PROM trimmed digital-to-analog converter

摘要

A digital-to-analog converter apparatus (DAC) includes internal PROM-controlled compensating converter means for precisely compensating values of lesser significant bits in accordance with scale factors which depend upon the binary input values of more significant bits and which are independent of compensation of the analog output signal value corresponding to the more significant bits. The converter apparatus employs programmable read-only memory (PROM) for decoding input digital values into digital compensation values which control internal digital-to-analog converter apparatus. An analog signal out of an internal compensating digital-to-analog converter apparatus is coupled to a summing junction and an analog scaling reference. The output of the summing junction generates a compensated analog scaling value signal which is fed to a reference terminal of a digital-to-analog converter apparatus which generates the analog signal representing the lesser significant bits.