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LTC1451

LTC1452/LTC1453

sn145123 145123fas

12-Bit 3V to 5V Voltage Output DAC

DIN

CLK

CS/LD

DOUT

µP

0.1

µF

OUTPUT

LTC1451: 0V TO 4.095V

LTC1452: 0V TO 2 • REF

LTC1453: 0V TO 2.5V

LTC1451: 2.048V

LTC1452: EXTERNAL

LTC1453: 1.22V

VCC

VOUT

GND

LTC145X

VREF

TO NEXT DAC FOR

DAISY-CHAINING

LTC1451: 4.5V TO 5.5V

LTC1452: 2.7V TO 5.5V

LTC1453: 2.7V TO 5.5V

1451/2/3 TA03

Digitally Programmable Current Source

CLK

DIN

CS/LD

µP

0.1

µF

VCC

VOUT

GND

LTC1451

1451/2/3 TA05

–

LT1077

VS + 5V TO 100V

FOR RL ≤ 50Ω

2N3440

410

Ω

IOUT =

≈ 0mA TO 10mA

DIN • 4.095

4096 • RA

This circuit shows a digitally programmable current source

from an external voltage source using an external op amp,

an LT1077 and an NPN transistor (2N3440). Any digital

word from 0 to 4095 is loaded into the LTC1451 and its

output correspondingly swings from 0V to 4.095V. In the

configuration shown, this voltage will be forced across the

resistor RA. If RA is chosen to be 410Ω 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 50

Ω, the voltage source can be as low as 5V.

TYPICAL APPLICATIO S

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