256-Position I
2
C Compatible
Dual, +15V, Digital Potentiometer
Evaluation Board User Manual
AD5282
JP12
JP13
Vin2
CP9
CP11
CP8
CP10
CP13 CP14
CP12
6
7
U3B
JP10
JP11
JP8
JP9
C20
0.1u
C21
10u
JP7
JP6
C18
0.1u
C19
10u
VCC
VEE
Vin1
2
1
4
8
U3A
CP2
CP4
CP1
CP3
CP6
CP7
CP5
5
+IN2
-IN2
OUT2
3
VDD
V+
OUT1
-IN1
+IN1
V
-
Opamp configuration
Figure 4. Detailed Opamp Connections
Powering the AD5282: Two Options for Powering
I. Using the power from the parallel port as VDD
Simply connect JP1 and JP2.
The voltage level will be whatever your parallel port operates at.
II. Using a separate supply
DO NOT connect JP1. Only connect JP2.
Connect voltage supply power and ground to the VDD and GND pads on the board.
Note: In both modes, VL will be supplied from the parallel port.
To use the part in a dual supply mode, instead of connecting JP2, connect JP3. Proceed to connect negative supply
to the VSS pad.
Configuring other Components
Two Channel Opamp - AD822
Positive Supply
To use the same VDD as the AD5282, connect JP6.
To use a separate positive supply, connect JP7 and apply positive supply(no more than +5V) to the VCC
pad.
Negative Supply
To use GND, simply connect JP8.
To use a negative supply, connect JP9 and apply negative supply to VEE pad.
Rev B 11/03/03
4
