INA333 datasheet(14/23 Pages) TI

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GENERAL LAYOUT GUIDELINES

300W

+3V

150W

(1)

- D

2V+ V

INA333

Ref

1.5V

INPUT PROTECTION

APPLICATION IDEAS

INA333

R /2

10kW

Ref

G=10

2.8kW

1/2

OPA2333

390kW

1/2

OPA2333

INA333

SBOS445 – JULY 2008 ...................................................................................................................................................................................................... www.ti.com

Attention

good

layout

practices

always

recommended.

Keep

traces

short

and,

when

possible, use a printed circuit board (PCB) ground

plane with surface-mount components placed as

close to the device pins as possible. Place a 0.1

µF

bypass capacitor closely across the supply pins.

These guidelines should be applied throughout the

analog circuit to improve performance and provide

benefits

such

reducing

the

electromagnetic-interference (EMI) susceptibility.

(1) R1 creates proper common-mode voltage, only for low-voltage

Instrumentation amplifiers vary in the susceptibility to

operation—see the Single-Supply Operation section.

radio-frequency interference (RFI). RFI can generally

be identified as a variation in offset voltage or dc

Figure 35. Single-Supply Bridge Amplifier

signal levels with changes in the interfering RF signal.

The INA333 has been specifically designed to

minimize susceptibility to RFI by incorporating RFI

filters at the VIN+ and VIN– inputs. As a result, the

The input terminals of the INA333 are protected with

INA333

demonstrates

remarkably

low

sensitivity

internal diodes connected to the power-supply rails.

compared to previous generation devices. Strong RF

These diodes clamp the applied signal to prevent it

fields may continue to cause varying offset levels,

from damaging the input circuitry. If the input signal

however, and may require additional shielding.

voltage can exceed the power supplies by more than

0.3V, the input signal current should be limited to less

than 10mA to protect the internal clamp diodes. This

current limiting can generally be done with a series

Additional application ideas are shown in Figure 36 to

input resistor. Some signal sources are inherently

Figure 39.

current-limited and do not require limiting resistors.

Figure 36. ECG Amplifier With Right-Leg Drive

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