Datasheet

LM1973
www.ti.com SNAS093B –DECEMBER 1994–REVISED MARCH 2013
APPLICATION INFORMATION
ATTENUATION STEP SCHEME
The fundamental attenuation step scheme for the LM1973 μPot is shown in Figure 16. This attenuation step
scheme, however, can be changed through programming techniques to fit different application requirements.
One such example would be a constant logarithmic attenuation scheme of 2dB steps for a panning function as
shown in Figure 18. The only restriction to the customization of attenuation schemes are the given attenuation
levels and their corresponding data bits shown in Table 1. The device will change attenuation levels only when a
channel address is recognized. When recognized, the attenuation level will be changed corresponding to the
data bits shown in Table 1. As shown in Figure 19, an LM1973 can be configured with a mono audio signal level
control and with a panning control which separates the mono signal into left and right channels. This circuit may
utilize the fundamental attenuation scheme of the LM1973 for the level control, but also possess a constant 2dB
panning control for the left and right channels as stated earlier.
LM1973 Channel Attenuation
vs Digital Step Value
Figure 16.
LM1973 Channel Attenuation
vs Digital Step Value
(Programmed 1.0dB Steps)
Figure 17. LM1973 1.0dB and 2.0dB
Attenuation Step Scheme
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