ad5231 Analog Devices, Inc., ad5231 Datasheet - Page 26

• Manufacturer Part Number: ad5231
• Description: Nonvolatile Memory, 1024-position Digital Potentiometer
• Manufacturer: Analog Devices, Inc.

AD5231
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.
Figure 57. RDAC Circuit Simulation Model for RDAC = 10 kΩ
A
50pF
C
A
RDAC
10kΩ
W
50pF
C
W
C
50pF
B
B
Rev. C | Page 26 of 28
The following code provides a macro model net list for the
10 kΩ RDAC:
.PARAM D = 1024, RDAC = 10E3
*
.SUBCKT DPOT (A, W, B)
*
CA
RWA
CW
RWB
CB
*
.ENDS DPOT
A
A
W
W
B
0
W
0
B
0
50E-12
{(1-D/1024)* RDAC + 15}
50E-12
{D/1024 * RDAC + 15}
50E-12