LMH730216/NOPB

LMH730227/LMH730216/LMH730165 Single High Speed Op Amp Evaluation Boards (SOIC, SOT-23, and SC-70) The LMH730227, LMH730216 and LMH730165 evaluation boards are designed to aid in the characterization of National Semiconductor's High Speed monolithic amplifiers. • LMH730227 — SOIC packages • LMH730216 — SOT-23 packages • LMH730165 — SC-70 packges Use the evaluation boards as a guide for high frequency layout and as a tool to aid in device testing and characterization. The evaluation boards accommodate general purpose amplifiers, as well as amplifiers with the following features: • Supply current adjustment via external Resistor • Output disable The evaluation board schematic is shown below. Refer to the product data sheets for recommendations for component values. BASIC OPERATION These boards have identical circuit configurations and are designed to accommodate both non-inverting and inverting operation. By changing RT or RIN and ROUT different input and output impedances can be matched. The SMA connectors and board traces are optimized for 50Ω operation, however other impedances can be matched as shown below. Inverting Gain = RF/RG (Input Resistance = RT || RG) Non Inverting Gain = 1 + RF/(RG + RT) (Input Resistance = RIN) (RT may be set to zero for non inverting operation) For current feedback operational amplifiers be careful to use appropriate values of RF. In addition the required value of RG will limit choices for input impedance with Inverting gains. 20066601 FIGURE 1. SOT-23 and SC-70 Schematic © 2008 National Semiconductor Corporation 200666 www.national.com LMH730227/LMH730216/ LMH730165 Single High Speed Op Amp Evaluation Boards (SOIC, SOT-23 and SC-70) December 4, 2008 LMH730227,LMH730216 signing your own board use these evaluation boards as a guide and follow these steps to optimize high frequency performance: LAYOUT CONSIDERATIONS Printed circuit board layout and supply bypassing play major roles in determining high frequency performance. When de- 20066602 FIGURE 2. SOIC Schematic 20066603 FIGURE 3. Probe Schematic www.national.com 2 and raising RG to obtain higher input impedance may require compromising device performance at large values of inverting gain. The disable trace has provisions for input termination. There are also pads for series resistance and capacitance for programmable gain parts. See part datasheets for suggested values. Sample artwork for National's Evaluation boards is included below. The board is designed for 50Ω input and output connections into coaxial cables. For other impedances the terminating resistors can be modified to help match different impedances. Do not use normal oscilloscope probes to test these circuits. The capacitive loading will change circuit performance drastically. Instead use low impedance resistive divider probes of 100 to 500Ω. See Figure 3 for a sample resistive probe. The Low impedance resistor should be 50-450Ω. The ground connection should be as short as possible (~1/2"). Even with careful use of these probes results should be considered preliminary until verified with controlled impedance measurements. Even the best probes will interfere with circuit operation to some degree. Also, conductors, fingers etc. near the device will change measurement results. Use a ground plane Include large (~6.8μF) capacitors on both supplies. Near the device use .01μF ceramic capacitors from both supplies to ground C1, C3. 4. Near the device use a .1μF ceramic capacitor between the supplies C5. 5. Remove the ground and power planes from under and around the part, especially the input and output pins. 6. Minimize all trace lengths. 7. Use terminated transmission lines for long traces. 8. High-speed disable/enable operation requires that the enable pin be treated as a signal input. Diode D1 is to protect the device from reverse polarity supply connections and will not be necessary for most designs. Capacitor C5 is necessary for best Harmonic Distortion performance. If C5 is not used increase the values of C1 and C3 to .1μF. RIN, RT and ROUT are all impedance matching resistors. RIN and ROUT should be equal to the desired input/output impedance. RT || RG should equal the desired inverting input impedance. Note that with current feedback op amps, the optimum value of RF and RG is determined by the desired gain National Semiconductor Layer1 Silk National Semiconductor Layer2 Silk 20066604 20066605 SOIC Board Layout (Actual size = 1.5" x 1.5"). The boards may be marked as CLC730227 or LMH730227 3 www.national.com LMH730227,LMH730216 1. 2. 3. LMH730227,LMH730216 National Semiconductor Layer2 Silk National Semiconductor Layer1 Silk 20066610 20066611 SOT-23 Board Layout (Actual size = 1.5" x 1.5"). National Semiconductor Layer1 Silk National Semiconductor Layer2 Silk 20066609 20066608 SC-70 Board Layout (Actual size = 1.5" x 1.5") www.national.com 4 LMH730227,LMH730216 www.national.com 5 LMH730227/LMH730216/ LMH730165 Single High Speed Op Amp Evaluation Boards (SOIC, SOT-23 and SC-70) Notes For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Design Support Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench Audio www.national.com/audio App Notes www.national.com/appnotes Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns Data Converters www.national.com/adc Samples www.national.com/samples Interface www.national.com/interface Eval Boards www.national.com/evalboards LVDS www.national.com/lvds Packaging www.national.com/packaging Power Management www.national.com/power Green Compliance www.national.com/quality/green Switching Regulators www.national.com/switchers Distributors www.national.com/contacts LDOs www.national.com/ldo Quality and Reliability www.national.com/quality LED Lighting www.national.com/led Feedback/Support www.national.com/feedback Voltage Reference www.national.com/vref Design Made Easy www.national.com/easy PowerWise® Solutions www.national.com/powerwise Solutions www.national.com/solutions Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero Temperature Sensors www.national.com/tempsensors Solar Magic® www.national.com/solarmagic Wireless (PLL/VCO) www.national.com/wireless Analog University® www.national.com/AU THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. 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