AD5750 Evaluation Board Documentation PDF

EVALUATION BOARD for AD5750,
Industrial Current/Voltage
Output Driver
Programmable Ranges
AD5750 EVALUATION BOARD
Preliminary Technical Data
programmable output ranges. The software ranges are
configured via an SPI/Microwire compatible serial interface.
FEATURES
Current Output Ranges: 4–20mA, 0–20mA,
0–24mA, ±20ma, ±24ma
Voltage Output Ranges: 0-5V, 0-10V, ±5V, ±10V,
20% over-range
Flexible Serial Digital Interface
On-Chip Output Fault Detection
Asynchronous CLEAR Function
Power Supply Range
AVDD : = +12V to +20V
AVSS : = -12V to -20V
Output Loop Compliance to AVDD – 2.0 V
Temperature Range: -40°C to +105°C
LFCSP Packages
The output current range is programmable across five current
ranges - 4–20mA, 0–20mA or 0–24mA, ±20ma and ±24ma.
Voltage output is provided from a separate pin that can be
configured to provide 0V to 5V, 0V to 10V, ±5V or ±10V
output ranges. An over-range of 20% is available on the voltage
ranges.
The input to the AD5750 is an analog input 0- 4.096v. Once the
range is selected 0v will output the low end of the selected range
and 4.096v will output the high end of the selected range. This
evaluation board is configured to allow the AD5750 to be
driven with an on-board DAC (AD5662 16 bit 0-4.096v
output). Alternatively, the user can configure an external 04.096v input. The Evaluation board is designed to operate the
AD5750 in software mode only.
APPLICATIONS
Process Control
Actuator Control
PLC
The evaluation board is powered via terminal blocks.
GENERAL DESCRIPTION
Note. The sense resistor used on this board (R38) is 15k ohm
<15ppm/oc. There is no load resistor provided on this board.
The AD5750 is a single channel, low-cost, precision,
voltage/current output driver with hardware or software
EVALUATION BOARD BLOCK DIAGRAM
Power Supply Inputs
V+
AVDD
EXT REF
4.096V
REF
AVSS
USB
CONNECTOR
CONTROLLER
CY7C68013
VDD REF
VIN
AD5662
REF
AD5750
VOUT
IOUT
Figure 1.
Rev. PrD
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
AD5750
Preliminary Technical Data
TABLE OF CONTENTS
Features .............................................................................................. 1
EVALUATION BOARD SOFTWARE ............................................5
Applications ....................................................................................... 1
SOFTWARE INSTALLATION....................................................5
General Description ......................................................................... 1
SOFTWARE OPERATION ..........................................................5
Evaluation Board Block Diagram ................................................... 1
Readback from the AD5750: .......................................................6
Table of Contents .............................................................................. 2
Resetting the AD5750: ..................................................................7
Revision History ........................................................................... 2
Testing the Outputs: ......................................................................7
OPERATING THE AD5750 EVALUATION BOARD ................ 3
Evaluation Board Schematics and Artwork ...................................8
POWER SUPPLIES ...................................................................... 3
Bill Of Materials .............................................................................. 10
LINK OPTIONS ........................................................................... 3
REVISION HISTORY
PrD – Preliminary Version. June 28, 2012
Rev. PRC| Page 2 of 10
Preliminary Technical Data
AD5750
OPERATING THE AD5750 EVALUATION BOARD
POWER SUPPLIES
The digital section of the AD5750 evaluation board can be powered from the USB port. This is the default setup. It can also be powered
by an external supply using the J7 power connector. Both analog GND and DGND inputs are provided on the board. The analog GND
and DGND planes are connected at one location close to the AD5750. Each supply is decoupled to the relevant ground plane with 10 μF
and 0.1 μF capacitors. Each device supply pin is also decoupled with a 10 μF and 0.1 μF capacitor pair to the relevant ground plane.
The AVDD and AVSS pins may be operated from +/-12v to +/-20v respectively (connector J17). The supply for the on board reference
can be supplied from AVDD or V+ (LK27). Note - Maximum supply for this reference is 18V. If using AVDD to supply the ADR434
AVDD will need to be limited to +18V. The external reference can be overdriven via connector J2.
LINK OPTIONS
A number of link and switch options on the evaluation board should be set for the required operating setup before using the board. Table
1 lists the default link options. The functions of these link options are described in detail in Table 2. The default setup is for control by
the PC via the USB port. The default setting also configures the on board reference and DAC to provide the analog input to the AD5750.
Table 1. Link Options Default
Link No.
Option (Default)
LK1
LK2
LK6
LK8
LK10
LK16
LK17
LK21
LK22
LK23
LK25
LK27
B
INSERTED
A
A
B
INSERTED
INSERTED
INSERTED
REMOVED
INSERTED
A
A
Table 2. Link Options
Link No.
Function
LK1
Used to Select whether on board DAC or external analog input used for 0-4.096v input.
• Position A: External source used.
• Position B: On Board DAC used.
LK2
Used to disconnect on board DAC if user wants to connect an external analog input.
LK6
This link selects the Power Supply source for the ADP3303.
• Position B: J7 is the power supply source for the ADP3303.
• Position A: The USB 5 V power supply source is the power supply source for the ADP3303.
LK8
This link selects the Power Supply source for the digital circuitry DVCC.
• Position B: ADP3303 output is used to supply the digital circuitry.
• Position A: The USB 5 V power supply source or J7 is the power supply source for the DVCC
LK10
This link selects what the VSS pin is connected to.
• Position B: VSS pin tied to GND
• Position A: VSS pin tied to J14 connector.
LK16
Used to connect voltage output to positive sense feedback.
LK17
Used to connect voltage output to negative sense feedback.
Rev. PrC | Page 3 of 10
AD5750
Preliminary Technical Data
LK21
Used to connect AVDD supply to AVDD pin on AD5750. Should be left inserted.
LK22
This link selects an external reference source to be used as reference/supply to the AD5662 and reference for the AD5750.
LK23
This link selects the on board ADR434 reference to be used as reference/supply to the AD5662 and reference for the
AD5750.
LK25
Used to determine the connection to Pin 32.
• Position A: Pin 32 tied to GND (selected in Sotware Mode)
• Position B: Pin 32 tied to pull up resistor (can be used in hardware mode)
LK27
Used to determine the Supply to the on board reference. Note. Maximum supply for this reference is 18V. If using AVDD
to supply the ADR434 AVDD will need to be limited to +18V.
• Position A: Reference is tied to AVDD
• Position B: Reference is tied to V+
Rev. PRC| Page 4 of 10
Preliminary Technical Data
AD5750
EVALUATION BOARD SOFTWARE
SOFTWARE INSTALLATION
The AD5750EBZ evaluation kit includes self-installing software on CD-ROM. The software is compatible with Windows® 2000 and
Windows® XP. If the setup file does not run automatically when you insert the CD, run the setup.exe file directly from the CD.
Install the software before connecting the evaluation board to the USB port to ensure that the evaluation board is correctly recognized
when connected to the PC.
1. After the installation from the CD-ROM has completed, connect the AD5750 evaluation board to the USB port using the cable
supplied.
2. The software detects the evaluation board. Follow the instructions on the dialog boxes that appear to complete the installation.
SOFTWARE OPERATION
1. From the Analog Devices menu, select Start > All Programs > Analog Devices >AD5750>AD5750 Evaluation Software. The following
screen should appear.
Figure 2. Main Window
2. Programming the AD5750 Analog Input.
This applies to SECTION 1 of the eval board software The analog input to the AD5750 is provided from the on board AD5662 16 bit
DAC. The AD5662 is a 16 bit 5v DAC. Both the power supply and the reference to the DAC are supplied from an on board reference
ADR434 (4.096v). This reference can be overdriven and an external reference supply can be connected via connector J2. To program the
AD5662 DAC, type the data word in the HEX field of the ‘Enter Data Word’ section. Then click OK to program the DAC. The ‘AD5662
Rev. PrC | Page 5 of 10
AD5750
Preliminary Technical Data
programmed word’ will display the programmed word to the DAC. If the user is using an external DAC there is no need to program the
on board DAC.
3. Configuring the AD5750 Range and Settings:
This applies to SECTION 2 of the evaluation board software. Using the Eval board, the AD5750 can be configured for the following
functions: OUTPUT RANGE, CLRSEL, CLEAR, OUTEN.
SELECT OUTPUT RANGE: The AD5750 output range is selected using a combination of the pull down menu (AD5750 output Range)
and the RSEL bit. The RSEL nominally selects whether the internal or external sense resistor is enabled but is also used as a decode bit to
allow for extra ranges (for example current mode over ranges and an extra voltage range). Table 3 shows the implementation and settings
for choosing all the available ranges.
Choose the output range required in the left hand column of the Table below.
Set the RSEL bit and ‘Output Range’ pull down menu accordingly to select the desired range.
Table 3. Choosing Output Range Configuration: 1) Choose the required range from the 1st column. 2) Set RSEL and the output
range on the evaluation to configure the AD5750 for this range.
Output Range Required
RSEL
Output Range Pull Down Menu
4-20ma output using External Current Sense Resistor Option
0
4 to 20ma Current Range
0-20ma output using External Current Sense Resistor Option
0
0 to 20ma Current Range
0-24ma output using External Current Sense Resistor Option
0
0 to 24ma Current Range
+/- 20ma output using External Current Sense Resistor Option
0
+/- 20ma Current Range
+/- 24ma output using External Current Sense Resistor Option
0
+/- 24ma Current Range
0-5v Voltage Range
0 or1
0-5v Voltage Range
0-10v Voltage Range
0 or1
0-10v Voltage Range
+/-5v Voltage Range
0 or1
+/-5v Voltage Range
+/-10v Voltage Range
0 or1
+/-10v Voltage Range
0-6v Voltage Range
0 or1
0-6v Voltage Range
0-12v Voltage Range
0 or1
0-12v Voltage Range
+/-6v Voltage Range
0 or1
+/-6v Voltage Range
+/-12v Voltage Range
0 or1
+/-12v Voltage Range
+/-2.5v Voltage Range
0
Range 1101
0V
0
Range 1110
0V
0
Range 1111
4-20ma output using Internal Current Sense Resistor Option
1
4 to 20ma Current Range
0-20ma output using Internal Current Sense Resistor Option
1
0 to 20ma Current Range
0-24ma output using Internal Current Sense Resistor Option
1
0 to 24ma Current Range
+/- 20ma output using Internal Current Sense Resistor Option
1
+/- 20ma Current Range
+/- 24ma output using Internal Current Sense Resistor Option
1
+/- 24ma Current Range
3.92-20.4ma using Internal Current Sense Resistor Option.
1
Range 1101
0ma -20.4ma using Internal Current Sense Resistor Option.
1
Range 1110
0ma – 24.5ma using Internal Current Sense Resistor Option.
1
Range 1111
CLRSEL: Selects the CLEAR condition, either Zero Scale or Full Scale of the selected Range. CLRSEL = 1 selects mid-scale of the selected
range, CLRSEL = 0 selects full-scale of the selected range.
CLEAR: Implements a Clear Condition. CLEAR =1 sets the CLEAR bit in the register and clears the output. CLEAR=0 enables the
output with the last code programmed.
OUTEN: Enables/ Disables the output. OUTEN=1 enables the output. OUTEN=0 disables the output
READBACK FROM THE AD5750:
This applies to SECTION 3 in the evaluation board software. Click ‘READ AD5750’ button to read back from the AD5750. The
following information is available:
Rev. PRC| Page 6 of 10
Preliminary Technical Data
AD5750
CLRSEL: Display the condition of the CLRSEL bit in the control register. CLRSEL = 1 means mid-scale of range selected, CLRSEL = 0
means full-scale of range selected.
OUTEN: Displays whether the output is or is enabled/disabled. OUTEN=1 means the output is enabled. OUTEN=0 means the output is
disabled.
RSEL: Displays the condition of the RSEL bit internally. RSEL= 0 means external sense resistor selected. RSEL=1 means internal sense
resistor selected.
OverTemp: This bit will get set if the core temp exceeds 150 oc.
Iout Fault: This bit will get set if there is an open circuit condition on the current output channel.
Vout Fault: This bit will set is there is a short circuit condition on the voltage output channel.
Output Range Config: This will show the selected output range configuration.
RESETTING THE AD5750:
Click ‘RESET AD5750’ to reset the AD5750. Reset=1 resets the part. Reset=0 puts the part back in normal mode.
TESTING THE OUTPUTS:
Voltage Output. The voltage output is available on the Vout channel. Connect this channel to a DVM to see the output voltage.
Current Output. The Current output is available on the Iout channel. On the AD5750 evaluation board the Iout output is terminated
with a +/-2.0 ppm/oC 250 ohm load resistor. This resistor is rated at 0.6W. The maximum output in current mode from the AD5750 is
24.5ma, therefore the maximum power dissipation using this resistor is 0.15W. Using the set-up provided, you can connect the Iout
channel to a DVM to monitor the output voltage and calculate output current.
Rev. PrC | Page 7 of 10
AD5750
Preliminary Technical Data
EVALUATION BOARD SCHEMATICS AND ARTWORK
Figure 3. Main Device Circuitry
Figure 4. USB controller Circuitry
Rev. PRC| Page 8 of 10
Preliminary Technical Data
AD5750
Figure 5. Component Placement
Figure 6. Top PCB Layer
Figure 7. Bottom PCB Layer
Rev. PrC | Page 9 of 10
AD5750
Preliminary Technical Data
BILL OF MATERIALS
Table 3.
Name
Part Description
Part Number
Stock Code
0.1uF 16V X7R Ceramic Capacitor
CM105X7R104K16AT
0.1uF 100V Ceramic Capacitor
10uF 10V SMD Tantalum Capacitor
10uF 63V Electrolytic Capacitor
2.2uF 10V Y5V Ceramic Capacitor
22Pf 50V NPO Ceramic Capacitor
C1206F104K1RAC
MCCTB106M010
EEEFK1J100P
9402098
2238 867 15229
C51
C53
D1, D2, D3, D4
J1
J2, J7, J14, J16, J17, J18
LK1, LK2, LK6, LK8, LK10, LK16, LK17,
LK21, LK22, LK23, LK25, LK27
R1, R2, R47
R3, R7, R9, R11, R15, R18, R26, R35, R36,
R37, R39, R40, R41, R42, R43, R48
R4, R5, R6, R19, R20, R21, R22
R16, R17
R23
R24, R25
R38
U1
10uF 35V Y5V Ceramic Capacitor
1uF 10V SMD Tantalum Capacitor
Red SMD LED
USB Mini-B Connector (usb-otg)
3 Pin Terminal Block (5mm Pitch)
GMK316F106ZL-T
TAJR105K010R
HSMH-C170
565790576
CTB5000/3
3 Pin (0.1" Pitch) Header & Shorting Shunt
M20-9990246
FEC 1216538
DNP
FEC 1288275
FEC 1190113
FEC 9696008
FEC 9402098
FEC 722005
Digikey 5871352-1-ND
FEC 197099
FEC 5790840
FEC 9786490
FEC 151790
FEC 1022249 &
150-411
DNP
0Ω, SMD Resistor
10kΩ, SMD Resistor
100kΩ, SMD Resistor
1kΩ, SMD Resistor
2.2kΩ, SMD Resistor
15kΩ, precision SMD Resistor
8 X 12 Analog Switch Array
MC 0.063W 0603
MC 0.063W 0603
MC 0.063W 0603
MC 0.063W 0603
MC 0.063W 0603
RN73C2A15KBTG
AD5750YCPZ
U2
U3
16-Bit nanoDAC with Reference
Precision Low Dropout Voltage Regulator
AD5662BRJZ-2500RL7
ADP3303ARZ-3.3
U4
USB Microcontroller
CY7C68013-56LFC
U5
64K EEPROM
24LC64-I/SN
U6
Y2
Reference
24 MHz , Plastic SMD Crystal
ADR434ARMZ
X24M000000S244
C1, C3,C18, C20, C21, C22, C23, C24, C25,
C26, C27, C28, C29, C30, C34, C45, C47,
C52, C55, C57
C2, C4, C5, C6, C61
C7, C40, C41, C42, C49
C8, C19, C46, C56
C9, C10, C48
C31
C32, C33
Rev. PRC| Page 10 of 10
FEC 9331662
FEC 9330399
FEC 9330402
FEC 9330380
FEC 9330810
FEC 1140932
AD5750YCPZ
AD5662BRJZ2500RL7
ADP3303ARZ-3.3
CY7C6801356LFC
Digikey 24LC64I/SN-ND
ADR434ARZ/ADR
434BRZ
FEC 9509658
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