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PDF M8870 Data sheet ( Hoja de datos )
| Número de pieza | M8870 | |
| Descripción | DTMF Receiver | |
| Fabricantes | Clare | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de M8870 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
www.clare.com
1 page  
M-8870
Table 5 Tone Decoding
FLOW
FHIGH
Key (ref.)
OE
Q4
Q3
Q2
Q1
697 1209
1
H
0
0
0
1
697 1336
2
H
0
0
1
0
697 1477
3
H
0
0
1
1
770 1209
4
H
0
1
0
0
770 1336
5
H
0
1
0
1
770 1477
6
H
0
1
1
0
852 1209
7
H
0
1
1
1
852 1336
8
H
1
0
0
0
852 1477
9
H
1
0
0
1
941 1336
0
H
1
0
1
0
941 1209
F
H
1
0
1
1
941 1477
#
H
1
1
0
0
697 1633
A
H
1
1
0
1
770 1633
B
H
1
1
1
0
852 1633
C
H
1
1
1
1
941 1633
D
H
0
0
0
0
ANY
ANY
ANY
L
Z
Z
Z
Z
L = logic low, H = logic high, Z = high impedance
Figure 6 Differential Input Configuration
Ordering Information
M-8870-01
M-8870-01SM
M-8870-01SMTR
M-8870-02P
M-8870-02S
M-8870-02T
18-pin plastic DIP
18-pin plastic SOIC
18-pin plastic SOIC, tape and reel
18-pin plastic DIP, power-down
option
18-pin plastic SOIC, power-down
option
18-pin plastic SOIC, power-down
option, tape and reel
Figure 7 Common Crystal Connection
40-406-00011, Rev. F
Page 5
www.clare.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet M8870.PDF ] | |
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