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LTC1451IN8 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1451IN8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1451 LTC1452/LTC1453 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 5V LTC1451 1451/2/3 TA05 – + LT1077 VS + 5V TO 100V FOR RL ≤ 50Ω Q1 2N3440 RA 410 Ω RL 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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