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LM1972MXNOPB Arkusz danych(PDF) 1 Page - Texas Instruments

Numer części LM1972MXNOPB
Szczegółowy opis  LM1972 關Pot 2-Channel 78dB Audio Attenuator with Mute
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LM1972
www.ti.com
SNAS094D – APRIL 1995 – REVISED MARCH 2013
LM1972
μPot 2-Channel 78dB Audio Attenuator with Mute
Check for Samples: LM1972
1
FEATURES
DESCRIPTION
The LM1972 is a digitally controlled 2-channel 78dB
2
3-Wire Serial Interface
audio attenuator fabricated on a CMOS process.
Daisy-Chain Capability
Each channel has attenuation steps of 0.5dB from
104dB Mute Attenuation
0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a
mute function attenuating 104dB. Its logarithmic
Pop and Click Free Attenuation Changes
attenuation
curve
can
be
customized
through
software to fit the desired application.
APPLICATIONS
The performance of a
μPot is demonstrated through
Automated Studio Mixing Consoles
its excellent Signal-to-Noise Ratio, extremely low
Music Reproduction Systems
(THD+N), and high channel separation. Each
μPot
Sound Reinforcement Systems
contains a mute function that disconnects the input
signal
from
the
output,
providing
a
minimum
Electronic Music (MIDI)
attenuation
of
96dB.
Transitions
between
any
Personal Computer Audio Control
attenuation settings are pop free.
The LM1972's 3-wire serial digital interface is TTL
KEY SPECIFICATIONS
and CMOS compatible; receiving data that selects a
Total Harmonic Distortion +
channel and the desired attenuation level. The Data-
Noise: 0.003 % (max)
Out pin of the LM1972 allows multiple
μPots to be
daisy-chained together, reducing the number of
Frequency response: 100 kHz (
−3dB) (min)
enable and data lines to be routed for a given
Attenuation range (excluding
application.
mute): 78 dB (typ)
Differential attenuation: ±0.25 dB (max)
Signal-to-noise ratio
(ref. 4 Vrms): 110 dB (min)
Channel separation: 100 dB (min)
Typical Application
Connection Diagram
Figure 1. Typical Audio Attenuator Application
Figure 2. 20-Lead SOIC - Top View
Circuit
See DW Package
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 1995–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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