User's Guide SBOU003B - May 1998 - Revised May 2010 DEM-OPA-SO-2A Demonstration Fixture 1 Description The DEM-OPA-SO-2A demonstration fixture is a generic, unpopulated printed circuit board (PCB) for dual high-speed operational amplifiers in SO-8 packages. Figure 1 shows the package pinout for this PCB. For more information on these op amps, as well as good PCB layout techniques, see the individual amplifier data sheets. Out A 1 8 +VS -In A 2 7 Out B +In A 3 6 -In B -VS 4 5 +In B Figure 1. SO Package Pinout, Top View 2 Circuit The circuit schematic in Figure 2 shows the connections for all possible components. Each configuration uses only some of the components. R3A R2A 3 R4A 2 J1A IN A R1A R7A 1 4 R5A J2A Out A C4 R6A P1 L2 -VS + C2 GND C3 L1 +VS + C1 C5 R3B R2B 5 R4B 6 J1B IN B R1B R5B 8 7 R7B J2B Out B R6B Figure 2. Schematic for DEM-OPA-SO-2A All trademarks are the property of their respective owners. SBOU003B - May 1998 - Revised May 2010 DEM-OPA-SO-2A Demonstration Fixture Copyright (c) 1998-2010, Texas Instruments Incorporated 1 Components 3 www.ti.com Components Components that have RF performance similar to the ones listed in Table 1 may be substituted. Table 1. Component Descriptions PART DESCRIPTION C1, C2 Tantalum Chip Capacitor, SMD EIA Size 3528, 20V C3 - C5 Multilayer Ceramic Chip Capacitor, SMD 1206, 50V J1A - J2B SMA or SMB Board Jack (Amphenol 901-144-8) L1, L2 EMI-Suppression Ferrite Chip, SMD 1206 (Steward LI 1206 B 900 R) P1 Terminal Block, 3.5mm Centers (On-Shore Technology ED555/3DS) R1A - R7B Metal Film Chip Resistor, SMD 1206, 1/8W R1 and R7 set the I/O impedance; R2 through R6 set the gain; and C1 through C5 are supply bypass capacitors. C3 is optional; it adds a bypass between the supplies that improves distortion performance for some models. L1 and L2 are ferrite chips that can reduce interactions with the power supply at high frequencies. If not desired, they can be replaced with 0 resistors. For single-supply operation, do not connect L2; otherwise, the -VS input to P1 would be at ground potential. Standard Current-Feedback Op Amps--These op amps have the pinout illustrated in Figure 1. Table 2 lists typical values used for these parts. To select component values (especially R6) for a specific op amp , consult the respective data sheet. Table 2. Standard Current-Feedback Op Amps (1) (1) 2 COMPONENT DUAL-SUPPLY (G = +2) DUAL-SUPPLY (G = -1) SINGLESUPPLY (G = +1) R1 49.9 57.6 49.9 R2 10.0 Open 10.0 R3 Open 10.0 Open R4 Open 402 Open R5 402 Open Open R6 402 402 402 R7 49.9 49.9 49.9 2.2mF C1, C2 2.2mF 2.2mF C3 0.01mF 0.01mF Open C4, C5 0.1mF 0.1mF 0.1mF The values and gains listed here will not work for all op amps. See the specific data sheet to select proper values. The I/O impedances are 50. DEM-OPA-SO-2A Demonstration Fixture Copyright (c) 1998-2010, Texas Instruments Incorporated SBOU003B - May 1998 - Revised May 2010 Components www.ti.com Standard Voltage-Feedback Op Amps--These op amps have the pinout shown in Figure 1. Table 3 lists typical values used for these parts. To select component values for a specific op amp (especially R6), consult the respective data sheet. Table 3. Standard Voltage-Feedback Op Amps (1) (1) COMPONENT DUAL-SUPPLY (G = +2) DUAL-SUPPLY (G = -1) SINGLESUPPLY (G = +1) R1 49.9 57.6 49.9 R2 178 Open 0 R3 Open 210 Open R4 Open 402 Open R5 402 Open Open R6 402 402 24.9 R7 49.9 49.9 49.9 C1, C2 2.2mF 2.2mF 2.2mF C3 0.01mF 0.01mF Open C4, C5 0.1mF 0.1mF 0.1mF The values and gains listed here will not work for all op amps. See the specific data sheet to select proper values. The I/O impedances are 50. Fixed Gain Amplifiers--For fixed gain amplifiers use internal resistors to set the gain at +1, +2 or -1. Use the recommended values given in Table 2, except for the changes listed in Table 4. Table 4. Fixed Gain Amplifiers Changes COMPONENT DUAL-SUPPLY (G = +2) DUAL-SUPPLY (G = -1) SINGLESUPPLY (G = +1) R4 Open 0 Open R5 0 Open Open R6 Open Open Open SBOU003B - May 1998 - Revised May 2010 DEM-OPA-SO-2A Demonstration Fixture Copyright (c) 1998-2010, Texas Instruments Incorporated 3 Board Layout 4 www.ti.com Board Layout This demonstration fixture is a two-layer PCB. (See Figure 3.) It uses both a ground plane and power traces on the inner layers. The ground plane has been opened up around op amp pins that are sensitive to capacitive loading. Power-supply traces are laid out to keep current loop areas to a minimum. The SMA (or SMB) connectors may be mounted either vertically or horizontally onto the board edge. The location and type of capacitors used for power-supply bypassing are crucial for high-frequency amplifiers. The tantalum capacitors, C1 and C2, do not need to be close to pins 8 and 4 on the PCB and may be shared with other amplifiers. See the individual op amp data sheet for more information on proper board layout techniques and component selection. GLUE AREA OUTA OUTB R7A R7B R6A OUTB J2B R6B OUTA J2A C5 R5A Pin 1 U1 R4A R2A R7A C4 R3A R1A C2 C3 R5B DEM-OPA-SO-2A R4B REV. B (MAY 2010) R2B R38 INB J1B R18 C1 INA INA J1A INB L2 L1 P1 -VS GND +VS +VS GND -VS (a) Component Side Silkscreen and Metal (1) (b) Ground Plane Side Silkscreen and Metal (bottom view) The board name shown in the silkscreen for an earlier version of the fixture is DEM-OPA268xU with the Burr-Brown Revision A design finalized in May 1998. Figure 3. DEM-OPA-SO-2A Demonstration Board Layout 5 Measurement Tips This demonstration fixture, with the component values shown, is designed to operate in a 50 environment; most data sheet plots are obtained under these conditions. It is easy to change the component values for different input and output impedance levels. However, do not use high-impedance probes; they represent a heavy capacitive load to the op amp, and will alter the amplifier response. Instead, use low-impedance ( 500) probes with adequate bandwidth. The probe input capacitance and resistance set an upper limit on the measurement bandwidth. If a high-impedance probe must be used, place a 100 resistor on the probe tip to isolate its capacitance from the circuit. 4 DEM-OPA-SO-2A Demonstration Fixture Copyright (c) 1998-2010, Texas Instruments Incorporated SBOU003B - May 1998 - Revised May 2010 REVISION HISTORY www.ti.com REVISION HISTORY Changes from A Revision (April, 2006) to B Revision ................................................................................................... Page * Changed silkscreen image in Figure 3 ................................................................................................ 4 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. SBOU003B - May 1998 - Revised May 2010 Revision History Copyright (c) 1998-2010, Texas Instruments Incorporated 5 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 PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards. 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