Datasheet

AD9957 Data Sheet
Rev. C | Page 54 of 64
Table 17. Profile 7, RAM, GPIO Configuration, and GPIO Data Registers
Register Name
(Serial Address)
Bit Range
(Internal
Address)
Bit 7
(MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Bit 0
(LSB)
Default
Value
Profile 7
Register—
Single Tone
(0x15)
<63:56>
Open
Amplitude Scale Factor<13:8>
0x00
<55:48> Amplitude Scale Factor<7:0> 0x00
<47:40> Phase Offset Word<15:8> 0x00
<39:32>
Phase Offset Word<7:0>
0x00
<31:24> Frequency Tuning Word<31:24> 0x00
<23:16> Frequency Tuning Word<23:16> 0x00
<15:8> Frequency Tuning Word<15:8> 0x00
<7:0> Frequency Tuning Word<7:0> 0x00
Profile 7
Register—
QDUC (0x15)
<63:56> CCI Interpolation Rate<7:2>
Spectral
Invert
Inverse CCI
Bypass
0x00
<55:48> Output Scale Factor<7:0> 0x00
<47:40>
Phase Offset Word<15:8>
0x00
<39:32> Phase Offset Word<7:0> 0x00
<31:24> Frequency Tuning Word<31:24> 0x00
<23:16>
Frequency Tuning Word<23:16>
0x00
<15:8> Frequency Tuning Word<15:8> 0x00
<7:0> Frequency Tuning Word<7:0> 0x00
RAM Register
(0x16)
<31:0>
RAM Word<31:0>
GPIO
Configuration
Register (0x18)
<15:0> GPIO Configuration<15:0> 0x00
GPIO Data
Register (0x19)
<15:0> GPIO Data<15:0> 0x00