LTC1655LIN8 datasheet(13/16 Pages) LINER

Teilenummer	LTC1655LIN8

Bauteilbeschribung	16-Bit Rail-to-Rail Micropower DACs in

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Hersteller	LINER [Linear Technology]

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13 / 16 page

LTC1655/LTC1655L

TYPICAL APPLICATIONS

This circuit shows a digitally programmable current source

from an external voltage source using an external op amp,

an LT1218 and an NPN transistor (2N3440). Any digital

word from 0 to 65535 is loaded into the LTC1655 and its

output correspondingly swings from 0V to 4.096V. This

voltage will be forced across the resistor RA. If RA is

chosen to be 412

Ω, the output current will range from

0mA at zero scale to 10mA at full scale. The minimum

voltage for VS is determined by the load resistor RL and

Q1’s VCESAT voltage. With a load resistor of 50Ω, the

voltage source can be 5V.

CLK

DIN

CS/LD

0.1

µF

VCC

VOUT

GND

LTC1655

µP

1655/55L TA04

–

LT1218

5V < VS < 100V

FOR RL ≤ 50Ω

2N3440

412

Ω

IOUT =

≈ 0mA TO 10mA

(DIN)(4.096)

(65536)(RA)

Digitally Programmable Current Source

LTC1655LIN8 Datenblatt(PDF) 13 Page - Linear Technology