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Part Number: LMX2487E-EVM
Hello
I had bought LMX2487E-EVM for my customer support (customer's app is SDR..)
Would you please let me know about programming to device?
Question:
Q1
Is “Program Pins” setting needed for LMX2487E EVM? How do I set this for program to device for LMX2487E-EVM case?
(DATA,CLK,LE is seemed correctly without “Program Pins”: see attached)
Q2
I can program (write to device) using Coadloader4 with uWire , but are there any way to read teh seetting from device?
( I don't have OSC , Spectrum analyzer now...)
Q3
Does TI have any IC to detect RSSI for 25MHz ~ 1.3GHz range?
If you can introduce, please advise.
I had attached ppt files
Thank you for your support and with my best regards
Dear Brian,
Thank you for your quick reply!
I found that CE=High( pull up to 3.3V), ENOSC=Open( not connected to uWire) in the LMX2487E-EVM hardware setting.
So, I think it should be written correctly without "Program-pin" setting in the Codeloader.
I understood that the Only way check whether program correctly or not is, use EVM by actual RF input and monitor RFoutput.
Thank you
Best Regards
Hello!
Dear Brian-san
Thank you for your advice quickly !!
The correct way to check the MUX[3:0] Ftest/LD is just set MUX[3:0] as 0001 ( logic High) or 0010(logic low) by Coadloader and
monitor the TP Ftest/LD ?
I had checked by LMX2487E-EVM but Ftest/LD stays low regrardless of setting on Coadloader.
There may be anything lack/ mistake but I could not find the way..
I'm sorry to bother you, but would you please let me know the procedure to check the MUX[3:0] function ?
( I don't have RF oscillator also Spectrum analyzer..)
Best Regards
Dear Noel-san
Thank you for your answer in detail !!
Sorry to late my reply.
I did not have OSCin (100MHz) to LMX2487E EVM ,but is OSCin nesessary for programming?
I thought if DATA,CLOCK,LE are applied through Codeloader, it should be programmed correctly.
( I can monitor them in oscilloscope and it seems to be changed correctly if I changed R4 for example)
Anyway I failed for Power down test and LD pin test even though Data, Clock and LE can been seen in the LMX2487E device pin in the EVM.
*I had reffered SNAU083A ( Coadloader 4 Programming Instructions ) and also EVM User's guide SNAU114D.
*I see CE=High.
*ENOSC=High.
* I applied reference clock applied ( 100MHz 0dBm to OSCin) but failed power down test/LD pin test also.
If you have any opinion for evm instruction, please advise.
Anyway customer had designed their first PCB already without LMX2487E evm investigation...
We will check customer's PCB next week using Codeloader4 and USB2ANY/uWire.
Again,Programming to LMX2487E has no need to have OSCin , correct?
Thank you
Best Regards[
Dear Noel-san
Thank you for your answer, and I'm sorry my delay because I and customerf is still investigate LMX2487E-EVM.
Would you please help us?
Q1
Your mentioned Table 3 is snau137a page 35 ?
I followed that, and got DATA/CLOCK/LE which seems correctly. ( Please refer attached ppt page 2)
http://www.tij.co.jp/jp/lit/ug/snau137a/snau137a.pdf
Q2
Is there any sequence ( order ) to program register R4 ?
:For example, R4 should be programmed after R0~R3 were programmed…?
:For example, Power OFF(CE=L) and power ON to reset all registers..?
Otherwise I doubt my LMX2487E EVM may broken…
Q3
Our ( customer’s) goal is to have a divider .
Fin_RF ==> 450MHz input (1/384) RF_N/2 divider ==> output 1.17MHz to Ftest/LD pin as CMOS ==> Customer's MCU.
(Before they had been used MB15F72UL(Fujitsu) but its EOL, so customer design using LMX2485E for 2018 new Digital Radio product )
We have no LMX2485E EVM so, evaluating LMX2487E EVM and we will replace it to LMX2485E. ( uinfortunately EVM not works wel)
Anyway,,
I believe above is achieved for LMX2485E,but would you please confirm again?
If yes , which is better to select RF_P= 0 or RF_P=1, both of RF_P=0 or 1 is Okay ??
Please kindly refer attached PPT.
Thank you your support and with my best regards
Hi Kanji-san,
Q1. Please use the updated EVM user's guide:
Q2. There is no programming sequence in LMX24xx devices.
Q3. This operation is possible, see the test setup and result. I suggest use IF for lower power consumption.
Dear Noel-san
Thank you for your advice and your test result using IF_N, got Ftest/LD out=1.17MHz quickly !!
I found Table 3 on Updated user's guide is
http://www.ti.com/lit/ug/snau114d/snau114d.pdf
We will investigate customer's board using USB2ANY and uWire adapter card from this week.
Thank you for your support again and with my best regards