LM1972 - Micro-Pot 2-Channel 78 dB Audio Attenuator with Mute
Datasheet Packaging Samples & Pricing Reliability Knowledge Base

Features
• 3-wire serial interface
• Daisy-chain capability
• 104dB mute attenuation
• Pop and click free attenuation changes

Key Specification

Total Harmonic Distortion + Noise:

0.003% (max)

Frequency response:

100 kHz (−3dB) (min)

Attenuation range (excluding mute):

78dB (typ)

Differential attenuation:

±0.25dB (max)

Signal-to-noise ratio (ref. 4 Vrms):

110dB (min)

Channel separation:

100dB (min)

General Description

The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. More...


Applications

• Automated studio mixing consoles
• Music reproduction systems
• Sound reinforcement systems
• Electronic music (MIDI)
• Personal computer audio control
  Typical Application
click for larger image


ParametersValues
THD 0.0008 %
SNR 120 dB
Special Features 2 Channels, Digitally controlled audio attenuator
Supply Min 4.5 Volt
Supply Max 15 Volt
Equivalent Input Noise 13 uV/root(Hz)
Separation 110 dB
Interface Type Serial
Temperature Min 0 deg C
Temperature Max 70 deg C


Typical Performance

click for larger image


  Connection Diagram
click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute 406
Kbytes		 8-Mar-07 Download
LM1972 μPot 2-Channel 78dB Audio Attenuator with Mute (Japanese)
 669 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM1972MSOIC WIDE20NOPB
STD		3
2A		260
220		RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$2.00rail
of
36		NSUZXYTTE#
LM1972M
16 weeks1000
LM1972MXSOIC WIDE20NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$2.00reel
of
1000		NSUZXYTTE#
LM1972M
16 weeks3000

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM1972N
NONE
NATIONAL SEMICONDUCTOR
05 Sep 2006

General Description

The LM1972 is a digitally controlled 2-channel 78dB audio attenuator fabricated on a CMOS process. Each channel has attenuation steps of 0.5dB from 0dB–47.5dB, 1.0dB steps from 48dB–78dB, with a mute function attenuating 104dB. Its logarithmic attenuation curve can be customized through software to fit the desired application.

The performance of a μPot is demonstrated through its excellent Signal-to-Noise Ratio, extremely low (THD+N), and high channel separation. Each μPot contains a mute function that disconnects the input signal from the output, providing a minimum attenuation of 96dB. Transitions between any attenuation settings are pop free.

The LM1972's 3-wire serial digital interface is TTL and CMOS compatible; receiving data that selects a channel and the desired attenuation level. The Data-Out pin of the LM1972 allows multiple μPots to be daisy-chained together, reducing the number of enable and data lines to be routed for a given application.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM1972MP2CMOS0497350143300002556689228
LM1972MXP2CMOS0497350143300002556689228

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 8-Nov-2009]