AD5280 datasheet(24/28 Pages) AD

Part #	AD5280

Description	Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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24 / 28 page

AD5280/AD5282

Rev. C | Page 24 of

85pF

RDAC CIRCUIT SIMULATION MODEL

The internal parasitic capacitances and the external capacitive

loads dominate the ac characteristics of the RDACs. Configured

as a potentiometer divider, the −3 dB bandwidth of the AD5280

(20 kΩ resistor) measures 310 kHz at half scale. Figure 24

provides the Bode plot characteristics of the three available

resistor versions: 20 kΩ, 50 kΩ, and 200 kΩ. A parasitic

simulation model is shown in Figure 65. A macro model net list

for the 20 kΩ RDAC is provided.

25pF

RDAC

20kΩ

Figure 65. RDAC Circuit Simulation Model for RDAC = 20 kΩ

MACRO MODEL NET LIST FOR RDAC

.PARAM D=256, RDAC=20E3

.SUBCKT DPOT (A,W,B)

25E-12

RWA

{(1-D/256)*RDAC+60}

55E-12

RWB

{D/256*RDAC+60}

25E-12

.ENDS DPOT

AD5280 Datasheet(PDF) 24 Page - Analog Devices