EVAL-AD5263EBZ Analog Devices Inc, EVAL-AD5263EBZ Datasheet - Page 22

• Manufacturer Part Number: EVAL-AD5263EBZ
• Description: EVALUATION BOARD I.C.
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5263EBZ

• Main Purpose: Digital Potentiometer
• Embedded: No
• Utilized Ic / Part: AD5263
• Primary Attributes: 4 Channel, 256 Position
• Secondary Attributes: I²C & SPI Interfaces
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5263
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 AD5263
(20 kΩ resistor) measures 300 kHz at half scale. Figure 22
provides the large signal BODE plot characteristics of the
three available resistor versions: 20 kΩ, 50 kΩ, and 200 kΩ. A
parasitic simulation model is shown in Figure 56. The following
code provides a macro model net list for the 20 kΩ RDAC.
Figure 56. RDAC Circuit Simulation Model for RDAC = 20 k
A
25pF
C
A
RDAC
20kΩ
W
55pF
C
W
25pF
C
B
B
Ω
Rev. B | Page 22 of 28
Listing 1. Macro Model Net List for RDAC
.PARAM D=256, RDAC=20E3
*
.SUBCKT DPOT (A,W,B)
*
CA
RWA
CW
RWB
CB
*
.ENDS DPOT
A
A
W
W
B
0
W
0
B
0
25E-12
{(1-D/256)*RDAC+60}
55E-12
{D/256*RDAC+60}
25E-12