User's Guide SBAU117A - February 2006 - Revised April 2011 DEM-BUF-SOT-1A Demonstration Fixture 1 Description The DEM-BUF-SOT-1A demonstration fixture is an unpopulated printed circuit board (PCB) for buffers (BUFs) in SOT23-5 packages. Figure 1 shows the package pinout for this PCB. For more information on these op amps, and good PCB board layout techniques, see the individual buffer data sheets. Out 1 5 +VCC 4 In 50kW x1 50kW -VCC 2 VREF 3 200W x1 4 5 SOT23-5 3 2 1 AWO Pin Orientation/Package Marking Figure 1. Package Pinout All trademarks are the property of their respective owners. SBAU117A - February 2006 - Revised April 2011 Submit Documentation Feedback DEM-BUF-SOT-1A Demonstration Fixture Copyright (c) 2006-2011, Texas Instruments Incorporated 1 Circuit 2 www.ti.com Circuit The circuit schematic illustrated in Figure 2 shows the connections for all possible components. Each configuration will only use some of the components. R2 U1 In C1 R3 In R1 VMID -VS +VS +VS -VS R4 Out Out BUF602IDBV +VS LP C2 C4 C3 C5 TB1 CPN LN -VS Figure 2. Schematic 3 Components Components that have RF performance similar to those listed in Table 1 may be substituted. Table 1. Component Descriptions PART DESCRIPTION C4, C5 Tantalum chip capacitor, SMD EIA size 3216, 20V CFN, C2, C3 Multi-layer ceramic chip capacitor, SMD 0805, 50V In, Out SMA or SMB board jack (Amphenol 901-144-8) LP, LN EMI-suppression ferrite chip, SMD 0805 (Steward LI 0805 B 900 R) TB Terminal block, 3.5mm centers (On-Shore Technology ED555/3DS) Rx Metal film chip resistor, SMD 0603, 1/8W The location of the following components is illustrated in Figure 3. R1 is the input resistance matching the source impedance. C1 is a placeholder component, and can be either a 25 resistor for DC-coupled applications or a capacitor for AC-coupled applications. When using C1 for AC-coupled applications, consider using the on-chip mid-reference supply for adequate bypassing. R4 is the output resistor. R2 is added to connect the mid-reference supply to the input, if required. LP and LN are ferrite chips that can reduce interactions with the power supply at high frequencies; if not desired, they can be replaced with 0 resistors. The power supplies are each respectively bypassed with two capacitors: C2 and C4 for the positive supply, and C3 and C5 for the negative supply. C4 and C5 are usually set between 2.2F and 6.8F, where C2 and C3 are 0.1F ceramic capacitors. CPN, usually set at 10,000pF, is connected between the positive and negative power supplies. 2 DEM-BUF-SOT-1A Demonstration Fixture SBAU117A - February 2006 - Revised April 2011 Submit Documentation Feedback Copyright (c) 2006-2011, Texas Instruments Incorporated Board Layout www.ti.com 4 Board Layout This demonstration fixture is a two-layer PCB. The ground plane has been opened up around op amp pins sensitive to capacitive loading. Power supplies 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 to high-frequency amplifiers. The tantalum capacitors, C4 and C5, do not need to be as close to pins 2 and 5 on the PCB and may be shared with other amplifiers. See the individual op amp data sheets for more information on proper board layout techniques and component selection. 5 Measurement Tips This demonstration fixture, and 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. Do not use very high impedance probes; they represent a heavy capacitive load to the BUFs and will alter their 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. SBAU117A - February 2006 - Revised April 2011 Submit Documentation Feedback DEM-BUF-SOT-1A Demonstration Fixture Copyright (c) 2006-2011, Texas Instruments Incorporated 3 Measurement Tips www.ti.com Note: The board name shown in the silkscreen for an earlier version the fixture is DEM-BUF6xxD with the Revision A design finalized in May 2004. Figure 3. DEM-BUF-SOT-1A Demonstration Board Layout 4 DEM-BUF-SOT-1A Demonstration Fixture SBAU117A - February 2006 - Revised April 2011 Submit Documentation Feedback Copyright (c) 2006-2011, Texas Instruments Incorporated Revision History www.ti.com Revision History Changes from Original (February, 2006) to A Revision ................................................................................................. Page * Updated Figure 3. Added footnote ..................................................................................................... 4 NOTE: Page numbers for previous revisions may differ from page numbers in the current version. SBAU117A - February 2006 - Revised April 2011 Submit Documentation Feedback Copyright (c) 2006-2011, Texas Instruments Incorporated Revision History 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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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 +30 C. The EVM is designed to operate properly with certain components above +85 C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using 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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