MT8880CE-1 MITEL [Mitel Networks Corporation], MT8880CE-1 Datasheet
MT8880CE-1
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MT8880CE-1 Summary of contents
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... Bias Circuit Ref SS 2 ISO -CMOS MT8880CE/CE-1 MT8880CC/CC-1 MT8880CS/CS-1 MT8880CN/CN-1 MT8880CP/CP-1 based upon monolithic DTMF receiver; the transmitter utilizes a switched capacitor D/A converter for low distortion, high accuracy DTMF signalling. Internal counters provide a burst mode such that tone bursts can be transmitted with precise timing ...
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MT8880C/MT8880C IN+ VDD 2 19 IN- St/ ESt 17 VRef VSS D2 15 OSC1 6 D1 OSC2 TONE 8 IRQ/CP R ...
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Functional Description The MT8880C/C-1 Integrated DTMF Transceiver architecture consists of a high performance DTMF receiver with internal gain setting amplifier and a DTMF generator which employs a burst counter such that precise tone bursts and pauses can be synthesized. A ...
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MT8880C/MT8880C-1 Steering Circuit Before registration of a decoded tone pair, the receiver checks for a valid signal duration (referred to as character recognition condition). This check is performed by an external RC time constant driven by ESt. A logic high ...
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Increasing t improves talk-off performance since REC it reduces the probability that tones simulated by speech will maintain a valid signal condition long enough to be registered. Alternatively, a relatively short t with a long t would be appropriate for ...
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MT8880C/MT8880C-1 EVENTS A t REC V in ESt St/GT RX -RX DECODED TONE # (n- Read Status Register IRQ/CP of time segments is fixed at 32, however, by varying the segment length as described above the ...
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Burst Mode In certain telephony applications it is required that DTMF signals being generated are of a specific duration determined either by application or by any one of the exchange transmitter specifications currently existing. Standard DTMF signal timing can be ...
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MT8880C/MT8880C THD(%) = 100 V fundamental Equation 1. THD (%) For a Single Tone .... ...
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RS0 R/W FUNCTION 0 0 Write to Transmit Data Register 0 1 Read from Receive Data Register 1 0 Write to Control Register 1 1 Read from Status Register Table 2. Internal Register Functions BIT NAME FUNCTION b0 TOUT TONE ...
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MT8880C/MT8880C-1 BIT NAME FUNCTION b0 BURST BURST MODE b1 TEST TEST MODE b2 S/D SINGLE /DUAL TONE GENERATION b3 C/R COLUMN/ROW TONES BIT NAME b0 IRQ b1 TRANSMIT DATA REGISTER EMPTY (BURST MODE ONLY) b2 RECEIVE DATA REGISTER FULL b3 ...
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C1 R1 DTMF/CP INPUT R2 X-tal DTMF OUTPUT Notes: R1 100 374 3 (min 100 ...
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MT8880C/MT8880C-1 6802 IRQ Address VMA R/W E Data EXAMPLE 1: A software reset must be included at the beginning of all programs to initialize the control registers after power up. The initialization procedure should be implemented 100ms after power up. ...
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Absolute Maximum Ratings Parameter 1 Power supply voltage Voltage on any pin 3 Current at any pin (Except V DD and 4 Storage temperature 5 Package power dissipation * Exceeding these values may cause permanent ...
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MT8880C/MT8880C-1 Electrical Characteristics Gain Setting Amplifier - Voltages are with respect to ground (V Characteristics 1 Input leakage current 2 Input resistance 3 Input offset voltage 4 Power supply rejection 5 Common mode rejection 6 DC open loop voltage gain ...
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AC Electrical Characteristics Characteristics 1 Lower freq. (ACCEPT) 2 Upper freq. (ACCEPT) 3 Lower freq. (REJECT) 4 Upper freq. (REJECT) 5 Call progress tone detect level (total power) † Characteristics are over recommended operating conditions unless otherwise stated ‡ Typical ...
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MT8880C/MT8880C-1 AC Electrical Characteristics Characteristics 28 Data hold time (write) 29 Input Capacitance (data bus) 30 Output Capacitance (IRQ/CP) 31 Crystal/clock frequency Clock input rise time Clock input duty cycle C 34 Clock input ...
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RS0 RWS R/W DATA BUS RS0 t RWS R/W DATA BUS 2 MT8880C/MT8880C-1 ISO -CMOS t CYC Figure Pulse ...
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MT8880C/MT8880C-1 NOTES: 4-50 2 ISO -CMOS ...