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LM1973 bảng dữ liệu(PDF) 1 Page - Texas Instruments

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LM1973
www.ti.com
SNAS093B – DECEMBER 1994 – REVISED MARCH 2013
LM1973 µPot 3-Channel 76dB Audio Attenuator with Mute
Check for Samples: LM1973
1
FEATURES
DESCRIPTION
The LM1973 is a digitally controlled 3-channel 76dB
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–15.5dB, 1.0dB steps from 16dB–47dB, and
2.0dB steps from 48dB– 76dB, with a mute function
Pop and Click Free Attenuation Changes
attenuating 104dB. Its logarithmic attenuation curve
can be customized through software to fit the desired
APPLICATIONS
application.
Automated Studio Mixing Consoles
The performance of a
μPot is demonstrated through
Music Reproduction Systems
its excellent Signal-to-Noise Ratio, extremely low
Sound Reinforcement Systems
(THD+N), and high channel separation. Each
μPot
contains a mute function that disconnects the input
Electronic Music (MIDI)
signal
from
the
output,
providing
a
minimum
Personal Computer Audio Control
attenuation
of
96dB.
Transitions
between
any
attenuation settings are pop free.
KEY SPECIFICATIONS
The LM1973's 3-wire serial digital interface is TTL
Total Harmonic Distortion + Noise: 0.003 %
and CMOS compatible; receiving data that selects a
(max)
channel and the desired attenuation level. The Data-
Out pin of the LM1973 allows multiple
μPots to be
Frequency response: 100 kHz (
−3dB) (min)
daisy-chained together, reducing the number of
Attenuation range (excluding mute): 76 dB
enable and data lines to be routed for a given
(typ)
application.
Differential attenuation: ±0.25 dB (max)
Signal-to-noise ratio (ref. 4 Vrms): 110 dB
(min)
Channel separation: 110 dB (typ)
TYPICAL APPLICATION
CONNECTION DIAGRAM
Top View
Figure 1. Typical Audio Attenuator
Application Circuit
Figure 2. PDIP and SOIC Packages
See Package Numbers NFH0020A and DW0020B
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 © 1994–2013, 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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