m-8870 Clare, Inc., m-8870 Datasheet
m-8870
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m-8870 Summary of contents
Page 1
... Pin Configuration Block Diagram DS-M8870-R3 Description The M-8870 is a full DTMF Receiver that integrates both bandsplit filter and decoder functions into a single 18-pin DIP or SOIC package. Manufactured using CMOS process technology, the M-8870 offers low power consumption (35 mW max) and precise data handling ...
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... M-8870 Absolute Maximum Ratings Parameter Symbol Power supply voltage ( Voltage on any pin V DC Current on any pin I DD Operating temperature T A Storage temperature T S Note: Exceeding these ratings may cause permanent damage. Functional operation under these conditions is not implied. ...
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... The comparator outputs provide full-rail logic swings at the frequencies of the incoming tones. Decoder The M-8870 decoder uses a digital counting tech- nique to determine the frequencies of the limited tones and to verify that they correspond to standard DTMF frequencies. A complex averaging algorithm is used to ...
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... M-8870 Pin Functions Pin Name 1 IN+ Non-inverting input 2 IN- Inverting input 3 GS Gain select. Gives access to output of front-end amplifier for connection of feedback resistor Reference voltage output (nominally VDD/2). May be used to bias the inputs at mid-rail. REF 5 INH* Inhibits detection of tones representing keys and D. ...
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... MHz television color burst crys- tal. The crystal can be connected to a single M-8870 as shown in the Single - Ended Input Configuration on page series of M-8870s. As illustrated in the Common Crystal Connection below, a single crystal can be used to connect a series of M-8870s by cou- pling the oscillator output of each M-8870 through capacitor to the oscillator input of the next M-8870 ...
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... M-8870 AC Characteristics Parameter Valid input signal levels (each tone of composite signal) Positive twist accept Negative twist accept Frequency deviation accept limit Frequency deviation reject limit Third tone tolerance Noise tolerance Dial tone tolerance Tone present detection time Tone absent detection time ...
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... Minimum time between valid DTMF signals Maximum allowable dropout during valid DTMF signal Time to detect the presence of valid DTMF signals Time to detect the absence of valid DTMF signals Guard time, tone present. GTP T Guard time, tone absent. GTA Rev. 3 www.clare.com M-8870 7 ...
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... M-8870 Figure 9 Mechanical Dimensions 8 Tolerances for 18 - pin Dip Inches Min Max A - .210 A1 .015 b .014 .022 b2 .045 .070 C .008 .014 D .880 .920 E .300 .325 E1 .240 .280 e .100 BSC ec 0° 15° L .115 .150 Tolerances for 18 - pin Dip Inches Min Max A .0926 .1043 A1 ...
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... Clare’s product may result in direct physical harm, injury, or death to a person or severe property or environmental damage. Clare, Inc. reserves the right to discontinue or make changes to its products at any time without notice. Specification: DS-M-8870-R3 ©Copyright 2001, Clare, Inc. All rights reserved. Printed in USA. 7/25/01 ...