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參數(shù)資料
| 型號(hào)： | HM9270C |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | DTMF Receiver(集成了濾波器和數(shù)字譯碼器功能的雙音多頻（DTMF）接收器) |
| 中文描述： | 雙音多頻接收器（集成了濾波器和數(shù)字譯碼器功能的雙音多頻（DTMF）的接收器） |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大小： | 57K |
| 代理商： | HM9270C |
DTMF RECEIVER
HM 9270C/D
— 6 —
The HM9270C/D monolithic DTMF receiver offers small size, low power consumption and high performance.
Its architecture consists of a bandsplit filter section, which separates the high and low tones of receiver pair,
followed by a digital counting section which verifies the frequency and duration of the received tones before
passing the corresponding code to the output bus.
FILTER SECTION
Separation of the low-group and high-group tones is achieved by applying the dual tone signal to the inputs
of two filters a sixth order for the high group and an eighth order for the low group. The bandwidths of
which correspond to the bands enclosing the low-group and high-group tones (see Fig. 4). The filter
section also in corporates notches at 350Hz and 440 Hz for exceptional dial-tone rejection. Each filter
output is followed by a second-order switched-capacitor section which smooths the signals prior to limiting.
Limiting is performed by high-gain comparators which are provided with hysteresis to prevent detection of
unwanted low-level signals and noise; the outputs of the comparators provide full-rail logic swings at the
frequencies of the incoming tones.
Flow Fhigh KEY TOE Q4
697 1209 1 H
697 1336 2 H
697 1477 3 H
770 1209 4 H
770 1336 5 H
770 1477 6 H
852 1209 7 H
852 1336 8 H
852 1477 9 H
941 1336 0 H
941 1209
H
941 1477 # H
697 1633 A H
770 1633 B H
852 1633 C H
941 1633 D H
- - ANY L
L = LOGIC LOW , H = LOGIC HIGH, Z = HIGH
IMPEDANCE
Q3
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
Z
Q2
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
Z
Q1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Z
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
Z
FIGURE 4. LOGIC TABLE
FIGURE 3. SINGLE ENDED INPUT CONFIGURATION
Decoder Section
The decoder used digital counting techniques to
determine the frequencies of the limited tones and
to verify that they correspond to standard DTMF
frequencies. A complex averaging
algorithm(protects) against tone simulation by
extraneous signals, such as voice, while providing
tolerance to smalll frequency deviations and
variations. This averaging algorithm has been
developed to ensure an optimum combination of
immunity to “talk-off” and tolerance to the presence
of interfering signals (“third tones”) and noise.
When the detector recognizes the simultaneous
presence of two valid tones (referred to as “signal
condition” in some industry specifications), it raises
the “early steering”flag (ESt). Any subsequent loss
of signal condition will cause ESt to fall.
HM9270D
300
IN+
IN
GS
INH
PWDN
OSC1
OSC2
V
SS
TOE
StD
St/GT
ESt
K
100
NF
Q4
Q3
Q2
Q1
V
DD
V
REF
100
NF
100
100
3.58
MHz
K
K
5V
0.1
μ
f
Vin
5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HM9270D | 制造商:EMC 制造商全稱(chēng):ELAN Microelectronics Corp 功能描述:DTMF RECEIVER |
| HM92M | 制造商:HSMC 制造商全稱(chēng):HSMC 功能描述:PNP EPITAXIAL PLANAR TRANSISTOR |
| HM94 | 制造商:HSMC 制造商全稱(chēng):HSMC 功能描述:PNP EPITAXIAL PLANAR TRANSISTOR |
| HM965 | 制造商:HSMC 制造商全稱(chēng):HSMC 功能描述:NPN EPITAXIAL PLANAR TRANSISTOR |
| HM9-6516BB6129 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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