PURPOSE: A source driving chip is provided to save costs for driving an external driving circuit by using an amplifier in a disposed data channel. CONSTITUTION: A source driving chip comprises a reference voltage input terminal(1) and a data signal output channel(3). The data signal output channel comprises an operational amplifier. The operational amplifier is used for outputting the data signal. An operational amplifier in a disposed data channel is connected to a reference voltage input terminal and amplifies an external circuit signal.
