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LM1972 Datasheet(Fiches technique) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Numéro de pièce LM1972
Description  Pot 2-Channel 78dB Audio Attenuator with Mute
Télécharger  11 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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 5 page
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Typical Performance Characteristics (Continued)
Application Information
ATTENUATION STEP SCHEME
The fundamental attenuation step scheme for the LM1972
µPot is shown in
Figure 3. 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 4. 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 corre-
sponding to the data bits shown in
Table 1. As shown in Fig-
ure 6, 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 4.
THD+Nvs Amplitude
DS011978-24
THD+Nvs Amplitude
DS011978-25
THD+Nvs Amplitude
DS011978-26
LM1972 Channel Attenuation
vs Digital Step Value
DS011978-6
FIGURE 3. LM1972 Attenuation Step Scheme
LM1972 Channel Attenuation
vs Digital Step Value
(Programmed 1.0dB Steps)
DS011978-7
FIGURE 4. LM1972 1.0dB
Attenuation Step Scheme
LM1972 Channel Attenuation
vs Digital Step Value
(Programmed 2.0dB Steps)
DS011978-8
FIGURE 5. LM1972 2.0dB Attenuation Step Scheme
www.national.com
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