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          帕智電子(上海)有限公司

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          SGM4918

          80mW, Capless, Stereo Headphone Amplifier with Shutdown
           
          80mW, Capless, Stereo Headphone Amplifier with Shutdown
          GENERAL DESCRIPTION

          The SGM4918 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4918 uses capless architecture to produce a ground-referenced output from a single power supply, eliminating the need for large DC-blocking capacitors for output, saving cost, board space, and component height. Additionally, for SGM4918B, the gain is set internally (-2V/V), further reducing component count. For SGM4918A, the gain can be adjusted by external feedback resistors.

          The SGM4918 delivers up to 80mW per channel into a 32Ω load and has low 0.03% THD+N. A -78dB power supply rejection ratio (PSRR) at 217Hz allows this device to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.

          The SGM4918 operates from a single 2.7V to 5.1V supply, consumes only 5.8mA supply current, has short-circuit and thermal-overload protections, and is specified over the extended -40 to +85 temperature range. The SGM4918 is available in a Green TDFN-3×3-10L package.

          PIN CONFIGURATIONS

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          FEATURES
          • SGM4918A: External Feedback Gain Network

            SGM4918B: Fixed -2V/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

          • 80mW into 32Ω Load from 5V Power Supply at THD+N = 0.1% (TYP, per Channel)

          • Low 0.03% THD+N

          • High PSRR (-78dB at 217Hz)

          • Integrated Click-and-Pop Suppression

          • 2.7V to 5.1V Single Supply Operation

          • Low Quiescent Current (5.8mA at VDD = 5V)

          • Shutdown Control

          • Short-Circuit and Thermal-Overload Protections

          • Under-Voltage Lockout Function

          • -40 to +85 Operating Temperature Range

          • Available in a Green TDFN-3×3-10L Package

          APPLICATIONS

          Notebook PCs

          Cellular Phones

          PDAs

          MP3 Players

          Smart Phones

          Portable Audio Equipment

          ORDERING INFORMATION
          Part NumberStatusPackagePinsPb-FreeTemp Range
          SGM4918AYD10G/TRProductionTDFN-3×3-10L10Y-40℃ to +85℃
          SGM4918BYD10G/TRProductionTDFN-3×3-10L10Y-40℃ to +85℃

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