ADF5902

Data Sheet

Rev. 0 | Page 28 of 39

DB31 DB30

DB27

DB28

DB29

DB26 DB25 DB24 DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2

DB1

DB0

TDI

TRC

DS1

DS0

DO3

CONTROL

BITS

DO2

DO1

DO0 DW15 DW14 DW13 DW12 DW11 DW10 DW9 DW8 DW7 DW6 DW5 DW4 DW3 DW2 DW1 DW0

C4(1) C3(1) C2(1) C1(0)

C5(0)

DEVIATION WORD

DEVIATION OFFSET

DEVIATION

SEL

DW14

DW15

...

...

...

...

...

...

...

...

...

...

...

...

DW1 DW0

DEVIATION WORD

00

0

0

0

00

0

1

1

00

1

0

2

00

1

1

3

11

1

1

–1

11

1

0

–2

11

0

1

–

1

0

0

0

–32,768

01

1

1

32,767

..

.

.

.

..

.

.

.

DO3 DO3 DO1 DO0

DEV OFFSET

00

00

0

00

01

1

00

10

2

.

...

.

.

...

.

11

01

7

1

1

1

00

00

08

9

00

01

10

11

LOAD DEVIATION 0

LOAD DEVIATION 1

LOAD DEVIATION 2

LOAD DEVIATION 3

DEVIATION SEL

DS1

DS0

RESERVED

0

00

0

DISABLED

1

ENABLED

TRC

0CLK DIV

1

TDI Tx_DATA INV

TX RAMP CLK

Tx_DATA PIN

3

Figure 39. Register 14 (R14)

REGISTER 14

Control Bits

With Bits[C5:C1] set to 01110, Register R14 is programmed.

Figure 39 shows the input data format for programming this

register.

Reserved

Bits[DB29:DB27] are reserved and must be set as shown in

Figure 39.

TX_DATA Invert

When Bit DB31 is set to 0, events triggered by TX_DATA occur

on the rising edge of the TX_DATA pulse. When Bit DB31 is set

to 1, events triggered by TX_DATA occur on the falling edge of

the TX_DATA pulse.

TX_DATA Ramp Clock

When Bit DB30 is set to 0, the clock divider clock is used to

clock the ramp. When Bit DB30 is set to 1, the TX_DATA pin

is used to clock the ramp.

Deviation Select

Bits[DB26:DB25] select the deviation word to be loaded (see

Figure 39).

4-Bit Deviation Offset Word

Bits DB[24:21] determine the deviation offset word. The

deviation offset word affects the deviation resolution (see the

Ramp and Modulation section).

16-Bit Deviation Word

Bits[DB20:DB5] determine the signed deviation word in twos

complement format. The deviation word defines the deviation

step (see the Ramp and Modulation section).