LM49155

ACTIVO

Subsistema de audio analógico de supresión de ruido ascendente y mejora de SNR descendente

Detalles del producto

Operating temperature range (°C) to Rating Catalog
Operating temperature range (°C) to Rating Catalog
DSBGA (YZR) 36 10.5625 mm² 3.25 x 3.25

  • Noise cancellation for uplink and downlink without DSP-type artifacts, distortions or delays
  • Adapting AGC on ambient noise level & downlink signal strength for earpiece
  • Downlink adjustable noise-reducing high pass filter
  • E 2 S Class D Amplifier with ALC
  • Ground Referenced Headphone Outputs with Advanced Click Pop Suppression
  • Micro-power shutdown

  • Noise cancellation for uplink and downlink without DSP-type artifacts, distortions or delays
  • Adapting AGC on ambient noise level & downlink signal strength for earpiece
  • Downlink adjustable noise-reducing high pass filter
  • E 2 S Class D Amplifier with ALC
  • Ground Referenced Headphone Outputs with Advanced Click Pop Suppression
  • Micro-power shutdown

  • The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49155 combines a Noise Suppression microphone amplifier, a 1.35W mono class D amplifier with ALC, class AB earpiece driver with AGC, a high efficiency, stereo, ground referenced headphone amplifier with click pop suppression and I 2C modes select and volume control.

    The LM49155 features analog fully differential input, and differential output microphone amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications. Downlink SNR enhancement with an advanced acoustic AGC technology to adjust output levels.

    The LM49155 speaker amplifier features National’s unique output limiter that provides both a no-clip feature and speaker protection. The E 2S class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. The headphone drivers feature National’s ground referenced architecture that creates a ground-referenced output from a single, low-voltage supply.

    The LM49155 is available in an ultra-small 36-bump micro SMD package (3.434mm x 3.459mm x 0.6mm).

    Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html


    Key Specifications

    Uplink Far Field Noise Suppression  Electrical FFNSE at f = 1kHz 34dB (typ)
    Downlink SNR Enhancement Earpiece Amplifier
      Near-Field SNR Enhancement  Downlink SNRIE 6 to 18dB (typ) 16dB (typ)
    Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH
     POUT, THD+N %, VDD = 5.0V 1.35W (typ)
    Headphone Amplifier RL = 32Ω
     POUT, THD+N %, HPVDD = 1.8V 19mW (typ)

    The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49155 combines a Noise Suppression microphone amplifier, a 1.35W mono class D amplifier with ALC, class AB earpiece driver with AGC, a high efficiency, stereo, ground referenced headphone amplifier with click pop suppression and I 2C modes select and volume control.

    The LM49155 features analog fully differential input, and differential output microphone amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications. Downlink SNR enhancement with an advanced acoustic AGC technology to adjust output levels.

    The LM49155 speaker amplifier features National’s unique output limiter that provides both a no-clip feature and speaker protection. The E 2S class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. The headphone drivers feature National’s ground referenced architecture that creates a ground-referenced output from a single, low-voltage supply.

    The LM49155 is available in an ultra-small 36-bump micro SMD package (3.434mm x 3.459mm x 0.6mm).

    Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html


    Key Specifications

    Uplink Far Field Noise Suppression  Electrical FFNSE at f = 1kHz 34dB (typ)
    Downlink SNR Enhancement Earpiece Amplifier
      Near-Field SNR Enhancement  Downlink SNRIE 6 to 18dB (typ) 16dB (typ)
    Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH
     POUT, THD+N %, VDD = 5.0V 1.35W (typ)
    Headphone Amplifier RL = 32Ω
     POUT, THD+N %, HPVDD = 1.8V 19mW (typ)

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    Documentación técnica

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    * Data sheet Uplink Noise Supp & Dwnlnk SNR Enhance Analog Audio Subsystm datasheet 21 jul 2010

    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

    Soporte y capacitación

    Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

    El contenido lo proporcionan “tal como está” TI y los colaboradores de la comunidad y no constituye especificaciones de TI. Consulte los términos de uso.

    Si tiene preguntas sobre la calidad, el paquete o el pedido de productos de TI, consulte el soporte de TI. ​​​​​​​​​​​​​​