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LM1971 Fiches technique(PDF) 8 Page - Texas Instruments |
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LM1971 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 20 page LM1971 SNAS104B – FEBRUARY 1995 – REVISED APRIL 2013 www.ti.com *Note: Load and clock falling edges can be coincident, however, the clock falling edge cannot be delayed more than 20 ns from the falling edge of load. It is preferrable that the falling edge of clock occurs before the falling edge of load. Figure 15. Timing Diagram Figure 16. Serial Data Format Transfer Process μPOT LADDER ARCHITECTURE The μPot contains a chain of R1/R2 resistor dividers in a ladder form, as shown in Figure 17. Each R1 is actually a series of 8 resistors, with a CMOS switch that taps into the resistor chain according to the attenuation level chosen. For any given attenuation setting, there is only one CMOS switch closed (no paralleling of ladders). The input impedance therefore remains constant, while the output impedance changes as the attenuation level changes. It is important to note that the architecture is a series of resistor dividers, and not a straight, tapped resistor, so the μPot is not a variable resistor; it is a variable voltage divider. Figure 17. Resistor Ladder Architecture 8 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1971 |
Numéro de pièce similaire - LM1971_14 |
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Description similaire - LM1971_14 |
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