ZL49021 - (ZL49010 - ZL49031) Wide Dynamic Range DTMF Receiver
The ZL490xx is a family of high performance DTMF receivers which decode all 16 tone pairs into a 4-bit binary code.
These devices incorporate an AGC for wide dynamic range and are suitable for end-to-end signalling.
The ZL490x0 provides an early steering (ESt) logic output to indicate the detection
ZL49021 Features
* Wide dynamic range (50dB) DTMF Receiver Call progress (CP) detection via cadence indication 4-bit synchronous serial data output Software controlled guard time for ZL490x0 Internal guard time circuitry for ZL49
