Datasheet

AD9956
Rev. A | Page 26 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 4 (POW4) <13:8> 0x00
<55:48> Phase Offset Word 4 (POW4) <7:0> 0x00
<47:40> Frequency Tuning Word 4 (FTW4) <47:40> 0x00
<39:32> Frequency Tuning Word 4 (FTW4) <39:32> 0x00
<31:24> Frequency Tuning Word 4 (FTW4) <31:24> 0x00
<23:16> Frequency Tuning Word 4 (FTW4) <23:16> 0x00
<15:8> Frequency Tuning Word 4 (FTW4) <15:8> 0x00
Profile Control
Register
No. 4 (PCR4) (0x0A)
<7:0> Frequency Tuning Word 4 (FTW4) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 5 (POW5) <13:8> 0x00
<55:48> Phase Offset Word 5 (POW5) <7:0> 0x00
<47:40> Frequency Tuning Word 5 (FTW5) <47:40> 0x00
<39:32> Frequency Tuning Word 5 (FTW5) <39:32> 0x00
<31:24> Frequency Tuning Word 5 (FTW5) <31:24> 0x00
<23:16> Frequency Tuning Word 5 (FTW5) <23:16> 0x00
<15:8> Frequency Tuning Word 5 (FTW5) <15:8> 0x00
Profile Control
Register
No. 5 (PCR5) (0x0B)
<7:0> Frequency Tuning Word 5 (FTW5) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 6 (POW6) <13:8> 0x00
<55:48> Phase Offset Word 6 (POW6) <7:0> 0x00
<47:40> Frequency Tuning Word 6 (FTW6) <47:40> 0x00
<39:32> Frequency Tuning Word 6 (FTW6) <39:32> 0x00
<31:24> Frequency Tuning Word 6 (FTW6) <31:24> 0x00
<23:16> Frequency Tuning Word 6 (FTW6) <23:16> 0x00
<15:8> Frequency Tuning Word 6 (FTW6) <15:8> 0x00
Profile Control
Register
No. 6 (PCR6) (0x0C)
<7:0> Frequency Tuning Word 6 (FTW6) <7:0> 0x00
<63:56> Open
1
Phase Offset Word 7 (POW7) <13:8> 0x00
<55:48> Phase Offset Word 7 (POW7) <7:0> 0x00
<47:40> Frequency Tuning Word 7 (FTW7) <47:40> 0x00
<39:32> Frequency Tuning Word 7 (FTW7) <39:32> 0x00
<31:24> Frequency Tuning Word 7 (FTW7) <31:24> 0x00
<23:16> Frequency Tuning Word 7 (FTW7) <23:16> 0x00
<15:8> Frequency Tuning Word 7 (FTW7) <15:8> 0x00
Profile Control
Register
No. 7 (PCR7) (0x0D)
<7:0> Frequency Tuning Word 7 (FTW7) <7:0> 0x00
1
In all cases, open bits must be written to 0.