Analog Devices AD9739 Manual page 36

AD9739
Bit Name Read/Write
Retry Read/write
Search_Tol Read/write
Mu_LOST Read
Mu_LKD Read
Table 30. Analog Controller Registers (Register 0x32, Register 0x33)
Register
1
Name Address
ANA_CNT1 0x32 50
ANA_CNT2 0x33 51
1 The two-digit number is the decimal representation of the address.
Table 31. Analog Controller Register Bit Descriptions
Bit Name Read/Write
MSEL[1:0] Write
HDRM[7:0] Write
Description
0x0: if the correct value is not found, the search stops.
0x1: if the correct value is not found, the search begins again.
0x0: not exact (can find a phase within two values of the desired phase).
0x1: finds the exact phase that is targeted (optimal setting).
0x0: mu controller has not lost lock.
0x1: mu controller has lost lock.
0x0: mu controller is not locked.
0x1: mu controller is locked.
Bit 7 Bit 6
HDRM[7] HDRM[6]
N/A N/A
Description
0x0: mirror roll-off frequency control = bypass.
0x1: mirror roll-off frequency control = narrowest bandwidth.
0x2: mirror roll-off frequency control = medium bandwidth.
0x3: mirror roll-off frequency control = widest bandwidth.
See the plot in the Analog Control Registers section.
0xCA: output stack headroom control.
HDRM[7:4]: set the reference offset from AVDD33 (VCAS centering).
HDRM[3:0]: set the overdrive (current density) trim (temperature tracking).
Bit 5 Bit 4 Bit 3
HDRM[5] HDRM[4] HDRM[3]
N/A N/A N/A
Rev. A | Page 36 of 56
Reset Value for
Write Register
0x0
0x0
0x0
0x0
Bit 2 Bit 1 Bit 0
HDRM[2] HDRM[1] HDRM[0]
N/A MSEL[1] MSEL[0]
Reset Value for Write Register
0x03
0xCA