LM49155 Datasheet | National Semiconductor

Description The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49155 bines 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 I2C 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 munication 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 E2S 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://.national./support/dir.html Key Specifications -  Uplink Far Field Noise Suppression Electrical FFNSE at f = 1k Hz Near-Field SNR Enhancement Downlink SNRIE POUT, THD+N ≤ %, VDD = 5.0V 34d B (typ) -  Downlink SNR Enhancement Earpiece Amplifier 6 to 18d B (typ) 16d B (typ) -  Class D Loudspeaker Amplifier RL = 15μH+8Ω+15μH 1.35W (typ) -  Headphone Amplifier RL = 32Ω POUT, THD+N ≤ %, HPVDD = 1.8V 19m W (typ) Features - Noise cancellation for uplink and downlink without DSPtype artifacts, distortions or delays strength for earpiece - Adapting AGC on ambient...