AD8251-EVALZ User Guide
UG-925
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 AD8251 10 MHz, 20 V/μs, G = 1, 2, 4, 8 iCMOS Programmable
Gain Instrumentation Amplifier
FEATURES
GENERAL DESCRIPTION
Does not require software to operate
Runs from dual supply (±7 to ±15 V)
Gain selection through DIP switches
Numerous test points for external stimulus
Signal paths use SMA connectors
The AD8251-EVALZ user guide details how the AD8251EVALZ evaluation board1 evaluates the AD8251. The user guide
outlines the basic connections required to evaluate the AD8251 and
describes the switch settings available to obtain desired outputs.
Many configuration options are available on the AD8251EVALZ evaluation board that allow additional input filtering and
output filtering if there is a noisy environment (see Figure 6). The
logic control is covered with an on-board 5.0 V regulator and a
dual in-line package (DIP) switch. However, these logic signals
can be overridden and clipped on by way of the on-board test
points if the DIP switch has each position set to open.
EQUIPMENT NEEDED
Dual-output, programmable power supply (±15 V at +50 mA)
Dual-output function generator
Oscilloscope
Banana to grabber test leads
BNC to SMA coaxial cables
A small, flat head screw driver or similar device to set DIP
switches
1
If the purchased AD8251-EVALZ evaluation board is a version released prior
to 2015 (printed on the board), refer to the AD8251-EVALZ (Rev. 0) user guide
at https://wiki.analog.com/resources/eval/ad8250-evaluation-guide.
DOCUMENTS NEEDED
AD8251 data sheet
06838-001
AD8251-EVALZ EVALUATION BOARD PHOTOGRAPH
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. A | Page 1 of 6
UG-925
AD8251-EVALZ User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Required Equipment .....................................................................3
Equipment Needed ........................................................................... 1
Initial Configuration Procedure ..................................................3
Documents Needed .......................................................................... 1
Powering Up...................................................................................3
General Description ......................................................................... 1
Evaluation Board Schematic and Artwork.....................................5
AD8251 Evaluation Board Photograph ......................................... 1
Ordering Information .......................................................................6
Revision History ............................................................................... 2
Bill of Materials ..............................................................................6
Evaluation Board Software Quick Start Procedures .................... 3
REVISION HISTORY
This user guide is for the redesigned AD8251-EVALZ evaluation
board released in 2015 (printed on the board). If using the version
released prior to 2015, refer to the AD8251-EVALZ (Rev. 0) user
guide located at https://wiki.analog.com/resources/eval/ad8250evaluation-guide.
7/2016—Rev. 0 to Rev. A
Updated Content, Figures, and Specifications to Correspond
with the Updated AD8251-EVALZ Evaluation Board Released
in 2015 .................................................................................. Universal
6/2007—Revision 0: Initial Version
Rev. A | Page 2 of 6
AD8251-EVALZ User Guide
UG-925
EVALUATION BOARD SOFTWARE QUICK START PROCEDURES
REQUIRED EQUIPMENT
To perform the start-up operations outlined in this guide, use
the following items:
•
•
•
•
•
•
A dual-output, programmable power supply, such as the
Keithley 2230-30-1 supply.
A dual-channel function generator, such as the LeCroy
WaveStation 2012.
An oscilloscope, such as the LeCroy WaveSurfer 3034.
A small slotted screw driver, or similar device, to adjust the
three DIP switches within the SW3 DIP switch (see Figure 7).
Two black banana to grabber test leads, such as the
Pomona 3782-36-0.
Two red banana to grabber test leads, such as the
Pomona 3782-36-2.
Three BNC (male) to SMA (male) coaxial cables.
1
06838-002
•
2
CH1 100mV/DIV
0.0mV OFFSET
500kS
500µs/DIV
100MS/s
Figure 2. Output of the AD8251-EVALZ when G = 1
4.
Set Switch 3 on the SW3 DIP switch to set the gain to Gain
(G) = 2. The result must resemble Figure 3.
INITIAL CONFIGURATION PROCEDURE
3.
4.
5.
6.
1
2
CH1 100mV/DIV
0.0mV OFFSET
2.
3.
500kS
500µs/DIV
100MS/s
Figure 3. Output of the AD8251-EVALZ when G = 2
5.
If the output signal is at 100 mV amplitude, set Switch 3 on
the SW3 DIP switch to off and set Switch 2 to the on
position (G = 4). The result must resemble Figure 4.
POWERING UP THE AD8251-EVALZ EVALUATION
BOARD
1.
06838-003
2.
Before any connections are made, verify the initial DIP switch
configuration. Set all switches to the off position, as indicated
by the silkscreen (see Figure 7).
Set the power supply to ±15 V with a current limit of
25 mA each channel.
Set the function generator to produce a complementary
(in-phase and out-of-phase), 1 kHz sine wave, at a 50 mV
differential amplitude signal. Select the high impedance
setting on both outputs of the generator. For a 50 Ω signal
source, use 25 mV.
Ensure the signal generator outputs are off.
Connect the power supply leads from the power supply
source: +15 V to VIN+, −15 V to VIN−, and
Common/Ground to GND.
Connect the J3 output signal to any channel on the
oscilloscope and set the vertical setting to 100 mV/division.
Enable the power supply output. Observe the indicated
current consumption on the supply. The correct operation
does not exceed 15 mA.
Turn on the two channels of the function generator.
Observe the output of the AD8251 evaluation board on the
oscilloscope. The output must look similar to Figure 2,
showing a signal of 400 mV in amplitude.
1
06838-004
1.
2
CH1 100mV/DIV
0.0mV OFFSET
500kS
500µs/DIV
100MS/s
Figure 4. Output of the AD8251-EVALZ when G = 4 (200 mV Amplitude)
Rev. A | Page 3 of 6
UG-925
Finally, change the signal generator amplitude to a 10 mV
differential signal and set Switch 3 on the SW3 DIP switch
to the on position to set G = 8. The result must resemble
Figure 5.
7.
1
06838-005
6.
AD8251-EVALZ User Guide
2
CH1 100mV/DIV
0.0mV OFFSET
500kS
500µs/DIV
100MS/s
Figure 5. Output of the AD8251-EVALZ when G = 8
Rev. A | Page 4 of 6
If Switch 1 is set to on, the AD8251 does not update any
changes to the gain. Checking the gains validates the basic
operation of the AD8251-EVALZ.
AD8251-EVALZ User Guide
UG-925
06838-006
EVALUATION BOARD SCHEMATIC AND ARTWORK
Figure 6. AD8251-EVALZ Evaluation Board Schematic
GND U4
SET
OFF
SW3
WR
A1
A0
IN+
VIN+
OUT
GND
IN–
VIN–
GND
ANALOG
DEVICES
Figure 7. AD8251-EVALZ Silkscreen
Rev. A | Page 5 of 6
06838-007
AD8250
AD8251
AD8253
UG-925
AD8251-EVALZ User Guide
ORDERING INFORMATION
BILL OF MATERIALS
Table 1.
Qty
1
6
2
2
3
3
6
2
5
1
1
1
1
1
Reference Designator
J5
R3, R4, R6, R7, R9, R15
C4, C5
C6, C7
R1, R2, R5
J13, J14, J16
J7, J9 to J12, J15
J6, J8
C8, C9, C11 to C13
R8
SW3
U4
LED1
U1
4
J1 to J4
Description
Standard 2.54 mm spacing, 2-pin header
Resistors 0 Ω short, 0603
Capacitors, 0.01 μF, 50 V, 0603
Capacitors, 0.22 μF, 0805, C0G
Resistors, 10 kΩ, 0603
Black, large test points
Black, large test points
Red, large test points
Capacitors, 2.2 μF, 1206, 25 V
Resistor, 330 Ω, 1%
3-way DIP switch
Standard 12 V linear regulator
Blue LED, 3.4 V typical, 0805
AD8251 programmable gain instrumentation
amplifier (PGIA)
Standard size, end launch SMA connectors
Manufacturer
TE Connectivity
Vishay
Vishay
Kemet
KOA Speer
Kobiconn
Kobiconn
Kobiconn
Vishay
Vishay
CTS
STMicroelectronics
Lite-On
Analog Devices, Inc.
Part Number
826646-2
CRCW06030000Z0EA
VJ0603Y103KXAAC
C0603X224K3RACTU
RK73H1JTTD1002F
151-103-RC
151-103-RC
151-107-RC
VJ1206V225MXXTW1BC
CRCW0603330RFKEA
209-3LPST
L78M05CDT-TR
LTST-S220TBKT
AD8251ARMZ
Molex
0732511150
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.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until
you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices,
Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer
may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written
notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED,
RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF
INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S
POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES
SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will
comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of
the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts,
and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is
expressly disclaimed.
©2015–2016 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG06838-0-7/16(A)
Rev. A | Page 6 of 6
