Image sensor, endoscope and control device

An image sensor comprising:

• a pixel unit including a plurality of pixels arranged in a two-dimensional matrix, each of the plurality of pixels being configured to generate, by receiving light, a first signal corresponding to an amount of the received light, and output the first signal;
• an AD converter configured to convert the first signal output from each of the plurality of pixels into a digital second signal by performing AD conversion processing for the first signal, and output the second signal;
• a transmitter/receiver configured to transmit and receive, in a time division manner, transmission data including at least the second signal in a first period, and reception data input from an outside in a second period, the reception data including a setting signal and a clock recovery symbol having a clock edge for detecting transition timing of data;
• a first generator configured to generate a first clock signal synchronized with the clock edge included in the reception data;
• and
• a second generator configured to generate, based on the first clock signal, a second clock signal for driving the pixel unit and the AD converter at fixed reference timing, and output the second clock signal to the pixel unit and the AD converter, wherein
• the first generator includes:
• a phase frequency comparator configured to output an input signal indicating a comparison result of comparing the first clock signal and the reception data with each other;
• a charge pump unit configured to, based on the input signal input from the phase frequency comparator, adjust a voltage of the input signal and output the input signal;
• a loop filter unit configured to smooth the voltage of the input signal input from the charge pump unit and outputs the input signal;
• a first voltage control oscillator configured to generate and output a third clock signal having a frequency corresponding to the input signal input from the loop filter unit;
• a DA converter configured to perform DA conversion processing for the third clock signal input from the first voltage control oscillator and output the third clock signal;
• and
• a second voltage control oscillator configured to generate and output the first clock signal having a frequency corresponding to a voltage of the analog third clock signal input from the DA converter, and
• the transmitter/receiver is configured to switch between the first period and the second period every horizontal line in the pixel unit, and transmit and receive the transmission data and the reception data in a time division manner.