LM49101 Series

540-mW, mono, 44-mW stereo, analog input Class-AB audio amplifier

Catalog

540-mW, mono, 44-mW stereo, analog input Class-AB audio amplifier

Part	Operating Temperature [Max]	Operating Temperature [Min]	Type	Mounting Type	Output Type	Package / Case	Max Output Power x Channels @ Load	Voltage - Supply [Min]	Voltage - Supply [Max]	Supplier Device Package	Features
Texas Instruments LM49101TM/NOPB	85 °C	-40 °C	Class AB	Surface Mount	1-Channel (Mono) with Stereo Headphones	25-WFBGA	1.3 W 45 mW	2.7 V	5.5 V	25-BGA (2.01x2.01)	Depop Differential Inputs I2C Shutdown Thermal Protection Volume Control
Texas Instruments LM49101TMX/NOPB	85 °C	-40 °C	Class AB	Surface Mount	1-Channel (Mono) with Stereo Headphones	25-WFBGA DSBGA	1.3 W 45 mW	2.7 V	5.5 V	25-DSBGA	Depop Differential Inputs I2C Shutdown Thermal Protection Volume Control

Catalog

540-mW, mono, 44-mW stereo, analog input Class-AB audio amplifier

Key Features

• Differential Mono Input and Stereo Single-Ended InputSeparate Earpiece (Receiver) Differential InputAnalog Switch for a Separate Earpiece Path32-Step Digital Volume Control (-80 to +18dB)Three Independent Volume Channels (Left, Right, Mono)Separate Headphone Volume ControlFlexible Output for Speaker and Headphone OutputTrue Ground Headphone Amplifier Eliminates Large DC Blocking Capacitors Reducing PCB Space and CostHardware Reset FunctionRF Immunity Topology"Click and Pop" Suppression CircuitryThermal Shutdown ProtectionMicro-Power ShutdownI2C Control InterfaceAvailable in Space-Saving DSBGA PackageKey SpecificationsSupply Voltage (VDDLS): 2.7V ≤ VDDLS ≤ 5.5VSupply Voltage (VDDHP): 1.8V ≤ VDDHP ≤ 2.9VI2C Supply Voltage: 1.7V ≤ I2CVDD≤ 5.5VOutput Power, VDDLS = 5V, VDDHP = 2.75V, 1% THD+NRL= 8Ω Speaker 1.3W (Typ)RL= 32Ω Headphone 45mW (Typ)Output Power VDDLS = 3.3V, VDDHP = 2.75V, 1% THD+NRL= 8Ω Speaker 540W (Typ)RL= 32Ω Headphone 40mW (Typ)PSRR: VDD= 3.3V, 217Hz Ripple, Mono In: 90dB (Typ)Shutdown Power Supply Current: 0.01μA (Typ)All trademarks are the property of their respective owners.Differential Mono Input and Stereo Single-Ended InputSeparate Earpiece (Receiver) Differential InputAnalog Switch for a Separate Earpiece Path32-Step Digital Volume Control (-80 to +18dB)Three Independent Volume Channels (Left, Right, Mono)Separate Headphone Volume ControlFlexible Output for Speaker and Headphone OutputTrue Ground Headphone Amplifier Eliminates Large DC Blocking Capacitors Reducing PCB Space and CostHardware Reset FunctionRF Immunity Topology"Click and Pop" Suppression CircuitryThermal Shutdown ProtectionMicro-Power ShutdownI2C Control InterfaceAvailable in Space-Saving DSBGA PackageKey SpecificationsSupply Voltage (VDDLS): 2.7V ≤ VDDLS ≤ 5.5VSupply Voltage (VDDHP): 1.8V ≤ VDDHP ≤ 2.9VI2C Supply Voltage: 1.7V ≤ I2CVDD≤ 5.5VOutput Power, VDDLS = 5V, VDDHP = 2.75V, 1% THD+NRL= 8Ω Speaker 1.3W (Typ)RL= 32Ω Headphone 45mW (Typ)Output Power VDDLS = 3.3V, VDDHP = 2.75V, 1% THD+NRL= 8Ω Speaker 540W (Typ)RL= 32Ω Headphone 40mW (Typ)PSRR: VDD= 3.3V, 217Hz Ripple, Mono In: 90dB (Typ)Shutdown Power Supply Current: 0.01μA (Typ)All trademarks are the property of their respective owners.

Description

The LM49101 is a fully integrated audio subsystem with a mono power amplifier capable of delivering 540mW 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 44mW 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 the headphone output stage. The digital volume control and output modes, programmed through a two-wire I2C compatible interface, allows flexibility in routing and mixing audio channels. The LM49101 is designed for cellular phones, PDAs, and other portable handheld applications. The high level of integration minimizes external components. The True Ground headphone amplifier eliminates the physically large DC blocking output capacitors reducing required board space and reducing cost. The LM49101 is a fully integrated audio subsystem with a mono power amplifier capable of delivering 540mW 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 44mW 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 the headphone output stage. The digital volume control and output modes, programmed through a two-wire I2C compatible interface, allows flexibility in routing and mixing audio channels. The LM49101 is designed for cellular phones, PDAs, and other portable handheld applications. The high level of integration minimizes external components. The True Ground headphone amplifier eliminates the physically large DC blocking output capacitors reducing required board space and reducing cost.