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Evaluation Board User Guide

UG-244

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 a Quad-Channel, 16-Bit, Serial Input, 4 mA to 20 mA,

Voltage Output DAC with Dynamic Power Control and HART Connectivity

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. B | Page 1 of 16

FEATURES

Full-featured evaluation board for the AD5755, AD5755-1,

AD5757, and

Link options

PC control in conjunction with Analog Devices, Inc., system

demonstration platform (SDP)

PC software for control

GENERAL DESCRIPTION

The EVAL-AD575xSDZ is a full-featured evaluation board that

is designed to allow the user to easily evaluate all features of the

AD5755, AD5755-1, or AD5757, quad channel, 16-bit current

source and voltage output DAC with dynamic power control

and HART connectivity. The board can be controlled by two

means: via the on-board connector (J11) or via the SDP

connector (J9). The SDP board allows the evaluation board to

be controlled through the USB port of a Windows® XP® (SP2 or

later) or Windows Vista® (32-bit or 64-bit) or Windows 7 (32-bt

or 64-bit) based PC using the E VA L -AD575xSDZ evaluation

software.

DEVICE DESCRIPTION

The AD5755 is a quad, voltage and current output DAC that

operates with a power supply range from −26.4 V to +33 V.

On-chip dynamic power control minimizes package power

dissipation in current mode. This is achieved by regulating

the voltage on the output driver from 7.4 V to 29.5 V.

The part uses a versatile 3-wire serial interface that operates at

clock rates up to 30 MHz and is compatible with standard SPI,

QSPI™, MICROWIRE™, DSP, and microcontroller interface

standards. The interface also features optional CRC-8 packet

error checking, as well as a watchdog timer that monitors

activity on the interface.

The AD5757 is a current output-only version of the AD5755

and is HART compatible. The AD5755-1 is identical to the

AD5755 except the –V

SENSE_x

functionality has been removed

and, instead, the device is HART compatible. For both the

AD5757 and AD5755-1, each channel has a corresponding

CHART pin so that HART signals can be coupled onto the

current output.

EVALUATION BOARD CONNECTION DIAGRAM

CHANNEL B

CHANNEL A

REFOUT

REFIN

CHANNEL D

AGND

OUT_C

–V

SENSE_C

OUT_C

SENSE_C

AGND

OUT_D

–V

SENSE_D

OUT_D

SENSE_D

AGND

OUT_A

–V

SENSE_A

OUT_A

SENSE_A

AGND

OUT_B

–V

SENSE_B

OUT_B

SENSE_B

CHANNEL C

AD5755

POWER SUPPLY INPUTS

VOLTAGE

REFERENCE

EXT REF

USB

PORT

SYSTEM DEMONSTRATION

PLATFORM

BOARD

PIN HEADER (J11)

PER-CHANNEL

DC-DC

CIRCUITRY

09633-001

Figure 1.

Summary of content (16 pages)

PAGE 1
Evaluation Board User Guide UG-244 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 a Quad-Channel, 16-Bit, Serial Input, 4 mA to 20 mA, Voltage Output DAC with Dynamic Power Control and HART Connectivity FEATURES DEVICE DESCRIPTION Full-featured evaluation board for the AD5755, AD5755-1, AD5757, and Link options PC control in conjunction with Analog Devices, Inc.
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UG-244 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Changing and Reprogramming the Range ................................6 General Description ......................................................................... 1 Clear Command ............................................................................6 Device Description .....................................................................
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Evaluation Board User Guide UG-244 EVALUATION BOARD HARDWARE POWER SUPPLIES The following power supplies are required. Table 1. Power Supply Connections Connector AVDD AVSS AVCC Nominal 15 V −15 V/ +0 V 5V DVDD 3.3 V REFIN 5V Comment Positive analog supply voltage. 10.8 V to 33 V range. (Green LED D2 lights up when power is supplied to AVDD.) Negative analog supply voltage. +10.8 V to −26.4 V range, or 0 V for the AD5757 or AD5755-1 in unipolar supply mode. DC-to-dc supply voltage. 4.5 V to 5.
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UG-244 Evaluation Board User Guide Connector J11 Pin Descriptions Table 7. On-Board Connectors for AD5755-1 6 8 10 12 1 3 5 7 9 11 Connector GND A1, B1, C1, D1 Figure 2. Connector J11 Pin Configuration Function There is a per-channel connection to AGND. IOUT output for Channel A, Channel B, Channel C, and Channel D, respectively. CHART input for Channel A, Channel B, Channel C, and Channel D, respectively.
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Evaluation Board User Guide UG-244 EVALUATION BOARD SOFTWARE SOFTWARE INSTALLATION The EVAL-AD575xSDZ evaluation kit includes self-installing software on a CD. The software is compatible with Windows XP (SP2) and Windows Vista (32-bit or 64-bit), and Windows 7 (32-bit or 64-bit). If the setup file does not run automatically, you can run setup.exe from the CD. AD5755-1 Evaluation Software. The main window of the software opens (see Figure 5). 2.
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UG-244 Evaluation Board User Guide CHANGING AND REPROGRAMMING THE RANGE 09633-005 SELECTING THE DEVICE Figure 6. Device Selection In the top left corner of the main window, select the main device on the board, either AD5755, AD5755-1, orAD5757, from the drop-down list (see Figure 6) to adjust the available controls accordingly. When changing between ranges, the same sequence as described in the Enabling the Output Correctly section should be used.
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Evaluation Board User Guide UG-244 CONTROL OF DIGITAL PINS WRITING TO THE DAC CONTROL REGISTERS The RESET, LDAC, POC, and ALERT pins can all be controlled by clicking the relevant boxes shown in Figure 9. The FAULT and ALERT boxes display the status of the ALERT and FAULT pins. The FAULT and ALERT pins of the device are polled by the evaluation software every ~100 ms. The FAULT pin is also connected to the reference LED, D1, on the evaluations board, and ALERT is connected to the orange LED, D14.
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UG-244 Evaluation Board User Guide WRITING TO THE DC-TO-DC CONTROL REGISTER WRITING TO THE SLEW RATE CONTROL REGISTER This function allows you to write to and configure the dc-to-dc control register. Select the required clamp voltage, switching frequency, and phase from the pull-down menu and click WRITE to write the selected data to the device. On the evaluation board, the dc-to-dc converter perform best at a 410 kHz switching frequency (see the DC-to-DC Boost section).
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Evaluation Board User Guide UG-244 SOFTWARE REGISTER PEC Click the Software Register tab shown in Figure 15 to access this feature. From this tab, you can set the user toggle bit that is contained in the status register and perform a software reset. Click the PEC tab shown in Figure 15 to access this feature. Click the Use PEC button to enable the automatic PEC feature of the device: an 8-bit PEC code is appended to the end of every write sequence and is read at the end of every read sequence.
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UG-244 Evaluation Board User Guide 09633-015 EVALUATION BOARD SCHEMATICS AND ARTWORK 09633-016 Figure 16. Main Device Circuitry Figure 17. DC-to-DC Circuitry Rev.
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Evaluation Board User Guide UG-244 GND AGND J3-5 GND J1-5 AGND GND A1 IOUTA J3-4 +VSENSEA J3-1 C1 IOUTA IOUTC J1-4 IOUTC +VSENSEC C2 J1-1 +VSENSEC VOUTC C3 J1-2 VOUTC –VSENSEC C4 J1-3 A2 +VSENSEA LK8 LK4 A3 VOUTA J3-2 –VSENSE A A4 J3-3 VOUTA CHARTA-AD5755-1 –VSENSEA-AD5755 LK5 J2-5 AGND GND J4-5 GND IOUTD D1 J4-4 IOUTD +VSENSED D2 J4-1 +VSENSED VOUTD D3 J4-2 VOUTD –VSENSED D4 J4-3 AGND GND B1 IOUTB J2-4 +VSENSEB J2-1 IOUTB B2 +VSENSEB LK10 LK6 B3 J2-2
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Evaluation Board User Guide 09633-019 UG-244 09633-020 Figure 20. SDP Board Connector Figure 21. Component Placement Rev.
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UG-244 09633-021 Evaluation Board User Guide 09633-022 Figure 22. Top PCB Layer Figure 23. Inner First PCB Layer Rev.
PAGE 14
Evaluation Board User Guide 09633-023 UG-244 09633-024 Figure 24. Inner Second PCB Layer Figure 25. Bottom PCB Layer Rev.
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Evaluation Board User Guide UG-244 ORDERING INFORMATION BILL OF MATERIALS Table 12. Qty 4 4 Reference Designator C1, C42, C48, C52 C2, C32, C33, C44 Part Description 10 µF, 10 V, SMD tantalum capacitor, Case A 4.7 µF, 50 V, X7R ceramic capacitor, 1210 Stock Code FEC 1135234 FEC 1404215 10 µF, 50 V, X5R ceramic capacitor, 1210 0.
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UG-244 Evaluation Board User Guide 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.