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SC9270D Schematic ( PDF Datasheet ) - Silan Semiconductors

Teilenummer SC9270D
Beschreibung DTMF DEMODULATOR WITH FILTER AND DIGITAL DECODER
Hersteller Silan Semiconductors
Logo Silan Semiconductors Logo 




Gesamt 12 Seiten
SC9270D Datasheet, Funktion
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






SC9270D Datasheet, Funktion
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









SC9270D pdf, datenblatt
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
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