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零件编号 | M-8870-01SM | ||
描述 | DTMF Receiver | ||
制造商 | Clare Inc. | ||
LOGO | |||
1 Page
Features
• 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
• Telephone switch equipment
• Remote data entry
• Paging systems
• Personal computers
• Credit card systems
Pin Configuration
Block Diagram
M-8870
DTMF Receiver
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. Its filter section uses switched capacitor
technology for both the high and low group filters and
for dial tone rejection. Its decoder uses digital counting
techniques 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 inter-
face bus. Minimal external components required
include a low-cost 3.579545 MHz color burst crystal, a
timing resistor, and a timing capacitor.
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 Tone Decoding
table on page 5).
Ordering Information
Part #
M-8870-01
Description
18-pin plastic DIP
M-8870-01SM 18-pin plastic SOIC
M-8870-01SMTR 18-pin plastic SOIC, tape and reel
M-8870-02
18-pin plastic DIP, power-down,
option
M-8870-02SM
18-pin plastic SOIC, power-down,
option
M-8870-02T
18-pin plastic SOIC, power-down
option, tape and reel
DS-M8870-R3
www.clare.com
1
M-8870
Figure 9 Mechanical Dimensions
Tolerances for 18 - pin Dip
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 for 18 - pin Dip
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
Dimensions
mm
(inches)
8
www.clare.com
Rev. 3
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页数 | 9 页 | ||
下载 | [ M-8870-01SM.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
M-8870-01SM | DTMF Receiver | Clare Inc. |
M-8870-01SMTR | DTMF Receiver | Clare Inc. |
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