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Evaluation Board User Guide

UG-473

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

Evaluating the AD5141 Digital Potentiometer

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 20

FEATURES

Full featured evaluation board in conjunction with low

voltage digiPOT motherboard (EVAL-MB-LV-SDZ)

Various test circuits

Various ac/dc input signals

PC control via a separately purchased system demonstration

platform (SDP-B or SDP-S)

PC software for control

PACKAGE CONTENTS

EVAL-AD5141DBZ board

EVAL-MB-LV-SDZ motherboard

CD that includes

Self-installing software that allows users to control the

board and exercise all functions of the device

Electronic version of the AD5141 data sheet

Electronic version of the UG-473 user guide

GENERAL DESCRIPTION

This user guide describes the evaluation board for evaluating the

AD5141—a quad-channel, 256-position, nonvolatile memory,

digital potentiometer. With versatile programmability, the AD5141

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 AD5141 supports a dual-supply ±2.25 V to ±2.75 V operation

and a single-supply 2.3 V to 5.5 V operation, making the device

suitable for battery-powered applications and many other appli-

cations. In addition, the AD5141 can be configured as a versatile

C or SPI serial interface. The EVA L -AD5141DBZ can operate

in single-supply or dual-supply mode and incorporates an internal

power supply from the USB.

Complete specifications for the AD5141 part can be found in the

AD5141 data sheet, which is available from Analog Devices, Inc.,

and should be consulted in conjunction with this user guide

when using the evaluation board.

EVAL-AD5141DBZ WITH MOTHERBOARD AND SDP-S

11010-001

Figure 1. Digital Picture of Evaluation Board with Low Voltage DigiPOT Motherboard and System Demonstration Platform

Summary of content (20 pages)

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Evaluation Board User Guide UG-473 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
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UG-473 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Software ...............................................................8 Package Contents .............................................................................. 1 Installing the Software ..................................................................8 General Description ..............................................
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Evaluation Board User Guide UG-473 EVALUATION BOARD HARDWARE Link Options POWER SUPPLIES The EVAL-MB-LV-SDZ motherboard supports using single and dual power supplies. The EVAL-AD5141DBZ evaluation board can be powered either from the SDP port or externally by the J1 and J2 connectors, 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.
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UG-473 Evaluation Board User Guide DIGITAL INTERFACE The output voltage is defined in Equation 1. The EVAL-AD5141DBZ can be configured as an I2C or SPI digital interface, depending on the position in the A2 jumper (see Table 4). VOUT = (VA − VB ) × (1) where: RDAC1 is the code loaded in the RDAC1 register. VA is the voltage applied to the A terminal (A9 link). VB is the voltage applied to the B terminal (A10 link). Table 4.
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Evaluation Board User Guide UG-473 AC Signal Attenuation Table 9. AC Signal Attenuation Link Motherboard Links The RDAC can be used to attenuate an ac signal, which must be provided externally using the AC_INPUT connector, as shown in Figure 3. Voltage Supply Single Depending on the voltage supply rails and the dc offset voltage of the ac signal, various configurations can be used as described in Table 8 and Table 9.
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UG-473 Evaluation Board User Guide Signal Amplifier Note that the input signal, VIN, must be negative. The RDAC can be operated as an inverting or noninverting signal amplifier supporting linear or pseudologarithmic gains. Table 10 and Table 11 show the available configurations. G=− The noninverting amplifier with linear gain is shown in Figure 4, and the gain is defined in Equation 3. RWB R AW (5) where: RWB is the code loaded for the RWB resistance. RAW is the code loaded for the RAW resistance.
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Evaluation Board User Guide UG-473 Table 11. Amplifier Selection Motherboard Link Options Amplifier Noninverting Inverting Gain Linear Linear Setting Gain Mode Enabled Yes Pseudologarithmic No Linear Yes Pseudologarithmic No Rev.
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UG-473 Evaluation Board User Guide EVALUATION BOARD SOFTWARE INSTALLING THE SOFTWARE The EVAL-AD5141DBZ kit includes a CD containing the evaluation board software. The software is compatible with Windows® XP, Windows Vista, and Windows 7 (both 32 bits and 64 bits). 2. 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. Start > Control Panel > Add or Remove Programs > AD5141 Eval Board.
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UG-473 11010-020 Evaluation Board User Guide Figure 9. EVAL-AD5141DBZ Software Main Window Rev.
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UG-473 Evaluation Board User Guide SOFTWARE OPERATION The main window of the EVAL-AD5141DBZ software has two tabs, Visual Mode and Manual Control. Visual Mode The Visual Mode tab is divided into the following sections: ALL CHANNELS COMMANDS, INDIVIDUAL CHANNEL COMMANDS, and a block diagram that contains boxes for changing the control register values and buttons and for controlling the hardware pins. value in its respective block within the diagram.
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Evaluation Board User Guide UG-473 EVALUATION BOARD SCHEMATICS AND ARTWORK 11010-010 MOTHERBOARD Figure 11. SDP Connector and Power Supply Rev.
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UG-473 Evaluation Board User Guide 11010-011 Figure 12. Schematic of Test Circuits Rev.
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UG-473 11010-012 Evaluation Board User Guide Figure 13. Schematic of Connectors to Daughter Board Rev.
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Evaluation Board User Guide 11010-013 UG-473 11010-014 Figure 14. Component Side View of Motherboard 11010-015 Figure 15. Component Placement Drawing of Motherboard Figure 16. Layer 2 Side PCB Drawing of Motherboard Rev.
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C4 VLOGIC VSS C1 LRDAC INDEP SCL|SCLK SDA|DIN ADDR1|SDO ADDR0|SYNC 10uF 0.1uF + C2 10uF 0.
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Evaluation Board User Guide 11010-017 UG-473 11010-018 Figure 18. Component Side View of Daughter Board Figure 19. Component Placement Drawing of Daughter Board Rev.
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UG-473 11010-019 Evaluation Board User Guide Figure 20. Layer 2 Side PCB Drawing of Daughter Board Rev.
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UG-473 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 12.
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Evaluation Board User Guide UG-473 Table 13. Daughter Board Qty 1 1 1 7 2 2 1 1 2 1 Reference Designator U1 U2 A1 A2, A3, A4, A5, A6, A7, A8 C2, C3 C1, C4 J1 J2 J3, J4 Description 256-position digital potentiometer Low voltage quad SPDT switch 2-pin SIL header and shorting link 3-pin SIL header and shorting link 6.3 V tantalum capacitor (Case A), 10 µF, ±20% 50 V, X7R ceramic capacitor, 0.1 µF, ±10% Header, 2.54 mm, PCB, 1 × 8-way 12-pin (2 × 6), 0.
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UG-473 Evaluation Board User Guide NOTES I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). 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.