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LTC1458LC Datasheet(PDF) 9 Page - Linear Technology |
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LTC1458LC Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page 9 LTC1458/LTC1458L APPLICATIONS INFORMATION Using Two DACs to Digitally Program the Full Scale and Offset of a Third Figure 2 shows how to use one LTC1458 to make a 12-bit DAC with a digitally programmable full scale and offset. DAC A and DAC B are used to control the offset and full scale of DAC C. DAC A is connected in a ×1 configuration and controls the offset of DAC C by moving REFLO C above ground. The minimum value to which this offset can be programmed is 10mV. DAC B is connected in a × 2 configuration and controls the full scale of DAC C by driving REFHI C. Note that the voltage at REFHI C must be less than or equal to VCC/2, corresponding to DAC B’s code ≤ 2,500 for VCC = 5V, since DAC C is being operated in × 2 mode for full rail-to-rail output swing. The transfer characteristic is: VOUTC = 2 • [DC • (2 • DB – DA) + DA] • REFOUT where REFOUT = The Reference Output DA = (DAC A Digital Code)/4096 This sets the offset. DB = (DAC B Digital Code)/4096 This sets the full scale. DC = (DAC C Digital Code)/4096 VCC X1/X2 B VOUT B CLR REFHI B GND REFLO B REFLO A REFHI A REFOUT NC VOUT A X1/X2 A VCC X1/X2 C VOUT C CS/LD DIN REFHI C GND REFLO C REFLO D REFHI D DOUT CLK NC VOUT D X1/X2 D LTC1458 LTC1458L 0.1 µF VOUT 5V 1458 F02 500 Ω Figure 2 |
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