LTC2410IGN datasheet(36/44 Pages) LINER

36 / 44 page

LTC2410

APPLICATIO S I FOR ATIO

The error associated with the 10V excitation would be

–80ppm. Hence, overall reference error could be as high

as 130ppm, the average of the two.

Figure 52 shows a similar scheme to provide excitation

using resistor arrays to produce precise gain. The circuit

is configured to provide 10V and –5V excitation to the

bridge, producing a common mode voltage at the input to

the LTC2410 of 2.5V, maximizing the AC input range for

applications where induced 60Hz could reach amplitudes

up to 2VRMS.

The last two example circuits could be used where mul-

tiple bridge circuits are involved and bridge output can be

multiplexed onto a single LTC2410, via an inexpensive

multiplexer such as the 74HC4052.

Figure 53 shows the use of an LTC2410 with a differential

multiplexer. This is an inexpensive multiplexer that will

contribute some error due to leakage if used directly with

the output from the bridge, or if resistors are inserted as

a protection mechanism from overvoltage. Although the

bridge output may be within the input range of the A/D and

multiplexer in normal operation, some thought should be

given to fault conditions that could result in full excitation

voltage at the inputs to the multiplexer or ADC. The use of

amplification prior to the multiplexer will largely eliminate

errors associated with channel leakage developing error

voltages in the source impedance.

Figure 50. Remote Half Bridge Sensing with Noise Suppression on Reference

Figure 49. Remote Half Bridge Interface

2410 F49

REF+

REF–

IN+

IN–

GND

VCC

2.7V TO 5.5V

PLATINUM

100

Ω

RTD

25.5k

0.1%

1, 7, 8, 9,

10, 15, 16

LTC2410

REF+

REF–

IN–

GND

VCC

2410 F50

1, 7, 8, 9,

10, 15, 16

LTC2410

–

LTC1050

PLATINUM

100

Ω

RTD

560

Ω

10k

10k, 5%

10k

0.1%

µF

IN+

10k

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