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X9317UV8-2.7 Datasheet(PDF) 11 Page - Intersil Corporation |
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X9317UV8-2.7 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 15 page 11 FN8183.1 September 9, 2005 Applications Information Electronic digitally controlled (XDCP) potentiometers provide three powerful application advantages; (1) the variability and reliability of a solid-state potentiometer, (2) the flexibility of computer-based digital controls, and (3) the retentivity of nonvolatile memory used for the storage of multiple potentiometer settings or data. Basic Configurations of Electronic Potentiometers Basic Circuits VREF RW VREF I Three terminal potentiometer; variable voltage divider Two terminal variable resistor; variable current RH RL Cascading Techniques Buffered Reference Voltage - + +5V R1 +V VREF VOUT LMC7101 RW RW +V +V +V X (a) (b) VOUT = VW/RW Single Supply Inverting Amplifier Voltage Regulator R1 R2 Iadj VO (REG) = 1.25V (1+R2/R1)+Iadj R2 VO (REG) VIN 317 Offset Voltage Adjustment + - VS VO R2 R1 100k Ω 10k Ω 10k Ω 10k Ω +5V LMC7101 Comparator with Hysteresis VUL = {R1/(R1+R2)} VO(max) VLL = {R1/(R1+R2)} VO(min) + - R1 VO LMC7101 + - VS VO R2 R1 LT311A (for additional circuits see AN115) +5V R2 +5V 100K 100K +5V VS VO = (R2/R1)VS RW X9317 |
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