AD9954SLASHPCBZ1 datasheet(28/40 Pages) AD

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AD9954

Rev. B | Page 28 of 40

Table 13. Register Map—When Linear Sweep Enable Bit Is True (CFR1<21> = 1)

Note that the RAM Enable Bit CFR1<31> only activates the RAM itself, not the RAM segment control words.

(Serial Address)

Bit

Range

(MSB)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

(LSB)

Bit 0

Default

Value Or

Profile

Control

Function

(CFR1)

(0x00)

<7:0>

Digital

Power-

Down

Comp

Power-

Down

DAC

Power-

Down

Clock

Input

Power

Down

External

Power-

Down

Mode

Linear

Sweep

No Dwell

SYNC_CLK

Disable

Not

Used

0x00

<15:8>

SRR Load

Enable

AutoClr

Freq

Accum

AutoClr

Phase

Accum

Sine/

Cosine

Select

Clear

Freq

Accum

Clear

Phase

Accum

SDIO

Input

Only

LSB

First

0x00

<23:16>

Automatic

Sync

Enable

Software

Manual

Sync

Linear

Sweep

Enable

Not

Used

Not

Used

Not Used

Not

Used

0x00

<31:24>

RAM

Enable

RAM

Destination

Internal Profile Control<2:0>

Load ARR

Control

OSK

Enable

Auto

OSK

Enable

0x00

Control

Function

No. 2 (CFR2)

(0x01)

<7:0>

REFCLK Multiplier

VCO

Range

Charge Pump

Current<1:0>

0x00

<15:8>

Not Used

High

Speed

Sync

Enable

Hardware

Manual

Sync

Enable

XTAL

OUT

Enable

Not

Used

0x00

<23:16>

Not Used

0x18

Amplitude

Scale Factor

(ASF) (0x02)

<7:0>

(0x07)

Amplitude Scale Factor Register<7:0>

<15:8>

Auto Ramp Rate

Speed Control<1:0>

Amplitude Scale Factor Register<13:8>

Amplitude

Ramp Rate

(ARR) (0x03)

<7:0>

Amplitude Ramp Rate Register<7:0>

Frequency

Tuning

Word

(FTW0)

(0x04)

<7:0>

Frequency Tuning Word No. 0<7:0>

0x00

<15:8>

Frequency Tuning Word No. 0<15:8>

0x00

<23:16>

Frequency Tuning Word No. 0<23:16>

0x00

<31:24>

Frequency Tuning Word No. 0<31:24>

0x00

Phase Offset

Word (POW0)

(0x05)

<7:0>

Phase Offset Word No. 0<7:0>

0x00

<15:8>

Open<1:0>

Phase Offset Word No. 0<13:8>

0x00

Frequency

Tuning

Word (FTW1)

(0x06)

<7:0>

Frequency Tuning Word No. 1<7:0>

<15:8>

Frequency Tuning Word No. 1<15:8>

<23:16>

Frequency Tuning Word No. 1<23:16>

<31:24>

Frequency Tuning Word No. 1<31:24>

Negative

Linear

Sweep

Control

Word (NLSCW)

(0x07)

<7:0>

Falling Delta Frequency Tuning Word<7:0>

PS0 = 0

<15:8>

Falling Delta Frequency Tuning Word<15:8>

PS0 = 0

<23:16>

Falling Delta Frequency Tuning Word<23:16>

PS0 = 0

<31:24>

Falling Delta Frequency Tuning Word<31:24>

PS0 = 0

<39:32>

Falling Sweep Ramp Rate Word<7:0>

PS0 = 0

Positive

Linear

Sweep

Control

Word (PLSCW)

(0x08)

<7:0>

Rising Delta Frequency Tuning Word<7:0>

PS0 = 1

<15:8>

Rising Delta Frequency Tuning Word<15:8>

PS0 = 1

<23:16>

Rising Delta Frequency Tuning Word<23:16>

PS0 = 1

<31:24>

Rising Delta Frequency Tuning Word <31:24>

PS0 = 1

<39:32>

Rising Sweep Ramp Rate Word<7:0>

PS0 = 1

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