INA110 datasheet(10/22 Pages) TI2

10 / 22 page

INA110

SBOS147A

www.ti.com

negative input exceeds that in the positive input, stray

capacitance from the output will create a net negative feed-

back and improve the circuit stability. If the impedance in

the positive input is greater, the feedback due to stray

capacitance will be positive and instability may result. The

degree of positive feedback depends upon source impedance

imbalance, operating gain, and board layout. The addition of

a small bypass capacitor of 5pF to 50pF directly between the

inputs of the IA will generally eliminate any positive feed-

back. CMR errors due to the input impedance mismatch will

also be reduced by the capacitor.

The INA110 is designed for fast settling with easy gain

selection. It has especially excellent settling in high gain. It

can also be used in fast-settling unity-gain applications. As

with all such amplifiers, the INA110 does exhibit significant

gain peaking when set to a gain of 1. It is, however,

unconditionally stable. The gain peaking can be cancelled

by band-limiting the negative input to 400kHz with a simple

external RC circuit for applications requiring flat response.

CMR is not affected by the addition of the 400kHz RC in a

gain of 1.

Another distinct advantage of the INA110 is the high fre-

quency CMR response. High frequency noise and sharp

common-mode transients will be rejected. To preserve AC

CMR, be sure to minimize stray capacitance on the input

lines. Matching the RCs in the two inputs will help to

maintain high AC CMR.

APPLICATIONS

In addition to general purpose uses, the INA110 is designed

to accurately handle two important and demanding applica-

tions: (1) inputs with high source impedances such as

capacitance/crystal/photodetector sensors and low-pass

filters and series-input protection devices, and (2) rapid-

scanning data acquisition systems requiring fast settling

time. Because the user has access to the output sense, current

sources can also be constructed using a minimum of external

components. Figures 6 through 19 show application circuits.

FIGURE 6. Transformer-Coupled Amplifier.

FIGURE 8. Instrumentation Amplifier with Shield Driver.

X200

INA110

OUT

100

Ω

–15V

+15V

OPA121

∆V

Divider minimizes degredation of CMR due to

distributed capacitance on the input lines.

INA110

OUT

–15V

+15V

X200

Transducer

FIGURE 7. Floating Source Instrumentation Amplifier.

X100

INA110

OUT

Ω

Thermocouple

Transducer or

Other Floating

Source

+15V

–15V

INA110 датащи(PDF) 10 Page - Texas Instruments

INA110 датащи(HTML) 10 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

датащи скачать

ссылки URL