圣邦微电子

SGM4916 88mW, Capless, Stereo Headphone Amplifier with Shutdown

GENERAL DESCRIPTION

The SGM4916 stereo headphone amplifier is designed for portable equipment where board space is at a premium. The SGM4916 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 SGM4916B, the gain is set internally (-1.5V/V), further reducing component count. For SGM4916A, the gain can be adjusted by external feedback resistors.

The SGM4916 delivers up to 88mW per channel into a 32Ω load and has low 0.034% THD+N. A -70dB 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 SGM4916 operates from a single 2.7V to 5.5V supply, consumes only 2.7mA supply current, has short-circuit and thermal-overload protections, and is specified over the extended -40 to +85 temperature range. The SGM4916 is available in a Green TQFN-3×3-12L package.


PIN CONFIGURATIONS


FEATURES

• SGM4916A: External Feedback Gain Network
    SGM4916B: 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
• 88mW into 32Ω Load from 5V Power Supply at
    THD+N = 0.1% (TYP, per Channel)
• Low 0.034% THD+N
• High PSRR (-70dB at 217Hz)
• Integrated Click-and-Pop Suppression
• 2.7V to 5.5V Single Supply Operation
• Low Quiescent Current (2.7mA at VDD = 5V)
• Shutdown Control
• Short-Circuit and Thermal-Overload Protections
• Undervoltage Lockout Function
• -40
 to +85 Operating Temperature Range
• Available in Green TQFN-3×3-12L Package

APPLICATIONS

Notebook PCs
Cellular Phones
PDAs
MP3 Players
Smart Phones
Portable Audio Equipment


ORDERING INFORMATION

Part Number Status Package Pins Pb-Free Temp Range
SGM4916AYTQJ12G/TR Production TQFN-3×3-12L 12 Y -40℃ to +85℃ Samples
SGM4916BYTQJ12G/TR Production TQFN-3×3-12L 12 Y -40℃ to +85℃ Samples

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