INA333 datasheet(13/26 Pages) TI1

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OPERATING VOLTAGE

LOW VOLTAGE OPERATION

SINGLE-SUPPLY OPERATION

INA333

47kW

INA333

10kW

Microphone,

Hydrophone,

etc.

Thermocouple

INA333

Centertapprovides

biascurrentreturn.

INPUT COMMON-MODE RANGE

INA333

www.ti.com ..................................................................................................................................................... SBOS445B – JULY 2008 – REVISED OCTOBER 2008

The INA333 operates over a power-supply range of

+1.8V to +5.5V (±0.9V to ±2.75V). Supply voltages

higher

than

+7V

(absolute

maximum)

can

permanently damage the device. Parameters that

vary over supply voltage or temperature are shown in

the Typical Characteristics section of this data sheet.

The INA333 can be operated on power supplies as

low as ±0.9V. Most parameters vary only slightly

throughout this supply voltage range—see the Typical

Characteristics section. Operation at very low supply

voltage requires careful attention to assure that the

input voltages remain within the linear range. Voltage

swing requirements of internal nodes limit the input

common-mode range with low power-supply voltage.

The

Typical

Characteristic

curves

Typical

Common-Mode Range vs Output Voltage (Figure 20

to Figure 23) show the range of linear operation for

various supply voltages and gains.

The INA333 can be used on single power supplies of

+1.8V

+5.5V.

Figure

illustrates

basic

Figure 34. Providing an Input Common-Mode

single-supply circuit. The output REF terminal is

Current Path

connected to mid-supply. Zero differential input

voltage demands an output voltage of mid-supply.

Actual

output

voltage

swing

limited

approximately 50mV above ground, when the load is

referred

ground

shown.

The

typical

The linear input voltage range of the input circuitry of

characteristic curve Output Voltage Swing vs Output

the INA333 is from approximately 0.1V below the

Current (Figure 29) shows how the output voltage

positive supply voltage to 0.1V above the negative

swing varies with output current.

supply. As a differential input voltage causes the

output voltage to increase, however, the linear input

With single-supply operation, VIN+ and VIN– must both

range is limited by the output voltage swing of

be 0.1V above ground for linear operation. For

amplifiers A1 and A2. Thus, the linear common-mode

instance, the inverting input cannot be connected to

input range is related to the output voltage of the

ground to measure a voltage connected to the

complete amplifier. This behavior also depends on

noninverting input.

supply voltage—see Typical Characteristic curves

Typical Common-Mode Range vs Output Voltage

illustrate

the

issues

affecting

low

voltage

(Figure 20 to Figure 23).

operation, consider the circuit in Figure 35. It shows

the INA333 operating from a single 3V supply. A

Input overload conditions can produce an output

resistor in series with the low side of the bridge

voltage that appears normal. For example, if an input

assures that the bridge output voltage is within the

overload condition drives both input amplifiers to the

common-mode range of the amplifier inputs.

respective positive output swing limit, the difference

voltage measured by the output amplifier is near

zero. The output of the INA333 is near 0V even

though both inputs are overloaded.

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