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The CS9370 is a full-featured DTMF receiver that combines the operations of a band split filter and a digital decoder. Switched capacitor techniques are used in the filter section's high- and low-group filters as well as dial-tone rejection. The decoder uses digital counting algorithms to recognise and convert all 16 DTMF tone-pairs into 4-bit code. The installation of a differential input amplifier, clock oscillator, and latched 3-state bus interface on-chip reduces the number of external components.