XD-61 DTMF MT8870 Voice Decoding Module

The XD-61 DTMF MT8870 Voice Decoding Module is a reliable Dual-Tone Multi-Frequency (DTMF) decoder based on the MT8870 IC. It is widely used for decoding telephone keypad tones or remote control signals in embedded systems. The module converts audio tone inputs into 4-bit digital outputs, making it ideal for telephone interfacing, audio-controlled robotics, and remote switching systems.

Key Features of XD-61 DTMF MT8870 Voice Decoding Module:

• MT8870 IC Based: Reliable tone decoding using industry-standard MT8870.
• 4-Bit Output: Converts DTMF tones to 4-bit binary data.
• Built-in Band Split Filter: Separates high and low group tones efficiently.
• LED Indicator: Shows valid tone detection visually.
• Onboard Audio Input Jack: Easy connection with audio sources.

Technical Specifications of XD-61 DTMF MT8870 Voice Decoding Module:

• IC Used: MT8870 DTMF Decoder
• Operating Voltage: 3.5V to 5.5V DC
• Frequency Detection Range: 697 Hz to 1633 Hz
• Output Format: 4-bit binary (Q1 to Q4)
• Valid Tone Output: LED and StD (Delayed Steering Output)
• Audio Input: 3.5mm jack or onboard mic header

Mechanical Specifications of XD-61 DTMF MT8870 Voice Decoding Module:

• PCB Dimensions: 38mm x 22mm
• Mounting Holes: 4x M2 holes for easy enclosure mounting
• Connectors: Header pins for power and data output
• Indicator: Power and Tone Detected LEDs

Dimensions:

• Length: 38mm
• Width: 22mm
• Height: 12mm (including components)
• Mount Hole Diameter: 2mm

Mounting Options:

• PCB Mount: Easily integrates with main control boards using header pins.
• Enclosure Mount: Mountable using 4 screw holes for mechanical stability.

Schematic Diagram, Connection, Wiring and Pinout of XD-61 Module:

• Power: VCC (3.5–5.5V), GND
• Input: Audio via 3.5mm jack or IN+ and IN- pins
• Outputs: Q1 to Q4 = 4-bit data, StD = Signal valid output
• Connection: Connect output pins to microcontroller GPIOs for reading key codes

Datasheet of XD-61 DTMF MT8870 Voice Decoding Module:

• Download MT8870 IC Datasheet (PDF)

Applications of XD-61 DTMF MT8870 Voice Decoding Module:

• DTMF Remote Control: Control devices via audio signals from phone keypads.
• Audio-Activated Projects: Interface between telephone lines and microcontrollers.
• Access Control: Remote door unlocking with phone tone input.
• Industrial Monitoring: Used in automated systems for remote command handling.
• Robot Control: DTMF-based audio command for mobile robot navigation.

Equivalent of XD-61 DTMF MT8870 Voice Decoding Module:

• MT8870 Module: General-purpose decoder module with similar functionality
• HT9170 Module: Alternative tone decoder IC with slight variations in timing
• MT8880: DTMF transceiver supporting both transmit and receive functions

Package Includes:

• 1 x XD-61 DTMF MT8870 Voice Decoding Module