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Mark_St
Joined: 23 Feb 2009
Posts: 3
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 23 Feb 2009 14:41 adf7020 interface |
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http://www.analog.com/en/rfif-components/rfif-transceivers/adf7020-1/products/product.html
Device: AFD7020 -1 transceiver
Micro controller : picmicro
I really need help on this one.
My goal is to connect transceiver to one pin of the microcontroller and to set all necessary parts for transceiver work.
I guess this is all what i need:
- Amplifier
- Antenna
- External power supply?
Frequency is not set yet, but it will be or 250 MHZ or 450 or 550 MHZ.
Can someone be so kind to draw the schematics ?
I now it's big request, but i really dont know how to make this.
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Mark_St
Joined: 23 Feb 2009
Posts: 3
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25 Feb 2009 13:23 transceiver schematics |
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Schematics:
http://tinypic.com/view.php?pic=9krwgm&s=5
ADF7020-1
http://tinypic.com/view.php?pic=3499x61&s=5
ADF7020-1
http://tinypic.com/view.php?pic=2yxjde8&s=5
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Hi!
This is the part that i can made ( first link ) but now i need your help.
Any idea how to connect the transceiver ?
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RFDave
Joined: 18 Feb 2004
Posts: 346
Helped: 45
Location: NE USA
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25 Feb 2009 14:03 adf7020 project |
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Have you read through the app notes @ the Analog devices site? They also have a SRD design studio software that might be useful.
1- frequency will be determined by the appropriate regulatory body. In the US, you will probably use one of the ISM bands for license free operation.
2-you need to also design the PLL loop filter. It looks like there are a couple of other external components to determine, as well.
3-you might not need an external amplifier. depends on part 1.
4-Is this a student project? you might be better off buying a couple of ADI's evaluation boards as a starting point
Dave
www.keystoneradio.com
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25 Feb 2009 14:03 Ads |
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Mark_St
Joined: 23 Feb 2009
Posts: 3
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06 Mar 2009 12:12 adf7020, code, sample |
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Hello !
I am really sorry for so long respond time.
frequency will be determined by the appropriate regulatory body
** You have written that i dont need the external amplifier if i can arrange the regulator part. Can you please give me more details and what do you suggest ?
you need to also design the PLL loop filter
** I downloaded the studio software and there you can find bunch of good stuff. One of them is the PLL/VCO part, where you can calculate all for design.
Mark
Added after 55 minutes:
This is the schematics that is generated by studio...
What do you think ?
The frequency range is from 250 to 260 and 255 MHZ is set as middle one.
http://tinypic.com/view.php?pic=10dry8y&s=5
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RFDave
Joined: 18 Feb 2004
Posts: 346
Helped: 45
Location: NE USA
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08 Mar 2009 17:18 long range rf transceiver schematic |
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The use of RF spectrum is governed by rules and regulations. In the US, the FCC sets the rules. There are some specific bands of spectrum that are set aside for License free operation. This is called FCC Part 15, and if you google for this, you will find some Part 15 FAQ documents that describe what the rules are. I believe there is a chunk of spectrum at ~300 MHz that is available for Part 15 operation. If you are not in the US, you'll have to figure out the appropriate requirements. These rules cover both the frequencies you can operate in, as well as the output power requirements. That was the root of my comment about both the frequency you use, as well as your comment about the output power and the need for an external amplifier. The ADF7020 puts out up to +13 dBm, which is probably as much as you can use.
You won't be able to do this with a single microcontroller pin, you'll need to use a serial interface. There are 5 pins that are important, Chip enable, load enable, and the serial data clock and Data in/out.
As far as the schematic, that's a good starting point. I would suggest that you make a list of every pin on the ADF7020, and read the datasheet to understand what the function is and what you need to do to implement this. I'd start with Table 4 in the spec, which has a list of the pins and the functionality. This should help you with what's on the outside.
THis should keep you busy for a bit, and help you understand what you need to do.
Dave
www.keystoneradio.com
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ahmadyousaf
Joined: 25 Mar 2009
Posts: 1
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25 Mar 2009 20:31 rf transceiver schematic |
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Hi all,
Can anyone help me with the serial interface of ADF7020 transceiver?
My goal is to send and receive data over the RF at 433 MHz using FSK with 9.6 kbps data rate.
The problem is that when I try to read out the data received by the chip, is not what I actually sent; data is corrupted and misplaced. The TxRxClck pin outputs a square wave but not stable. I've tested my SPI portion with another SPI compatible device and its working fine. I'm using PIC Micro at 11.0592 Fosc. Please help!
Regards,
----------------------------
Ahmad Yousuf
Live and let "Live"
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Vandal S
Joined: 02 May 2009
Posts: 50
Helped: 2
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02 May 2009 2:17 pll hf transceiver schematic |
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are you coding the data, correcting it? the problem with the receiver is that it receives everything, mostly noise  things like Manchester encoding are useful. http://en.wikipedia.org/wiki/Manchester_encoding
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nagaraju427
Joined: 21 Jul 2009
Posts: 1
Location: Indore,India
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21 Jul 2009 11:04 pll hf transceiver |
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hi,
i have a adf7020-1 RF transceiver daughter board and i am trying to interface this with my micro controller lpc2131.
adf7020-1 has two interfaces one is spi and another is simple serial. does spi interface only for configuring the registers...? then simple serial is used to data rx/tx..?
i am very new to these rf communication. i want to configure my RF transceiver to 433 MHz and Tx/RX speed should be 9.6k.
can any body plz send me the sample code for initialization of ADF7020-1 and configuration.
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