DA CONVERSION CIRCUIT, INTEGRATED CIRCUIT DEVICE, ELECTRONICS

PROBLEM TO BE SOLVED: To provide a DA conversion circuit which can be applied to DA conversion processing of comparatively large number of bits, and can be implemented with a relatively small layout area. SOLUTION: A DA conversion circuit 1 comprises DA conversion processing sections 1-k (10-1 to 10-k) for each converting digital signals 40-1 through 40-k obtained by dividing an n-bit digital signal 40 by k into analog signals, output resistance adjustment sections 1-k (20-1 to 20-k) connected with the outputs of the DA conversion processing sections 1-k, respectively, and an output signal generation section 30 for generating an analog signal 32 based on the outputs from the output resistance adjustment sections 1-k. At least one DA conversion processing section is constituted as a resistance string type DA conversion circuit. Each output resistance adjustment section 1-k includes a variable resistance circuit for varying the resistance to have a value substantially the same as the output resistance depending on variation in output resistance of a DA conversion processing section connected with other output resistance adjustment section and constituted as a resistance string type DA conversion circuit. COPYRIGHT: (C)2009,JPO&INPIT