Description
The MT3x7xB 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.

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 MT3x70B
• Internal guard time circuitry for MT3x71B
• Powerdown option (MT317xB & MT337xB)
• 4.194304MHz crystal or ceramic resonator (MT337xB and MT327xB)
• External clock input (MT317xB)
• Guarantees non-detection of spurious tones

APPLICATIONs
• Integrated telephone answering machine
• End-to-end signalling
• Fax Machines