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What is MT8870D?

This electronic component, produced by the manufacturer "Zarlink Semiconductor", performs the same function as "Integrated DTMF Receiver".


MT8870D Datasheet PDF - Zarlink Semiconductor

Part Number MT8870D
Description Integrated DTMF Receiver
Manufacturers Zarlink Semiconductor 
Logo Zarlink Semiconductor Logo 


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MT8870D/MT8870D-1
ISO2-CMOS Integrated DTMF Receiver
Data Sheet
Features
October 2006
• Complete DTMF Receiver
• Low power consumption
• Internal gain setting amplifier
• Adjustable guard time
• Central office quality
• Power-down mode
• Inhibit mode
• Backward compatible with MT8870C/MT8870C-1
Applications
• Receiver system for British Telecom (BT) or
CEPT Spec (MT8870D-1)
• Paging systems
• Repeater systems/mobile radio
• Credit card systems
• Remote control
• Personal computers
• Telephone answering machine
Ordering Information
MT8870DE
18 Pin PDIP
MT8870DS
18 Pin SOIC
MT8870DN
20 Pin SSOP
MT8870DSR
18 Pin SOIC
MT8870DNR
20 Pin SSOP
MT8870DN1
20 Pin SSOP*
MT8870DE1
18 Pin PDIP*
MT8870DS1
18 Pin SOIC*
MT8870DNR1 20 Pin SSOP*
MT8870DSR1 18 Pin SOIC*
MT8870DE1-1 18 Pin PDIP*
MT8870DS1-1 18 Pin SOIC*
MT8870DSR1-1 18 Pin SOIC*
*Pb Free Matte Tin
-40°C to +85°C
Tubes
Tubes
Tubes
Tape & Reel
Tape & Reel
Tubes
Tubes
Tubes
Tape & Reel
Tape & Reel
Tubes
Tubes
Tape & Reel
Description
The MT8870D/MT8870D-1 is a complete DTMF
receiver integrating both the bandsplit filter and digital
decoder functions. The filter section uses switched
capacitor techniques for high and low group filters;
the decoder uses digital counting techniques to detect
and decode all 16 DTMF tone-pairs into a 4-bit code.
VDD VSS
VRef
INH
PWDN
IN +
IN -
GS
Bias
Circuit
Chip Chip
Power Bias
Dial
Tone
Filter
VRef
Buffer
High Group
Filter
Zero Crossing
Detectors
Low Group
Filter
Digital
Detection
Algorithm
Code
Converter
and Latch
to all
Chip
Clocks
St Steering
GT Logic
OSC1
OSC2
St/GT
ESt
Figure 1 - Functional Block Diagram
STD
TOE
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 1997-2006, Zarlink Semiconductor Inc. All Rights Reserved.
Q1
Q2
Q3
Q4

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MT8870D equivalent
MT8870D/MT8870D-1
Data Sheet
The value of tDP is a device parameter (see Figure 11) and tREC is the minimum signal duration to be recognized by
the receiver. A value for C of 0.1 µF is recommended for most applications, leaving R to be selected by the
designer.
VDD
St/GT
tGTP=(RPC1)In[VDD/(VDD-VTSt)]
tGTA=(R1C1)In(VDD/VTSt)
C1 RP=(R1R2)/(R1+R2)
R1 R2
ESt a) decreasing tGTP; (tGTP<tGTA)
VDD
St/GT
tGTP=(R1C1)In[VDD/(VDD-VTSt)]
tGTA=(RPC1)In(VDD/VTSt)
C1 RP=(R1R2)/(R1+R2)
R1 R2
ESt b) decreasing tGTA; (tGTP>tGTA)
Figure 5 - Guard Time Adjustment
Digit
ANY
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
D
A
B
C
D
TOE INH ESt Q4 Q3 Q2 Q1
L XHZ Z Z Z
HXH0 0 0 1
HXH0 0 1 0
HXH0 0 1 1
HXH0 1 0 0
HXH0 1 0 1
HXH0 1 1 0
HXH0 1 1 1
HXH1 0 0 0
HXH1 0 0 1
HXH1 0 1 0
HXH1 0 1 1
HXH1 1 0 0
HLH1 1 0 1
HLH1 1 1 0
HLH1 1 1 1
HLH0 0 0 0
HH L
H H L undetected, the output code
H
H
L
will remain the same as the
previous detected code
HH L
Table 1 - Functional Decode Table
L=LOGIC LOW, H=LOGIC HIGH, Z=HIGH IMPEDANCE
X = DON‘T CARE
5
Zarlink Semiconductor Inc.


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for MT8870D electronic component.


Information Total 19 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
MT8870The function is ISO2-CMOS Integrated DTMF Receiver. Mitel Networks CorporationMitel Networks Corporation
MT8870DThe function is Integrated DTMF Receiver. Zarlink SemiconductorZarlink Semiconductor
MT8870DThe function is Integrated DTMF Receiver. MitelMitel

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