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AD7376ARWZ50 Datasheet(PDF) 16 Page - Analog Devices |
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AD7376ARWZ50 Datasheet(HTML) 16 Page - Analog Devices |
16 / 20 page AD7376 Rev. D | Page 16 of 20 APPLICATIONS INFORMATION HIGH VOLTAGE DAC The AD7376 can be configured as a high voltage DAC as high as 30 V. The circuit is shown in Figure 32. The output is 1 2 1 V 2 . 1 128 ) ( R R D D V O (5) Where D is the decimal code from 0 to 127. AD7376 U2 AD8512 V+ V– AD8512 VOUT VDD U1B VDD RBIAS ADR512 D1 R2 R1 B 100kΩ U1A Figure 32. High Voltage DAC PROGRAMMABLE POWER SUPPLY With a boost regulator such as ADP1611, AD7376 can be used as the variable resistor at the regulator’s FB pin to provide the programmable power supply (see Figure 33). The output is 2 128 1 V 23 . 1 R R D V AB O (6) Note that the AD7376’s VDD is derived from the output. Initially L1 acts as a short, and VDD is one diode voltage drop below +5 V. The output slowly establishes to the final value. The AD7376 shutdown sleep-mode programming can be used to program a desirable preset level at power-up. AD7376 ADP1611 1.23V CC 150pF RC 220kΩ COUT 10µF VOUT D1 L1 4.7µF IN GND SS FB RT SW COMP U2 C1 0.1µF VDD R1 100kΩ A W B CIN 10µF 5V R2 8.5kΩ CSS 22nF U1 SD Figure 33. Programmable Power Supply |
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