MAX49921 datasheet(4/14 Pages) MAXIM

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Electrical Characteristics (VDD = 5V)

(VRS+ = VRS- = +50V, VDD = +5V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C, unless otherwise noted. Typical values are

at TA = +25°C. (Note 1) )

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER-SUPPLY CHARACTERISTICS

Supply Voltage

VDD

Guaranteed by PSRR

2.7

5.5

Supply Current

IDD

No loads

0.7

Power-Up Time (Note 2)

tPWR_UP

Output settles to 1%

200

µs

CURRENT-SENSE AMPLIFIER / DC CHARACTERISTICS

Input-Protected

Common-Mode Range

VCM_P

(Note 3)

-42

+80

Input Common-Mode

Range

VCM

Guaranteed by CMRR

+70

Input Bias Current

IRS+ , IRS-

(Note 3)

0.1

μA

Input Offset Current

IRS+ - IRS-

(Note 3)

0.1

µA

Input Leakage Current

IRS+, IRS-

VDD = 0V, VRS± = 70V (Note 3)

0.1

μA

Input Offset Voltage

VOS

G = 20V/V

TA = +25ºC

±0.5

±30

μV

-40ºC ≤ TA ≤ +85ºC

±50

-40ºC ≤ TA ≤

+125ºC

±60

G = 50V/V

TA = +25°C

±0.5

±12

-40°C ≤ TA ≤

+85°C

±20

-40°C ≤ TA ≤

+125°C

±50

Input Offset Voltage Drift

TCVOS

380

nV/°C

Power-Supply Rejection

Ratio

PSRR

2.7V ≤ VDD ≤ 5.5V

108

Common-Mode

Rejection Ratio

CMRR

0 ≤ VCM ≤ +70V

-40°C ≤ TA ≤

+85°C

130

140

-40°C ≤ TA ≤

+125°C

125

140

Input Capacitance

CIN

RS+, RS- input

Input Sense Voltage

VSENSE

G = 20V/V (MAX49921T)

100

G = 50V/V (MAX49921F)

Gain

Full-scale (FS) VSENSE = 100mV

(MAX49921T)

V/V

FS VSENSE = 90mV (MAX49921F)

Gain Error (Note 4)

TA = +25°C

±0.05

±0.1

-40°C ≤ TA ≤ +85°C

±0.15

-40°C ≤ TA ≤ +125°C

±0.2

Nonlinearlity Error

10mV ≤ VSENSE ≤ 95mV

0.1

Output Resistance

ROUT

VOUT = VDD/2, IOUT = ±500μA

0.2

Output Voltage Swing

High

VOH

Source 500μA

VDD -

0.015

MAX49921

0 to 70V, High-Precision Current-Sense Amplifier

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