AD9958

Rev. 0 | Page 35 of 40

CHANNEL REGISTER MAP

Table 28.

Register Name

(Address)

Bit

Range

Bit 7 (MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

(LSB)

Bit 0

Defaul

t Value

Channel

(0x03)

<7:0>

Digital power-

down

DAC

power

down

Matched

pipe delays

active

Auto clear

sweep

accumulator

Clear sweep

accumulator

Auto clear

phase

accumulator

Clear phase

Sine

wave

output

enable

0x02

<15:8>

Linear sweep

no-dwell

Linear

sweep

enable

Load SRR

at I/O

Update

Open

Open

Must be 0

DAC full-scale current

control <9:8>

0x03

<23:16>

Amplitude freq. phase

select <23:22>

Open <21:16>

0x00

<7:0>

Frequency Tuning Word 0 <7:0>

0x00

<15:8>

Frequency Tuning Word 0 <15:8>

<23:16>

Frequency Tuning Word 0 <23:16>

Channel

Frequency Tuning

Word 01 (CTW0)

(0x04)

<31:24>

Frequency Tuning Word 0 <31:24>

<7:0>

Phase Offset Word 0

0x00

Channel Phase1

Offset Word 0

(CPW0) (0x05)

<15:8>

Open <15:14>

Phase Offset Word 0 <13:8>

0x00

<7:0>

Amplitude scale factor

0x00

<15:8>

Increment/decrement

step size <15:14>

Open

Amplitude

multiplier

enable

Ramp-up/

ramp-down

enable

Load ARR at I/O

update

Amplitude scale

factor <9:8>

0x00

Amplitude

Control (ACR)

(0x06)

<23:16>

Amplitude ramp rate <23:16>

–

<7:0>

Linear sweep rising ramp rate (RSRR) <7:0>

–

Linear Sweep

Ramp Rate1 (LSR)

(0x07)

<15:8>

Linear sweep falling ramp rate (FSRR) <15:8>

–

LSR Rising Delta1

(RDW) (0x08)

<7:0>

Rising delta word <7:0>

–

<15:8>

Rising delta word <15:8>

–

<23:16>

Rising delta word <23:16>

–

<31:24>

Rising delta word <31:24>

–

LSR Falling Delta1

(FDW) (0x09)

<7:0>

Falling delta word <7:0>

–

<15:8>

Falling delta word <15:8>

–

<23:16>

Falling delta word <23:16>

–

<31:24>

Falling delta word <31:24>

–

channel registers and profile registers are the same for each channel. Therefore, the channel enable bits determine if the channel’s channel registers and/or profile

registers are written to or not.

PROFILE REGISTER MAP

Table 29.

Register Name (address)

Bit Range

(MSB)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

(LSB)

Bit 0

Default

Value

Channel Word 1 (CTW1) (0x0A)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 2 (CTW2) (0x0B)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 3 (CTW3) (0x0C)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 3 (CTW4) (0x0D)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 5 (CTW5) (0x0E)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 6 (CTW6) (0x0F)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 7 (CTW7) (0x10)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 8 (CTW8) (0x11)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 9 (CTW9) (0x12)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 10 (CTW10) (0x13)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 11 (CTW11) (0x14)

<31:0>

Freq. Tuning Word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 12 (CTW12) (0x15)

<31:0>

Freq. Tuning Word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 13 (CTW13) (0x16)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 14 (CTW14) (0917)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–

Channel Word 15 (CTW15) (0x18)

<31:0>

Freq. tuning word <31:0> or phase word <31:18> or amplitude word <31:22>

–