DatasheetsPDF.com

75T202

TDK
Part Number 75T202
Manufacturer TDK
Description (75T202 / 75T203) 5V Low Power DTMF Receiver
Published Jan 22, 2006
Detailed Description DESCRIPTION w The 75T202 and 75T203 are complete Dual-tone Multifrequency (DTMF) receivers detecting a selectable grou...
Datasheet PDF File 75T202 PDF File

75T202
75T202

Overview
DESCRIPTION w The 75T202 and 75T203 are complete Dual-tone Multifrequency (DTMF) receivers detecting a selectable group of 12 or 16 standard digits.
No front-end pre-filtering is needed.
The only externally required components are an inexpensive 3.
58 MHz television “colorburs” crystal (for frequency reference) and a bias resistor.
Extremely high system density is made possible by using the clock output of a crystal-connected 75T202 or 75T203 receiver to drive the time bases of additional receivers.
Both are monolithic integrated circuits fabricated with low-power, complementary symmetry MOS (CMOS) processing.
They require only a single low tolerance voltage supply and are packaged in a standard 18-pin plastic DIP.
w at .
D w h S a t e e 4U m o .
c 75T202/203 5V Low-Power DTMF Receiver February 1998 FEATURES • • • • • • • • • • • 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) (continued) BLOCK DIAGRAM PRE-PROCESSOR ANALOG 60 Hz REJECT PREEMP BAND SPLIT FILTERS BS1 ZERO CROSSING DETECTORS ATB XEN XIN 1Mz XOUT w w ÷8 .
D w BS2 t a S a 697 770 852 941 1209 1336 1477 1633 CHIP CLOCKS e h t e U 4 .
c m o BANDPASS FILTERS AMPLITUDE DETECTORS TIMING CIRCUITRY ED 75T203 CLRDV CLR DV DV F.
F.
DATA STROBE HEX/B28 D1 DV CLOCK GENERATOR OUTPUT DECODER OUTPUT REGISTER POWER REGULATOR VOLTAGE REF DATA CLEAR VP GND GND IN1633 w w w .
D a S a t e e h U 4 t D2 D4 D8 EN m o .
c 75T202/203 5V Low-Power DTMF Receiver DESCRIPTION (continued) The 75T202 and 75T203 employ state-of-the-art circuit technology to combine digital and analog functions on the same CMOS chip using a...


Similar Datasheet


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site. (Privacy Policy & Contact)