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LTC1454CN Datasheet(PDF) 9 Page - Linear Technology |
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LTC1454CN Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1454/LTC1454L Figure 2 APPLICATIONS INFORMATION A Single Supply, 4-Quadrant Multiplying DAC The LTC1454 can also be used for 4-quadrant multiplying with an offset signal ground of 1.22V. This application is shown in Figure 2. The inputs are connected to REFHI B or REFHI A and have a 1.22V amplitude around a signal ground of 1.22V. The outputs will swing from 0V to 2.44V, as shown by the equation with the figure. Since the signal ground is around 1.22V, REFLO is offset above ground by using an LT1034CS8-1.2 as shown. VOUT B VCC REFHI B GND REFLO REFHI A REFOUT VCC VOUT B VOUT A VINB 1.22V ± 1.22V VINA 1.22V ± 1.22V LT1034CS8-1.2 CLK DIN CS/LD LTC1454 1454 F02 X1/X2 B CLR CLK DIN CS/LD DOUT X1/X2 A VOUT A 5V 0.1 µF 10k VOA/B = VIN – VREFLO GAIN – 1 +1 + VREFLO = VIN – 1.22 2.0 – 1.0 + 1.22V () () () () DIN 4096 DIN 4096 |
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