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Circuitos integrados de control de volumen

LM1972

ACTIVO

Atenuador de audio de 2 canales y 78 db μPot con silencio

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LM1972

ACTIVO
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Detalles del producto

Number of channels 2 Power supply (V) 4.5 to 15 Gain & attenuation (dB) 0dB to -78dB with 0.5dB steps THD + N at 1 kHz (%) 0.0008 Interchannel crosstalk at 1 kHz (dBFS) -110 Dynamic range (dB) 115 Operating temperature range (°C) 0 to 70 Features 2 Channels, Digitally controlled audio attenuator
Number of channels 2 Power supply (V) 4.5 to 15 Gain & attenuation (dB) 0dB to -78dB with 0.5dB steps THD + N at 1 kHz (%) 0.0008 Interchannel crosstalk at 1 kHz (dBFS) -110 Dynamic range (dB) 115 Operating temperature range (°C) 0 to 70 Features 2 Channels, Digitally controlled audio attenuator
SOIC (DW) 20 131.84 mm² 12.8 x 10.3
  • 3-Wire Serial Interface
  • Daisy-Chain Capability
  • 104dB Mute Attenuation
  • Pop and Click Free Attenuation Changes

Key Specifications

  • Total Harmonic Distortion +
    Noise: 0.003 % (max)
  • Frequency response: 100 kHz (−3dB) (min)
  • Attenuation range (excluding
    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)

All trademarks are the property of their respective owners.

  • 3-Wire Serial Interface
  • Daisy-Chain Capability
  • 104dB Mute Attenuation
  • Pop and Click Free Attenuation Changes

Key Specifications

  • Total Harmonic Distortion +
    Noise: 0.003 % (max)
  • Frequency response: 100 kHz (−3dB) (min)
  • Attenuation range (excluding
    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)

All trademarks are the property of their respective owners.

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.

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.
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Documentación técnica

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* Data sheet LM1972 Pot 2-Channel 78 dB Audio Attenuator with Mute datasheet (Rev. D) 20 mar 2013

Diseño y desarrollo

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Herramienta de simulación

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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

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