MT8870DS

The MT8870DS is a dual-tone multi-frequency (DTMF) receiver integrated circuit (IC) produced by GEC Plessey Semiconductors. This device is designed to decode the DTMF signals generated by telephone keypads, making it a crucial component in various telecommunications applications, including telephone systems, interactive voice response (IVR) systems, and remote control systems.

Key Features:

1. DTMF Decoding: The MT8870DS can accurately decode the DTMF signals, which consist of a combination of two frequencies (one from a low group and one from a high group) corresponding to each key on a telephone keypad. The IC can recognize all 16 DTMF tones, which include the digits 0-9, the letters A-D, and the special symbols * and #.

2. Operating Voltage: The device typically operates within a voltage range of 3V to 12V, making it versatile for various applications. This low voltage operation allows for integration into battery-powered devices.

3. Low Power Consumption: The MT8870DS is designed for low power consumption, which is essential for portable and battery-operated devices. This feature helps extend the operational life of such devices.

4. Output Format: The IC provides a 4-bit binary output corresponding to the detected DTMF tone. This output can be easily interfaced with microcontrollers or other digital logic circuits for further processing.

5. Built-in Filters: The MT8870DS includes internal bandpass filters that help to eliminate noise and ensure accurate detection of the DTMF signals. This feature enhances the reliability of the device in various environments.

6. Pin Configuration: The IC is typically available in a 16-pin dual in-line package (DIP) or surface mount package (SMD), facilitating easy integration into circuit designs. The pin configuration includes inputs for the DTMF signal, power supply, ground, and output pins for the decoded signals.

7. Application Versatility: The MT8870DS is suitable for a wide range of applications, including but not limited to:

   • Telephone answering machines
   • Interactive voice response systems
   • Remote control systems
   • Security systems
   • Home automation devices

8. Temperature Range: The device is designed to operate within a specified temperature range, typically from -40°C to +85°C, ensuring reliable performance in various environmental conditions.

Conclusion:

The MT8870DS from GEC Plessey Semiconductors is a robust and efficient DTMF receiver IC that plays a vital role in modern telecommunications. Its ability to decode DTMF signals accurately, combined with low power consumption and versatile application potential, makes it a popular choice among engineers and designers in the field of electronics. Whether used in consumer electronics or industrial applications, the MT8870DS provides a reliable solution for DTMF signal processing.