FS1818U is a smart PA chip integrated with FourSemi SDG, which is speaker excursion and temperature protection algorithm, FS Sound audio algorithm and I/V sense function. It has low power consumption and mini size, and applies to mobile phones, tablets, smart watches, etc.
● High fidelity 24-bits DAC
-104dB SNR
-16µV output noise
● High efficiency adaptive boost
-Maximum boost up to 6.1V
-Support adaptive mode for optimized power consumption
● High efficiency Class-D
-Integrated high efficiency Class-D amplifier
-Up to 2.05W RMS output power with 8Ω load
-90% at 0.5W in 8Ω with 4.0V VBAT
-81% at 2W in 8Ω with 4.0V VBAT
● I/V sense protection
-Adaptive speaker membrane displacement control
-Adaptive speaker voice coil temperature control
● Built-in audio processor
-10-Bands parametric equalizer
-Programmable compressor & limiter
-Stereo configuration integrated for RAS
-FS Sound integrated
● Digital I2S I/O
-I2S I/O-8KHz-48kHz sample rates
● I2C control port maximum speed up to 1MHz
| Part Number | Package | Size(mm) |
| FS1818U | WLCSP-20 | 1.58 x 1.98 |
FourSemi was founded in 2016. The founding team comes from well-known international semiconductor companies, such as Qualcomm, NXP, Texas Instruments, etc. The core backbone team all have more than 20 years of semiconductor industry experience. FourSemi focuses on high-performance digital-analog hybrid chip design. Products cover smart PA, audio power amplifier, haptics driver, car audio, professional audio system and are widely used in mobile phones, tablets, wearable devices, smart speakers, automotive applications, personal computers , etc.
FourSemi launched domestic Smart PA FS1601 and large power amplifier FS2105 in 2017 and 2021 respectively, achieving a breakthrough in this field in China.