Microsemi Corporation
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MT8870DS1
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MT8870DS1

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: DTMF (Dual-Tone Multi-Frequency) Decoder
  • Characteristics:
    • Converts DTMF signals into digital output
    • Suitable for telephone systems, remote control applications, and other DTMF-based systems
  • Package: SOP (Small Outline Package)
  • Essence: Decoding DTMF signals for various applications
  • Packaging/Quantity: Typically sold in reels of 2,500 units

Specifications

  • Supply Voltage: 2.5V to 5.5V
  • Operating Temperature Range: -40°C to +85°C
  • Standby Current: 3μA (typical)
  • Active Current: 5mA (typical)
  • Output Logic Levels: CMOS/TTL compatible
  • Maximum Input Signal Frequency: 50Hz to 100ms
  • Output Signal Delay: 200ms (typical)

Detailed Pin Configuration

The MT8870DS1 IC has a total of 18 pins, which are assigned specific functions as follows:

  1. VDD: Power supply voltage input
  2. INH: Inhibit control input
  3. STQ: Strobe output
  4. Q4: Data output bit 4
  5. Q3: Data output bit 3
  6. Q2: Data output bit 2
  7. Q1: Data output bit 1
  8. Q0: Data output bit 0
  9. OSC1: Oscillator input 1
  10. OSC2: Oscillator input 2
  11. VSS: Ground reference voltage
  12. IN1: DTMF input tone 1
  13. IN2: DTMF input tone 2
  14. IN3: DTMF input tone 3
  15. IN4: DTMF input tone 4
  16. IN5: DTMF input tone 5
  17. IN6: DTMF input tone 6
  18. IN7: DTMF input tone 7

Functional Features

  • DTMF Signal Decoding: The MT8870DS1 is designed to decode DTMF signals generated by a keypad or other sources.
  • Output Data: The decoded DTMF signals are provided as digital outputs (Q0-Q4) for further processing.
  • Strobe Output: The STQ pin provides a strobe output signal indicating the presence of valid DTMF tones.
  • Inhibit Control: The INH pin allows the user to disable the decoding function when necessary.

Advantages and Disadvantages

Advantages: - High accuracy in decoding DTMF signals - Low standby current consumption - Wide operating voltage range - Compact SOP package for space-constrained applications

Disadvantages: - Limited number of input tone channels (7) - Relatively higher active current consumption compared to some alternative models

Working Principles

The MT8870DS1 utilizes a combination of bandpass filters, digital counting techniques, and a digital decoder to accurately decode DTMF signals. The incoming DTMF tones are filtered and then converted into digital form. The digital data is then processed to determine the corresponding key pressed on the keypad. The decoded data is made available through the output pins for further use.

Detailed Application Field Plans

The MT8870DS1 finds extensive application in various fields, including:

  1. Telephone Systems: Used for automatic call routing, interactive voice response systems, and telephone-based authentication systems.
  2. Remote Control Applications: Enables remote control of devices using DTMF-based commands, such as home automation systems, industrial control systems, and security systems.
  3. Audio Equipment: Integrated into audio mixers, amplifiers, and sound systems for DTMF-based control and automation.
  4. Robotics: Used in robotic systems for remote control and command execution.

Detailed and Complete Alternative Models

  1. HT9170B: Similar DTMF decoder IC with 18-pin package and similar functionality.
  2. CM8870PI: DTMF decoder IC with 18-pin package and additional features like power-down mode and adjustable guard time.
  3. TCM5089: DTMF receiver IC with 16-pin package and integrated dial tone rejection capability.

These alternative models offer similar functionality to the MT8870DS1 and can be considered as alternatives based on specific requirements and availability.

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Liste 10 almindelige spørgsmål og svar relateret til anvendelsen af MT8870DS1 i tekniske løsninger

Sure! Here are 10 common questions and answers related to the application of MT8870DS1 in technical solutions:

Q1: What is MT8870DS1? A1: MT8870DS1 is a DTMF (Dual-Tone Multi-Frequency) decoder IC that converts the analog signals received from a telephone line into digital signals.

Q2: What are the typical applications of MT8870DS1? A2: MT8870DS1 is commonly used in applications such as telecommunication systems, remote control systems, security systems, and automated dialing systems.

Q3: How does MT8870DS1 decode DTMF signals? A3: MT8870DS1 uses a combination of bandpass filters, digital counting techniques, and a digital decoder to accurately decode the DTMF signals.

Q4: What is the operating voltage range for MT8870DS1? A4: The operating voltage range for MT8870DS1 is typically between 2.5V and 5.5V.

Q5: Can MT8870DS1 handle both standard and extended DTMF frequencies? A5: Yes, MT8870DS1 can handle both standard (0-9, *, #) and extended (A-D) DTMF frequencies.

Q6: What is the maximum DTMF signal duration that MT8870DS1 can handle? A6: MT8870DS1 can handle DTMF signal durations up to 100ms.

Q7: Does MT8870DS1 provide any output indication of the decoded DTMF signal? A7: Yes, MT8870DS1 provides a 4-bit binary output indicating the decoded DTMF digit.

Q8: Can MT8870DS1 detect multiple DTMF signals simultaneously? A8: No, MT8870DS1 can only detect one DTMF signal at a time.

Q9: What is the typical power consumption of MT8870DS1? A9: The typical power consumption of MT8870DS1 is around 5mW.

Q10: Is MT8870DS1 available in different package options? A10: Yes, MT8870DS1 is available in various package options such as SOP (Small Outline Package) and DIP (Dual In-line Package).

Please note that these answers are general and may vary depending on the specific implementation and datasheet of MT8870DS1.