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CM8870 DTMF Receiver Decoder IC

SKU: IC0056
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Product Details :

Product typeDTMF Receiver Decoder
IC NumberCM8870
Number of pins18
Pin typethrough holes
PackagePDIP-18

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CM8870 is a DTMF Receiver IC which provides full compatibility by integrating both bandsplit filter and digital decoder function. The device is manufactured by using state-of-art CMOS technology to provide low power consumption and handle precise data. it  uses digital counting technique for both detection and decoding of all 16 DTMF tone pair in 4 bit code. In filter section, it uses the switched capacitor technique for both high and low group filter and dial tone rejection. CM8870 IC has inbuilt differential input amplifier, clock generator and a latched three interface bus because of this, it minimizes external components.

Package contains

  • 1 x CM8870 IC
SKU: IC0056 Categories: ,
  • Supply voltage: 4.75V to 5.25V
  • Supply current: 3 to 7mA
  • Standby supply current: 25µA
  • Typical power consumption: 15mW
  • Maximum power consumption: 35mW
  • Maximum Low level input voltage: 1.5V
  • minimum High level input voltage: 3.5V
  • Maximum low level output voltage: 0.03V
  • Minimum High level output voltage: 4.97V
  • Input leakage current: 0.1µA
  • PABX
  • Central office
  • Mobile radio
  • Remote control data entry
  • Paging system
  • Call limiting
  • Telephone answering system
  1. +Input
  2. -Input
  3. GS -gain select
  4. Vref – reference output voltage
  5. INH – inhibit detection of tones
  6. IC – internal connection
  7. OSC1 – clock input 1
  8. OSC2 – clock input2
  9. Vss
  10. TOE – input three state output enable
  11. Q1 three state output
  12. Q2
  13. Q3
  14. Q4
  15. StD – delayed steering output
  16. ESt – early steering output
  17. St/Gt
  18. Vdd

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