Signal-to-noise and distortion ratio (SINADR) is a measurement of the purity of a signal. SINADR is typically used in data converter specifications. SINADR is defined as:
S I N A D R = P s i g n a l P q u a n t i z a t i o n E r r o r + P r a n d o m N o i s e + P d i s t o r t i o n where P is the average power of the signal, quantization error, random noise and distortion components. SINADR is usually expressed in dB. SINADR is a standard metric for analog-to-digital converter and digital-to-analog converter.
SINADR (in dB) is related to ENOB by the following equation:
S I N A D R = E N O B ⋅ 6.02 + 1.76 