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Número de pieza | 75T203 | |
Descripción | (75T202 / 75T203) 5V Low Power DTMF Receiver | |
Fabricantes | TDK | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de 75T203 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
No Preview Available ! taSheet4U.com D5TVML7F5oTRw2e-0Pc2eo/iw2v0ee3rrDESCRIPTION
aThe 75T202 and 75T203 are complete Dual-tone
.DMultifrequency (DTMF) receivers detecting a
wselectable group of 12 or 16 standard digits. No
wfront-end pre-filtering is needed. The only externally
wrequired components are an inexpensive 3.58 MHz
television “colorburs” crystal (for frequency
mreference) and a bias resistor. Extremely high
osystem density is made possible by using the clock
output of a crystal-connected 75T202 or 75T203
.creceiver to drive the time bases of additional
receivers. Both are monolithic integrated circuits
fabricated with low-power, complementary symmetry
UMOS (CMOS) processing. They require only a single
low tolerance voltage supply and are packaged in a
t4standard 18-pin plastic DIP.
(continued)
FEATURES
February 1998
• Central office quality
• NO front-end band-splitting filters required
• Single, low-tolerance, 5-volt supply
• Detects either 12 or 16 standard DTMF digits
• Uses inexpensive 3.579545 MHz crystal for
reference
• Excellent speech immunity
• Output in either 4-bit hexadecimal code or binary
coded 2-of-8
• 18-pin DIP package for high system density
• Synchronous or handshake interface
• Three-state outputs
• Early detect output (75T203 only)
eeBLOCK DIAGRAM
taShANALOG
PRE-PROCESSOR
60 Hz
REJECT
PREEMP
w.DaATB
XEN
wXIN
w m1Mz
U.coXOUT
÷8
BAND
SPLIT
FILTERS
BS1
ZERO
CROSSING
DETECTORS
BS2
CLOCK
GENERATOR
BANDPASS FILTERS
697
770
852
941
1209
1336
1477
1633
CHIP CLOCKS
AMPLITUDE
DETECTORS
TIMING
CIRCUITRY
DV
DATA STROBE
CLR
DV
F.F.
OUTPUT
DECODER
OUTPUT
REGISTER
eet4POWER REGULATOR
www.DataShVP GND GND
VOLTAGE
REF
DATA CLEAR
IN1633
ED 75T203
CLRDV
DV
HEX/B28
D1
D2
D4
D8
EN
1 page 75T202/203
5V Low-Power
DTMF Receiver
ELECTRICAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
(Operation above absolute maximum ratings may damage the device. All 75T202/203 unused inputs must be
connected to VP or GND, as appropriate.)
PARAMETER
DC Supply Voltage - VP
Operating Temperature
Storage Temperature
Power Dissipation (25°C)
Input Voltage (All inputs except ANALOG IN)
ANALOG IN Voltage
DC Current into any Input
Lead Temperature - Soldering, 10 sec.
RATING
+7V
-40°C to +85°C Ambient
-65°C to +150°C
65mW
(VP + .5V) to -.5V
(VP + .5V) to (VP - 10V)
±1.0mA
300°C
ELECTRICAL CHARACTERISTICS
(-40°C ² TA ² +85°C, VP = 5V ± 10%)
PARAMETER
Frequency Detect Bandwidth
Amplitude for Detection
CONDITIONS
each tone
Twist Tolerance
Twist = High Tone
Low Tone
60-Hz Tolerance
Dial Tone Tolerance
“precise” dial tone
Talk Off
MITEL tape #CM 7290
Digital Outputs
“0” level, 400µA load
(except XOUT)
“1” level, 200µA load
Digital Inputs
“0” level
“1” level
Power Supply Noise
wide band
Supply Current
TA = 25°C
Noise Tolerance
MITEL tape #CM 7290
Input Impedance
VP³VIN³VP-10
* dB referenced to lowest amplitude tone
MIN
±(1.5+2Hz)
-32
-10
TYP
±2.3
0
VP-0.5
0
0.7VP
2
10
100kΩ||15pF
MAX
±3.5
-2
+10
UNITS
% of fO
dBm ref.
to 600Ω
dB
0.8
0dB
0.5
VP
0.3VP
VP
10
16
-12
Vrms
dB*
hits
V
V
V
V
mV p-p
mA
dB*
5
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet 75T203.PDF ] |
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