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