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參數資料
| 型號： | 75T204 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 5V Low-Power Subscriber DTMF Receiver |
| 中文描述： | 5V的低功耗用戶的DTMF接收器 |
| 文件頁數： | 1/9頁 |
| 文件大?。?/td> | 63K |
| 代理商： | 75T204 |
75T204
5V Low-Power Subscriber
DTMF Receiver
April 2000
DESCRIPTION
The 75T204 is a complete Dual-Tone Multifrequency
(DTMF) receiver that detects 16 standard digits. No
front-end pre-filtering is needed. The only external
components required are an inexpensive 3.58-MHz
television “colorburst” crystal for frequency reference
and a bias resistor. An Alternate Time Base (ATB)
is provided to permit operation of up to 10 75T204's
from a single crystal. The 75T204 employs state-of-
the-art
"switched-capacitor"
resulting in approximately 40 poles of filtering, and
digital circuitry on the same CMOS chip. The analog
input signal is pre-processed by 60-Hz reject and
band split filters and then zero-cross detected to
provide AGC. Eight bandpass filters detect the
individual tones. Digital processing is used to
measure the tone and pause durations
filter
technology,
(continued)
FEATURES
Intended for applications with less
requirements than the 75T202/75T203
14-pin plastic DIP or 16-pin SO package for
high system density
NO front-end band-splitting filters required
Single low-tolerance 5-volt supply
Detects all 16 standard DTMF digits.
Uses an inexpensive 3.579545-MHz crystal
Excellent speech immunity
Output in 4-bit hexadecimal code
Three-state outputs for microprocessor
interface
BLOCK DIAGRAM
ANALOG
PRE-PROCESSOR
BAND
SPLIT
FILTERS
BS1
852
770
697
941
1209
1336
1477
1633
CRZERO
DETECTORS
BANDPASS FILTERS
AMPLITUDE
DETECTORS
DATA STROBE
DV
CTIMING
OUTPUT
DATA CLEAR
BS2
OUTPUT
REGISTER
D1
DV
D2
D4
D8
EN
ATB
XEN
CHIP CLOCKS
XIN
XOUT
1Mz
VP
GND
POWER REGULATOR
VOLTAGE
REF
60 Hz
REJECT
PREEMP
GECLOCK
÷ 8
相關PDF資料 |
PDF描述 |
|---|---|
| 75T204-IL | 5V Low-Power Subscriber DTMF Receiver |
| 75T204-IP | 5V Low-Power Subscriber DTMF Receiver |
| 75T2091-IP | DTMF TRANSCEIVERS |
| 76253XXEN | SSR H/S ZS CS AR 4-32VDC 50A 600V OTP PNP NO |
| 76250EN | EN Approved Converter Transformers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 75T-204 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIMMER 200K |
| 75T204IL | 制造商:TDK 功能描述: |
| 75T204-IL | 制造商:TDK 功能描述: |
| 75T204-IP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:5V Low-Power Subscriber DTMF Receiver |
| 75T2089 | 制造商:TDK 制造商全稱:TDK Electronics 功能描述:DTMF Transceivers |
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