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MT8870 Proteus Lib Download: A Complete Tutorial for DTMF Decoding Simulation



- Benefits of using MT8870 for DTMF decoding H2: How to add MT8870 library in Proteus 8.0? - Steps to download and import MT8870 library in Proteus 8.0- How to use MT8870 component in Proteus 8.0 H3: How to simulate a DTMF decoder circuit using MT8870 in Proteus 8.0? - Circuit diagram and components required- Simulation settings and results H4: How to test the DTMF decoder circuit using MT8870 in Proteus 8.0? - How to generate DTMF signals using a keypad or a phone- How to observe the decoded output on an LCD or a serial monitor H2: Conclusion - Summary of the main points- Call to action for the readers H3: FAQs - Five common questions and answers about MT8870 and Proteus 8.0 # Article with HTML formatting What is MT8870 and why do you need it?




Have you ever wondered how your phone can communicate with another phone using tones? How can you dial a number and get connected to the person you want to talk to? The answer is DTMF, which stands for Dual Tone Multi Frequency. DTMF is a signaling system that uses a combination of two sinusoidal tones to represent a digit or a symbol. For example, when you press the number 1 on your phone keypad, it generates a tone that consists of two frequencies: 697 Hz and 1209 Hz.




Mt8870 Proteus Lib Download



But how can you decode these tones and convert them into digital signals that can be processed by a microcontroller or a computer? That's where MT8870 comes in handy. MT8870 is an integrated circuit that can decode DTMF signals and provide a 4-bit binary output that corresponds to the pressed digit or symbol. MT8870 has many features that make it suitable for DTMF decoding applications, such as:


  • It can operate on a single 5V power supply.



  • It has an internal band-split filter that separates the high and low frequencies of the DTMF signal.



  • It has an internal digital decoder that identifies the tone pair and produces the binary output.



  • It has an output enable pin that allows you to control when the output is valid.



  • It has a power-down pin that allows you to reduce the power consumption when not in use.



By using MT8870, you can easily build a DTMF decoder circuit that can interface with various devices, such as microcontrollers, LCDs, LEDs, relays, etc. You can use this circuit for many applications, such as remote control, home automation, security systems, etc.


How to add MT8870 library in Proteus 8.0?




If you want to simulate your DTMF decoder circuit using MT8870 in Proteus 8.0, you need to add the MT8870 library first. Proteus 8.0 does not have the MT8870 component by default, so you need to download it from an external source and import it into your Proteus software. Here are the steps to do that:


  • Download the MT8870 library from this link. It is a zip file that contains two files: mt8870.LIB and mt8870.IDX.



  • Extract the zip file and copy the two files into the LIBRARY folder of your Proteus software. The default location of this folder is C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\LIBRARY.



  • Open your Proteus software and go to Library Manager from the System menu.



  • Click on Browse Libraries and locate the mt8870.LIB file in the LIBRARY folder.



  • Select the mt8870.LIB file and click on Add Library.



  • Click on OK to close the Library Manager.



Congratulations! You have successfully added the MT8870 library in Proteus 8.0. Now you can use the MT8870 component in your simulation projects.


How to use MT8870 component in Proteus 8.0?




To use the MT8870 component in Proteus 8.0, you need to follow these steps:


  • Create a new project or open an existing one in Proteus 8.0.



  • Go to Pick Devices from Libraries from the Components menu.



  • Type mt8870 in the Keyword box and press Enter.



  • Select the mt8870 component from the list and click on OK.



  • Place the mt8870 component on your schematic sheet and connect it according to your circuit design.



The mt8870 component has 18 pins that are labeled as follows:


Pin Number Pin Name Pin Function --- --- --- 1 IN+ Non-inverting input of op-amp 2 IN- Inverting input of op-amp 3 GS Gain select pin 4 VSS Ground pin 5 OSC1 Oscillator input pin 6 OSC2 Oscillator output pin 7 STD Delay steering output pin 8 Q4 Most significant bit of binary output 9 Q3 Third bit of binary output 10 Q2 Second bit of binary output 11 Q1 Least significant bit of binary output 12 ESt Early steering output pin 13 VDD Positive power supply pin 14 PDN Power-down input pin 15 TOE Three-state output enable input pin 16 NC No connection pin 17 NC No connection pin 18 NC No connection pin How to simulate a DTMF decoder circuit using MT8870 in Proteus 8.0?




To simulate a DTMF decoder circuit using MT8870 in Proteus 8.0, you need to design your circuit according to your application requirements. For example, if you want to decode DTMF signals from a phone line, you need to connect a transformer and some resistors and capacitors between the phone line and the IN+ and IN- pins of MT8870. If you want to generate DTMF signals using a keypad, you need to connect a DTMF generator IC such as UM91214B or HT9202 between the keypad and the IN+ and IN- pins of MT8870.


You also need to connect some external components to configure the MT8870 properly. For example, you need to connect a crystal oscillator between OSC1 and OSC2 pins to provide a clock signal for MT8870. You need to connect a resistor between GS and VSS pins to set the gain of op-amp inside MT8870. You need to connect STD pin to VDD through a pull-up resistor and ESt pin to VSS through a pull-down resistor. You need to connect PDN pin to VDD or VSS depending on whether you want to enable or disable power-down mode. You need to connect TOE pin to VDD or VSS depending on whether you want to enable or disable three-state output mode.


The following table shows an example circuit diagram for simulating a DTMF decoder circuit using MT8870 in Proteus 8.0:



DTMF Decoder Circuit Using MT8870


ComponentValuePin ConnectionFunction


MT88701--DTMF Decoder IC


X13.579545 MHzOSC1-OSC2Crystal Oscillator


Gain Select Resistor


R2100 kΩSTD-VDDPull-up Resistor


R3100 kΩESt-VSSPull-down Resistor


C10.1 µFVDD-VSSDecoupling Capacitor


T1600:600 ΩPhone Line-IN+ IN-Isolation Transformer


C20.1 µFIN+-IN-DC Blocking Capacitor


LCD116x2Q1-Q4-RS-EN-D4-D7LCD Display


-Positive Power Supply


VSS0V-Ground


PDNVDD-Power-down Disable


TOEVDD-Three-state Output Enable


NC--No Connection


How to test the DTMF decoder circuit using MT8870 in Proteus 8.0?




To test the DTMF decoder circuit using MT8870 in Proteus 8.0, you need to generate DTMF signals using a keypad or a phone and observe the decoded output on an LCD or a serial monitor. Here are the steps to do that:


  • Connect a keypad or a phone to the input of the transformer T1. You can use a virtual terminal or a COM port in Proteus 8.0 to simulate a phone.



  • Connect an LCD or a serial monitor to the output of MT8870. You can use a virtual terminal or a COM port in Proteus 8.0 to simulate a serial monitor.



  • Run the simulation and press any digit or symbol on the keypad or the phone. You should hear a tone that consists of two frequencies.



  • Observe the LCD or the serial monitor and check if the decoded output matches the pressed digit or symbol. You should see a 4-bit binary code that corresponds to the DTMF signal.



  • Repeat the steps for different digits and symbols and verify if the decoding is correct.



Conclusion




In this article, you learned what is MT8870 and why do you need it for DTMF decoding applications. You also learned how to add MT8870 library in Proteus 8.0 and how to use MT8870 component in Proteus 8.0. You also learned how to simulate and test a DTMF decoder circuit using MT8870 in Proteus 8.0.


If you found this article helpful and informative, please share it with your friends and colleagues who are interested in DTMF decoding and Proteus 8.0. If you have any questions or feedback, please leave them in the comments section below. Thank you for reading!


FAQs




  • Q: What is DTMF?A: DTMF stands for Dual Tone Multi Frequency, which is a signaling system that uses a combination of two sinusoidal tones to represent a digit or a symbol.



  • Q: What is MT8870?A: MT8870 is an integrated circuit that can decode DTMF signals and provide a 4-bit binary output that corresponds to the pressed digit or symbol.



  • Q: How to add MT8870 library in Proteus 8.0?A: You need to download the MT8870 library from an external source and import it into your Proteus software.



  • Q: How to use MT8870 component in Proteus 8.0?A: You need to place the MT8870 component on your schematic sheet and connect it according to your circuit design.



  • Q: How to simulate and test a DTMF decoder circuit using MT8870 in Proteus 8.0?A: You need to generate DTMF signals using a keypad or a phone and observe the decoded output on an LCD or a serial monitor.




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