LM49101TMX

• Product Introduction

 peculiarity   Differential mono input and stereo single-ended input Differential input for independent headsets (receivers). An analog switch for a separate earpiece path 32-step digital volume control (-80 to 18 dB) Three independent volume channels (left, right, mono) Independent headphone volume control Flexible output speaker and headphone outputs Authentically, headphone amplifiers eliminate large DC blocking capacitors, reducing board space and cost. Hardware reset function RF anti-interference topology "click" suppression circuit Thermal shutdown protection Micropower shutdown i 2C control interface Space-saving microSMD package   illustrate LM49101 is a fully integrated mono power amplifier capable of delivering a continuous average power of 540mW using a 3.3V power supply load into a 1% THD+N with 8ΩBTL loudspeakers. LM49101 includes a stand-alone stereo headphone amplifier that delivers 44mW to 32Ω load per channel using a 2.75V supply. LM49101 has 4 input channels. A pair of single-ended inputs and a fully differential input channel with volume control and amplification stages. In addition, bypass differential inputs can be connected directly to mono speaker outputs without any amplification or volume control stages via analog switches. A 32-step input digital volume control on stage and 8-step digital volume control on the headphone output stage LM49101 functions. Digital volume control and output modes, programming via a two-wire i 2C compatible interface, allowing for flexible routing and mixing of audio channels. LM49101 are designed for use in cellular phones, PDAs, and other portable handheld applications. High integration with minimal external components. True headphone amplifiers eliminate the body's large DC output capacitance, reduce board space required and reduce costs. Key specifications: ■ Supply voltage (V DD LS) 2.7V ≤ V DD LS ≤ 5.5V ■ Power supply voltage (V DD HP) 1.8V ≤ V DD HP ≤ 2.9V ■ I 2C power supply voltage 1.7V ≤ I 2CV DD ≤ 5.5V ■ Output power   The V DD LS = 5V, V DD HP = 2.75V 1% THD + N   R L = 8Ω speaker 1.3W (typical)   R L = 32Ω headphones 45MW (typical) ■ Output power   The V DD LS = 3.3V, V DD HP = 2.75V 1% THD + N   R L = 8Ω speaker 540W (typical)   R L = 32Ω headphones 40MW (typical) ■  PSRR： VDD = 3.3V, 217Hz ripple, Mono in 90 dB (typical) ■ Shut off the power supply 0.01μA (typical)

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