wide Dynamic Range (50db) DTMF receiver with early DTMF tone detection and power down mode (4.19MHz Xtal)<br>wide Dynamic Range (50db) DTMF receiver with early DTMF tone detection (4.19MHz Xtal)<br>wide Dynamic Range (50db) DTMF receiver with Delayed DTMF tone detection and power down mode (4.19MHz Xtal)<br>wide Dynamic Range (50db) DTMF receiver with delayed DTMF tone detection (4.19MHz Xtal)<br>