DAC5688 datasheet(23/55 Pages) TI

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EXTIO

Rbias

(DACA_gain ) 1)

vco +

(M)

(N)

ref

DAC5688

www.ti.com

SLLS880B – DECEMBER 2007 – REVISED MAY 2010

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

coarse_daca(3:0)

coarse_dacb(3:0)

coarse_daca(3:0)

Scales the output current is 16 equal steps.

coarse_dacb(3:0)

Same as above except for DACB.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reserved

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

PLL_m(4:0)

PLL_n(2:0)

PLL_m

M portion of the M/N divider of the PLL thermometer encoded:

PLL_m(4:0)

M value

00000

00001

00011

00111

01111

11111

All other values

Invalid

PLL_n

N portion of the M/N divider of the PLL thermometer encoded. If supplying a high rate CLK2/C frequency, the PLL_n value

should be used to divide down the input CLK2/C to maintain a maximum PFD operating of 160 MHz.

PLL_n(2:0)

n value

000

001

011

111

All other values

Invalid

PLL Function:

where ƒref is the frequency of the external DAC clock input on the CLK2/C pins

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