SGM4917 Datasheet | SG Micro

Preliminary Datasheet SGM4917 125m W, Capless, Stereo Headphone Amplifier with Shutdown GENERAL DESCRIPTION The SGM4917 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4917 uses capless Direct-drive architecture to produce a ground-referenced output from a single power supply, eliminating the need for large DC-blocking capacitors for output, and saving cost, board space, and ponent height. Additionally, for SGM4917B and SGM4917C, the gain is set internally (-2V/V or -1.5V/V), further reducing ponent count. For SGM4917A, the Gain can be adjusted by external feedback resistors. The SGM4917 delivers up to 125m W per channel into a 32Ω load and has low 0.02% THD+N. A 78d B at 217Hz power-supply rejection ratio (PSRR) allows this device to operate from noisy digital supplies without an additional linear regulator. prehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. Features - SGM4917A: External Feedback Gain Network SGM4917B: Fixed -2V/V Gain SGM4917C: Fixed -1.5V/V Gain - No Bulky DC-Blocking Capacitors Required - Ground-Referenced Outputs Eliminate DC-Bias Voltage on Headphone Ground Pin - No Degradation of Low-Frequency Response Due to Output Capacitors - Differential Inputs for Enhanced Noise Cancellation - 125m W per Channel into 32Ω Headset - Low 0.02% THD+N - High PSRR (78d B at 217Hz) - Integrated Click-and-Pop Suppression - 2.7V to 5.5V Single Supply Operation - Low Quiescent Current (2.7m A) - Shutdown Control - Undervoltage Lockout Function - -40℃ to +85℃ Operating Temperature Range - Green TSSOP16 and TQFN3×3-16L Packages The SGM4917 operates from a single 2.7V to 5.5V supply, consume only 2.7m A of supply current, and is specified over the extended -40°C to +85°C temperature range. The SGM4917 is available in a Green TSSOP16 and TQFN3×3-16L packages. APPLICATIONS Notebook PCs Cellular Phones PDAs MP3 Players Smart Phones Portable Audio Equipment SG...