Power Line Modem Circuit for Home Automation Application. Imagine you have a master controller device that control other devices in your house, and you don’t need to install any additional wires to facilitate the data communication between the master controller and the controlled devices.
Yes you’s life will be easier since all you need is just plugging your devices into your power line outlet, the devices will communicate each-other through the power line while using the line to enpower them! The secret is the powerline modem, a modem that use the powerline wiring as their media to exchange the data.
Philips Semiconductors has a single chip powerline modem solution, a TDA5051A IC chip. Here is the schematic diagram of this powerline modem circuit: The TDA5051A single chip power line modem is equipped with protection of its output power stage and automatic gain control (AGC) of input signal. BELL 103 Compatible FSK Modem Circuit. This circuit uses MM74HC942, a single chip low-speed modem which is compatible with Bell 103 standard. This Bell 103 modem circuit is run at 300 baud in full duplex (bidirectional).
The frequency and sine wave synthesizer inside this modem chip generate phase-coherent FSK modulation for the best bit accuracy. Here is the schematic diagram of the modem circuit: This single chip low speed modem is suitable for remote data collection, radio telemetry, remote-process control, stand-alone modem, credit verification, tone signaling system, or point-of-sale terminal. The tone allocation of MM74HC942, as any Bell 103 compatible modems is shown in Table I. CMX865A. Focusing on narrowband communications, CML’s ICs are found in a wide range of PMR, wireless data, digital voice and marine radio applications, such as TETRA, DMR, dPMR, SCADA systems and AIS.
The CML portfolio provides components supporting both RF and baseband functionality, encompassing leading edge digital and legacy analogue systems. The following product groups are described in detail within dedicated pages on the site and can be accessed from the links shown on the left: Analogue TWR / Digital PMR (DPMR) - Two-Way Radio products providing the full baseband and individual communication requirements of analogue and digital military, PMR, trunked and leisure radio systems. Wireless Data - products addressing a wide range of communications and control applications, offering operation to custom, free-format and packet data systems.
Most common data-transfer protocols are catered for and a broad range of modulation schemes is offered. Obsolete Products. Low-power Voice, Signalling, Data and RF ICs for Communications Applications Worldwide. TAPI Sample Programs. Holtek Semiconductor - Telecom Peripheral Series FAQs. Basic Information Question 1 What kind of packages is the HT9172 supplied in? Answer In 18-pin DIP and SOP packages. The pin layout is the same as the HT9170 to allow for easy user interchange. Functional Description What is the difference between the HT9172 and the HT9170? 1. 2. 3. Application Description When using the HT9032 device to design a caller ID phone for China, why does it fail to display the caller ID when used in Taiwan? The HT9032 is an FSK decoder device, however the system in Taiwan uses DTMF, therefore a DTMF decoded device such as HT9170 should be used to decode the caller's telephone number. Question 2 In my application circuit what op-amp would be suitable for use with the HT9020B?
There are no specific limitations on what op-amp could be used, a device such as the LM324 would be suitable. Question 3 When using the HT9020 datasheet application circuit to interface to the telephone line, why can I not decode CPT data? Question 4 Question 5 Points to Note No, you should not do so.