The GT4798 is an audio headset analog switch used to detect 3.5mm accessories and switch SLEEVE and RING2 pins through an external control module. The main structure of GT4798 is a set of single-pole double-throw switches. There are low-impedance MOSFETs to ground on the SLEEVE and RING2 pins respectively, with a resistance as low as 70mΩ, ensuring extremely low audio signal crosstalk. The ground MOSFET design of this chip supports direct FM signal transmission, enabling the earphone ground wire to be used as an FM antenna in mobile audio applications. The resistance of the headphone channel is 5Ω, the total harmonic distortion is 0.01%, and the crosstalk between channels is -110dB at 20KHz, which greatly enhances the stability of audio signal transmission. 

The GT4798 is packaged in WLCSP-9 and has a working temperature range of -40℃ to +85℃. It is suitable for use in scenarios such as mobile phones, tablets and laptops.