MT8870DE Zarlink Semiconductor, MT8870DE Datasheet

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MT8870DE

Manufacturer Part Number
MT8870DE
Description
Manufacturer
Zarlink Semiconductor
Datasheet

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Features
Applications
PWDN
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
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
IN +
IN -
GS
Power
Chip
OSC1
VDD
Chip
Bias
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Circuit
Bias
VSS
Tone
Filter
Dial
Copyright 1997-2006, Zarlink Semiconductor Inc. All Rights Reserved.
OSC2
High Group
Low Group
Figure 1 - Functional Block Diagram
Filter
Filter
to all
Chip
Clocks
Zarlink Semiconductor Inc.
Zero Crossing
Detectors
VRef
Buffer
VRef
1
ISO
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
the decoder uses digital counting techniques to detect
and decode all 16 DTMF tone-pairs into a 4-bit code.
St/GT
2
-CMOS Integrated DTMF Receiver
MT8870DE
MT8870DS
MT8870DN
MT8870DSR
MT8870DNR
MT8870DN1
MT8870DE1
MT8870DS1
MT8870DNR1
MT8870DSR1
MT8870DE1-1
MT8870DS1-1
MT8870DSR1-1
St
GT
ESt
techniques
Detection
Algorithm
Digital
INH
Steering
Logic
Ordering Information
*Pb Free Matte Tin
-40°C to +85°C
18 Pin PDIP
18 Pin SOIC
20 Pin SSOP
18 Pin SOIC
20 Pin SSOP
20 Pin SSOP*
18 Pin PDIP*
18 Pin SOIC*
20 Pin SSOP*
18 Pin SOIC*
18 Pin PDIP*
18 Pin SOIC*
18 Pin SOIC*
MT8870D/MT8870D-1
for high and low group filters;
STD
Converter
and Latch
Code
TOE
Tubes
Tubes
Tape & Reel
Tape & Reel
Tubes
Tubes
Tape & Reel
Tape & Reel
Tubes
Tubes
Tape & Reel
Tubes
Tubes
Data Sheet
October 2006
Q1
Q2
Q3
Q4

Related parts for MT8870DE

MT8870DE Summary of contents

Page 1

... MT8870DS MT8870DN MT8870DSR MT8870DNR MT8870DN1 MT8870DE1 MT8870DS1 MT8870DNR1 MT8870DSR1 MT8870DE1-1 MT8870DS1-1 MT8870DSR1-1 Description The MT8870D/MT8870D complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques the decoder uses digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code ...

Page 2

... MT8870D/MT8870D-1 18 VDD IN+ 17 St/GT IN- 16 ESt GS 15 StD VRef 14 INH PWDN OSC1 10 OSC2 TOE VSS Figure 2 - Pin Connections Description /2 is used to bias inputs at mid-rail (see Fig Zarlink Semiconductor Inc. Data Sheet 1 20 VDD 2 19 St/ ESt 17 4 StD TOE 20 PIN SSOP ...

Page 3

... X MT8870D/MT8870D-1 Description frees the device to accept a new tone pair. The GT output acts to TSt 1kHz FREQUENCY (Hz) Figure 3 - Filter Response 3 Zarlink Semiconductor Inc. Data Sheet detected at TSt PRECISE DIAL TONES X=350 Hz Y=440 Hz DTMF TONES A=697 Hz B=770 Hz C=852 Hz D=941 Hz E=1209 Hz F=1336 Hz G=1477 Hz H=1633 Hz ...

Page 4

... Figure 4 is applicable. Component values are chosen according to the formula: MT8870D/MT8870D St/ ESt R StD MT8870D/ t =(RC)In(V GTA DD t =(RC)In[V GTP DD Figure 4 - Basic Steering Circuit ), v reaches the threshold ( the steering logic to register the tone pair, c TSt REC DP GTP GTA 4 Zarlink Semiconductor Inc. Data Sheet /V ) TSt /( TSt ...

Page 5

... GTA Figure 5 - Guard Time Adjustment TOE INH ESt undetected, the output code will remain the same as the previous detected code Table 1 - Functional Decode Table 5 Zarlink Semiconductor Inc. Data Sheet - TSt /V ) TSt + <t ) GTP GTA - TSt /V ) TSt + >t ) GTP GTA ...

Page 6

... MT8870D/MT8870D-1 improves talk-off performance since it reduces the REC would be appropriate for extremely noisy environments where fast acquisition 6 Zarlink Semiconductor Inc. Data Sheet ) and GTP 1 biasing the input at ...

Page 7

... All capacitors are ±5% tolerance. R =60kΩ, R =37.5 kΩ VOLTAGE GAIN (A diff INPUT IMPEDANCE INDIFF ωc 1 Figure 6 - Differential Input Configuration To OSC1 of next C MT8870D/MT8870D-1 X-tal OSC2 OSC1 OSC2 OSC1 C C=30 pF X-tal=3.579545 MHz Figure 7 - Oscillator Connection 7 Zarlink Semiconductor Inc. Data Sheet MT8870D/ MT8870D ...

Page 8

... Figure 8 - Non-Symmetric Guard Time Circuit MT8870D/MT8870D-1 Unit Resonator R1 Ohms ∆ =(R C )In[V /(V GTP =(R C )In(V GTA =( St/ Notes: 2 =368 K Ω ± ESt =2.2 M Ω ± =100 nF ± Zarlink Semiconductor Inc. Data Sheet 10.752 .432 4.984 37.915 896.37 ±0.2% and C are the guard TSt / TSt )/( ...

Page 9

... MT8870D-1 1 IN+ IN Ref INH PWDN OSC OSC Figure 9 - Single-Ended Input Configuration for BT or CEPT Spec St/GT R ESt 3 StD TOE 9 Zarlink Semiconductor Inc. Data Sheet NOTES: = 102 KΩ ± 71.5 KΩ ± 390 KΩ ± 100 nF ± 3.579545 MHz ± 0. 5.0 V ± ...

Page 10

... SS O ‡ Sym. Min. Typ DDQ 2.2 2.4 TSt 10 Zarlink Semiconductor Inc. Data Sheet Min. Max -0 -65 +150 500 ) unless otherwise stated. SS Max. Units Test Conditions 5.25 V °C +85 MHz % Max. Units Test Conditions µA 25 PWDN fc=3.579545 MHz ...

Page 11

... SS O ‡ Sym. Min. Typ. Max. I 100 PSRR 50 CMRR VOL 100 2 Zarlink Semiconductor Inc. Data Sheet Max. Units Test Conditions +0 load load mA V =0.4 V OUT mA V =4.6 V OUT 2 load 5.0V DD kΩ Units Test Conditions ≤ V ≤ MΩ kHz 0.75 V ≤ V ≤ ...

Page 12

... T ≤ +85°C, using Test Circuit shown in Figure 10. -V =5.0V 5 ‡ Sym. Min. Typ. -29 27.5 ±1.5% ± ±3.5% -16 -12 +22 ± 2%. 12 Zarlink Semiconductor Inc. Data Sheet Max. Units Notes* +1 dBm 1,2,3,5,6,9 869 mV 1,2,3,5,6,9 RMS 8 dB 2,3,6,9, 2,3,6,9,12 2,3,5,9 2,3,5,9 dB 2,3,4,5,9,10 ...

Page 13

... T -V =5.0V 5 ‡ Sym. Min. Typ. -31 21.8 -37 10.9 ±1.5%± ±3.5% -18.5 -12 +22 ± 2%. 13 Zarlink Semiconductor Inc. Data Sheet ≤ +85°C, using Test Circuit shown in Figure 10. Max. Units Notes* +1 dBm Tested 869 mV RMS 1,2,3,5,6,9 dBm Tested RMS ...

Page 14

... PStD t QStD t PTE t PTD 3.575 LHCL t HLCL equals time from PDWN going low until ESt going high. 14 Zarlink Semiconductor Inc. Data Sheet ‡ Typ. Max. Units Conditions Note 1 4 8.5 ms Note Note 2 ms Note Note 2 ms Note 2 µ TOE=V DD µ TOE=V DD µ ...

Page 15

... MT8870D/MT8870D DTMF Input R 1 MT8870D/MT8870D-1 IN+ IN Ref INH PDWN OSC 1 X-tal OSC Figure 10 - Single-Ended Input Configuration St/ ESt StD Q4 Q3 NOTES TOE C X-tal=3.579545 MHz ± 0.1% 15 Zarlink Semiconductor Inc. Data Sheet =100 KΩ ± =300 KΩ ± =100 nF ± ...

Page 16

... TIME TO DETECT THE ABSENCE OF VALID DTMF SIGNALS GUARD TIME, TONE PRESENT. GTP t GUARD TIME, TONE ABSENT. GTA MT8870D/MT8870D REC ID TONE TONE # GTA GTP QStD # n t PSrD -Q TO ITS HIGH IMPEDANCE STATE Figure 11 - Timing Diagram 16 Zarlink Semiconductor Inc. Data Sheet TONE # TSt HIGH IMPEDANCE # ( PTE t PTD ...

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Page 19

... For more information about all Zarlink products Information relating to products and services furnished herein by Zarlink Semiconductor Inc. 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 ...

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