hmc834 BIST

Question

Hi 
 
 How do I use the BIST feature of the HMC834? 
 
 Regards 
 Yaron

ADIApproved · Accepted Answer

The HMC834 includes some functional BIST: 
 
 force charge pump output voltage high, low or mid rail (Reg 0x0B[11:9]) 
 short phase detector inputs (Reg 0x0B[3]) 
 route internal nodes to SDO pin (Reg 0x0F[4:0]) 
 
 and a digital signature generator to verify DSM logic. 
 The digital signature is generated by performing a soft reset (Reg 0x00=0x20) then configuring the part as usual but with the following changes: 
 
 set R >= 10 
 enable BIST (Reg 0x06[20:18]=001b) 
 set Reg 0x0A[14:13]=01b, Reg 0x0A[7:6]=01b and Reg 0x0A[15]=1 
 set N (Reg 0x03 and Reg 0x04) to any valid number. BIST will start after writing Reg 0x4. Each N value generates a unique signature. 
 Read the signature from Reg 0x013 after BIST busy=0 and compare to a known good part.

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hmc834 BIST

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