MT8880CS Zarlink Semiconductor, MT8880CS Datasheet
MT8880CS
Available stocks
Related parts for MT8880CS
MT8880CS Summary of contents
Page 1
... Ref SS ISO DS5431 MT8880CE MT8880CS MT8880CN MT8880CP Zarlink Semiconductor ISO which provides low power dissipation and high reliability. The DTMF receiver is based upon the industry 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 fi ...
Page 2
MT8880C ISO -CMOS 1 20 IN+ VDD 2 19 IN- St/ ESt 17 VRef VSS D2 15 OSC1 OSC2 7 D0 TONE 13 8 IRQ/CP Φ2 R ...
Page 3
Functional Description The MT8880C Integrated DTMF 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 call ...
Page 4
MT8880C ISO -CMOS 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. ...
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 ISO -CMOS 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 ...
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 ISO -CMOS 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 ISO -CMOS 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 ...
Page 11
C1 R1 DTMF/CP INPUT R2 R5 X-tal DTMF OUTPUT Notes: R1 100 kΩ 374 kΩ 3.3 kΩ 10 4.7 MΩ 10 Ω (min.) R ...
Page 12
MT8880C ISO -CMOS 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 ...
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 ISO -CMOS 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 ...
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 ° ‡ ...
Page 16
MT8880C ISO -CMOS 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 ...
Page 17
R Φ2 Φ RS0 RWS R/W DATA BUS Φ RS0 t RWS R/W DATA BUS ISO t CYC Figure 17 - Φ2 Pulse t DDR t ...
Page 18
...
Page 19
...
Page 20
...
Page 21
...
Page 22
... For more information about all Zarlink products Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use ...
Page 23
...
Page 24
...
Page 25
...
Page 26
...
Page 27
... For more information about all Zarlink products Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use ...