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75T202 - 5V Low Power DTMF Receiver

Datasheet Summary

Description

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.

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 E.

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Datasheet preview – 75T202

Datasheet Details

Part number 75T202
Manufacturer TDK
File Size 72.93 KB
Description 5V Low Power DTMF Receiver
Datasheet download datasheet 75T202 Datasheet
Additional preview pages of the 75T202 datasheet.

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Full PDF Text Transcription

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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 .
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