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Output Capacitor-Less Audio Subsystem with Programmable National 3D


Package | PIN: RTW | 24
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $4.67
10-24 $4.20
25-99 $3.92
100-249 $3.52
250-499 $3.28
500-749 $2.85
750-999 $2.47
1000+ $2.42


  • I 2C/SPI Control Interface
  • I 2C/SPI programmable National 3D Audio
  • I 2C/SPI controlled 32 step digital volume control (-54dB to +18dB)
  • Three independent volume channels (Left, Right, Mono)
  • Eight distinct output modes
  • LLP and microSMD surface mount packaging
  • “Click and Pop” suppression circuitry
  • Thermal shutdown protection
  • Low shutdown current (0.02uA, typ)
  • RF immunity topology

  • Texas Instruments  LM4946SQ/NOPB

    The LM4946 is an audio power amplifier capable of delivering 540mW of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N, 35mW per channel of continuous average power into stereo 32Ω single-ended (SE) loads with 1% THD+N, or an output capacitor-less (OCL) configuration with identical specifications as the SE configuration, from a 3.3V power supply.

    The LM4946 has three input channels: one pair for a two-channel stereo signal and the third for a differential single-channel mono input. The LM4946 features a 32-step digital volume control and eight distinct output modes. The digital volume control, 3D enhancement, and output modes (mono/SE/OCL) are programmed through a two-wire I 2C or a three-wire SPI compatible interface that allows flexibility in routing and mixing audio channels.

    The LM4946 is designed for cellular phone, PDA, and other portable handheld applications. It delivers high quality output power from a surface-mount package and requires only seven external components in the OCL mode (two additional components in SE mode).

    Key Specifications

    THD+N at 1kHz, 540mW into 8Ω BTL (3.3V) 1.0% (typ)
    THD+N at 1kHz, 35mW into 32Ω SE (3.3V) 1.0% (typ)
    Single Supply Operation (VDD) 2.7 to 5.5V
    I 2C/SPI Single Supply Operation  
    LLP 2.2 to 5.5V
    micro SMD 1.7 to 5.5V