evaluation board for the adn2850 digital rheostat · 2017. 2. 15. · evaluation board user guide...

16
Evaluation Board User Guide UG-276 One Technology Way P.O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 www.analog.com Evaluation Board for the ADN2850 Digital Rheostat PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 16 FEATURES Full featured evaluation board for the ADN2850 Several test circuits Various ac/dc input signals PC control via a separately purchased system development platform (SDP) PC control software 26 extra bytes in EEMEM for user-defined information Resistor tolerance error stored in EEMEM PACKAGE CONTENTS EVAL-ADN2850SDZ evaluation board CD that includes Self-installing software that allows users to control the board and exercise all functions of the device Electronic version of the ADN2850 data sheet Electronic version of the UG-276 document GENERAL DESCRIPTION This user guide describes the evaluation board for evaluating the ADN2850—a dual-channel, 1024-position, nonvolatile memory digital resistor. With versatile programmability, the ADN2850 allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment/decrement of resistance, resistance changes in ±6 dB scales, wiper setting read- back, and extra EEMEM for storing user-defined information, such as memory data for other components or a lookup table. The ADN2850 supports a dual-supply ±2.25 V to ±2.75 V operation and a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications. In addition, the ADN2850 uses a versatile SPI-compatible serial interface, allowing speeds of up to 50 MHz. The EVAL-ADN2850SDZ can operate in single-supply and dual-supply mode and incorporates an internal power supply from the USB. Complete specifications for the ADN2850 part can be found in the ADN2850 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board. DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEMONSTRATION PLATFORM EVAL-ADN2850SDZ 09842-001 SYSTEM DEMONSTRATION PLATFORM Figure 1.

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Page 1: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluation Board for the ADN2850 Digital Rheostat

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 16

FEATURES Full featured evaluation board for the ADN2850 Several test circuits Various ac/dc input signals PC control via a separately purchased system development

platform (SDP) PC control software 26 extra bytes in EEMEM for user-defined information Resistor tolerance error stored in EEMEM

PACKAGE CONTENTS EVAL-ADN2850SDZ evaluation board CD that includes

Self-installing software that allows users to control the board and exercise all functions of the device

Electronic version of the ADN2850 data sheet Electronic version of the UG-276 document

GENERAL DESCRIPTION This user guide describes the evaluation board for evaluating the ADN2850—a dual-channel, 1024-position, nonvolatile memory digital resistor. With versatile programmability, the ADN2850 allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment/decrement of resistance, resistance changes in ±6 dB scales, wiper setting read-back, and extra EEMEM for storing user-defined information, such as memory data for other components or a lookup table.

The ADN2850 supports a dual-supply ±2.25 V to ±2.75 V operation and a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications. In addition, the ADN2850 uses a versatile SPI-compatible serial interface, allowing speeds of up to 50 MHz.

The EVAL-ADN2850SDZ can operate in single-supply and dual-supply mode and incorporates an internal power supply from the USB.

Complete specifications for the ADN2850 part can be found in the ADN2850 data sheet, which is available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board.

DIGITAL PICTURE OF EVALUATION BOARD WITH SYSTEM DEMONSTRATION PLATFORM

EVAL-ADN2850SDZ

0984

2-00

1

SYSTEM DEMONSTRATIONPLATFORM

Figure 1.

Page 2: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 2 of 16

TABLE OF CONTENTS Features .............................................................................................. 1 Package Contents .............................................................................. 1 General Description ......................................................................... 1 Digital Picture of Evaluation Board with System Demonstration Platform.................................................................. 1 Revision History ............................................................................... 2 Evaluation Board Hardware ............................................................ 3

Power Supplies .............................................................................. 3 Link Options ................................................................................. 3

Test Circuits ...................................................................................4 Evaluation Board Software ...............................................................6

Installing the Software ..................................................................6 Running the Software ...................................................................6 Software Operation .......................................................................7

Evaluation Board Schematics and Artwork ...................................8 Ordering Information .................................................................... 14

Bill of Materials ........................................................................... 14

REVISION HISTORY 5/11—Revision 0: Initial Version

Page 3: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 3 of 16

EVALUATION BOARD HARDWARE POWER SUPPLIES The EVAL-ADN2850SDZ supports the use of single and dual power supplies.

In single-supply mode, the evaluation board can be powered either from the SDP port or externally by the J1-1, J1-2, and J1-3 connectors, as described in Table 1.

If dual-supply mode is required, the J1-1, J1-2, and J1-3 connectors must provide the external power supply, as described in Table 1.

All supplies are decoupled to ground using 10 µF tantalum and 0.1 µF ceramic capacitors.

Table 1. Maximum and Minimum Voltages of the Connectors Connector No. Label Voltage J1-1 EXT VDD Analog positive power supply, VDD. For single-supply operation, it is

2.7 V to 5.5 V. For dual-supply operation, it is

2.5 V to 2.75 V. J1-2 GND Analog GND. J1-3 EXT VSS Analog negative power supply, VSS. For single-supply operation, it is 0 V. For dual-supply operation, it is

−2.5 V to −2.75 V.

LINK OPTIONS Several link and switch options are incorporated in the evalu-ation board and should be set up before using the board. Table 2 describes the positions of the links to control the evaluation board by a PC, via the SDP board, using the EVAL-ADN2850SDZ in single-supply mode. The functions of these link and switch options are described in detail in Table 3 through Table 6.

Table 2. Link Options Setup for SDP Control (Default) Link No. Option A25 3.3 V A24 GND

Table 3. Link Functions Link No. Power Supply Options A25 VDD This link selects one of the following as the positive power supply: 5 V (from SDP). 3.3 V (from SDP). EXT (external supply from the J1-1 connector). A24 VSS This link selects one of the following as the negative power supply: GND (analog ground). VSS (external supply from the J1-3 connector).

Page 4: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 4 of 16

TEST CIRCUITS The EVAL-ADN2850SDZ incorporates several test circuits to evaluate the ADN2850 performance.

Pseudologarithmic DAC

RDAC1 can be operated as a pseudologarithmic DAC, as shown in Figure 2.

VDD – VSS2

VDD – VSS2

W1RDAC1

R344.7kΩ

R35

W1

A1

AC + DC

EXTERNALCONNECTION

VDD

DC

VSS

GND

B1BUF_W1

W1_BUF

VDD

VSS

B109

842-

002

Figure 2. Pseudologarithmic DAC

The output voltage plot is shown in Figure 3. The output voltage is relative to VDD and VSS.

1.0

0.8

0.6

0.4

0.2

00 200 400 600 800 1000

DECIMAL CODE

REL

ATI

VE O

UTP

UT

VOLT

AG

E

0984

2-01

9

Figure 3. Pseudologarithmic Gain

Table 4 shows the options available for the voltage references.

Table 4. Pseudologarithmic DAC Voltage References Terminal Link Options Description A1 A20 AC + DC Connects R34 to (VDD − VSS)/2 VDD Connects R34 to VDD W1 BUF_W1 Connects Terminal W1 to an

output buffer B1 A21 DC Connects Terminal B1 to

(VDD − VSS)/2 VSS Connects Terminal B1 to VSS GND Connects Terminal B1 to

analog ground

The output voltage is defined in Equation 1.

REF2WB1

WB1REF2REF1OUT V

R34RR

VVV ++

×−= )( (1)

kΩ251024

×=RDAC1RWB1 (2)

where: RWB1 is the resistor between the W1 and B1 terminals. VREF1 is the top voltage reference (A20 link). VREF2 is the bottom voltage reference (A21 link). RDAC1 is the code loaded in the RDAC1 register.

Pseudoantilogarithmic DAC

RDAC1 can be operated as a pseudoantilogarithmic DAC, as shown in Figure 4. In this case, R35 must be changed from the populated value of 0 Ω resistance to the suggested value of 4.7 kΩ.

W1RDAC1

R344.7kΩ

R354.7kΩ

W1

A1

AC + DC

EXTERNALCONNECTION

DC

GND

B1BUF_W1

W1_BUF

VDD

VSS

B1

0984

2-00

3

VDD – VSS2

VDD – VSS2

VDD

VSS

Figure 4. Pseudoantilogarithmic DAC.

The output voltage plot is shown in Figure 5. The output voltage is relative to VDD and VSS.

1.0

0.8

0.6

0.4

0.2

00 200 400 600 800 1000

DECIMAL CODE

REL

ATI

VE O

UTP

UT

VOLT

AG

E

0984

2-02

0

Figure 5. Pseudoantilogarithmic Gain

Page 5: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 5 of 16

Table 5 shows the options available for the voltage references.

Table 5. Pseudoantilogarithmic DAC Voltage References Terminal Link Options Description A1 A20 AC + DC Connects Terminal W1

to (VDD − VSS)/2 VDD Connects Terminal W1 to VDD W1 BUF_W1 Connects Terminal W1 to an

output buffer B1 A21 DC Connects R35 to (VDD − VSS)/2 VSS Connects R35 to VSS GND Connects R35 to analog

ground

The output voltage is defined in Equation 3.

REF2WB1

REF2REF1OUT VR35R

R35VVV ++

×−= )( (3)

kΩ251024

×=RDAC1RWB1 (4)

where: RWB1 is the resistor between the W1 and B1 terminals. VREF1 is the top voltage reference (A20 link). VREF2 is the bottom voltage reference (A21 link). RDAC1 is the code loaded in the RDAC1 register.

Signal Amplifier

RDAC2 can be operated as an inverting or noninverting signal amplifier supporting linear gains. Table 6 shows the available configurations.

Table 6. Amplifier Selection Link Options Amplifier Gain Link Label Noninverting Linear A27 LINEAR A29 NON-INVERTING A30 NON-INVERTING Inverting Linear A27 LINEAR A29 INVERTING A30 INVERTING

The noninverting amplifier with linear gain is shown in Figure 6, and the gain is defined in Equation 3.

R38R

G WB2+=1 (4)

where RWB2 is the resistor between the W2 and B2 terminals.

W2

RDAC2

B2

W2 OAVOUT

VOUT

VIN

R42

R41, 1.7kΩ

R38, 2.7kΩC1

10nF

B2

0984

2-00

4

Figure 6. Linear Noninverting Amplifier

R42 can be used to set the maximum and minimum gain limits.

The inverting amplifier with linear gain is shown in Figure 7, and the gain is defined in Equation 5.

R38R

G WB2−= (5)

where RWB2 is the resistor between the W2 and B2 terminals.

W2

RDAC2

B2

W2 OAVOUT

VOUTVIN

R42

R41, 1.7kΩ

R38, 2.7kΩC1

10nF

B2

0984

2-00

5

Figure 7. Linear Inverting Amplifier

R42 can be used to set the maximum and minimum gain limits.

Current Monitoring Configurable Function

The ADN2850 comes with a pair of matched diode connected PNPs (Q1 and Q2) accessible from external pins (I1 and I2); test points (V1 and V2) allow direct access to these pins, as shown in Figure 8.

V1

V2

I1

I2

CURRENTMONITOR

0984

2-00

6

Figure 8. Current Monitoring

The ADN2850 data sheet provides a detailed description how to use these current monitor terminals.

Page 6: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 6 of 16

EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE The EVAL-ADN2850SDZ evaluation kit includes evaluation board software provided on a CD. The software is compatible with Windows® XP, Windows Vista, and Windows 7 (both 32 and 64 bits).

Install the software before connecting the SDP board to the USB port of the PC to ensure that the SDP board is recognized when it is connected to the PC.

1. Start the Windows operating system and insert the CD. 2. The installation software opens automatically. If it does

not, run the setup.exe file from the CD. 3. After installation is completed, power up the evaluation

board as described in the Power Supplies section. 4. Plug the EVAL-ADN2850SDZ into the SDP board and

the SDP board into the PC using the USB cable included in the box.

5. When the software detects the evaluation board, follow the instructions that appear to finalize the installation.

To uninstall the program, click Start > Control Panel > Add or Remove Programs > ADN2850 Eval Board.

RUNNING THE SOFTWARE To run the evaluation board software, do the following:

1. Click Start > All Programs > Analog Devices > ADN2850 > ADN2850 Eval Board.

2. If the SDP board is not connected to the USB port when the software is launched, a connectivity error is displayed (see Figure 9). Connect the evaluation board to the USB port of the PC, wait a few seconds, click Rescan, and follow the instructions.

0984

2-00

7

Figure 9. Pop-Up Window Error

The main window of the EVAL-ADN2850SDZ evaluation software then opens, as shown in Figure 10.

0984

2-00

8

Figure 10. EVAL-ADN2850SDZ Evaluation Board Software Main Window

Page 7: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 7 of 16

SOFTWARE OPERATION The main window of the EVAL-ADN2850SDZ software is divided into the following sections: QUICK COMMANDS, REGISTER ACCESS, HARDWARE PINS, TOLERANCE, and MEMORY. The features of the main window are as follows:

• The QUICK COMMANDS section allows you to send the ADN2850 quick commands directly to the ADN2850.

• The REGISTER ACCESS section can be used to update the RDAC registers by typing a value into a window and clicking WRITE. Alternatively, you can send a customized SPI data word by manually switching the scroll bars from 0 to 1 or from 1 to 0, as desired, and then clicking SEND DATA. When WRITE is clicked or a quick command is executed, a write-read operation is performed, and the values displayed in this section are updated with the actual

RDAC register values. This function can be used to verify whether the write operation was completed successfully. The scroll bars are updated upon each write transfer.

• The HARDWARE PINS section selects the level of the external control pins, switches the level of the WP pin, and generates a pulse in the PR pin.

• The TOLERANCE section displays the stored tolerance of the RDAC1 internal resistor.

• The MEMORY section displays the data stored in the memory block. The data can be updated by switching the scroll bar from READ to WRITE, updating a particular window value, clicking UPDATE ALL or UPDATE SINGLE, and selecting the memory location to write.

• Clicking EXIT closes the program but does not reset the part.

Page 8: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 8 of 16

EVALUATION BOARD SCHEMATICS AND ARTWORK

09842-009

MU

LTIC

HA

NN

EL

I2C

SPI

U/D

0x5E0x

5E0x

58

0x5A

1A

GN

D2

2B

2

3A

2

7A

4

8W

4

9D

GN

D

10SH

DN

11SY

NC

12D

IN

5A

GN

D4

6B

4

4W

2

21A

GN

D1

19A

3

13SD

O

14SC

LK

15R

ESE

T

16V

DD

17A

GN

D3

18W

3

24B

1

22W

1

23A

1

20B

3

U6

AD

8403

1W

1

2B

1

3A

1

7B

2

8A

29

SDA

10V

SS

11A

3

12B

35

WP

6W

2

4A

D0

19W

4

13W

3

14SC

L

15D

GN

D

16A

D1

17A

4

18B

4

20V

DD

U7

AD

5254

1N

C

2N

C

3G

ND

7SH

DN

8D

IN

9SC

LK

10SD

O

11V

SS

12N

C

5R

ESE

T

6V

DD

4SY

NC

21B

2

19A

2

13B

3

14W

3

15A

3

16B

1

17W

1

18A

1

24B

4

22A

4

23W

4

20W

2

U8

AD

5204

4G

ND

5V

DD

6SC

L8

A2

7SD

A1

B1

2A

1

3W

2

9B

2

10W

1

U1

AD

5243

4G

ND

5V

DD

6SC

LK

8SY

NC

7D

IN1

B1

2A

1

3W

2

9B

2

10W

1

U2

AD

5162

4G

ND

5V

DD

6SC

L8

A2

7SD

A1

B1

2A

1

3W

2

9B

2

10W

1

U3

AD

5172

_SO

CK

ET

1O

1

2SC

LK

3D

IN

7A

1

8W

1

9B

1

10A

2

11W

2

12B

2

5G

ND

6V

SS

4SD

O

19V

DD

13B

3

14W

3

15A

3

16B

4

17W

4

18A

420

WP

21R

ESE

T

22SY

NC

23R

DY

24O

2

U4

AD

5233

4V

SS

5W

2

6A

2

8G

ND

7B

2

1B

1

2A

1

3W

1

9M

OD

E

10D

AC

SEL

11U

/D

12C

LK

13C

S

14V

DD

U5

AD

5222

4W

1

5B

1

6A

1

8V

SS

7SD

A

1V

DD

2A

D0

3W

P

9SC

L

10D

GN

D

11A

D1

12A

3

13B

3

14W

3

U9

AD

5252

4G

ND

5V

SS

6A

1

8B

1

7W

1

1SC

LK

2D

IN

3SD

O

9B

2

10W

2

11A

2

12V

DD

13W

P14

RE

SET

15SY

NC

16R

DY

U10

AD

5232

4G

ND

5V

SS

6A

1

8B

1

7W

1

1SC

LK

2D

IN

3SD

O

9B

2

10W

2

11A

2

12V

DD

13W

P14

RE

SET

15SY

NC

16R

DY

U11

AD

5235

4G

ND

5V

SS

6V

1

8B

1

7W

1

1SC

LK

2D

IN

3SD

O

9B

2

10W

2

11V

2

12V

DD

13W

P14

RE

SET

15SY

NC

16R

DY

U12

AD

N28

50

A1

W1-

1 B1

A2

W2-

1 B2

A3

W3-

1 B3

A4

W4-

1 B4

SHD

N

RE

SET

SCLK

SDO

DIN

SYN

C-1

A1

W1-

8 B1

A2

W2-

8 B2

A3

W3-

8 B3

A4

W4-

8 B4

SDA

SCL

WP

A1

W1-

5 B1

A2

W2-

5 B2

RD

YSD

OD

INSC

LKSY

NC

-5

WP

RES

ET

VD

D

VD

D

VSS

VSS

VD

D

A1

W1-

4 B1

W2-

4 B2

SYN

C-4

DIN

SCLK

VD

D

A1

W1-

2 B1

A2

W2-

2 B2

A3

W3-

2 B3

A4

W4-

2 B4

SYN

C-2

SCLK

DIN

SDO

RE

SET

SHD

N

VD

D

VSS

A1

W1-

3 B1

A2

W2-

3 B2

A3

W3-

3 B3

A4

W4-

3 B4

O1

O2

RD

Y

SDO

SCLK

DIN

SYN

C-3

RE

SET

WP

VD

D VSS

W1-

6 B1

W2-

6 B2

V1

V2

RD

YSD

OD

INSC

LKSY

NC

-6

WP

RES

ET

VD

D VSS

A1

W1-

9 B1

A2

W2-

9 B2

A1

W1-

7 B1

A2

W2-

7 B2

RD

YSD

OD

INSC

LKSY

NC

-7

WP

RES

ET

VD

D

VSS

VD

D

SCL

SDA

WP

VSS

VD

D

A1

W1-

10 B1

A2

W2-

10 B2

SDA

SCL

A1

W1-

11 B1

A2

W2-

11 B2

SDA

SCL

VD

D

VD

D

A1

W1-

12 B1

A2

W2-

12 B2

CS

CLK

U/D

DA

CSE

LM

OD

E

VD

D

VSS

Figure 11. Schematic of Multiboard Digital Potentiometers

Page 9: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 9 of 16

VDD

DAC + FLOATING DAC + BW

PSEUDOLOG ATTENUATOR

B1

AC

AD8403-1

AD5204-1

AD5233-1

AD5162-1

AD5232-1

ADN2850-1

AD5235-1

AD5254-1

AD5252-1

AD5172

AD5243-1

W1

AD5222-1

+

-1

2

3U14-A

AD8618ARZ

BUF-W1 W1_BUF

R34

R35

R39

R40

AC_INPUT C3

A1

B1

R36

ABC

A20

ABC

A21

R3

R4

3 +2 -

1

U15-A

AD8652AR

5 +

6 - 7

U15-B

AD8652AR

8V+

4V-U15-C

W1-1

W1-2

W1-3

W1-4

W1-5

W1-6

W1-7

W1-8

W1-9

W1-10

W1-11

W1

W1-12

VDD

VSS

A1

B1

VSS

VDD

VSS

VDD

VSS

0984

2-01

0

AC + DC

Figure 12. Schematic of Multiboard RDAC1 Circuits

09

842-

011

INVERTING AND NON-INVERTING WITH LINEAR AND PSEUDO-LOG GAIN

DIGIPOT

PSEUDOLOG

LINEARNON-INVERTING

INVERTING

NON-INVERTING

INVERTING

CIRCUIT CONNECTION

VIN

GND

+

-

76

5U14-B

AD8618ARZ

AD8403 -2

AD5204 -2

AD5233 -2

AD5162 -2

AD5232 -2

ADN2850 -2

AD5235 -2

AD5254 -2

AD5252 -2

AD5172 -2

AD5243 -2

AD5322 -2

W2

VOUT

R38

J2-1

J2-2

R41

R42

R43

B2A2

OAV

OU

T

C1

BA A29

BAA27

BA A30

W2-1

W2-2

W2-3

W2-4

W2-5

W2-6

W2-7

W2-8

W2-9

W2-10

W2-11

W2-12

W2

A2

B2W2

Figure 13. Schematic of Multiboard RDAC2 Circuits

Page 10: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 10 of 16

09842-012

POW

ER-S

UPP

LIES

EXT

VD

D +5V

+3.3

V

GN

D

EXT

VSS

GN

D

CH

ANN

ELS

3 AN

D 4

POW

ER-S

UPP

LY

DIG

ITAL

PIN

SC

UR

REN

T M

ON

ITO

R+C

2410

uFC

250.

1uF C26

0.1u

F+

C27

10uF

J1-1

J1-2

J1-3

A B C

A25

A BA24

+ -14

1312U

14-D AD

8618

ARZ

AD84

03-4

AD52

04-4

AD52

33-4

AD52

54-4

+ -8

910U

14-C AD

8618

ARZ

AD84

03-3

AD52

04-3

AD52

33-3

AD52

54-3

BUF-

4

BUF-

3

A4

VOU

T4

B4 A3

VOU

T3

B3

W4

W3

O2

O1

V2V1

C2

0.1u

F C4

0.1u

F

VSS

VDD

+3.3

V+5

V

W4-

1

W4-

2

W4-

3

W4-

8

W3-

1

W3-

2

W3-

3

W3-

8

B4 A3

B3A4

O1

O2

V1

V2

Figure 14. Schematic of ADN2850 Power Supplies and Other Channels

Page 11: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 11 of 16

09842-013

MU

X-

CS

LEV

EL

TR

AN

SLA

TO

R

TE

ST

PO

INT

S

SD

PB

OA

RD

CO

NN

EC

TO

RA

ND

EE

PR

OM

EX

TE

RN

AL

CO

NT

RO

LC

ON

NE

CT

ION

SPO

RT

UA

RT

SPI

TIM

ER

S

INP

UT/

OU

TPU

T

GE

NER

AL

CO

NTR

OL

BLA

CK

FIN

PO

RT

PA

RA

LLE

L

FUTU

RE

USEI2C

PO

WE

RSU

PP

LY

1V

IN_4

-12V

2N

/C3

GN

D4

GN

D5

5V_U

SB6

GN

D

7P

AR

_D23

8P

AR

_D21

9P

AR

_D19

10P

AR

_D17

11G

ND

12P

AR

_D14

13P

AR

_D13

14P

AR

_D11

15P

AR

_D9

16P

AR

_D7

17G

ND

18P

AR

_D5

19P

AR

_D3

20P

AR

_D1

21P

AR

_RD

22P

AR

_CS

23G

ND

24P

AR

_A3

25P

AR

_A1

26P

AR

_FS3

27P

AR

_FS1

28G

ND

29SP

OR

T_D

R3

30SP

OR

T_D

R2

31SP

OR

T_D

R1

32SP

OR

T_D

T1

33SP

OR

T_D

T234

SPO

RT_

DT3

35SP

OR

T_IN

T

36G

ND

37SP

I_SE

L_B

38SP

I_SE

L_C

39SP

I_SE

L1/_

SS

40G

ND

41SD

A_1

42SC

L_1

43G

PIO

044

GP

IO2

45G

PIO

4

46G

ND

47G

PIO

6

48TM

R_A

49TM

R_C

50FU

TU

RE

51FU

TU

RE

52G

ND

53FU

TU

RE

54FU

TU

RE

55FU

TU

RE

56FU

TU

RE

57FU

TU

RE

58G

ND

59U

AR

T_R

X

60R

ESE

T_IN

61B

MO

DE

1

62U

AR

T_TX

63G

ND

64FU

TU

RE

65FU

TU

RE

66FU

TU

RE

67FU

TU

RE

68FU

TU

RE

69G

ND

70FU

TU

RE

71FU

TU

RE

72TM

R_D

73TM

R_B

74G

PIO

7

75G

ND

76G

PIO

5

77G

PIO

3

78G

PIO

1

79SC

L_0-

EEP

RO

M

80SD

A_0

-EEP

RO

M

81G

ND

82SP

I_C

LK

83SP

I_M

ISO

84SP

I_M

OSI

85SP

I_SE

L_A

86G

ND

87SP

OR

T_TS

CLK

88SP

OR

T_D

TO

89SP

OR

T_TF

S90

SPO

RT_

RFS

91SP

OR

T_D

R0

92SP

OR

T_R

SCLK

93G

ND

94P

AR

_CLK

95P

AR

_FS2

96P

AR

_A0

97P

AR

_A2

98G

ND

99P

AR

_IN

T

100

PA

R_W

R

101

PA

R_D

0

102

PA

R_D

2

103

PA

R_D

4

104

GN

D

105

PA

R_D

6

106

PA

R_D

8

107

PA

R_D

10

108

PA

R_D

12

109

GN

D

110

PA

R_D

15

111

PA

R_D

16

112

PA

R_D

18

113

PA

R_D

20

114

PA

R_D

22

115

GN

D

116

V_I

O(3

.3V

)

117

GN

D

118

GN

D

119

7V_U

NR

EG

OU

T

120

7V_U

NR

EG

OU

T

J22

BLA

CK

FIN

-DB

_FEM

ALE

_CO

NN

ECTO

R_2

1A

02

A1

3A

24

VSS

5SD

A

6SC

L

7W

P

8V

CCU25

24LC

01

D6 LED

R37 1K

DG

ND

AG

ND

4S8

5S6

11A

010

A1

6E

N

9A

2

1S5

14S2

2S7

12S4

13S1

3D

7V

SS

8G

ND

15S3

16V

DD

A22

AD

G65

8

35A

036

A1

37A

238

A3

39A

440

A5

1A

62

A7

3A

84

A9

5A

106

A11

7A

128

A13

9A

1410

A15

30B

029

B1

28B

227

B3

26B

425

B5

24B

623

B7

22B

821

B9

20B

1019

B11

18B

1217

B13

16B

1415

B15

32B

E2

31B

E1

34SE

L

11G

ND

33V

CC

U13

AD

G32

47-C

SP

MU

X-A

0|C

S

MU

X-A

2|U

/D

SCLK

_BF

DIN

_BF

MU

X-A

1|D

AC

SEL

RD

Y|M

OD

E

CLK

SDO

_BF

SYN

C_B

F

SDA

_BF

SHD

N_B

F

SCL_

BF

RE

SET_

BF

WP

_BF

+3V

3

VD

D

+5V V

SS

A23 A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A16

A17

A18

R2

2k2

R1

2k2

DIN

_BF

SDO

_BF

SCLK

_BF

SYN

C_B

F

RD

Y|M

OD

ER

ESE

T_B

FW

P_B

F

SDA

_BF

SCL_

BF SH

DN

_BF

+3.3

V+5

V

+3.3

V

MU

X-A

2|U

/DM

UX

-A1|

DA

CSE

LM

UX

-A0|

CS

MU

X-A

0|C

SM

UX

-A1|

DA

CSE

LM

UX

-A2|

U/D

SYN

C-1

SYN

C-2

SYN

C-3

SYN

C-4

SYN

C-5

SYN

C-6

SYN

C-7

VD

D

+3.3

V

CLK

_BF

SCLK

_BF

SCLK

DIN

_BF

DIN

SDO

_BF

SDO

SYN

C_B

FSY

NC

SYN

CR

ESE

T_B

FW

P_B

FSH

DN

_BF

RD

Y_B

F

RE

SET

WP

SHD

NR

DY

SDA

_BF

SCL_

BF

SDA

SCL

MU

X-A

0|C

SM

UX

-A1|

DA

CSE

LM

UX

-A2|

U/D

RD

Y|M

OD

E

CS

DA

CSE

LU

/DM

OD

EC

LK_B

FC

LK

+5V

MU

X-A

0|C

S

MU

X-A

1|D

AC

SEL

MU

X-A

2|U

/D

RD

Y|M

OD

E

CLK

_BF

SCLK

_BF

DIN

_BF

SDO

_BF

SYN

C_B

F

SDA

_BF

SCL_

BF

SHD

N_B

F

RE

SET_

BF

WP

_BF

VD

DV

SS

+5V

+3.3

V

+3.3

V

Figure 15. Schematic of SDP Connector

Page 12: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 12 of 16

0984

2-01

4

Figure 16. Component Side View

0984

2-01

5

Figure 17. Component Placement Drawing

0984

2-01

6

Figure 18. Layer 2 Side PCB Drawing

Page 13: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 13 of 16

0984

2-01

7

Figure 19. Layer 3 Side PCB Drawing

0984

2-01

8

Figure 20. Solder Side PCB Drawing

Page 14: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 14 of 16

ORDERING INFORMATION BILL OF MATERIALS

Table 7. Qty Reference Designator Description Supplier1

1

/Part Number C1 10 nF capacitor, 0805 FEC 1692285

4 C2, C4, C25, C26 0.1 µF capacitor, 0603 FEC 138-2224 1 C3 1 µF capacitor, 0402 FEC 1288253 2 C24, C27 10 µF capacitor, 1206 FEC 1611967 1 D6 LED, green FEC 579-0852 1 J1 3-pin connector FEC 151790 1 J2 2-pin connector FEC 151789 1 J22 Receptacle, 0.6 mm, 120 way Digi-Key H1219-ND 4 A20, A21, A24, A25 Header, 2-row, 36 + 36 way, and jumper socket, black FEC 148-535 and FEC 150-410 3 A27, A29, A30 Header, 1-row, 3-way, and jumper socket, black FEC 102-2248 and FEC 150-410 4 BUF-W1, OAVOUT, BUF-3, BUF-4 Header, 1-row, 2-way, and jumper socket, black FEC 102-2247 and FEC 150-410 1 R41 1.78 kΩ resistor, 0603, 1% FEC 1170811 2 R1, R2 2.2 kΩ resistor, 0603, 1% FEC 933-0810 5 R3, R4, R38, R39, R40 2.7 kΩ resistor, 1206, 1% FEC 9337288 1 R34 4.7 kΩ resistor, 0603, 1% FEC 9331247 35 AD5162-1, AD5162-2, AD5172-1,

AD5172-2, AD5204-1, AD5204-2, AD5204-3, AD5204-4, AD5222-1, AD5222-2, AD5232-1, AD5232-2, AD5233-1, AD5233-2, AD5233-3, AD5233-4, ADN2850-1, ADN2850-2, AD5243-1, AD5243-2, AD5252-1, AD5252-2, ADN2850-1, ADN2850-2, ADN2850-3, ADN2850-4, AD8403-1, AD8403-2, AD8403-3, AD8403-4, ADN2850-1, ADN2850-2, R35, R42, R43

0 Ω resistor, 0603 FEC 9331662

1 R37 1 kΩ resistor, 0603, 1% FEC 933-0380 6 3.3 V, 5 V, DGND, AGND, VDD, VSS Test point, PCB, black, PK100 FEC 873-1128 35 A1, A2, A3, A4, RDY|MODE, RESET_BF,

SCL_BF, SCLK_BF, SDA_BF, SDO_BF, SHDN_BF, SYNC_BF, MUX-A0|CS, MUX-A1|DACSEL, MUX-A2|U/D, O1, O2, DIN_BF, CLK, B1, B2, B3, B4, V1, V2, VOUT, VOUT2, VOUT3, VOUT4, W1, W1_BUF, W2, W3, W4, WP_BUF

Test point, PCB, red, PK100 FEC 873-1144

1 U1 AD5243 Analog Devices AD5243 1 U2 AD5162 Analog Devices AD5162 1 U3 AD5172 Analog Devices AD5172 1 U4 AD5233 Analog Devices AD5233 1 U5 AD5222 Analog Devices AD5222 1 U6 AD8403 Analog Devices AD8403 1 U7 ADN2850 Analog Devices ADN2850 1 U8 AD5204 Analog Devices AD5204 1 U9 AD5252 Analog Devices AD5252 1 U10 AD5232 Analog Devices AD5232 1 U11 ADN2850 Analog Devices ADN2850 1 U12 ADN2850 Analog Devices ADN2850 1 U13 ADG3247 Analog Devices ADG3247 1 U14 AD8618 Analog Devices AD8618 1 U15 AD8652 Analog Devices AD8652 1 A22 ADG658 Analog Devices ADG658 1 U25 24LC64 FEC 975-8070 1 FEC refers to Farnell Electronic Component Distributors; Digi-Key refers to Digi-Key Corporation.

Page 15: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

Evaluation Board User Guide UG-276

Rev. 0 | Page 15 of 16

NOTES

Page 16: Evaluation Board for the ADN2850 Digital Rheostat · 2017. 2. 15. · Evaluation Board User Guide UG-276 OneTechnologyWay•P.O.Box9106•Norwood,MA 02062-9106,U.S.A.•Tel:781.329.4700•Fax:781.461.3113•

UG-276 Evaluation Board User Guide

Rev. 0 | Page 16 of 16

NOTES

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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