LTC1261CS datasheet(14/16 Pages) LINER

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LTC1261

TYPICAL APPLICATIONS N

This circuit uses the LTC1261CS8 to generate a – 1.24V

output at 20mA. Attached to this output is a 312

Ω resistor

to make the current/voltage conversion. 4mA through

312

Ω generates 1.24V, giving a net 0V output. 20mA

through 312

Ωgives 6.24V across the resistor, giving a net

5V output. If the 4mA to 20mA source requires an operat-

ing voltage greater than 8V, it should be powered from a

separate supply; the LTC1261 can then be powered from

any convenient supply, 3V

≤ VS ≤ 8V. The Schottky diode

prevents the external voltage from damaging the LTC1261

in shutdown or under fault conditions. The LTC1261’s

reference is trimmed to 3.5% and the resistor adds 1%

uncertainty, giving 4.5% total output error.

– 1.24V Generator for 4mA-20mA to 0V-5V Conversion

LTC1261

OUT

ADJ

C1+

C1–

LTC1261 • TA11

3.3

µF

312

Ω

0.1

µF

1N5817

4mA

TO 20mA

SENSOR

OPTIONAL

INPUT

PROTECTION

DIODES

–1.24V

µF

0V TO 5V

±5%

VCC

GND

–

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