(VRS+ = VRS- = +76V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C, unless otherwise noted. Typical values are

at TA =+25°C.) (Note 2)

Note 2: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.

Note 3: Specifications are guaranteed by design, not production tested.

Note 4: Gain and offset voltage are calculated based on two point measurements: VSENSE1 and VSENSE2.

VSENSE1 = 20% x Full Scale VSENSE. VSENSE2 = 80% x Full Scale VSENSE.

Note 5: Output is high-Z during power-up.

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Sense Voltage

VSENSE

MAX44285L (G = 12.5V/V)

200

mV

MAX44285T (G = 20V/V)

125

MAX44285F (G = 50V/V)

50

MAX44285H (G = 100V/V)

25

Gain (Note 4)

G

Full-scale VSENSE = 200mV

12.5

V/V

Full-scale VSENSE = 125mV

20

Full-scale VSENSE = 50mV

50

Full-scale VSENSE = 25mV

100

Gain Error (Note 3)

GE

TA = +25°C

0.1

%

-40°C ≤ TA ≤ +85°C

0.3

-40°C ≤ TA ≤ +125°C

0.5

Output Resistance

ROUT

0.1

mΩ

Output Low Voltage

VOL

Sink 500µA

15

mV

No load

4

Output High Voltage

VOH

Source 500µA

VDD -

0.015

V

AC CHARACTERISTICS

Signal Bandwidth

BW -3dB

All gain configurations VSENSE > 5mV

80

kHz

AC Power-Supply

Rejection Ratio

AC PSRR

f = 200kHz

40

dB

AC CMRR

AC CMRR

f = 200kHz

1mV sine wave

54

dB

20mV sine wave

47

Output Transient Recovery

Time

∆VOUT = 2VP-P, 14-bit settling with 400Ω

and 1nF, 6nF ADC sampling capacitor

2

µs

Capacitive Load Stability

CLOAD

With 250Ω isolation resistor

20

nF

Without any isolation resistor

200

pF

Input Voltage-Noise

Density

en

f = 1kHz

45

nV/√

Hz

Total Harmonic Distortion

(Up to 7th Harmonics)

THD

f = 1kHz, VOUT = 1VP-P

63

dB

Power-Up Time (Note 5)

200

µs

Saturation Recovery Time

10

µs

MAX44285

Dual-Channel, High-Precision,

High-Voltage, Current-Sense Amplifier

www.maximintegrated.com

Maxim Integrated │ 3

Electrical Characteristics (continued)