The MT8870D/MT8870D-1 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters; the decoder uses digital counting techniques to detect and decode all 16 DTMF tonepairs into a 4-bit code. External component count is minimized by on chip provision of a differential input amplifier, clock oscillator and latched three-state bus interface.
Features
Applications
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Receiver system for British Telecom (BT) or CEPT Spec (MT8870D-1)
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Paging systems
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Repeater systems/mobile radio
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Credit card systems
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Remote control
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Personal computers
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Telephone answering machine
