Datasheet

ManualsBrandsANALOG DEVICES ManualsDev KitsPCB design board

Evaluation Board User Guide

UG-442

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

Evaluating the AD5422 Single Channel, 16-Bit, Current Source and Voltage Output

DAC, HART Connectivity

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. C | Page 1 of 16

FEATURES

Full-featured evaluation board for the AD5422

On-board reference

Link options

Direct hook-up to USB port of PC

PC software for control

EVALUATION BOARD DESCRIPTION

The EVAL-AD5422 is a full-featured evaluation board that is

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

16-bit AD5422 current source and voltage output digital-to-

analog converter (DAC). All of the AD5422 pins are accessible

at on-board connectors for external connection. The board can

be controlled by two means, via the on-board connector (J8) or via

the USB port of a Windows® 2000-, NT®-, XP®-based PC using the

AD5422 evaluation software. The default setup is for control via

the USB port.

Two separate packages exist for the AD5422 (24-lead TSSOP and

40-lead LFCSP); therefore, two corresponding evaluation boards

are available.

DEVICE DESCRIPTION

The AD5422 is a low cost, precision, fully integrated 16-bit

converter, offering a programmable current source and

programmable voltage output designed to meet the requirements

of industrial process control applications. The output current

range is programmable to 4 mA to 20 mA, 0 mA to 20 mA, or an

overrange function of 0 mA to 24 mA. The voltage output is

provided from a separate pin that can be configured to provide

0 V to 5 V, 0 V to 10 V, ±5 V or ±10 V output ranges; an overrange

of 10% is available for all ranges. Analog outputs are short- and

open-circuit protected and can drive capacitive loads of 1 μF. The

device is specified to operate with a power supply range from

10.8 V to 40 V. The output loop compliance is 0 V to AV

− 2.5 V.

Complete specifications for the AD5422 are available in the

AD5422 data sheet and should be consulted in conjunction

with this document when using the evaluation board.

FUNCTIONAL BLOCK DIAGRAM

USB

CONNECTOR

POWER SUPPLY INPUTS

HEADER (J8)

CONTROLLER

CY7C68013A

SELECT

ADC

REFIN

INPUT/

OUTPUT

REFOUT

AD5422

VOLTAGE

REFERENCE

EXT REF

ITO V

OUT

08230-001

Figure 1.

Summary of content (16 pages)

PAGE 1
Evaluation Board User Guide UG-442 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
PAGE 2
UG-442 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Link Options ..................................................................................3 Evaluation Board Description......................................................... 1 Evaluation Board Software ...............................................................6 Device Description ....................................................
PAGE 3
Evaluation Board User Guide UG-442 EVALUATION BOARD HARDWARE POWER SUPPLIES Default Link Option Setup The following external supplies must be provided: • • • • • 5 V between the 5 V and 0 V inputs for the digital supply of the AD5422 and digital circuitry. Alternatively, place LK6 in Position A to power the digital circuitry from the USB port (default). 10.8 V to 40 V between the AVDD and GND inputs for the analog supply of the AD5422. 0 V to −26.
PAGE 4
UG-442 Evaluation Board User Guide Table 4. Link Options Link No. LK1 LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9 LK10 LK11 LK12 LK13 LK14 Description This link selects the state of the CLEAR SELECT pin (when the evaluation board is configured for external control). Position A ties the CLEAR SELECT pin to 0 V. Position B ties the CLEAR SELECT pin to DVCC. This link selects the state of the CLEAR pin (when the evaluation board is configured for external control). Position A ties the CLEAR pin to 0 V.
PAGE 5
Evaluation Board User Guide Link No. LK15 LK16 LK17 LK18 UG-442 Description This link selects the voltage reference source. Position A selects the internal voltage reference of the AD5422 as the voltage reference source. Position B selects an external source that can be applied at Connector J3. Position C selects the on-board ADR435 as the voltage reference source. This link selects the negative power supply source for U6.
PAGE 6
UG-442 Evaluation Board User Guide EVALUATION BOARD SOFTWARE SOFTWARE OPERATION The AD5422 evaluation kit includes self-installing software on a CD. The software is compatible with Windows 2000/NT/XP. If the setup file does not run automatically, run the setup.exe file from the CD. To launch the software, complete the following steps: 1. From the Start menu, select Analog Devices – AD5422/ AD5422 Evaluation Software. The main window of the software then displays (see Figure 3).
PAGE 7
Evaluation Board User Guide UG-442 The main window is divided into eight sections: Input Register, Status Register, Control Register, Reset Register, Clear/Clear Select Pins, Read/Write Registers, Measure Output Voltage/ Current, and Program Voltage/Current. Reset Register Input Register Clear Pin The Input Register section displays the contents of the input register. The 24-bit display is updated each time a read or a write operation is requested via the main window controls.
PAGE 8
DGND DVCC PGND SHIELD J7-2 C55 PA2 PA3 PA5 PA6 PA7 FD8 FD7 LK1 LK2 PGND DVCC DVCC DGND DVCC 10µF + C56 USB_POWER J1 USB-MINI-B 1 VBUS 2 D– 3 D+ 4 IO 5 GND 0.1µF B A VDD S1A S2A S3A S4A DGND 2 5 11 14 16 U8 D1 R23 1kΩ 5V PGND RED 1 15 4 7 9 12 ADG774 DGND 8 D1 D2 D3 D4 IN EN GND + U7 2 5 11 14 16 0.1µF 10µF DVCC 20% C19 VDD PGND ADP3303-3.
PAGE 9
V+ B 0Ω 0Ω 0Ω 0Ω 0Ω 0Ω R8 R9 R6 R5 R10 R4 1 2 14 12 11 10µF DVCC 0.1µF CS DIN SCLK DOUT DGND VDRIVE U6 C35 C36 DGND 20% LK16 B C45 DGND 10kΩ R14 10kΩ R3 DVCC C43 A C46 C44 VIN1 AD7321 VIN0 0.1µF 10µF 10µF 0.1µF 8 7 5 2 B 15 C 24 VIN0 4 12 U1 6 11 C49 C48 R13 39kΩ + AD820 – 4 V– 7 V+ C10 0.1µF 1 2 3 U9 R1 15kΩ R27 20% 0.1µF 10µF C8 + C9 LK18 SOCKETED 4nF C1 AVSS 13 19 20 23 21 22 18 17 R12 5.6kΩ 0.
PAGE 10
DVCC 0.1µF C55 LK1 PA2 PA3 PA5 PA6 PA7 FD8 FD7 DGND PGND IO 5 4 LK2 DVCC DVCC DGND DVCC GND 10µF + C56 U8 VDD 2 5 S1A S2A 11 14 S3A S4A 16 PGND USB_POWER J1 USB-MINI-B 1 VBUS 2 DSHIELD SHIELD 3 D+ J7-2 0V B A LK6 DGND D1 R23 1kΩ 5V D1 D2 D3 D4 4 7 9 12 DGND C28 0.1µF R16 100kΩ C20 R19 10kΩ PGND 3.3V 1 2 6 3 DGND C30 PGND PGND PGND SDIN SCLK LATCH LK8 3.
PAGE 11
VDRIVE 0.1µF DGND 1 2 CS 14 DIN 12 SCLK DOUT 11 U6 C35 C36 10µF DVCC LK16 B C45 C43 A C46 C44 VIN1 AD7321 VIN0 8 10µF 0.1µF 7 0.1µF 10µF V– AVSS 17 J3 18 B 36 IOUT BOOST -VSENSE VOUT +VSENSE CCOMP2 CCOMP1 CAP2 CAP1 VIN0 3 6 15 13 12 C49 37 V+ C48 R13 39kΩ + AD820 – 4 V– 7 C10 0.1µF 14 10µF C11 RSET GNDGNDGNDGND AVSS AVSS LATCH SCLK SDIN SDO CLEAR_SELECT CLEAR FAULT U1 AD5422 DVCC_SELECT DVCC REFOUT REFIN AVDD 39 6 REFIN 10µF C47 20% + C50 0.
PAGE 12
Evaluation Board User Guide 08230-008 UG-442 08230-009 Figure 9. AD5422 TSSOP Evaluation Board Component Placement 08230-010 Figure 10. AD5422 TSSOP Evaluation Board Solder Side PCB Figure 11. AD5422 TSSOP Evaluation Board Component Side PCB Rev.
PAGE 13
UG-442 08230-011 Evaluation Board User Guide 08230-012 Figure 12. AD5422 LFCSP Evaluation Board Component Placement 08230-013 Figure 13. AD5422 LFCSP Evaluation Board Solder Side PCB Figure 14. AD5422 LFCSP Evaluation Board Component Side PCB Rev.
PAGE 14
UG-442 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 5.
PAGE 15
Evaluation Board User Guide UG-442 NOTES Rev.
PAGE 16
UG-442 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.