MT8888CE Mitel, MT8888CE Datasheet
MT8888CE
Available stocks
Related parts for MT8888CE
MT8888CE Summary of contents
Page 1
... Circuit OSC2 Bias Circuit Ref SS MT8888CE/CE-1 MT8888CC/CC-1 MT8888CS/CS-1 MT8888CN/CN-1 The receiver section is based upon the industry standard transmitter converter for low distortion, high accuracy DTMF signalling. Internal counters provide a burst mode such that tone bursts can be transmitted with precise timing ...
Page 2
MT8888C/MT8888C IN IN VRef VSS 15 OSC1 6 14 OSC2 7 13 TONE 8 R PIN CERDIP/PLASTIC DIP/SOIC Pin Description Pin # Name ...
Page 3
Functional Description The MT8888C/MT8888C-1 Integrated Transceiver consists of a high performance DTMF receiver with an internal gain setting amplifier and a DTMF generator which employs a burst counter to synthesize precise tone bursts and pauses. A call progress mode can ...
Page 4
MT8888C/MT8888C-1 Following the filter section is a decoder employing digital counting techniques to frequencies of the incoming tones and to verify that they correspond to standard DTMF frequencies. A complex averaging algorithm protects against tone simulation by extraneous signals such ...
Page 5
selected by the designer. Different steering arrangements may be used to select independent tone present (t tone absent (t ) guard times. This may be GTA necessary to meet system specifications which place both accept ...
Page 6
MT8888C/MT8888C-1 EXPLANATION OF EVENTS A) TONE BURSTS DETECTED, TONE DURATION INVALID, RX DATA REGISTER NOT UPDATED. B) TONE #n DETECTED, TONE DURATION VALID, TONE DECODED AND LATCHED IN RX DATA REGISTER. C) END OF TONE #n DETECTED, TONE ABSENT DURATION ...
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
MT8888C/MT8888C-1 The Fourier components of correspond to V .... V as measured on the output 2f nf waveform. The total harmonic distortion for a dual tone can be calculated using Equation 2. V correspond to the low group amplitude and ...
Page 9
BIT NAME b0 TOUT Tone Output Control. A logic high enables the tone output; a logic low turns the tone output off. This bit controls all transmit tone functions. b1 CP/DTMF Call Progress or DTMF Mode Select. A logic high ...
Page 10
MT8888C/MT8888C-1 BIT NAME b0 IRQ b1 TRANSMIT DATA REGISTER EMPTY (BURST MODE ONLY) b2 RECEIVE DATA REGISTER FULL b3 DELAYED STEERING 8031/8051 8080/8085 Figure 12 - MT8888C Interface Connections for Various Intel Micros C1 R1 DTMF/CP INPUT R2 X-tal DTMF ...
Page 11
MMD6150 (or equivalent) TEST POINT 130 Test load for D0-D3 pins 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 ...
Page 12
MT8888C/MT8888C-1 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 ...
Page 13
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 7 ...
Page 14
MT8888C/MT8888C-1 AC Electrical Characteristics Characteristics 1 Accept Bandwidth 2 Lower freq. (REJECT) 3 Upper freq. (REJECT) 4 Call progress tone detect level (total power) † Characteristics are over recommended operating conditions unless otherwise stated ‡ Typical figures are at 25°C, ...
Page 15
AC Electrical Characteristics Characteristics 1 RD/WR clock frequency 2 RD/WR cycle period 3 RD/WR rise and fall time 4 Address setup time 5 Address hold time 6 Data hold time (read valid data delay (read) 8 RD, ...
Page 16
MT8888C/MT8888C-1 RD/WR RD CS, RS0 DATA BUS Figure 17 - 8031/8051/8085 Read Timing Diagram RD CS, RS0 DATA BUS Figure 18 - 8031/8051/8085 Write Timing Diagram 4-106 t CYC PWH t PWL Figure 16 - ...