MT8880CP Mitel, MT8880CP Datasheet
MT8880CP
Available stocks
Related parts for MT8880CP
MT8880CP Summary of contents
Page 1
... 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. A call progress filter ...
Page 2
MT8880C/MT8880C IN+ VDD 2 19 IN- St/ ESt 17 VRef VSS D2 15 OSC1 6 D1 OSC2 TONE 8 IRQ/CP R ...
Page 3
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 ...
Page 4
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 ...
Page 5
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 ...
Page 6
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 ...
Page 7
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 ...
Page 8
MT8880C/MT8880C THD(%) = 100 V fundamental Equation 1. THD (%) For a Single Tone .... ...
Page 9
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 ...
Page 10
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 ...
Page 11
C1 R1 DTMF/CP INPUT R2 X-tal DTMF OUTPUT Notes: R1 100 374 3 (min 100 ...
Page 12
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. ...
Page 13
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 ...
Page 14
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 ...
Page 15
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 ...
Page 16
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 ...
Page 17
RS0 RWS R/W DATA BUS RS0 t RWS R/W DATA BUS 2 MT8880C/MT8880C-1 ISO -CMOS t CYC Figure Pulse ...
Page 18
MT8880C/MT8880C-1 NOTES: 4-50 2 ISO -CMOS ...