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LM1973 Datasheet(Fiches technique) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM1973
Description  μPot™3-Channel 76dB 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 LM1973
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 2dB
steps for a panning function as shown in
Figure 5. 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 LM1973 can be configured with a mono audio sig-
nal 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 pan-
ning control for the left and right channels as stated earlier.
THD+Nvs Amplitude
f = 20 Hz, V
DD = ±6V
V
IN into CH1 @ 0dB
DS011958-25
THD+Nvs Amplitude
f = 1 kHz, V
DD = ±6V
V
IN into CH1 @ 0dB
DS011958-26
THD+Nvs Amplitude
f = 20 kHz, V
DD = ±6V
V
IN into CH1 @ 0dB
DS011958-27
LM1973 Channel Attenuation
vs Digital Step Value
DS011958-7
FIGURE 3. LM1973 Attenuation Step Scheme
LM1973 Channel Attenuation
vs Digital Step Value
(Programmed 1.0dB Steps)
DS011958-14
FIGURE 4. LM1973 1.0dB and 2.0dB
Attenuation Step Scheme
www.national.com
5




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