MT8889CSR

Manufacturer Part NumberMT8889CSR
DescriptionIntegrated DTMF Transceiver with Adaptive Micro Interface
ManufacturerZarlink Semiconductor, Inc.
MT8889CSR datasheet
 


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Features
Central office quality DTMF transmitter/
receiver
Low power consumption
High speed adaptive micro interface
Adjustable guard time
Automatic tone burst mode
Call progress tone detection to -30dBm
Applications
Credit card systems
Paging systems
Repeater systems/mobile radio
Interconnect dialers
Personal computers
Description
The MT8889C is a monolithic DTMF transceiver with
call progress filter.
It is fabricated in CMOS
technology offering low power consumption and high
reliability.
D/A
TONE
Converters
Tone Burst
Gating Cct.
IN+
+
Dial
Tone
-
High Group
IN-
Filter
GS
Low Group
OSC1
Oscillator
Circuit
OSC2
Bias
Circuit
V
V
V
DD
Ref
SS
DS5433
MT8889CE
MT8889CS
MT8889CN
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. A call progress filter can be selected allowing
a microprocessor to analyze call progress tones.
The MT8889C utilizes an adaptive micro interface,
which allows the device to be connected to a number
of popular microcontrollers with minimal external
logic.
Functional Description
The MT8889C Integrated DTMF Transceiver consists
of a high performance DTMF receiver with an
internal gain setting amplifier and a DTMF generator,
Row and
Transmit Data
Column
Register
Counters
Status
Register
Control
Logic
Control
Register
Digital
Filter
Algorithm
and Code
Control
Register
Converter
Filter
Control
Receive Data
Steering
Logic
Register
Logic
ESt
St/GT
Figure 1 - Functional Block Diagram
MT8889C
Integrated DTMF Transceiver
with Adaptive Micro Interface
ISSUE 7
Ordering Information
20 Pin Plastic DIP
20 Pin SOIC
24 Pin SSOP
-40 ° C to +85 ° C
MT8870
DTMF
receiver
while
utilizes
a
switched
capacitor
Data
Bus
Buffer
Interrupt
Logic
A
I/O
Control
B
March 2001
the
D/A
D0
D1
D2
D3
IRQ/CP
DS/RD
CS
R/W/WR
RS0
1

MT8889CSR Summary of contents

  • Page 1

    Features • Central office quality DTMF transmitter/ receiver • Low power consumption • High speed adaptive micro interface • Adjustable guard time • Automatic tone burst mode • Call progress tone detection to -30dBm Applications • Credit card systems • ...

  • Page 2

    MT8889C 20 1 IN+ VDD 2 19 IN- St/ ESt 17 VRef VSS D2 15 OSC1 OSC2 D0 7 TONE 13 8 IRQ/CP 12 R/W/WR 9 DS/ RS0 ...

  • Page 3

    A call progress mode can be selected so that frequencies within the specified passband can be detected. The adaptive micro interface allows microcontrollers, such as the 68HC11, 80C51 ...

  • Page 4

    MT8889C 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

    MT8889C 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

    MT8889C 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

    The adaptive micro interface provides access to five internal registers. The read-only Receive Data Register contains the decoded output of the last valid DTMF digit received. Data entered into the write-only Transmit Data Register will determine which tone pair is ...

  • Page 10

    MT8889C 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 ...

  • Page 11

    BIT NAME b0 IRQ b1 TRANSMIT DATA REGISTER EMPTY (BURST MODE ONLY) b2 RECEIVE DATA REGISTER FULL b3 DELAYED STEERING C1 R1 DTMF/CP INPUT R5 X-tal DTMF OUTPUT C4 R Notes: R1 100 kΩ 374 ...

  • Page 12

    MT8889C MMD6150 (or equivalent) TEST POINT 130 pF 24 kΩ 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 ...

  • 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

    MT8889C 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 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 ...

  • Page 16

    MT8889C AC Electrical Characteristics Characteristics 1 DS/RD/WR clock frequency 2 DS/RD/WR cycle period 3 DS/RD/WR low pulse width 4 DS/RD/WR high pulse width 5 DS/RD/WR rise and fall time 6 R/W setup time 7 R/W hold time 8 Address setup ...

  • Page 17

    DS Q clk* A0-A15 (RS0) R/W(read) Read Data (D3-D0) R/W (write) Write data (D3-D0 Q).Addr [MC6809 VMA.Addr [MC6800, MC6802] *microprocessor pin Figure 17 - MC6800/MC6802/MC6809 Timing Diagram ➀ from data to DS ...

  • Page 18

    MT8889C ALE P0* (RS0, A0-A7 D0-D3 (Addr ALE.Addr * microprocessor pins Figure 19 - 8031/8051/8085 Read Timing Diagram ALE P0* (RS0, D0-D3 (Addr ALE.Addr * microprocessor ...

  • Page 19

    Package Outlines Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 8-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.115 (2.92) ...

  • Page 20

    Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 22-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.125 (3.18) 0.195 ...

  • Page 21

    16-Pin DIM Min Max Min A 0.093 0.104 0.093 (2.35) (2.65) (2.35) A 0.004 0.012 0.004 1 (0.10) (0.30) (0.10) B 0.013 0.020 0.013 (0.33) (0.51) (0.33) C 0.009 0.013 0.009 (0.231) (0.318) (0.231) D 0.398 0.413 ...

  • Page 22

    Small Shrink Outline Package (SSOP Suffix Pin Notes: 1) Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) 4) Ref. JEDEC Standard M0-150/M0118 for 48 Pin 5) A ...

  • Page 23

    Package Outlines Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 8-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.115 (2.92) ...

  • Page 24

    Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 22-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.125 (3.18) 0.195 ...

  • Page 25

    16-Pin DIM Min Max Min A 0.093 0.104 0.093 (2.35) (2.65) (2.35) A 0.004 0.012 0.004 1 (0.10) (0.30) (0.10) B 0.013 0.020 0.013 (0.33) (0.51) (0.33) C 0.009 0.013 0.009 (0.231) (0.318) (0.231) D 0.398 0.413 ...

  • Page 26

    Small Shrink Outline Package (SSOP Suffix Pin Notes: 1) Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) 4) Ref. JEDEC Standard M0-150/M0118 for 48 Pin 5) A ...

  • Page 27

    ...

  • Page 28

    ...

  • Page 29

    Package Outlines Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 8-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.115 (2.92) ...

  • Page 30

    Notes Not to scale 2) Dimensions in inches 3) (Dimensions in millimeters) Plastic Dual-In-Line Packages (PDIP Suffix 22-Pin DIM Plastic Min Max A 0.210 (5.33) A 0.125 (3.18) 0.195 ...

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    ...

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    For more information about all Zarlink products visit our Web Site at www.zarlink.com ’ ’ “ ” ...