ADF5902

Data Sheet

Rev. 0 | Page 30 of 39

DB31 DB30 DB29 DB28 DB27 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

0

0

0

0

0

0

0

DSL1 DSL0

CONTROL

BITS

TR1

RD

DS11 DS10 DS9

DS8

DS7

DS6

DS5

DS4 DS3 DS2 DS1 DS0

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

DELAY START WORD

C5(1)

RESERVED

DEL SEL

DS11

DS10

...

DS1

DS0

DELAY START WORD

0

0

...

0

0

0

0

0

...

0

1

1

0

0

...

1

0

2

0

0

...

1

1

3

.

.

...

.

.

.

.

.

...

.

.

.

.

.

...

.

.

.

1

1

...

0

0

4092

1

1

...

0

1

4093

1

1

...

1

0

4094

1

1

...

1

1

4095

RD

RAMP DEL

TR1

T X DATA TRIGGER

0DISABLED

1

ENABLED

0DISABLED

1

ENABLED

0

00

01

10

11

LOAD DELAY 0

LOAD DELAY 1

LOAD DELAY 2

LOAD DELAY 3

DELAY SELECT

DSL1 DSL0

0

0

0

Figure 41. Register 16 (R16)

DB31 DB30 DB29 DB28 DB27 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

00

00

0

0

0

0

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

CONTROL

BITS

RESERVED

C5(1)

0

0

0

000

0

0

0

0

0

0

0

0

00

00

0

Figure 42. Register 17 (R17)

REGISTER 16

Control Bits

With Bits[C5:C1] set to 10000, Register R16 is programmed.

Figure 41 shows the input data format for programming this

register.

Reserved

Bits[DB31:DB25], Bits[DB22:DB21], and Bits[DB18:DB17] are

reserved and must be set as shown in Figure 41.

Delay Select

Bits[DB24:DB23] select the delay word to be loaded.

TX_DATA Trigger

When Bit DB20 is set to 1, a logic high on the TX_DATA pin

activates the ramp in conjunction with Bit DB29 of Register 5.

Synchronize the active edge of the pulse applied to the TX_

The pulse duration applied to the TX_DATA pin must be a

detector (PFD) frequency.

When Bit DB20 is set to 0, this function is disabled.

When activating continuous triangular or continuous sawtooth

ramps, a pulse applied to the TX_DATA pin is required after

Bit DB29 of Register 5 is toggled high. To stop the continuous

triangular or sawtooth ramps, a TX_DATA pulse is required

after Bit DB29 of Register 5 is toggled low.

When Bit DB20 is set to 0, this function is disabled.

Ramp Delay

When Bit DB19 is set to 1, the delay between ramps function is

enabled. When Bit DB19 is set to 0, this function is disabled.

12-Bit Delay Word

Bits[DB16:DB5] determine the delay word. The delay word

determines the duration of the ramp start delay.

REGISTER 17

The bits in Register 17 are reserved and must be programmed

as described in Figure 42 using a hexadecimal word of

0x00000011.