GENERAL DEscriptION

The SGM8909 is a single-ended, 3Vrms stereo audio line driver with integrated audio filter. The device is ideal for single supply applications. Capless design can eliminate output DC-blocking capacitors for less-component count and low-cost.

The SGM8909 is capable of driving 3Vrms into a 600Ω load when VCC is 5V or 30mW into 32Ω headset when VCC is 3.3V. An integrated charge pump generates a negative power rail that provides a clean, pop-free ground offset.

The device has a gain programming pin. With a single resistor from this pin to ground, device gain can be changed to match the line driver and the codec output level. Built-in active mute control, -90dB attenuation, helps for pop-free mute on/off control.

The SGM8909 will be in mute status during power-on blanking time. External mute control can take over the mute status before power-on blanking time is over. The SGM8909 can eliminate power up click-pop noise perfectly. Using the under-voltage protection (UVP) function, SGM8909 will minimize the turn off click-pop noise.

The SGM8909 is available in a Green TSSOP-14 package. It operates over an ambient temperature range of -40℃ to +85℃.

FEATURES

• Supply Voltage: 2.8V to 5.5V

• Capless Structure to Eliminate Pop-Clicks and Output DC-Blocking Capacitors

• Low Noise, Low THD and Low Crosstalk:

  SNR = 107dB at Gain = -1, 600Ω Load for 5V VCC

  Typical VN = 8.7μVrms from 20Hz to 20kHz at Gain = -1

  THD+N = 0.007% for 600Ω Load and Gain = -1

• Crosstalk = -87dB at 1kHz

• 3Vrms Output Voltage into 600Ω Load for 5V VCC

• 2Vrms Output Voltage into 600Ω Load for 3.3V VCC

• Supports 32Ω Headset: 30mW at VCC = 3.3V

• Single-Ended Input and Output

• Programmable Gain by Single External Resistor

• Active Mute with More than -90dB Attenuation

• UVP Function to Eliminate Turn Off Click-Pop Noise

• Integrated Audio Filter

• Adjustable Power-On Blanking Time to Eliminate Turn-on Click-Pop Noise

• Short-Circuit and Thermal Protection

• -40℃ to +85℃ Operating Temperature Range

• Available in a Green TSSOP-14 Package

APPLICATIONS

LCD TVs

Mini/Micro Combo Systems

Soundcards