AD5231 datasheet(21/24 Pages) AD

Numer części	AD5231

Szczegółowy opis	Nonvolatile Memory, 1024-Position Digital Potentiometers

PDF	24 Pages

Scroll/Zoom	100%

Producent	AD [Analog Devices]

Strona internetowa	http://www.analog.com

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21 / 24 page

REV. 0

AD5231

–21–

Figure 31. Resistor Scaling with Pseudo Log Adjust-

ment Characteristics

RDAC CIRCUIT SIMULATION MODEL

The internal parasitic capacitances and the external load dominates

the ac characteristics of the RDACs. Configured as a potentiom-

eter divider the –3 dB bandwidth of the AD5231BRU10 (10 k

Ω

resistor) measures 370 kHz at half scale. TPC 10 provides the large

signal BODE plot characteristics. A parasitic simulation mode is

shown in Figure 32. Listing I provides a macro model net list for

the 10 k

Ω RDAC:

RDAC

10k

50pF

Figure 32. RDAC Circuit Simulation Model for

RDAC = 10 k

Ω

Listing I. Macro Model Net List for RDAC

.PARAM D = 1024, RDAC = 10E3

.SUBCKT DPOT (A, W, B)

50E-12

RAW

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

50E-12

RBW

{D/1024*RDAC+15}

50E-12

.ENDS DPOT

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