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CD22203 - 5V Low Power DTMF Receiver

General Description

The CD22202 and CD22203 complete dual-tone multiple frequency (DTMF) receivers detect a selectable group of 12 or 16 standard digits.

No front-end pre-filtering is needed.

Key Features

  • Central Office Quality.
  • No Front End Band Splitting Filters Required.
  • Single, Low Tolerance, 5V Supply.
  • Detects Either 12 or 16 Standard DTMF Digits.
  • Uses Inexpensive 3.579545MHz Crystal for Reference.
  • Excellent Speech Immunity.
  • Output in Either 4-Bit Hexadecimal Code or Binary Coded 2-of-8.
  • Synchronous or Handshake Interface.
  • Three-State Outputs.
  • Excellent Latch-Up Immunity Ordering Information PART NUMBE.

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Other Datasheets by Intersil (now Renesas)

Part Number Description
CD22202 5V Low Power DTMF Receiver
CD22204 5V Low Power Subscriber DTMF Receiver
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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DTMF Receivers/Generators CD22202, CD22203 January 1997 5V Low Power DTMF Receiver Description The CD22202 and CD22203 complete dual-tone multiple frequency (DTMF) receivers detect a selectable group of 12 or 16 standard digits. No front-end pre-filtering is needed. The only externally required components are an inexpensive 3.579545MHz TV “colorburst’’ crystal (for frequency reference) and a bias resistor. Extremely high system density is possible through the use of the clock output of a crystal connected CD22202/CD22203 receiver to drive the time bases of additional receivers. This is a monolithic integrated circuit fabricated with low-power, complementary symmetry CMOS processing. It only requires a single low tolerance power supply.