MAX9934

High-Precision, Low-Voltage, Current-Sense Amplifier

with Current Output and Chip Select for Multiplexing

3

Maxim Integrated

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

MAX9934T

25

Current Gain (Transconductance)

GM

MAX9934F

5

µA/mV

TA = +25°C

±0.25

MAX9934T

-40°C

≤ TA ≤ +125°C

±2.0

TA = +25°C

±0.25

Current Gain Error

(Note 4)

GME

MAX9934F

-40°C

≤ TA ≤ +125°C

±2.4

%

MAX9934T

±200

Gain Error Drift

GME/dT

MAX9934F

±240

ppm/°C

Input-Bias Current for RS+

IBRS+

VRS+ = VRS- = 5.5V

0.1

100

nA

VRS+ = VRS-

≤ VCC - 0.2V

0.1

100

nA

Input-Bias Current for RS-

IBRS-

VRS+ = VRS- = 5.5V

35

60

µA

Input Leakage Current

ILEK

VCC = 0V, VRS+ = VRS- = 5.5V

0.1

100

nA

DC CHARACTERISTICS

Minimum Current for Output Low

IOL

Unidirectional, VOL = IOL x ROUT

1

100

nA

VOH

IOUT = +600µA, VOH = VCC - VOUT

0.1

0.25

Output-Voltage Range

(MAX9934T)

VOL

IOUT = -600µA, bidirectional

0.15

0.25

V

VOH

IOUT = +375µA, VOH = VCC - VOUT

0.18

0.30

Output-Voltage Range

(MAX9934F)

VOL

IOUT = -375µA, bidirectional

0.18

0.26

V

Deselected Amplifier Output

Leakage

IOLK

VCS = 0V, VOUT = 3.6V,

and 0

≤ VCC ≤ 3.6V

0.1

100

nA

LOGIC I/O (CS)

Input Voltage Low CS

VIL

0.54

V

Input Voltage High CS

VIH

1.26

V

Input Current CS

IIL,IIH

0

≤ VCS ≤ VCC

0.1

100

nA

POWER SUPPLY

Supply-Voltage Range

VCC

Guaranteed by PSRR

2.5

3.6

V

Power-Supply Rejection Ratio

PSRR

2.5V

≤ VCC ≤ 3.6V,

VRS+ = VRS- = 2V (Note 3)

110

120

dB

Supply Current

ICC

VCC = 3.3V, ROUT = 10k

Ω to 3.3V,

VRS+ = VRS- = 3.1V

120

230

µA

Supply Current, Output

Deselected

ICC,DES

VCS = 0V, ROUT = 10k

Ω to 3.3V,

VRS+ = VRS- = 3.1V

120

210

µA

AC CHARACTERISTICS (CL = 1000pF)

MAX9934T

GM = 25µA/mV, VSENSE = 5mV

1.5

Amplifier Bandwidth

BW

MAX9934F

GM = 5µA/mV, VSENSE = 25mV

5

kHz

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 3.3V, VRS+ = VRS- = 3.0V, VSENSE = 0V, VCM = (VRS+ + VRS-)/2, VCS = 3.3V, ROUT = 10kΩ to GND for unidirectional opera-

tion, ROUT = 10kΩ to VCC/2 for bidirectional operation. TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA =

+25°C.) (Note 2)