HM9270D Description
The HM 9270C/D is a plete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high- and low-group filters and dial-tone rejection. Digital counting techniques are employed in the decoder to detect and decode all 16 DTMF tonepairs into a 4-bit code.
HM9270D Key Features
- plete receiver in an 18-pin package. Excellent performance. CMOS, single 5 volt operation. Minimum board area. Central o