Datasheet

LM1972
SNAS094D –APRIL 1995–REVISED MARCH 2013 www.ti.com
APPLICATION INFORMATION
ATTENUATION STEP SCHEME
The fundamental attenuation step scheme for the LM1972 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 1dB steps for a panning function as
shown in Figure 17. 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 LM1972 can be configured as a panning control which
separates the mono signal into left and right channels. This circuit may utilize the fundamental attenuation
scheme of the LM1972 or be programmed to provide a constant 1dB logarithmic attenuation scheme as shown in
Figure 17.
LM1972 Channel Attenuation
vs Digital Step Value
Figure 16. LM1972 Attenuation Step Scheme
LM1972 Channel Attenuation
vs Digital Step Value
(Programmed 1.0dB Steps)
Figure 17. LM1972 1.0dB
Attenuation Step Scheme
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