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LTC1655IN8 Datasheet(PDF) 9 Page - Linear Technology |
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LTC1655IN8 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1655 A Wide Swing, Bipolar Output 16-Bit DAC TYPICAL APPLICATIONS This circuit shows how to make a bipolar output 16-bit DAC with a wide output swing using an LTC1655 and an LT1077. R1 and R2 resistively divide down the LTC1655 output and an offset is summed in using the LTC1655 onboard 2.048V reference and R3 and R4. R5 ensures that the onboard reference is always sourcing current and never has to sink any current even when VOUT is at full scale. The LT1077 output will have a wide bipolar output swing of – 4.096V to 4.096V as shown in the figure below. With this output swing 1LSB = 125 µV. CLK DIN CS/LD µP 0.1 µF VCC VOUT GND VREF R1 100k 1% 5V LTC1655 1655 TA05 – + LT1077 5V –5V R2 200k 1% R3 100k 1% R5 100k 1% R4 200k 1% (2)(DIN)(4.096) 65536 VOUT: DIN VOUT 4.096 – 4.096 32768 0 65535 TRANSFER CURVE – 4.096V |
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