INA333_3 datasheet(14/25 Pages) TI

14 / 25 page

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

SBOS445B – JULY 2008 – REVISED OCTOBER 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

RFI

incorporating

passive RC filters with an 8MHz corner frequency at

The input terminals of the INA333 are protected with

the VIN+ and VIN– inputs. As a result, the INA333

internal diodes connected to the power-supply rails.

demonstrates remarkably low sensitivity compared to

These diodes clamp the applied signal to prevent it

previous generation devices. Strong RF fields may

from damaging the input circuitry. If the input signal

continue to cause varying offset levels, however, and

voltage can exceed the power supplies by more than

may require additional shielding.

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

input resistor. Some signal sources are inherently

Additional application ideas are shown in Figure 36 to

current-limited and do not require limiting resistors.

Figure 39.

Figure 36. ECG Amplifier With Right-Leg Drive

Submit Documentation Feedback

Product Folder Link(s): INA333

INA333 датащи(PDF) 14 Page - Texas Instruments

INA333 датащи(HTML) 14 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

датащи скачать

ссылки URL