Datasheet

AD9956
Rev. A | Page 25 of 32
Register Name
(Serial Address)
Bit Range (MSB) Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default Value/
Profile
<63:56> Open
1
Phase Offset Word 0 (POW0) <13:8> 0x00
<55:48> Phase Offset Word 0 (POW0) <7:0> 0x00
<47:40> Frequency Tuning Word 0 (FTW0) <47:40> 0x00
<39:32> Frequency Tuning Word 0 (FTW0) <39:32> 0x00
<31:24> Frequency Tuning Word 0 (FTW0) <31:24> 0x00
<23:16> Frequency Tuning Word 0 (FTW0) <23:16> 0x00
<15:8> Frequency Tuning Word 0 (FTW0) <15:8> 0x00
Profile Control Register
No. 0 (PCR0) (0x06)
<7:0> Frequency Tuning Word 0 (FTW0) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 1 (POW1) <13:8> 0x00
<55:48> Phase Offset Word 1 (POW1) <7:0> 0x00
<47:40> Frequency Tuning Word 1 (FTW1) <47:40> 0x00
<39:32> Frequency Tuning Word 1 (FTW1) <39:32> 0x00
<31:24> Frequency Tuning Word 1 (FTW1) <31:24> 0x00
<23:16> Frequency Tuning Word 1 (FTW1) <23:16> 0x00
<15:8> Frequency Tuning Word 1 (FTW1) <15:8> 0x00
Profile Control Register
No. 1 (PCR1) (0x07)
<7:0> Frequency Tuning Word 1 (FTW1) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 2 (POW2) <13:8> 0x00
<55:48> Phase Offset Word 2 (POW2) <7:0> 0x00
<47:40> Frequency Tuning Word 2 (FTW1) <47:40> 0x00
<39:32> Frequency Tuning Word 2 (FTW2) <39:32> 0x00
<31:24> Frequency Tuning Word 2 (FTW2) <31:24> 0x00
<23:16> Frequency Tuning Word 2 (FTW2) <23:16> 0x00
<15:8> Frequency Tuning Word 2 (FTW2) <15:8> 0x00
Profile Control Register
No. 2 (PCR2) (0x08)
<7:0> Frequency Tuning Word 2 (FTW2) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 3 (POW3) <13:8> 0x00
<55:48> Phase Offset Word 3 (POW3) <7:0> 0x00
<47:40> Frequency Tuning Word 3 (FTW3) <47:40> 0x00
<39:32> Frequency Tuning Word 3 (FTW3) <39:32> 0x00
<31:24> Frequency Tuning Word 3 (FTW3) <31:24> 0x00
<23:16> Frequency Tuning Word. 3 (FTW3) <23:16> 0x00
<15:8> Frequency Tuning Word 3 (FTW3) <15:8> 0x00
Profile Control Register
No. 3 (PCR3) (0x09)
<7:0> Frequency Tuning Word 3 (FTW3) <7:0> 0x00
1
In all cases, open bits must be written to 0.