Method and device for data transmission with reduced supply noise

A data transmission device configured based on a pulse amplitude modulation (PAM)-M data encoding rule, the data transmission device comprising:

• a communication unit;
• a memory configured to store at least one instruction;
• and
• a processor connected to the communication unit, wherein the processor, by executing the at least one instruction, is configured to:
• determine a level L among a total of T levels based on a reception error rate of M data symbols, wherein T is determined based on M that is a number of the data symbols,
• identify a first encoding rule of mapping a plurality of pieces of N-bit data and the M data symbols, according to the determined level L, wherein an absolute value of a sum of the M data symbols is equal to or less than the determined level L,
• obtain a plurality of segmented pieces of data by performing segmentation on input data in units of N bits,
• map the obtained plurality of segmented pieces of data to the M data symbols based on the identified first encoding rule, and
• transmit the M data symbols obtained as a result of mapping through a plurality of single-ended data lines.