LMH730316

LMH730316 SOT23-5 / SOT23-6 High Performance Amplifier Evaluation Board LMH730316 SOT23-5 / SOT23-6 High Performance Amplifier Evaluation Board General Description The LMH730316 evaluation board is designed to aid in the characterization of National Semiconductor’s high speed and / or low distortion Operational Amplifiers and is sold without any components installed for easy application adoption. This 4 layer board is designed to improve speed and reduce harmonic distortion by careful placement and routing of components and traces. Use the evaluation board as a guide for high frequency layout and as a tool to aid in device testing and characterization. National Semiconductor Application Note 2095 Hooman Hashemi November 1, 2010 Several components are mounted on the board bottom, while the DUT is installed on the top layer, for best performance. Here is a list of these components: Rf, RGa, C4, and RGND. For SOT23-6 devices with schematic pin 5 used for the disable function, resistor RTdis can be used (normally 50Ω) while an input at J4 can act as a disable signal. For a SOT23-5 device, schematic pin 5 is non-existent and the said components are thus “don’t care”. All board components are the SMT 0603 type, except the following listed in Table 1 TABLE 1. Board Components which are not "0603" type Reference Designator D1 Description Schottky diode, 1N5859, 40V (or equivalent) Shorting jumper (single supply operation only) Basic Operation This evaluation board supports both inverting and non-inverting configurations. For component locations refer to the schematic in Figure 1 . Note that the pin numbers correspond to the SOT23-6 package. For the SOT23-5 package, schematic pin 6 (VCC) is normally called pin 5 and schematic pin 5 does not exist (open). The board uses end mounted SMA connectors. On the +IN input, resistor RINa provides input termination. The resistors RTp and RINb are normally open and short, respectively, and are included for added flexibility (e.g. filtering, divider / attenuation, etc.) in configuring the amplifier. When using the evaluation board for non-inverting applications, load resistor RGa only (RGb and RTn left open). The resistors RGb and RTn are for use in the inverting configuration. When using this board for inverting applications, do not load RGa; instead load RGb and an appropriate value of RTn. Ro and RTo resistors comprise the output connection network which is usually configured for 50Ω operation (Ro= 50Ω , RTo= open). RGND Diode D1 (optional) is meant as protection to clamp the supplies in case VCC and VEE are accidentally reversed. For single-supply operation (VCC), short RGND to connect VEE to GND and do not power VEE pins on J5. When using a single supply it is important to pay attention to DC bias voltages. This board consists of four layers. All four layers are detailed in Figure 2 through Figure 5. AN-2095 © 2010 National Semiconductor Corporation 301394 www.national.com AN-2095 30139401 FIGURE 1. Evaluation Board Schematic www.national.com 2 AN-2095 30139402 FIGURE 2. Evaluation Board Top Layer 30139403 FIGURE 3. Evaluation Board Bottom Layer (bottom view) 3 www.national.com AN-2095 30139404 FIGURE 4. Evaluation Board Layer 2 (bottom view) 30139405 FIGURE 5. Evaluation Board Layer 3 (bottom view) www.national.com 4 AN-2095 5 www.national.com LMH730316 SOT23-5 / SOT23-6 High Performance Amplifier Evaluation Board For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers Audio Clock and Timing Data Converters Interface LVDS Power Management Switching Regulators LDOs LED Lighting Voltage References PowerWise® Solutions Temperature Sensors PLL/VCO www.national.com/amplifiers www.national.com/audio www.national.com/timing www.national.com/adc www.national.com/interface www.national.com/lvds www.national.com/power www.national.com/switchers www.national.com/ldo www.national.com/led www.national.com/vref www.national.com/powerwise WEBENCH® Tools App Notes Reference Designs Samples Eval Boards Packaging Green Compliance Distributors Quality and Reliability Feedback/Support Design Made Easy Design Support www.national.com/webench www.national.com/appnotes www.national.com/refdesigns www.national.com/samples www.national.com/evalboards www.national.com/packaging www.national.com/quality/green www.national.com/contacts www.national.com/quality www.national.com/feedback www.national.com/easy www.national.com/solutions www.national.com/milaero www.national.com/solarmagic www.national.com/training Applications & Markets Mil/Aero PowerWise® Design University Serial Digital Interface (SDI) www.national.com/sdi www.national.com/wireless www.national.com/tempsensors SolarMagic™ THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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