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LM1971 Scheda tecnica(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Il numero della parte LM1971
Spiegazioni elettronici  LM1971 Overture??Audio Attenuator Series Digitally Controlled 62 dB Audio Attenuator with/Mute
PDF  11 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1971 Scheda tecnica(HTML) 9 Page - National Semiconductor (TI)

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Application Information (Continued)
MUTE FUNCTION
A major feature of the LM1971 is its ability to mute the input
signal to an attenuation level of 102 dB. This is accom-
plished internally by physically disconnecting the output from
the input while also grounding the output pin through ap-
proximately 2 k
Ω.
The mute function is obtained during power-up of the device
or by sending any binary data of 0011 1111 and above seri-
ally to the device. The device may be placed into mute at any
time during operation, allowing the designer to make the
mute command accessible to the end-user.
DC INPUTS
Although the µPot was designed to be used as an attenuator
for signals within the audio spectrum, it is also capable of
tracking and attenuating an input DC voltage. The device will
track voltages to either supply rail.
One point to remember about DC tracking is that with a
buffer at the output of the µPot, the resolution of DC tracking
will depend upon the gain configuration of that output buffer
and its supply voltage. Also, the output buffer’s supply volt-
age does not have to be the same as the µPot’s supply volt-
age. Giving the buffer some gain can provide more resolu-
tion when tracking small DC voltages.
www.national.com
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