DAC5686IPZP datasheet(44/46 Pages) TI

Part #	DAC5686IPZP

Description	16-BIT, 500-MSPS, 2X16X INTERPOLATING DUAL-CHANNEL DIGITAL-TO-ANALOG CONVERTER

PDF	46 Pages

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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C1 + t1 1 *

C2 +

1 * t2

R +

1(t3 * t2)

t1 +

dKVCO

(

tan f

) sec fd)

t2 +

d(tan fd

) sec fd)

t3 +

tan f

) sec fd

H(s) +

VCOKd(1 ) sRC1)

s3RC1C2 ) s

2(C1 ) C2)

f − Frequency − MHz

0.01

0.1

100

−20

−40

−60

N = 2, 4, 8, 16, 32

−180

−160

−140

−120

−100

f − Frequency − MHz

0.01

0.1

100

G005

DAC5686

SLWS147B – APRIL 2003 – REVISED AUGUST 2004

DAC5686 EVALUATION BOARD (continued)

Then

where

Example:

d = 70°, ωd = 1 MHz, GVCO = 300e6 MHz/A

R (

Ω)

C1 (

µF)

C2 (pF)

0.02

670

0.01

335

173

0.005

167

346

0.002

692

0.001

The calculated phase margin and loop bandwidth can be verified by plotting the gain and phase of the open-loop

transfer function given by

Figure 51 shows the open-loop gain and phase for the DAC5686 evaluation-board loop filter.

Figure 51. Open-Loop Phase and Gain Plots for DAC5686 Evaluation Board

DAC5686IPZP Datasheet(PDF) 44 Page - Texas Instruments

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