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PDF 75T204-IL Data sheet ( Hoja de datos )
| Número de pieza | 75T204-IL | |
| Descripción | 5V Low-Power Subscriber DTMF Receiver | |
| Fabricantes | ETC | |
| Logotipo |  |
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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" filter technology,
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
(continued)
75T204
5V Low-Power Subscriber
DTMF Receiver
FEATURES
April 2000
• 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
60 Hz
REJECT
PREEMP
ATB
XEN
XIN
1Mz
XOUT
÷8
BAND
SPLIT
FILTERS
BS1
ZERO
CROSSING
DETECTORS
BANDPASS FILTERS
697
770
852
941
BS2
1209
1336
1477
CLOCK
GENERATOR
1633
CHIP CLOCKS
AMPLITUDE
DETECTORS
TIMING
CIRCUITRY
DV
DATA STROBE
OUTPUT
DECODER
OUTPUT
REGISTER
POWER REGULATOR
VP GND
VOLTAGE
REF
DATA CLEAR
DV
D1
D2
D4
D8
EN
1 page  
DETECTION FREQUENCY
Low Group f
0
Row 0 = 697 Hz
Row 1 = 770 Hz
Row 2 = 852 Hz
Row 3 = 941 Hz
75T204
5V Low-Power Subscriber
DTMF Receiver
High Group f
0
Column 0 = 1209 Hz
Column 1 = 1336 Hz
Column 2 = 1477 Hz
Column 3 = 1633 Hz
75T204 TIMING (Refer to Figure 4.)
PARAMETER
tON Tone Time
tOFF
Pause Time
tD Detect Time
tR Release Time
tSU Data Setup Time
tH Data Hold Time
Output Enable Time
Output Disable Time
Output Rise Time
Output Fall Time
CONDITIONS
for detection
for rejection
for detection
for rejection
CL = 50pF, RL = 1k½
C = 35pF, R = 500½
LL
CL = 50pF
C = 50pF
L
MIN NOM MAX UNITS
40 -
- ms
- - 20 ms
40 -
- ms
- - 20 ms
25 - 46 ms
35 - 50 ms
7 - - µs
4.2 - 5.0 ms
- - 200 ns
- - 200 ns
- - 200 ns
- - 200 ns
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet 75T204-IL.PDF ] | |
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