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부품번호 | 75T2090-IP 기능 |
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기능 | DTMF Transceivers | ||
제조업체 | ETC | ||
로고 | |||
전체 9 페이지수
DESCRIPTION
TDK Semiconductor’s 75T2089/2090/2091 are
complete Dual-Tone Multifrequency (DTMF)
Transceivers that can both generate and detect all
16 DTMF tone-pairs. These ICs integrate the
performance-proven 75T202 DTMF receiver with a
DTMF generator circuit.
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.
An additional feature of the 75T2090/2091 is
"imprecise" call progress detector. The detector
detects the presence of signals in the 305-640 Hz
band.
(continued)
75T2089/2090/2091
DTMF Transceivers
FEATURES
April 2000
• DTMF Generator and Receiver on one-chip
• Call progress detection (2090/2091 only)
• Early detect output (2091 only)
• DTMF Receiver exhibits excellent speech
immunity
• Analog input range from -32 to -2 dBm
(ref 600Ω )
• Three-state outputs (4-bit hexadecimal) from
DTMF Receiver
• AC coupled, internally biased analog input
• Latched DTMF Generator inputs
• DTMF output typ. -8 dBm (Low Band) and
-5.5 dBm (High Band)
• Easy interface for microprocessor dialing
• Uses inexpensive 3.579545 MHz crystal for
reference
• Low-power 5 volt CMOS
BLOCK DIAGRAM
LIN
(2090/2091 only)
D7
D6
D5
D4
Vp
LATCH
Vp
RESET
DIN
XIN
DQ
DQ
DQ
DQ
CK
RS
X1
XOUT
XEN ATB
Vp
8
BANDSPLIT
FILTERS
INTERNAL
CLOCK
ENERGY
DETECTOR
Vp
DTMF
GENERATOR
CK Q
Vp D CLR
BANDPASS
FILTERS
BANDPASS
FILTERS
697
BS1 770
852
AMPLITUDE
DETECTORS
TIMING
CIRCUITRY
941
1209
BS2 1336
DV
STROBE
DV
F.F.
1477
1633
POWER REGULATOR
VOLTAGE
REF
OUTPUT
DECODER
AND
REGISTER
Vp Vn
DE
DET
(2090/2091 only)
DTMF
OUT
ED
(2091 only)
DV
D3
D2
D1
D0
75T2089/2090/2091
DTMF Transceivers
DTMF OUT
The output amplitude characteristics listed in the
specifications are given for a supply voltage of 5.0V.
However, the output level is directly proportional to
the supply, so variations in it will affect the DTMF
output. A recommended line interface for this output
is shown in Figure 5.
CALL PROGRESS DETECTION
(75T2090/2091)
The 75T2090/2091 have a Call Progress Detector
that consists of a bandpass filter and an energy
detector for turning the on/off cadences into a
microprocessor compatible signal.
DET OUTPUT (75T2090/2091)
The output is TTL compatible and will be of a
frequency corresponding to the various candences
of Call Progress signals such as: on 0.5 sec/off 0.5
sec for a busy tone, on 0.25 sec/off 0.25 sec for a
reorder tone and on 0.8-1.2 sec/off 2.7-3.3 sec for
an audible ring tone.
LIN INPUT (75T2090/2091)
This analog input accepts the call progress signal
and should be used in the same manner as the
receiver input DIN.
DTMF
OUT
1:1
100Ω
TIP
RING
FIGURE 5: DTMF Output
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Operating above absolute maximum ratings may damage the device.
PARAMETER
DC Supply Voltage (Vp - Vn)
Voltage at any Pin (Vn = 0)
DIN Voltage
Current through any Protection Device
Operating Temperature Range
Storage Temperature
RATING
+7V
-0.3 to Vp + 0.3V
Vp + 0.5 to Vp - 10V
=20mA
-40 to + 85°C
-65 to 150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Supply Voltage
Power Supply Noise (wide band)
Ambient Temperature
CONDITIONS
Crystal Frequency
(F Nominal = 3.579545MHz)
Crystal Shunt Resistor
DTMF OUT Load Resistance
MIN
4.5
-40
-0.01
NOM
MAX
5.5
10
+85
+0.01
UNIT
V
mVp-p
°C
%
0.8 1.2 MΩ
100 Ω
4
4페이지 75T2089/2090/2091
DTMF Transceivers
CALL PROGRESS DETECTOR: Electrical Characteristics (Continued)
PARAMETER
TON Signal Time for Detect
TON Signal Time for No Detect
TOFF Interval Time for Detect
TOFF Interval Time for No Detect
TD2 Detect Time
TR2 Release Time
CONDITIONS
MIN
40
NOM MAX
10
40
20
40
40
UNIT
ms
ms
ms
ms
ms
ms
TON
TOFF
tone burst 1
DIN
TD1
TR1
tone burst 2
DV
TSU1
D0, D1, D2, D3
TED
*ED
TER
THD1
*75T2091 only
FIGURE 6: DTMF Decoder
TON
TOFF
tone burst 1
DIN
TD1
TR1
DV
TSU1
D0, D1, D2, D3
tone burst 2
THD1
FIGURE 7: Call Progress Detector
(75T2090/2091 only)
D4, D5, D6, D7
LATCH
RESET
DTMF OUT
THD2
TSU2
TPW
TPW
TSTART
(SEE NOTE)
TRP
NOTE: THE INDICATED TIME MAY BE AS SMALL AS 0 SEC., MEANING THAT THE
LATCH AND RESET LINES MAY BE TIED TOGETHER.
FIGURE 8: DTMF Generator
7
7페이지 | |||
구 성 | 총 9 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
75T2090-IP | DTMF Transceivers | ETC |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |