LTC1261C(RevA) View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1261C
(Rev.:RevA)

Switched Capacitor Regulated Voltage Inverter

Linear Technology 

LTC1261

TYPICAL APPLICATIONS N

This circuit uses the LTC1261CS8 to generate a – 1.24V

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

to make the current/voltage conversion. 4mA through

312Ω generates 1.24V, giving a net 0V output. 20mA

through 312Ω gives 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

4mA

TO 20mA

SENSOR

OPTIONAL

INPUT

PROTECTION

DIODES

+

–

–1.24V

8V

1µF

312Ω

1

1%

6

VCC

OUT

C1+

2

0V TO 5V

±5%

+ 3.3µF

LTC1261

0.1µF

1N5817

5

ADJ

C1– 3

GND

4

LTC1261 • TA11

14

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