I am developing a CW radar using the ADF4158+BGT24MTR11, the BGT24MTR11 is currently working and I am ready to set the lock frequency to 23.5GHZ(This frequency is divided by 16 and then input to the ADF4158),However, when I wrote the configuration information of the ADF4158, the modulation voltage output reached 3.2V, which was far beyond the VCO range of the BGT24MTR11。
REF_IN:10MHZ
Configuration information:
unsigned char R0[] = { 0x00, 0x24, 0xB8, 0x00}; // 23.50001 GHz
unsigned char R1[] = {0x02, 0x26, 0x00, 0x01}; // 23.50001 GHz
unsigned char R2[] = { 0x02, 0x00, 0xFD, 0x02};
unsigned char R3[] = { 0x00, 0x00, 0x00, 0x43};
unsigned char R4[] = { 0x00, 0x18, 0xF4, 0x04};
unsigned char R5_load1[] = { 0x00, 0x49, 0x40, 0x05};
unsigned char R5_load2[] = { 0x00, 0x80, 0x00, 0x7D};
unsigned char R6_load1[] = { 0x00, 0x00, 0x00, 0x56};
unsigned char R6_load2[] = { 0x00, 0x80, 0x00, 0x06};
unsigned char R7[] = { 0x00, 0x02, 0xFD, 0x07};
void ADF4158_config(void)
{
WriteToADF4158(R7);
WriteToADF4158(R6_load1);
WriteToADF4158(R6_load2);
WriteToADF4158(R5_load1);
WriteToADF4158(R5_load2);
WriteToADF4158(R4);
WriteToADF4158(R3);
WriteToADF4158(R2);
WriteToADF4158(R1);
WriteToADF4158(R0); //last one to be loaded (double-buffered).
}
23.5GHZ corresponding voltage range：
REF:10MHZ WAVEFORM