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ADF7023 Transceiver Problems

Question asked by Yavari on Nov 16, 2011
Latest reply on Nov 17, 2011 by Yavari

Hi !

 

Here is some ADF7023 issues . please check if they should be added in errata .

 

1) Manchester coding and decoding in ADF7023 is implemented complementary . You can encode some bytes according to manchester rule (described in datasheet or Wiki) and send it via Eval kit to another ADF7023 (receiver) . and enable manchester decoding on receiver side . you will see the bytes decoded are complemented .

 

When you use manchester encode & decode on both sides , both of them complement bytes and you will not sense the problem . this issue appeared when I was transmitting manchester encoded packet by another transceiver (CC1101 from TI) and receiving them via ADF7023  .

 

 

2) Immediately after CMD_HW_RESET, ADF7023 goes to sleep and consumes current less than uA . but  50ms to 100 ms later, ADF7023 will consume about 2mA for a duration of less than 10 ms and current goes low again .  I saw this behavior via Ampere meter that was plotting current consumption on PC .

 

So I don't know if ADF7023 is doing some calibration process or any other task after going to HW_RESET state. But if I can disable this wake up like behavior by any change in register setting,  average current consumption of my circuit will be reduced . because I should force ADF7023 in sleep frequently.

 

3) If you issue CMD_HW_RESET , ADF7023 will consume about 0.5 uA more than current specified in sheet . but if you set BBRAM_Retention_Enable bit before issuing  CMD_HW_RESET , the current consumption will be reduced . I don't know why . because HW_RESET state should be independent of RAM retention bit status .

 

 

4) Matching circuit that is implemented on Daugther card has 2  LC components more than diagram specified in reference design . please let me know if the difference affects performanc . Can I have updated reference designe with detailed BOM ?

 

 

Thanks in advance for you attention

Yavari

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