LTC2430IGN datasheet(36/40 Pages) LINER

36 / 40 page

LTC2430/LTC2431

24301f

The circuit shown in Figure 42 shows a more rigorous

example of Figure 41, with increased noise suppression

and more protection for remote applications.

Figure 43 shows an example of gain in the excitation circuit

and remote feedback from the bridge. The LTC1043s

provide voltage multiplication, providing

±10V from a 5V

reference with only 1ppm error. The amplifiers are used at

unity-gain and, hence, introduce a very little error due to

gain error or due to offset voltages. A 1

µV/°Coffsetvoltage

APPLICATIO S I FOR ATIO

drift translates into 0.05ppm/

°C gain error. Simpler alter-

natives, with the amplifiers providing gain using resistor

arrays for feedback, can produce results that are similar to

bridge sensing schemes via attenuators. Note that the

amplifiers must have high open-loop gain or gain error will

be a source of error. The fact that input offset voltage has

relatively little effect on overall error may lead one to use

low performance amplifiers for this application. Note that

the gain of a device such as an LF156, (25V/mV over

350

Ω

BRIDGE

0.1

µF

15V

–15V

10V

15V

LTC1043

–

REF+

REF–

IN+

IN–

GND

VCC

2431 F43

µF

0.1

µF

10V

LTC1043

µF

FILM

LTC1043

–10V

LT1236-5

Ω

2N3904

0.1

µF

15V

–15V

–

Ω

–10V

10V

2N3906

*FLYING CAPACITORS ARE

µF FILM (MKP OR EQUIVALENT)

SEE LTC1043 DATA SHEET FOR

DETAILS ON UNUSED HALF OF U1

LTC1150

Ω

200

Ω

200

Ω

0.1

µF

LTC2430/

LTC2431

Figure 43. LTC1043 Provides Precise 4

× Reference for Excitation Voltages

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