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LM1971MX Datenblatt(PDF) 8 Page - Texas Instruments

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Teilenummer LM1971MX
Bauteilbeschribung  LM1971 Overture Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator
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LM1971MX Datenblatt(HTML) 8 Page - Texas Instruments

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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
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