an analog to digital converter system comprises an analog to digital converter and a dither generator the analog to digital converter receives an analog input signal and generates a digital signal that is proportional to the analog input signal the output of the analog to digital converter is dominated by quantization error the dither generator is responsive to a user controlled input for generating an output signal an adder sums the digital signal from the analog to digital converter with the output signal from the dither generator to provide a summed signal the summed signal is either dominated by quantization noise or is properly dithered depending upon the user controlled input application_number US 31161105 A description it is to be distinctly understood at the outset that the present invention shown in the drawings and described in detail in conjunction with the preferred embodiments is not intended to serve as a limitation upon the scope or teachings thereof but is to be considered merely as an exemplification of the principles of the present invention with reference now in detail to the drawings there is illustrated in fig1 an improved analog to digital converter adc system 10 constructed in accordance with the principles of the present invention the adc system 10 comprises an analog to digital converter 11 and a dither generator 16 the analog to digital converter 11 is operable to receive an analog signal on its input terminal 18 and converts it to a digital signal having a value that is proportional to the value of the analog input signal this digital signal on the line 22 defines output codes of the analog to digital converter 11 which are dominated by quantization error in accordance with the present invention the dither generator 16 provides a dither signal on.