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PDF ( 数据手册 , 数据表 ) M-8870

零件编号 M-8870
描述 DTMF Receiver
制造商 Clare
LOGO Clare LOGO 


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M-8870 数据手册, 描述, 功能
M-8870 DTMF Receiver
Low power consumption
· Adjustable acquisition and release times
· Central office quality and performance
· Power-down and inhibit modes (-02 only)
· Inexpensive 3.58 MHz time base
· Single 5 volt power supply
· Dial tone suppression
·· Applications include: telephone switch equipment,
remote data entry, paging systems, personal
computers, credit card systems
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 tech-
nology, the M-8870 offers low power consumption (35 mW max)
and precise data handling. Its filter section uses switched ca-
pacitor technology for both the high and low group filters and
for dial tone rejection. Its decoder uses digital counting tech-
niques to detect and decode all 16 DTMF tone pairs into a 4-
bit code. External component count is minimized by provision
of an on-chip differential input amplifier, clock generator, and
latched tri-state interface bus. Minimal external components
required include a low-cost 3.579545 MHz color burst crystal,
a timing resistor, and a timing capacitor.
Figure 1 Pin Connections
The M-8870-02 provides a “power-down” option which, when
enabled, drops consumption to less than 0.5 mW.The M-8870-
02 can also inhibit the decoding of fourth column digits (see
Table 5).
40-406-00011, Rev. F
Figure 2 Block Diagram
Page 1
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M-8870 pdf, 数据表
M-8870
Tolerances
Inches
Metric (mm)
Min Max Min Max
A .210
5.33
A1 .015
.38
b .014
.022
.36
.56
b2 .045
.070
1.1
1.7
C .008
.014
.20
.36
D .880
.920 23.35 23.37
E .300
.325
7.62
8.26
E1 .240
.280
6.10
7.11
e .100 BSC
2.54 BSC
ec 0° 15° 0° 15°
L .115
.150
2.92
3.81
Tolerances
Inches
Metric (mm)
Min Max Min Max
A .0926 .1043 2.35 2.65
A1 .0040 .0118
.10
.30
b .013 .020 .33 .51
D .4469 .4625 11.35 11.75
E .2914 .2992
7.4
7.6
e .050 BSC
1.27 BSC
H .394
.419 10.00 10.65
L .016
.050
.40 1.27
. Figure 9 Package Dimensions
40-406-00011, Rev. F
Page 8
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