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Clare  Inc.
Clare Inc.


M-8880 DTMF Transceiver

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M-8880 DTMF Transceiver
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Advanced CMOS technology for low power consumption and increased noise immunity Complete DTMF transmitter/receiver in a single chip Standard 6500/6800 series microprocessor port Central office quality and performance Adjustable guard time Automatic tone burst mode Call progress mode Single +5 Volt power supply 20-pin DIP and SOIC packages 2 MHz microprocessor port operation Inexpensive 3.58 MHz crystal No continuous f2 clock required, only strobe Applications include: paging systems, repeater systems/mobile radio, interconnect dialers, PBX systems, computer systems, fax machines, pay telephones, credit card verification Figure 1 Pin Diagram

Functional Description
M-8880 functions consist of a high-performance DTMF receiver with an internal gain setting amplifier and a DTMF generator that contains a tone burst counter for generating precise tone bursts and pauses. The call progress mode, when selected, allows the detection of call progress tones. A standard 6500/6800 series microprocessor interface allows access to an internal status register, two control registers, and two data registers. Input Configuration The input arrangement consists of a differential input operational amplifier and bias sources (VREF) for biasing the amplifier inputs at VDD/2. Provisions are made for the connection of a feedback resistor to the op-amp output (GS) for gain adjust-

The M-8880 is a complete DTMF Transmitter/Receiver that features adjustable guard time, automatic tone burst mode, call progress mode, and a fully compatible 6500/6800 microprocessor interface. The receiver portion is based on the industry standard M-8870 DTMF Receiver, while the transmitter uses a switched-capacitor digital-to-analog converter for low-distortion, highly accurate DTMF signaling. Tone bursts can be transmitted with precise timing by making use of the automatic tone burst mode. To analyze call progress tones, a call progress filter can be selected by an external microprocessor.

Figure 2 Block Diagram

40-406-00012, Rev. G


Page 1


Figure 3 Single-Ended Input Configuration

Figure 4 Differential Input Configuration

ment. In a single-ended configuration, the input pins should be connected as shown in Figure 3. Figure 4 shows the necessary connections for a differential input configuration. Receiver Section The low and high group tones are separated by applying the DTMF signal to the inputs of two sixth-orde

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