AD5231 datasheet(26/28 Pages) AD

Part #	AD5231

Description	Nonvolatile Memory, 1024-Position Digital Potentiometer

PDF	28 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

26 / 28 page

AD5231

Data Sheet

Rev. D | Page 26 of 28

RDAC CIRCUIT SIMULATION MODEL

The internal parasitic capacitances and the external load

dominates the ac characteristics of the RDACs. The −3 dB

bandwidth of the AD5231BRU10 (10 kΩ resistor) measures

370 kHz at half scale when configured as a potentiometer

divider. Figure 15 provides the large signal BODE plot charac-

teristics. A parasitic simulation mode is shown in Figure 57.

RDAC

10kΩ

50pF

Figure 57. RDAC Circuit Simulation Model for RDAC = 10 kΩ

The following code provides a macro model net list for the

10 kΩ RDAC:

.PARAM D = 1024, RDAC = 10E3

.SUBCKT DPOT (A, W, B)

50E-12

RWA

{(1-D/1024)* RDAC + 15}

50E-12

RWB

{D/1024 * RDAC + 15}

50E-12

.ENDS DPOT

AD5231 Datasheet(PDF) 26 Page - Analog Devices