MAX9934FART+T datasheet(13/19 Pages) AD

13 / 19 page

MAX9934

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

with Current Output and Chip Select for Multiplexing

Maxim Integrated

In Figure 5, VOUT is equal to VBIAS when the sum of all

outputs is zero. For positive input-sense voltages, the

MAX9934 sources current causing its output voltage to

rise above VBIAS. For negative input-sense voltages,

the MAX9934 sinks current causing its output voltage to

be lower than VBIAS, thus allowing bidirectional current

sensing.

Since the ADC reference voltage, VREF, determines the

full-scale reading, a common choice for VBIAS is

VREF/2. The current output makes it possible to use a

simple resistor-divider from VREF to GND to generate

VBIAS. The output resistance for gain calculation is the

parallel combination of the two resistors. For example, if

two equal value resistors, R, are used to generate a

VBIAS = VREF/2, the output termination resistance for

gain calculation is ROUT = R/2. See Figure 5.

VCC = 3.3V

RSENSE

-0.1V

≤ VCM ≤ 5.5V

RSENSE

-0.1V

≤ VCM ≤ 5.5V

RSENSE

-0.1V

≤ VCM ≤ 5.5V

MAX9934

10k

Ω

ADC

VREF

CS2

CS1

MICROCONTROLLER

TO EXTERNAL

REFERENCE

VOLTAGE

10k

Ω

CS3

(OPTIONAL)

VIN1

VIN2

VIN3

ILOAD3

ILOAD2

ILOAD1

VOUT

OUT3

OUT2

OUT1

ROUT =

Figure 5. Bidirectional Multiplexed Operation

MAX9934FART+T Datasheet(PDF) 13 Page - Analog Devices

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