Analog-to-digital converter and signal processing system

A signal processing system, comprising

• an analog-to-digital (A/D) converter configured to convert an analog signal supplied from an analog signal processing system into a digital signal, the A/D converter including
• a coarse analog-to-digital (A/D) converter configured to convert, when converting an analog input signal into an N-bit digital signal, the analog input signal into a high-order m-bit digital signal,
• a fine analog-to-digital (A/D) converter configured to convert the analog input signal into a low-order n-bit (where n=N−m) digital signal based on a conversion result of the coarse A/D converter, and
• a track-and-hold (TH) circuit configured
• to sample the analog input signal,
• to supply a comparison voltage compared with a coarse reference voltage to the coarse A/D converter, and
• to supply a comparison voltage compared with a fine reference voltage based on a conversion result of the fine A/D converter to the fine A/D converter, wherein
• the TH circuit is configured to share a sampling capacitor in a selective input path for the analog input signal, the coarse reference voltage, and the fine reference voltage.