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Teilenummer | SC9270D |
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Beschreibung | DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER | |
Hersteller | Silan Semiconductors | |
Logo | ||
Gesamt 12 Seiten SC9270
DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER
DESCRIPTION
The SC9270C/D is a complete DTMF receiver integrating both the
bandsplit filter and digital decoder functions. The filter section uses
switched capacitor techniques for high- and low-group filters and dial-
tone rejection. Digital counting techniques are employed in the decoder
to detect and decode all 16 DTMF tone-pairs into a 4-bit code. External
component count is minimized by on-chip provision of a differential
input amplifier, clock-oscillator and latched 3-state bus interface.
SOP-20-375-1.27
FEATURES
DIP-18-300-2.54
* Excellent performance
* CMOS, single 5 volt operation,
* Widely operating voltage: 1.2V ~ 5.25V
* Minimum board area
* Central office quality
* Low power consumption
* Power-Down mode (SC9270D only)
* Inhibit-mode (SC9270D only)
APPLICATIONS
* Paging systems
* Repeater systems / Mobile radio
* Credit card systems
* Remote control
* Personal computers
ORDERING INFORMATION
Device
SC9270C
SC9270D
SC9270DS
Package
DIP-18-300-2.54
DIP-18-300-2.54
SOP-20-375-1.27
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Downloaded from Elcodis.com electronic components distributor
REV:1.2 2005.03.24
Page 1 of 13
SC9270
(Continued)
Pin No.
SC9270C SC9270D SC9270DS
16 16 18
17 17 19
18 18 20
5, 6 --
--
-- -- 10, 11
Pin
Name
ESt
St/GT
VDD
IC*
NC
Description
Early steering output. Presents a logic high immediately when
the digital algorithm detects a recognizable tone-pair (signal
condition). Any momentary loss of signal condition will cause
ESt to return to a logic low.
Steering input/guard time output (bi-directional). A voltage
greater than VTSt detected at St causes the device to register
the detected tone-pair and update the output latch. A voltage
less than VTSt frees the device to accept a new tone-pair. The
GT output acts to reset the external steering time-constant; its
state is a function of ESt and the voltage on St.
Positive power supply.
Connect VSS
Not connect
TIMING DIAGRAM
D
EVENTS
Vin
ESt
St/GT
DATA
OUTPUTS
Q1 ~ Q4
StD
OUTPUT
TOE
A
tREC
B
tREC
TONE # n
tDP
C
tID
tDA
EF
G
tDO TONE DROPOUT
TONE # n+1
TONE # n+1
tGTP
tGTA
DECODED TONE # n -1
tPSTD
tPQ
DECODED TONE#n
HIGH IMPEDANCE
VTst
DECODED TONE # n+1
tPTE
tPTD
Figure 4. Timing diagram
EXPLANATION OF EVENTS
EXPLANATION OF SYMBOLS
A. Short tone bursts: detected. Tone duration is
invalid.
B. Tone #n is detected. Tone duration is valid.
Decoded to outputs.
C. End of tone #n is detected and validated.
D. 3 State outputs disabled (high impedance).
E. Tone #n + 1 is detected. Tone duration is valid.
Decoded to outputs.
F. Tristate outputs are enabled. Acceptable drop out
of tone #n + 1 does not register at outputs.
Vin: DTMF composite input signal.
tREC :Max. DTMF signal duration not detected as valid.
tREC: Minimum DTMF Signal duration required for
valid recognition.
tID: Minimum time between valid DTMF signals.
tDO: Max. allowable dropout during valid DTMF signal
tDP: Time to detect the presence of valid DTMF
signals.
tDP: Time to detect the absence of valid DTMF signals.
tGTP: Guard Time, Tone present.
G. End of tone #n + 1 is detected and validated.
tGTP: Guard Time, Tone absent.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2 2005.03.24
Page 6 of 13
Downloaded from Elcodis.com electronic components distributor
6 Page SC9270
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against
electrostatic discharge but they can be damaged if the following precautions are not taken:
• Persons at a work bench should be earthed via a wrist strap.
• Equipment cases should be earthed.
• All tools used during assembly, including soldering tools and solder baths, must be earthed.
• MOS devices should be packed for dispatch in antistatic/conductive containers.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Downloaded from Elcodis.com electronic components distributor
REV:1.2 2005.03.24
Page 12 of 13
12 Page | ||
Seiten | Gesamt 12 Seiten | |
PDF Download | [ SC9270D Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
SC9270 | DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER | Silan Semiconductors |
SC9270C | DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER | Silan Semiconductors |
SC9270D | DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER | Silan Semiconductors |
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