SGM8910.pdf
No.11219
● Capless Structure to Eliminate Pop-Clicks and Output
DC-Blocking Capacitors
● 2.8V to 12V Supply Voltage
● Low Noise, Low THD and Low Crosstalk:
Typical Vn < 6.5μVRMS from 20Hz to 20kHz at Gain = -1
THD+N < 0.002% for 10kΩ Load and Gain = -1 at 1kHz
Crosstalk is -89dB at 1kHz
● 4Vrms Output Voltage into 600Ω Load for 10V VDD
● 1Vrms Output Voltage into 600Ω Load for 3.3V VDD
● Supports to Drive 32Ω to 600 Ω Headset:10mW for 32Ω Headset at
VDD = 3.3V
● Single-Ended Output
● Differential or Single-Ended Input
● UVP Function to Cancel Turn Off Click-Pop Noise
● Adjustable Power-On Blanking Time to Eliminate Turn on Click-Pop Noise
● Short-Circuit and Thermal Protection for Audio Driver
● Negative LDO has Output Auto-Discharge Function in Disable Status
● 1.8V Logical Control for EN and MUTE
● -40℃ to +85℃ Operating Temperature Range
● Available in the Green TSSOP-20 and TQFN-4×4-20L Packages
The SGM8910 is a high performance 4Vrms stereo audio line driver with click-pop noise cancelling in the applications where single power supply, PCB size and no click-pop noise are critical, it reduces external component count and board space. SGM8910 can drive 32Ω impedance headset directly, so it can be used as the high performance driver of line out and headset in different applications.
SGM8910 integrates a charge pump and negative low drop output voltage regulator to generate a low noise negative supply rail that supports it to provide a clean, pop-free and ground-biased output. The SGM8910 is capable of driving 4Vrms into a 600Ω load when VDD is 10V or 10mW into 32Ω headset when VDD is 3.3V. Capless output structure allows the removal of the costly output DC-blocking capacitors. For some special applications where AC coupling output is necessary, SGM8910 provides MUTEOUT driver to drive external click-pop noise cancelling circuit during power on and power off.
SGM8910 will be in mute status during power-on blanking time, external mute control signal can take over the mute status before power-on blanking time is over, SGM8910 can cancel power up click-pop noise perfectly. Using under-voltage protection (UVP), SGM8910 will cancel the turn off click-pop noise perfectly.
