ADF5902 datasheet(36/39 Pages) AD

36 / 39 page

ADF5902

Data Sheet

Rev. 0 | Page 36 of 39

TIME

DELAY 0

DELAY 1

DELAY 3

NOTES

- ALL DELAYS ARE OPTIONAL.

- DELAY 0 TO DELAY 3 ARE ENABLED BY REG 16, BITS[DB19].

- CONTINUOUS SAWTOOTH RAMP:

- RAMP MODE (REG 11, BITS[DB8:DB7]) MUST BE SET TO 0b00.

- SLOPE 0 AND 2 MUST BE PROGRAMMED (EVEN

IF SLOPE 0 AND SLOPE 2 ARE THE SAME).

- CONTINUOUS TRIANGULAR RAMP:

- RAMP MODE (REG 11, BITS[DB8:DB7]) MUST BE SET TO 0b10.

- SLOPE 0, SLOPE 1, SLOPE 2, AND SLOPE 3 MUST BE PROGRAMMED.

- SINGLE SAWTOOTH RAMP:

- RAMP MODE (REG 11, BITS[DB8:DB7]) MUST BE SET TO 0b01.

- SLOPE 0 MUST BE PROGRAMMED.

- SINGLE RAMP BURST:

- RAMP MODE (R11BITS[DB8:DB7]) MUST BE SET TO 0b11.

- SLOPE 0 MUST BE PROGRAMMED.

- SINGLE TRIANGULAR RAMP:

- RAMP MODE (REG 11, BITS[DB8:DB7]) MUST BE SET TO 0b11.

- SLOPE 0 AND SLOPE 1 MUST BE PROGRAMMED.

- SING FULL TRI (REG 11, BIT[DB9]) = 1.

- WHEN PROGRAMMING SLOPE 1 OR SLOPE 3, DEV WORD

MUST BE NEGATIVE TO DECREASE THE FREQUENCY.

- NEGATIVE VALUES ARE TWOS COMPLEMENT BINARY.

- X = DON’T CARE.

SLOPE 3

STEP SELECT (REG 15, BITS[DB26:DB25]) = 0b11

STEP WORD (REG 15, BITS[DB24:DB5]) = X

DEV SELECT (REG 14, BITS[DB26:DB25]) = 0b11

DEV OFFSET (REG 14, BITS[DB24:DB21]) = X

DEV WORD (REG 14, BITS[DB20:DB5]) = –X (NOTE: NEGATIVE)

CLK DIV MODE (REG 13, BITS[DB20:DB19]) = 0b11

CLK2 DIVIDER (REG 13, BITS[DB18:DB7]) = X

CLK2 DIV SELECT (REG 13, BITS[DB6:DB5]) = 0b11

DELAY 3

DELAY SELECT (REG 16, BITS[DB24:DB23]) = 0b11

RAMP DELAY (REG 16, BITS[DB19]) = 1

DELAY WORD (REG 16, BITS[DB16:DB5]) = X

SLOPE 2

STEP SELECT (REG 15, BITS[DB26:DB25]) = 0b10

STEP WORD (REG 15, BITS[DB24:DB5]) = X

DEV SELECT (REG 14, BITS[DB22:DB25]) = 0b10

DEV OFFSET (REG 14, BITS[DB24:DB21]) = X

DEV WORD (REG 14, BITS[DB20:DB5]) = X

CLK DIV MODE (REG 13, BITS[DB20:DB19]) = 0b11

CLK2 DIVIDER (REG 13, BITS[DB18:DB7]) = X

CLK2 DIV SELECT (REG 13, BITS[DB6:DB5]) = 0b10

SLOPE 1

STEP SELECT (REG 15, BITS[DB26:DB25]) = 0b01

STEP WORD (REG 15, BITS[DB24:DB5]) = X

DEV SELECT (REG 14, BITS[DB26:DB25]) = 0b01

DEV OFFSET (REG 14, BITS[DB24:DB21]) = X

DEV WORD (REG 14, BITS[DB20:DB5]) = –X (NOTE: NEGATIVE)

CLK DIV MODE (REG 13, BITS[DB20:DB19]) = 0b11

CLK2 DIVIDER (REG 13, BITS[DB18:DB7]) = X

CLK2 DIV SELECT (REG 13, BITS[DB6:DB5]) = 0b01

SLOPE 0

STEP SELECT (REG 15, BITS[DB26:DB25]) = 0b00

STEP WORD (REG 15, BITS[DB24:DB5]) = X

DEV SELECT (REG 14, BITS[DB26:DB25]) = 0b00

DEV OFFSET (REG 14, BITS[DB24:DB21]) = X

DEV WORD (REG 14, BITS[DB20:DB5]) = X

CLK DIV MODE (REG 13, BITS[DB20:DB19]) = 0b11

CLK2 DIVIDER (REG 13, BITS[DB18:DB7]) = X

CLK2 DIV SELECT (REG 13, BITS[DB6:DB5]) = 0b00

DELAY 2

DELAY SELECT (REG 16, BITS[DB24:DB23]) = 0b10

RAMP DELAY (REG 16, BITS[DB19]) = 1

DELAY WORD (REG 16, BITS[DB16:DB5]) = X

DELAY 1

DELAY SELECT (REG 16, BITS[DB24:DB23]) = 0b01

RAMP DELAY (REG 16, BITS[DB19]) = 1

DELAY WORD (REG 16, BITS[DB16:DB5]) = X

DELAY 0

DELAY SELECT (REG 16, BITS[DB24:DB23]) = 0b00

RAMP DELAY (REG 16, BITS[DB19]) = 1

DELAY WORD (REG 16, BITS[DB16:DB5]) = X

DELAY 0

DELAY 2

Figure 49. Ramp Sections

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