TSA5512 PDF

X No name tuner Now, lets try to identify the part in a noname tuner I have found. After removing the cover we find two circuits. If we look into the datasheets for the TSA we will find lot of valuable information. In most cases, you will not use this input and can therefor leave it floating. By applying a specific voltage to this input you can select several synthesizers up to 3 in one system. IF you look at page 13 in the datasheets you will see how the PLL works.

Author:Daibar Shalar
Country:Bangladesh
Language:English (Spanish)
Genre:Finance
Published (Last):24 January 2013
Pages:154
PDF File Size:16.81 Mb
ePub File Size:4.70 Mb
ISBN:904-9-98525-295-2
Downloads:87517
Price:Free* [*Free Regsitration Required]
Uploader:Vohn



X No name tuner Now, lets try to identify the part in a noname tuner I have found. After removing the cover we find two circuits. If we look into the datasheets for the TSA we will find lot of valuable information. In most cases, you will not use this input and can therefor leave it floating.

By applying a specific voltage to this input you can select several synthesizers up to 3 in one system. IF you look at page 13 in the datasheets you will see how the PLL works. The last pin can not be found in any datashets and that pin is called AGC input automatic Gain Control.

This pin control the gain of a preamplifier. The input voltage to the AGC will set the gain. Now we have identified all input to this unknown tuner.

The tuner is digital type where the frequency can be controlled via I2C inteface. The smallest frequency step size of the tuner is This stepsize is often to large. The standard stepsize in scanners are 50kHz, 25kHz, In this construction I will let the tuner make the large step in frequency You can think of it like the fig at right: You have two knobs.

The left red is the tuner which can step in The right one is the DDS which can step from 0 to The formula at bottom of the figure show you how you can set the two knobs to get all wanted frequencies. In reallity the DDS freq is not from 0 to With this two unit tuner and DDS you will now be able to scann the complete tuner range from MHz in 0.

To understand this tuner I will explain each block. A sharp filter SAW reject all other frequencies. The signal go to the first mixer where it Is mixed with a constant frequency from a crystal oscillator at The output product from the first mixer will be I use a standard 5. Before we look at mixer 2 we will go to the final block which is the demodulator. The demodulator works at kHz and before the demodulator you can find a kHz ceramic filter.

If we lock the DDS frequency to 5. Remember I told you the smallest tuner step is For the UV the stepsize is fixed to The DDS frequency will be be 5. P3 is left open and the IF output The filter has 2 inputs and two outputs. The outputs are connected to the radio circuit. The saw filter is a passband filter from It will help to remove the mirror frequency.

L1 and L2 filter the powersupply to the circuit and separate the analogue and the digital power supply. The output from the DDS is connected to a ohm resistor and after the resistor is the 9 pole filter. This filter is to suppress overtones and glitches from the digital part in the circuit.

After the filter you will have a nice shaped periodic signal at 5. One difficult is that the circuit is a fine pitch circuit, so you must have a sharp soldering tool. Radio receiver circuit The circuit is a MC At pin 1 and 2 is the oscillator. I use a crystall controlled configuration. At pin 3 you will find an output buffer from the osc. The signal from the tuner passes the SAW filter and into mixer 1 via pin The product from this mixer can be found at pin The signal enter mixer 2.

At this mixer the signal is mixed with the DDS frequency at pin 6. The product passes a kHz ceramic filter and into the FM demodulator.

The FM demodulator use a quad coil pin 13 to demodulate the audio signal. If you use this unit as a spectrum analyzer you can use this output to plot the Y-axle. The X-axle is the frequency. At pin 17 you will find the audio output. It is a low level signal about mV. I amplify this signal in a simple audio amplifier at the bottom of the schematic.

RS communication: I will now explain how the communication between the computer and the Super-tuner works. The program I have made takes care of everything! I have constructed this project so that you must use a computer to set the frequency. In this way you can easally make sure it works and from there you can add display and buttons etc.

Finally you might end up with a portable self working unit. But first you need to make sure it works and the easiest way is to let a computer calculate and set the tuner and DDS for proper frequency. I use baud,even parity,8 bit and 1 star and 1 stop bit ,e,8,1. I will now explain the communication protocol. The software I have made is general. It means you can use many different tuner with this software.

There is totally 9 register which must be set before you can receive anything. What the software does is to calculate the content of the 9 registers and send 9 byte to the PIC. Windows Software I have made a simple window software to control this Super-Receiver. The pic below show the software. I will now explain the different windows: Receiving Frequency Receiving Frequency is where you can set the frequency you want to receive.

The stepsize is entered in the same way as the frequency. Comport In this window you can select wich port you use to the Super Tuner. Tuner register settings In this window you can set the register in the tuner.

These two registers is calculated from the frequency you have entered. When you change a value of any of these registers the software will automatically send info to uppdate the tuner. The software will not do this automatically! The output frequency is calculated from the receiving frequency you have entered earlier. You will also see the 32 bit divider bits in the DDS, displayed as four bytes. Buffer The buffers shows the 9 byte which will be sent to the PIC.

When ever you change a value the buffer will be sent automatically to the PIC.

ISOCRATES PANEGYRICUS PDF

TSA5512 供应商、价格、PDF资料

X No name tuner Now, lets try to identify the part in a noname tuner I have found. After removing the cover we find two circuits. If we look into the datasheets for the TSA we will find lot of valuable information. In most cases, you will not use this input and can therefor leave it floating.

IRF521 DATASHEET PDF

Le bus I²C

IMPORTANT NOTICE Texas Instruments and its subsidiaries TI reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold. It is best suited to video amplifier and sense amplifier. Sharpness For Display.

Related Articles