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MT8870DE Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
MT8870DEMITEL100Yes

MT8870DE** is a DTMF (Dual-Tone Multi-Frequency) receiver IC manufactured by **Mitel** (now part of Microchip Technology).

The MT8870DE is a DTMF (Dual-Tone Multi-Frequency) receiver IC manufactured by Mitel (now part of Microchip Technology).

Specifications:

  • Supply Voltage (VDD): 5V ±10%
  • Operating Temperature Range: -40°C to +85°C
  • Power Consumption: 35mW (typical)
  • Package: 18-pin DIP (Dual In-line Package)
  • Input Impedance: >100kΩ
  • Frequency Detection Range:
  • Low Group: 697Hz, 770Hz, 852Hz, 941Hz
  • High Group: 1209Hz, 1336Hz, 1477Hz, 1633Hz
  • Output: 4-bit binary code (Q1-Q4) representing the detected DTMF digit

Descriptions:

The MT8870DE is a complete DTMF receiver that decodes standard telephone keypad tones into a 4-bit binary output. It includes band-split filters and digital decoding functions to accurately detect DTMF signals while rejecting speech and noise.

Features:

  • Integrated Bandpass Filters: Separates high and low DTMF tone groups.
  • Digital Counting Decoder: Uses digital counting techniques for accurate detection.
  • Guard Time Adjustment: Ensures reliable decoding with adjustable validation timing.
  • StD (Steering) Output: Indicates valid DTMF signal detection.
  • Inhibit Mode: Prevents false detection during signal transitions.
  • CMOS-Compatible Outputs: Direct interface with microcontrollers and logic circuits.

This IC is commonly used in telecommunication systems, remote control applications, and DTMF-based automation.

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