LM49101 Datasheet | Texas Instruments

FEATURES - 2 Differential Mono Input and Stereo Single Ended Input - Separate Earpiece (Receiver) Differential Input - Analog Switch for a Separate Earpiece Path - 32-Step Digital Volume Control (-80 to +18d B) - Three Independent Volume Channels (Left, Right, Mono) - Separate Headphone Volume Control - Flexible Output for Speaker and Headphone Output - True Ground Headphone Amplifier Eliminates Large DC Blocking Capacitors Reducing PCB Space and Cost - Hardware Reset Function - RF Immunity Topology - “Click and Pop” Suppression Circuitry - Thermal Shutdown Protection - Micro-Power Shutdown - I2C Control Interface - Available in Space-Saving DSBGA Package KEY SPECIFICATIONS - Supply Voltage (VDDLS): 2.7V ≤ VDDLS ≤ 5.5V - Supply Voltage (VDDHP): 1.8V ≤ VDDHP ≤ 2.9V - I2C Supply Voltage: 1.7V ≤ I2CVDD ≤ 5.5V - Output Power, VDDLS = 5V, VDDHP = 2.75V, 1% THD+N - RL = 8Ω Speaker 1.3W (Typ) - RL = 32Ω Headphone 45m W (Typ) - Output Power VDDLS = 3.3V, VDDHP = 2.75V, 1% THD+N - RL = 8Ω Speaker 540W (Typ) - RL = 32Ω Headphone 40m W (Typ) - PSRR: VDD = 3.3V, 217Hz Ripple, Mono In: 90d B (Typ) - Shutdown Power Supply Current: 0.01μA (Typ) APPLICATIONS - Portable Electronic Devices - Mobile Phones - PDAs DESCRIPTION The LM49101 is a fully integrated audio subsystem with a mono power amplifier capable of delivering 540m W of continuous average power into an 8Ω BTL speaker load with 1% THD+N using a 3.3V supply. The LM49101 includes a separate stereo headphone amplifier that can deliver 44m W per channel into 32Ω loads using a 2.75V supply. The LM49101 has four input channels. A pair of single-ended inputs and a fully differential input channel with volume control and amplification stages. Additionally, a bypass differential input is available that connects directly to the mono speaker outputs through an analog switch without any amplification or volume control stages. The LM49101 features a 32- step digital volume control on the input stage and an 8- step digital volume control on...