NC or VS = 5 V

1.5

MΩ

3

60

µA

Dependent on VREF/1.5 MΩ

0

5

V

ENB not connected to GND

1 ± 0.0001

V/V

450

kHz

1

V/µs

2.3

µV p-p

110

nV/√Hz

4

4

90

110

80

V

5.5

V

800

µA

dB

Power regulated from common mode,

VS pin floating

VS must be less than 5.5 V if standalone

supply is used

Throughout input common mode

TOPR

−40

+125

°C

1 RTI = referred to input.

2 Refer to Figure 9 for more information on the input bias current. This current varies based on the input common-mode voltage. The input bias current flowing to the

+IN pin is also the supply current to the internal LDO.

3 The differential input voltage is specified as 250 mV because the output is internally clamped to 5.2 V. This ensures that the output voltage does not exceed the typical

ADC input range, preventing damage. The AD8218 can survive up to ±5 V differentially but will only amplify ~250 mV correctly due to the output clamping function.

4 RTO = referred to output.

Rev. B | Page 3 of 16

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