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1 Description

GND

Channel1(V1)

-V

Output(V )

OUT

ChannelSelect(SEL)

ChipEnable( )EN

Channel0(V0)

402W402W

User's Guide

SBOU049A – April 2007 – Revised April 2009

DEM-OPA-SO-1D Demonstration Fixture

The DEM-OPA-SO-1D demonstration fixture is an unpopulated printed circuit board (PCB) for single 2:1

multiplexers in SO-8 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 amplifier data sheets.

Figure 1. Buffer Pinout Compatible with DEM-OPA-SO-1D

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SBOU049A – April 2007 – Revised April 2009 DEM-OPA-SO-1D Demonstration Fixture 1

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Summary of content (6 pages)

PAGE 1
User's Guide SBOU049A – April 2007 – Revised April 2009 DEM-OPA-SO-1D Demonstration Fixture 1 Description The DEM-OPA-SO-1D demonstration fixture is an unpopulated printed circuit board (PCB) for single 2:1 multiplexers in SO-8 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 amplifier data sheets.
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Circuit 2 www.ti.com Circuit The circuit schematic illustrated in Figure 2 shows the connections for all possible components. J5 J3 R5 R4 EN SEL J1 R1 R3 J2 402W R2 J4 402W +VS -VS C1 C2 C3 C4 J6 Figure 2. Schematic 3 Components Components that have RF performance similar to those listed in Table 1 may be substituted. Table 1.
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Board Layout www.ti.com 4 Board Layout This demonstration board is a two-layer PCB; see Figure 3. It has separate ground and power planes in the inner layers. The ground plane has been opened up around op amp pins sensitive to capacitive loading. Power-supply planes are laid out to keep current-loop areas to a minimum. J1, J2 and J4 to be mounted horizontally onto the board edge. J3, and J4 are to be mounted vertically onto the board.
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Measurement Tips 5 www.ti.com Measurement Tips This demonstration board, and the component values shown, is designed to operate in a 75Ω environment for the input and output and 50Ω environment for the EN and SEL control pins. 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 amplifier and will alter their response.
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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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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.