1 Description
1
2
3
4
5
10
9
8
7
6
+VCC
I ,Collector,C
OUT
S/HIn-
S/HIn+
Ground
Emitter,E
Base,B
CHOLD
-VCC
HoldControl
BJT
MSOP-10
User's GuideSBOU042A – November 2006 – Revised December 2008
DEM-OPA-MSOP-1A Demonstration Fixture
The DEM-OPA-MSOP-1A demonstration fixture is a generic, unpopulated printed circuit board (PCB) for asingle, wide bandwidth, DC restoration circuit in an MSOP-10 package. Figure 1 shows the packagepinout for this PCB. For more information on these types of op amps, as well as good PCB layouttechniques, see the individual amplifier data sheets.
Figure 1. MSOP Package Pinout, Top View
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SBOU042A – November 2006 – Revised December 2008 DEM-OPA-MSOP-1A Demonstration Fixture 1Submit Documentation Feedback
2 Circuit
VSP
VSN
VSP
C5
C6
R9
R2
R3
R4
Hold/Track
VSN
+
+
C3
C2
L1
TB1
L2
C4
1
2
3
4
5
10
9
8
7
6
+VCC
I ,Collector,C
OUT
S/HIn-
S/HIn+
Ground
Emitter,E
Base,B
CHOLD
-VCC
HoldControl
Component_1
U1
C1
R6
R7VIN
IOUT
R10
R8
R5
R1
VOUT
3 Components
Circuit
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The circuit schematic in Figure 2 shows the connections for all possible components. Each configurationuses only some of the components.
Figure 2. Schematic for DEM-OPA-MSOP-1A
Components that have RF performance similar to the ones in Table 1 may be substituted.
Table 1. Component Descriptions
PART DESCRIPTION
C
5
, C
6
Tantalum Chip Capacitor, SMD EIA Size 3216, 20VC
1
, C
3
, C
4
Multilayer Ceramic Chip Capacitor, SMD 0603, 50VC
C
Multilayer Ceramic Chip Capacitor, SMD 0805, 50VV
OUT
, V
IN
, Hld/Trade, I
OUT
SMA or SMB Board Jack (Amphenol 901-144-8)L
1
, L
2
EMI-Suppression Ferrite Chip, SMD 1206 (Steward LI 1206 B 900 R)TB
1
Terminal Block, 3.5mm Centers (On-Shore Technology ED555/3DS)R
XX
Metal Film Chip Resistor, SMD 0603, 1/8W
Please refer to Figure 3 for the location of the following components:•R
1
, R
3
, R
5
and R
6
set the desired input/output impedances of the Operational TransconductanceAmplifer (OTA) section when evaluated by itself.•R
2
is used to set the gain of the OTA section.•R
1
, R
7
, and R
8
set the desired input/output impedances of the sampling OTA section when evaluatedby itself•C
1
is the hold capacitor.•R
4
and R
9
sets the input impedance for the TTL control.•C
2
, C
3
, C
4
, C
5
, and C
6
are supply bypass capacitors. C
2
is optional; it adds a bypass between thesupplies, which may improve distortion performance.
2DEM-OPA-MSOP-1A Demonstration Fixture SBOU042A – November 2006 – Revised December 2008Submit Documentation Feedback
(a)TopLayer (b)MiddleLayer1
(c)bottomLayer (d)MiddleLayer2
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Components
•L
1
and L
2
are ferrite chips that can reduce interactions with the power supply at high frequencies. If notdesired, they can be replaced with 0 Ωresistors.
Figure 3. DEM-OPA-MSOP-1A Demonstration Fixture Layout
SBOU042A – November 2006 – Revised December 2008 DEM-OPA-MSOP-1A Demonstration Fixture 3Submit Documentation Feedback
4 Board Layout
5 Measurement Tips
Board Layout
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This demonstration fixture is a four-layer PCB. It uses a ground plane bottom layer. The ground plane hasbeen opened up around op amp pins that are sensitive to capacitive loading. Power-supply traces are laidout in the internal planes. The SMA (or SMB) connectors may be mounted horizontally onto the boardedge. The location and type of capacitors used for power-supply bypassing are crucial for high-frequencyamplifiers. The tantalum capacitors, C
5
and C
6
, do not need to be close to pins 4 and 14 on the PCB andmay be shared with other amplifiers. See the individual op amp data sheet for more information on properboard layout techniques and component selection.
This demonstration fixture, with the component values shown, is designed to operate in a 50 Ωenvironment; most data sheet plots are obtained under these conditions. It is easy to change thecomponent values for different input and output impedance levels. However, do not use high-impedanceprobes; they represent a heavy capacitive load to the op amp, and will alter the amplifier response.Instead, use low-impedance ( ≤500 Ω) probes with adequate bandwidth. The probe input capacitance andresistance set an upper limit on the measurement bandwidth. If a high-impedance probe must be used,place a 100 Ωresistor on the probe tip to isolate its capacitance from the circuit.
4DEM-OPA-MSOP-1A Demonstration Fixture SBOU042A – November 2006 – Revised December 2008Submit Documentation Feedback
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be completein terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit doesnot fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days fromthe date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OFMERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claimsarising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and allappropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANYINDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.
TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents orservices described herein.
Please read the User’s Guide and, specifically, the Warnings and Restrictions notice in the User’s Guide prior to handling the product. Thisnotice contains important safety information about temperatures and voltages. For additional information on TI’s environmental and/orsafety programs, please contact the TI application engineer or visit www.ti.com/esh .No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, orcombination in which such TI products or services might be or are used.FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSESONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which aredesigned to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments maycause interference with radio communications, in which case the user at his own expense will be required to take whatever measures maybe required to correct this interference.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of ±15V and the output voltage range of –15V to +15V.Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questionsconcerning the input range, please contact a TI field representative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,please contact a TI field representative.During normal operation, some circuit components may have case temperatures greater than +50 °C. The EVM is designed to operateproperly with certain components above +50 °C as long as the input and output ranges are maintained. These components include but arenot limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identifiedusing the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,please be aware that these devices may be very warm to the touch.
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