A touch input sensing apparatus includes a driver configured to output a signal to sensing electrodes, a sensor configured to sense a touch input from the sensing electrodes, and a reference signal generator configured to output a first clock signal to the driver and output a second clock signal to the sensor. The second clock signal frequency is k times greater than a frequency of the first clock signal. The reference signal generator is configured to synchronize the first clock signal with the second clock signal to delay a phase of the second clock signal is delayed from the first clock signal between 0 degrees and 180/k degrees, wherein k is a constant greater than 1.