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75T2091-IH PDF预览

75T2091-IH

更新时间: 2024-02-20 05:14:42
品牌 Logo 应用领域
东电化 - TDK 电信集成电路
页数 文件大小 规格书
9页 78K
描述
DTMF Transceivers

75T2091-IH 数据手册

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75T2089/2090/2091  
DTMF Transceivers  
April 2000  
DESCRIPTION  
FEATURES  
·
·
·
·
DTMF Generator and Receiver on one-chip  
Call progress detection (2090/2091 only)  
Early detect output (2091 only)  
TDK Semiconductor’s 75T2089/2090/2091 are  
complete  
Transceivers that can both generate and detect all  
16 DTMF tone-pairs. These ICs integrate the  
Dual-Tone  
Multifrequency  
(DTMF)  
DTMF Receiver exhibits excellent speech  
immunity  
performance-proven 75T202 DTMF receiver with a  
DTMF generator circuit.  
·
·
Analog input range from -32 to -2 dBm  
(ref 600W )  
Three-state outputs (4-bit hexadecimal) from  
DTMF Receiver  
AC coupled, internally biased analog input  
Latched DTMF Generator inputs  
The DTMF receiver electrical characteristics are  
identical  
to  
the  
standard  
75T202  
device  
characteristics.  
The DTMF generator provides  
performance similar to the Mostek MK5380, but with  
an improved (tighter) output amplitude range  
specification and with the addition of independent  
latch and reset controls.  
·
·
·
DTMF output typ. -8 dBm (Low Band) and  
-5.5 dBm (High Band)  
An additional feature of the 75T2090/2091 is  
"imprecise" call progress detector. The detector  
detects the presence of signals in the 305-640 Hz  
·
·
Easy interface for microprocessor dialing  
Uses inexpensive 3.579545 MHz crystal for  
reference  
band.  
(continued)  
·
Low-power 5 volt CMOS  
BLOCK DIAGRAM  
RS  
X
1
XIN  
XOUT  
XEN ATB  
Vp  
INTERNAL  
CLOCK  
8
BANDSPLIT  
FILTERS  
ENERGY  
DETECTOR  
LIN  
DET  
(2090/2091 only)  
(2090/2091 only)  
Vp  
D7  
D6  
D
Q
D
D
Q
Q
DTMF  
GENERATOR  
D5  
D4  
D
Q
CK  
Vp  
Vp  
DTMF  
OUT  
LATCH  
RESET  
CK  
Q
Vp  
D CLR  
BANDPASS  
FILTERS  
697  
770  
852  
941  
AMPLITUDE  
DETECTORS  
BANDPASS  
FILTERS  
DIN  
BS1  
ED  
(2091 only)  
TIMING  
CIRCUITRY  
DV  
STROBE  
DV  
F.F.  
1209  
1336  
1477  
1633  
DV  
BS2  
D3  
D2  
OUTPUT  
DECODER  
AND  
D1  
D0  
REGISTER  
VOLTAGE  
REF  
POWER REGULATOR  
Vp  
Vn  
DE  

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