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Original question:

LMX2594: Unexpected R110 Readback

LMX2594: lmx2594 frequency unstable,drift

Chen yan-ting
Intellectual 965 points
Part Number: LMX2594

Tool/software:

I read R110 to determine lock status.  The readback value is 0x01EA.

I am not sure where wrong,but I have this file1121.test.tcs

this is my teamMate setting , but it seem some mistake,and i am not RF expert.

i only can check the value of R110 register.

please help me find the bug ,thx

  • 0
    TI__Guru** 108330 points

    Hi Yan Ting,

    Your configuration is fine. 

    First of all, make sure you can program the device. To verify this, after Vcc power up the device, program POWERDOWN=1, if there is significant current change, that mean programming is fine.

    Then follow below procedure to program the device.

    1. Make sure you have a valid input clock

    2. Program RESET = 1

    3. Program all registers in descending order. That is, from the highest address to the lowest address, the last register to program is R0.

    4. This step is optional. Program R0 one more time.

  • 0 in reply to Noel Fung
    Intellectual 965 points

    hello ,Noel Fung.

    But the register R110 value is 1EA that mean D10,D9=0 , it mean unlock.

    my command with spi is 

    void initial()
    {
    sendSPI(0x62, 0x02, 0x00);
    sendSPI(0x63, 0x00, 0x00);
    sendSPI(0x66, 0x3F, 0x80);
    sendSPI(0x67, 0x00, 0x00);
    sendSPI(0x51, 0x00, 0x00);
    sendSPI(0x52, 0x1E, 0x00);
    sendSPI(0x53, 0x00, 0x00);
    sendSPI(0x54, 0x00, 0x01);
    sendSPI(0x55, 0xD3, 0x00);
    sendSPI(0x56, 0x00, 0x00);
    sendSPI(0x4E, 0x00, 0x03);
    sendSPI(0x4F, 0x00, 0x26);
    sendSPI(0x50, 0x66, 0x66);
    }
    void Set_LO()
    {
    sendSPI(0x4B, 0x09, 0x00);
    sendSPI(0x22, 0x00, 0x00);
    sendSPI(0x24, 0x00, 0x2A);
    sendSPI(0x2D, 0xC8, 0xDF);
    sendSPI(0x22, 0x00, 0x00);
    sendSPI(0x24, 0x00, 0x32);
    }
    void Reset()
    {
    // block 1
    sendSPI(0x70, 0x00, 0x00);
    sendSPI(0x6F, 0x00, 0x00);
    sendSPI(0x6E, 0x00, 0x00);
    sendSPI(0x6D, 0x00, 0x00);
    sendSPI(0x6C, 0x00, 0x00);
    sendSPI(0x6B, 0x00, 0x00);
    sendSPI(0x6A, 0x00, 0x00);
    sendSPI(0x69, 0x00, 0x21);
    sendSPI(0x68, 0x00, 0x00);
    sendSPI(0x67, 0x00, 0x00);
    sendSPI(0x66, 0x00, 0x00);
    sendSPI(0x65, 0x00, 0x11);
    // block 2
    sendSPI(0x64, 0x00, 0x00);
    sendSPI(0x63, 0x00, 0x00);
    sendSPI(0x62, 0x00, 0x00);
    sendSPI(0x61, 0x08, 0x88);
    sendSPI(0x60, 0x00, 0x00);
    sendSPI(0x5F, 0x00, 0x00);
    sendSPI(0x5E, 0x00, 0x00);
    sendSPI(0x5D, 0x00, 0x00);
    sendSPI(0x5C, 0x00, 0x00);
    sendSPI(0x5B, 0x00, 0x00);
    sendSPI(0x5A, 0x00, 0x00);
    sendSPI(0x59, 0x00, 0x00);
    // block 3
    sendSPI(0x58, 0x00, 0x00);
    sendSPI(0x57, 0x00, 0x00);
    sendSPI(0x56, 0x00, 0x00);
    sendSPI(0x55, 0x00, 0x00);
    sendSPI(0x54, 0x00, 0x00);
    sendSPI(0x53, 0x00, 0x00);
    sendSPI(0x52, 0x00, 0x00);
    sendSPI(0x51, 0x00, 0x00);
    sendSPI(0x50, 0x00, 0x00);
    sendSPI(0x4F, 0x00, 0x00);
    sendSPI(0x4E, 0x00, 0x03);
    sendSPI(0x4D, 0x00, 0x00);
    // block 4
    sendSPI(0x4C, 0x00, 0x0C);
    sendSPI(0x4B, 0x08, 0x00);
    sendSPI(0x4A, 0x00, 0x00);
    sendSPI(0x49, 0x00, 0x3F);
    sendSPI(0x48, 0x00, 0x01);
    sendSPI(0x47, 0x00, 0x81);
    sendSPI(0x46, 0xC3, 0x50);
    sendSPI(0x45, 0x00, 0x00);
    sendSPI(0x44, 0x03, 0xE8);
    sendSPI(0x43, 0x00, 0x00);
    sendSPI(0x42, 0x01, 0xF4);
    sendSPI(0x41, 0x00, 0x00);
    // block 5
    sendSPI(0x40, 0x13, 0x88);
    sendSPI(0x3F, 0x00, 0x00);
    sendSPI(0x3E, 0x03, 0x22);
    sendSPI(0x3D, 0x00, 0xA8);
    sendSPI(0x3C, 0x00, 0x00);
    sendSPI(0x3B, 0x00, 0x01);
    sendSPI(0x3A, 0x90, 0x01);
    sendSPI(0x39, 0x00, 0x20);
    sendSPI(0x38, 0x00, 0x00);
    sendSPI(0x37, 0x00, 0x00);
    sendSPI(0x36, 0x00, 0x00);
    sendSPI(0x35, 0x00, 0x00);
    // block 6
    sendSPI(0x34, 0x08, 0x20);
    sendSPI(0x33, 0x00, 0x80);
    sendSPI(0x32, 0x00, 0x00);
    sendSPI(0x31, 0x41, 0x80);
    sendSPI(0x30, 0x03, 0x00);
    sendSPI(0x2F, 0x03, 0x00);
    sendSPI(0x2E, 0x07, 0xFC);
    sendSPI(0x2D, 0xC0, 0xDF);
    sendSPI(0x2C, 0x1F, 0xA3);
    sendSPI(0x2B, 0x00, 0x00);
    sendSPI(0x2A, 0x00, 0x00);
    sendSPI(0x29, 0x00, 0x00);
    // block 7
    sendSPI(0x28, 0x00, 0x00);
    sendSPI(0x27, 0x03, 0xE8);
    sendSPI(0x26, 0x00, 0x00);
    sendSPI(0x25, 0x04, 0x04);
    sendSPI(0x24, 0x00, 0x46);
    sendSPI(0x23, 0x00, 0x04);
    sendSPI(0x22, 0x00, 0x00);
    sendSPI(0x21, 0x1E, 0x21);
    sendSPI(0x20, 0x03, 0x93);
    sendSPI(0x1F, 0x43, 0xEC);
    sendSPI(0x1E, 0x31, 0x8C);
    sendSPI(0x1D, 0x31, 0x8C);
    // block 8
    sendSPI(0x1C, 0x04, 0x88);
    sendSPI(0x1B, 0x00, 0x02);
    sendSPI(0x1A, 0x0D, 0xB0);
    sendSPI(0x19, 0x0C, 0x2B);
    sendSPI(0x18, 0x07, 0x1A);
    sendSPI(0x17, 0x00, 0x7C);
    sendSPI(0x16, 0x00, 0x01);
    sendSPI(0x15, 0x04, 0x01);
    sendSPI(0x14, 0xE0, 0x48);
    sendSPI(0x13, 0x27, 0xB7);
    sendSPI(0x12, 0x00, 0x64);
    sendSPI(0x11, 0x01, 0x2C);
    // block 9
    sendSPI(0x10, 0x00, 0x80);
    sendSPI(0x0F, 0x06, 0x4F);
    sendSPI(0x0E, 0x1E, 0x70);
    sendSPI(0x0D, 0x40, 0x00);
    sendSPI(0x0C, 0xC5, 0x01);
    sendSPI(0x0B, 0x00, 0x18);
    sendSPI(0x0A, 0x10, 0xD8);
    sendSPI(0x09, 0x16, 0x04);
    sendSPI(0x08, 0x20, 0x00);
    sendSPI(0x07, 0x40, 0xB2);
    sendSPI(0x06, 0xC8, 0x02);
    sendSPI(0x05, 0x50, 0xC8);
    // block 10
    sendSPI(0x04, 0x0A, 0x43);
    sendSPI(0x03, 0x06, 0x42);
    sendSPI(0x02, 0x05, 0x00);
    sendSPI(0x01, 0x08, 0x08);
    sendSPI(0x00, 0x25, 0x1C);
    }
    code is

      initial();
      delay(10);
      Reset();
      delay(10);
      Set_LO();
      delay(10);

    or maybe command is wrong?
  • 0 in reply to Chen yan-ting
    Intellectual 965 points

    comment:

    my ref clock is use 100Mhz and ppm is 25-50 ppm ,is it cause unstable or unlock?

  • 0 in reply to Chen yan-ting
    Intellectual 965 points

    This is my R110 register response

  • 0 in reply to Noel Fung
    Intellectual 965 points

    I am sure I can see the RF signal ,IF signal is 1.8Ghz and I can see the 13.3GHZ RF signal on Spectrum analysis.

    and current about 400mA, but the frequency like register data 0x1EA ,look like unstable. and drift....

  • 0 in reply to Chen yan-ting
    TI__Guru** 108330 points

    Hi Yan Ting,

    Based on your code, your configuration has output B powerdown and 7GHz at output A. 

    MUXOUT_LD_SEL is set to lock detect output, did you measure logic HIGH at MUXout pin?

    What is the Vtune voltage? If it is locked, it should be around 1.3V. 

    Can you share your schematic?

  • 0 in reply to Noel Fung
    Intellectual 965 points

    No, although I select MUXout of LD_SE pin, I can still get Readback signal when I give command, and its value is 0x1EA. I didn't measure Vtune voltage, but I saw it is always low in logic analysis, so I think it is just close to 0V.

  • 0 in reply to Noel Fung
    Intellectual 965 points

    I didn't have schematic, because this is someone design for me , I only can use software modify and test, to try function test... but when I try I found it is unstable and drift...

  • 0 in reply to Chen yan-ting
    Intellectual 965 points

    Singal like this look like unstable  and unlocked

  • 0 in reply to Chen yan-ting
    Intellectual 965 points

    Th is I read R111,R112 register Value. I am sure that Vtune voltage is near 9mv and Vcal freq look like zero...

    All the data information is proove that function look like failure only  converter a high freq ....

    So I think someone give me a code only can see a high frequency converter but it drift too much,

    I can't use this to send wirelses singal ...such qpsk or each other format of wireless singal...

    I have idea that could u supply a one or more demo code of register that Can Build 14GHz frequency and could lock frequency to me?

    Because I only need IF singal ia almost 1.8G~3Ghz ,and I neet to up_converter to 14GHz , only need this function.

    Because I search this 14Ghz demo code , Information is too less... I only need a correct demo and register table.

    I only modify the register and try I can know the function is correctly immediately.... please help .

    I only remain about 12 hours to finish this project ,so I need quickly....

  • 0 in reply to Chen yan-ting
    TI__Guru** 108330 points

    Hi Yan Ting,

    Here is the code.

    Fullscreen 2594HexRegisterValues.txt Download 
    R112	0x700000
R111	0x6F0000
R110	0x6E0000
R109	0x6D0000
R108	0x6C0000
R107	0x6B0000
R106	0x6A0000
R105	0x690021
R104	0x680000
R103	0x670000
R102	0x660000
R101	0x650011
R100	0x640000
R99	0x630000
R98	0x620000
R97	0x610888
R96	0x600000
R95	0x5F0000
R94	0x5E0000
R93	0x5D0000
R92	0x5C0000
R91	0x5B0000
R90	0x5A0000
R89	0x590000
R88	0x580000
R87	0x570000
R86	0x560000
R85	0x550000
R84	0x540000
R83	0x530000
R82	0x520000
R81	0x510000
R80	0x500000
R79	0x4F0000
R78	0x4E0003
R77	0x4D0000
R76	0x4C000C
R75	0x4B0800
R74	0x4A0000
R73	0x49003F
R72	0x480001
R71	0x470081
R70	0x46C350
R69	0x450000
R68	0x4403E8
R67	0x430000
R66	0x4201F4
R65	0x410000
R64	0x401388
R63	0x3F0000
R62	0x3E0322
R61	0x3D00A8
R60	0x3C0000
R59	0x3B0001
R58	0x3A9001
R57	0x390020
R56	0x380000
R55	0x370000
R54	0x360000
R53	0x350000
R52	0x340820
R51	0x330080
R50	0x320000
R49	0x314180
R48	0x300300
R47	0x2F0300
R46	0x2E07FD
R45	0x2DC8DF
R44	0x2C1FA3
R43	0x2B0000
R42	0x2A0000
R41	0x290000
R40	0x280000
R39	0x2703E8
R38	0x260000
R37	0x250404
R36	0x240046
R35	0x230004
R34	0x220000
R33	0x211E21
R32	0x200393
R31	0x1F03EC
R30	0x1E318C
R29	0x1D318C
R28	0x1C0488
R27	0x1B0002
R26	0x1A0DB0
R25	0x190C2B
R24	0x18071A
R23	0x17007C
R22	0x160001
R21	0x150401
R20	0x14E048
R19	0x1327B7
R18	0x120064
R17	0x11012C
R16	0x100080
R15	0x0F064F
R14	0x0E1E70
R13	0x0D4000
R12	0x0C5001
R11	0x0B0018
R10	0x0A10D8
R9	0x091604
R8	0x082000
R7	0x0740B2
R6	0x06C802
R5	0x0500C8
R4	0x040A43
R3	0x030642
R2	0x020500
R1	0x010808
R0	0x00251C

    This is configuration.

    Did you verify the 100MHz input clock? Does it look good?

  • 0 in reply to Noel Fung
    Intellectual 965 points

    no....seems hardware is wrong , I try you give me the code.

    and register is change 0EA from 1EA....

    I don't have any idea and clock we use this.... 100Mhz ak5 

  • 0 in reply to Chen yan-ting
    Intellectual 965 points

    ask a question, if my ref clcok is not exist, do i see the IF singal up-converter to 13.3 RF singal is it possible?

  • +1 in reply to Chen yan-ting
    TI__Guru** 108330 points

    Hi Yan Ting,

    AK5 is the reference clock, LVDS output, the connection is correct but the layout is very bad. 

    If you have a differential probe, probe across resistor R8, you should get 100MHz clock with 700mVpp to 800mVpp square wave signal. 

    We can program the device without a reference clock. To lock the PLL/VCO needs a valid reference clock, otherwise there will be output but the frequency is not correct.

  • 0 in reply to Noel Fung
    Intellectual 965 points

    I try to measure use osc with r8 , but I seem only see 1.2 voltage and not like square wave , maybe clock is didn't work... so I think that pll no locked maybe is no ref clock. But it still up converter...