Hi,
I used LMX2820 to output signals from 7000MHz to 13200MHz in 2MHz steps. I test it a few times, and occasionally there was a unlock issue(bit 15-14 of R74 is 0x3,not 0x2), which was at 11310 and 12652MHz respectively. LMX2820 initialization configuration is as follows and the Instcal mode is not used. When changing the frequency, only a few registers 0x26, 0x27, 0x2a, 0x2b, 0x4e, 0x24 are modified. Please help check the reason of the unlock.
write 0x00,0x6432
write 0x00,0x6430
write 0x7A,0x0000
write 0x79,0x0000
write 0x78,0x0000
write 0x77,0x0000
write 0x76,0x0000
write 0x75,0x0000
write 0x74,0x0000
write 0x73,0x0000
write 0x72,0x0000
write 0x71,0x0000
write 0x70,0xFFFF
write 0x6F,0x0000
write 0x6E,0x001F
write 0x6D,0x0000
write 0x6C,0x0000
write 0x6B,0x0000
write 0x6A,0x0000
write 0x69,0x000A
write 0x68,0x0014
write 0x67,0x0014
write 0x66,0x0028
write 0x65,0x03E8
write 0x64,0x0533
write 0x63,0x19B9
write 0x62,0x1C80
write 0x61,0x0000
write 0x60,0x17F8
write 0x5F,0x0000
write 0x5E,0x0000
write 0x5D,0x1000
write 0x5C,0x0000
write 0x5B,0x0000
write 0x5A,0x0000
write 0x59,0x0000
write 0x58,0x03FF
write 0x57,0xFF00
write 0x56,0x0040
write 0x55,0x0000
write 0x54,0x0040
write 0x53,0x0F00
write 0x52,0x0000
write 0x51,0x0000
write 0x50,0x0100
write 0x4F,0x0008
write 0x4E,0x0001
write 0x4D,0x0608
write 0x4C,0x0000
write 0x4B,0x0000
write 0x4A,0x0000
write 0x49,0x0000
write 0x48,0x0000
write 0x47,0x0000
write 0x46,0x00FE
write 0x45,0x0011
write 0x44,0x0020
write 0x43,0x1000
write 0x42,0x003F
write 0x41,0x0000
write 0x40,0x0080
write 0x3F,0xC350
write 0x3E,0x0000
write 0x3D,0x03E8
write 0x3C,0x01F4
write 0x3B,0x1388
write 0x3A,0x0000
write 0x39,0x0001
write 0x38,0x0001
write 0x37,0x0002
write 0x36,0x0000
write 0x35,0x0000
write 0x34,0x0000
write 0x33,0x203F
write 0x32,0x0080
write 0x31,0x0000
write 0x30,0x4180
write 0x2F,0x0300
write 0x2E,0x0300
write 0x2D,0x487F
write 0x2C,0x7DBF
write 0x2B,0x0032
write 0x2A,0x0000
write 0x29,0x0000
write 0x28,0x0000
write 0x27,0x00c8
write 0x26,0x0000
write 0x25,0x0500
write 0x24,0x001C
write 0x23,0x3100
write 0x22,0x0010
write 0x21,0x0000
write 0x20,0x1001
write 0x1F,0x0401
write 0x1E,0xB18C
write 0x1D,0x318C
write 0x1C,0x0639
write 0x1B,0x8001
write 0x1A,0x0DB0
write 0x19,0x0624
write 0x18,0x0E34
write 0x17,0x1102
write 0x16,0xE2BF
write 0x15,0x1C64
write 0x14,0x272C
write 0x13,0x2120
write 0x12,0x0000
write 0x11,0x15C0
write 0x10,0x171C
write 0x0F,0x2001
write 0x0E,0x3001
write 0x0D,0x0038
write 0x0C,0x0408
write 0x0B,0x0612
write 0x0A,0x0000
write 0x09,0x0005
write 0x08,0xC802
write 0x07,0x0000
write 0x06,0x0A43
write 0x05,0x0032
write 0x04,0x4204
write 0x03,0x0041
write 0x02,0x8FFE
write 0x01,0x57A0
write 0x00,0x6430
wait 10ms to allow internal LDO Powers up.
write 0x00,0x6430
