Analog Devices AD5162 User manual

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

5 Steps To Setup The Evaluation Board…

5. Measure Result

W

B

4. Provide Power Suppl

y

O

r

Use

Power from Parallel Port

GND +5V

No Programming

Skills Required!

Figure 1. Evaluation Kit Setup

2. Configure Board and Connect to Parallel Port with

Provided Parallel Cable

1. Install AD5162 Software

3. Open AD5162 RevA.exe

Rev B 11/03/03

1

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

General Overview

This evaluation board provides the user with a simple and quick solution to evaluate digital potentiometers from

Analog Devices. Only one digital pot can be placed on the board at a time. For the user’s convenience, a general

purpose opamp, 2.5V voltage reference, and two power MOSFETs are included and can be configured in a variety of

flexible configurations. The digital pot can be used by itself or in conjunction with these other components.

How to Get Started

1. Click on the Install Software link in the Digital POT CD browser or setup.exe if you don’t have the CD browser.

2. Configure board to your liking(refer to “Configuring Other Components” on page 4 for more details). A two

channel opamp(AD822B), 2.5V reference(ADR03), and two power mosfets(FDV301N) are provided for your

convenience. If you would simply like to evaluate the digital pot, then ignore Step 2 and proceed to Step 3.

3. Apply a separate power supply or use power from the parallel port(refer to “Powering the AD5162” on page 4 to

avoid damaging the part).

4. Connect board to parallel port with provided parallel cable.

5. Open the AD5162 Rev A program from the Windows Start – Program. Move scroll bar to program resistance

settings. The operation is self-explanatory.

Figure 2. AD5162 Software Graphic al Interface

Rev B 11/03/03

2

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

12

VDD

B1

A1

W1

SDO

A1

W1

B1

VDD

SHDN

CLK/SCL

SDI/SDA

A2

W2

B2

VL

VSS

DGND

VDD

CS/AD0

SDO

A1

W1

B1

VDD

SHDN

CLK/SCL

SDI/SDA

A2

W2

B2

NC/O2

VSS

DGND

RES/AD1

CS/AD0

4 5

6

7

8

3

5

7

8

9

10

6

4 5

6

7

8

3 4

5

6

7

8

9

10

6

7

8

9

10

6

B3

A3

W3

VDD

DIS

DGND

VL

SDI/SDA

CLK/SCL CS/AD0

RES/AD1

SHDN

B2

SDO

NC/O2

VSS

W4

A4

B4

W2

A2

W1

VDD

DGND

CLK/SCL

A1

B1

CS/AD0

SDI/SDA

A1

B1

CS/AD0

SDO

SDI/SDA

W1

VDD

DIS

DGND

CLK/SCL

W1

VDD

DGND

CLK/SCL

A1

B1

CS/AD0

SDI/SDA

W1

B2

CS/AD0

SDI/SDA

CLK/SCL

B1

A1

W2

DGND

VDD

W1

B2

A2

SDI/SDA

CLK/SCL

B1

A1

W2

DGND

VDD

DGND

CLK/SCL

A1

W1

SDI/SDA

VDD

3 4

5

6VDD

DGND

CLK/SCL

B1

W1

SDI/SDA

W1 W2

SDO

A1

W1

B1

VDD

SHDN

CLK/SCL

SDI/SDA

A2

W2

B2

VL

VSS

DGND

RES/AD1

CS/AD0

2

7

8

9

10

6

B1

CS/AD0

W2

DGND

VDD

W1

B2

RES/AD1

SDI/SDA

CLK/SCL

VDD

OUT1

-I N1

V- +IN2

-I N2

OUT2

V+

+IN1

B2

W1

A2

B2

W1

1 2 3 45

5

4321

D

C

B

A

B1

1

A1

2

W1

3

B3

4

A3

5

W3

6

VDD

7

GND

8

VSS

18

W4

19

A4

20

B4

21

W2

22

A2

23

B2

24

NC/O2

17

DIS

9

SDO/O1

16

SHDN

15

RESB/AD1

14

CS/AD0

13

VLOGIC

10

SDI/SDA

11

CLK/SCL

U1

AD5263

R13

10k

R12

10k

C1

10u

VDD

W1

B1

W2

A2

B2

JP4

AGND

A1

C2

0.1u

JP5

Temp

1

Vout

4

Trim

5

GND

2

Vin

3

U12

ADR03

C3

0.1u

SDO

1

CS

9

A1

2

A2

16

W1

3

W2

15

B1

4

B2

14

VDD

5

VL

13

SHDN

6

VSS

12

CLK

7

GND

11

SDI

8

PR

10

U3

AD5 26 2

O1

1

A1

2

W1

3

B1

4

VDD

5

SHDN

6

SCL

7

SDA

8

AD1

10

GND

11

VSS

12

O2

13

B2

14

W2

15

A2

16

AD0

9

U4

AD5 24 2

W

1

VDD

2

GND

3

CLK SDI

CS

B

A

U7

AD5160

A

1

B

2

CS/AD0

SDO/NC

4

SDI/SDA

GND

SPI/I2C

VDD

W

CLK/SCL

U9

AD5161

W

1

VDD

2

GND

3

SCL SDA

AD0

B

A

U8

AD5 24 5

VDD

1

GND

2

SCL SDA

W

A

U5

AD5 24 7

B1

1

A1

2

W2

3

GND

4

VDD

5

SDA

SCL

U1 0

AD5 24 3

B1

1

A1

2

W2

3

GND

4

VDD

5

SDI

CS

B2

W1

CLK

U11

AD5 16 2

CS/AD0

CLK/SCL

SDI/SDA

RES/AD1

C5

0.1u

C6

0.1u

C7

0.1u

C8

0.1u

C9

0.1u

C10

0.1u

C11

0.1u

C12

0.1u

C13

0.1u

C14

0.1u

C4

0.1u

VDD

1

GND

2

SCL SDA

W

B

U6

AD5 24 6

R11

10k

DIS

JP2

JP3

C16

0.1u

C17

10u

VSS

W4

A4

B4B3

A3

W3

Q1

FDV301

JP14

Q2

FDV301

JP15

D1 D2

CP16 CP18

O2

DGND

DGNDPAD

R15

10k

R14

10k

VREF

CP15 CP17

1

14

2

15

3

16

4

17

5

18

6

19

7

20

8

21

9

22

10

23

11

24

12

25

13

J1

DB2 5

R1

220

R6

100

R3

100

R4

100

R5

100

R2

220

R7

100

SHDN

R8

100

R10

10k

SDO/O1

R16

10k

JP1

R9

470

O1

1

A1

2

W1

3

B1

4

VDD

5

SHDN

6

SCL

7

SDA

8

AD1

10

GND

11

VSS

12

VL

13

B2

14

W2

15

A2

16

AD0

9

U2

AD5282

B1

1

AD0

W2

3

GND

4

VDD

5

SDA

AD1

SCL

U1 4

AD5 24 8

C15

0.1u

OUT1

1

-I N1

2

+IN1

3

V-

4

+IN2

5

-IN2

6

OUT2

7

V+

8

U3 A

U3 B

U13

AD822

FDV301N Power FETs

AD822 Dual Opamp

ADR03 2.5V Reference

Figure 3. Evaluation Board Schematic

Rev B 11/03/03

3

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

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

48

U3A

CP2 CP4

CP1 CP3

CP6 CP7

CP5

5

+IN2

-IN2

OUT2

3

VDD

V+

OUT1

-IN1

+IN1

V-

O

p

am

p

confi

g

uration

Figure 4. Detailed Opamp Connections

Powering the AD5162: Two Options for Powering

I. Using the power from the parallel port as VDD

Simply connect JP1.

The voltage level will be whatever your parallel port operates at.

II. Using a separate supply

DO NOT connect JP1.

Connect voltage supply power and ground to the VDD and GND pads on the board.

Configuring other Components

Two Channel Opamp - AD822

Positive Supply

To use the same VDD as the AD5162, connect JP6.

To use a separate positive supply, connect JP7 and apply positive supply(no more than +15V) 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.

For more details on connecters and jumpers around the opamp, refer to Figure 4.

Rev B 11/03/03

4

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

2.5V Voltage Reference – ADR03

By connecting JP5, the voltage reference is connected to the A-terminal of channel-1 of the AD5162. You don’t need

to worry about applying VDD because it is hardwired from the same source that is powering the AD5162.

Power Mosfets – FDV301N

Q1

By connecting JP14, the wiper of channel-1 is connected to the gate of Q1. CP15 can be used to place a resistor

between the drain and pad D1. CP16 can be used to place a degenerative resistor between the source and GND.

Q2

By connecting JP15, the wiper of channel-2 is connected to the gate of Q2. CP17 can be used to place a resistor

between the drain and pad D2. CP18 can be used to place a degenerative resistor between the source and GND.

Rev B 11/03/03

5

256-Position SPI Compatible

Dual Digital Potentiometer

Evaluation Board User Manual

AD5162

AD5162 Parallel Port Connection (Information for Visual Basic Program Developers Only)

SHDN VDD DIS RES/AD1 CLK/SCL

CS/AD0

SDI/SDA

SDO/O1

DGND

SDA_Read

http://www.doc.ic.ac.uk/~ih/doc/par/

8 output pins accessed via the DATA Port portID = Val("&H" + "378") [378h = 888]

5 input pins (one inverted) accessed via the STATUS Port portID = Val("&H" + "379") [379h = 889]

4 output pins (three inverted) accessed via the CONTROL Port portID = Val("&H" + "37A") [37Ah = 890]

The remaining 8 pins are grounded

TIMING DEFINATION IN VISUAL BASIC SOURCE CODE cmdRUN

N

o Activity Latch Data

Send out

BIT_TOGO=0

Decimal Code

bit 0

(

Pin 2

)

bit 1

(

Pin 3

)

bit 2

(

Pin 4

)

Binary Code

1100 1001 1011 1000 1010 1100

12 9 11 8 10 12

SDI

CLK

/CS

Rev B 11/03/03

6

Analog Devices AD5162 User manual

Analog Devices AD5162 User manual

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