EL5306 - Demo Board ® Technical Brief June 9, 2009 TB441.1 Using The EL5306 Demo Board Supply Operation The EL5306 fixed gain Amp demo board simplifies the evaluation of the EL5306, a 350MHz bandwidth high-speed amplifier. Its circuit configuration sets the gain of 2 on the demo board. For detail application, please refer to the EL5306 data sheet. The EL5306 possess single and dual supply operation, from 5V to 10V. Each channel has a disable function. Upon being disabled, the outputs are tri-stated and the power supply current reduces to less than 12µA per amplifier. Allowing Enable Pin to float, or applying a low logic level will enable the amplifier. Features Layout Considerations • 350MHz Bandwidth for gain of +1, -1, and +2. The PC board layout has been optimized for high-speed signals. Careful attention was given to the signal paths, power supply bypassing, and grounding. All the input and output signal paths are 50Ω MicroStrip line. The output resistor ROUT is placed very close to the output pin to minimize the output stray capacitance. Small surface mount ceramic capacitors are placed as close as possible to the supply pins. • Optional Selectable Gain (+1, -1, +2) • Fully assemble and tested Detailed Description Voltage - Gain Adjustment The EL5306's gain can be selected by changing the values of Jumpers on the demo board (see Table 1) TABLE 1. RESISTOR VALUES FOR VARIOUS GAINS GAIN (dB) R1 (Ω) R2 (Ω) R3 (Ω) R4 (Ω) BANDWIDTH (MHz) +1 0 open 0 open 250 -1 open 0 0 open 380 +2 0 open open 0 350 1 Evaluation Set Up 1. Use a ±5V supply. Connect the +5V to VS+ pin and the -5V to VS- pin. Connect power supply ground to the GND pin. 2. Supply a signal of ± 1V at 1MHz to the INPUT SMA connector. 3. Connect the OUTPUT SMA connector to an oscilloscope through a 50Ω cable. 4. Turn on the power supply and verify the output signal of 1V on the oscilloscope. CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2008. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. Technical Brief 441 EL5306 Schematic RA3 OPEN RA4 0 RA1 0 INA 1 RA2 OPEN RAIN 49.9 16 + 2 RAOUT 49.9 15 - OUTA ENA VS- 3 ENB VS+ 4 RB1 0 INB RBIN 49.9 ENC 6 NC 11 NC + RCOUT 49.9 10 - 8 RC2 OPEN RCIN 49.9 RBOUT 49.9 OUTB 12 7 RC1 0 VS+ 13 - 5 RB2 OPEN INC VS+ 14 OUTC 9 EL5306 RC3 OPEN RC4 0 RB3 OPEN RB4 0 VS+ VS+ C1 4.7µF CBP C2 4.7µF CBP 0.1µF GND GND 0.1µF VS- VS- 2 TB441.1 June 9, 2009 Technical Brief 441 EL5306 Bill of Materials DESIGNATION QTY MANUFACTURER MFG. PART NUMBER DUT 1 EL5306 Intersil EL5306 PCB 1 Printed Circuit Board, SOIC 16 DDI EL5396/7 Fixed Gain Amp C1, C2 2 4.7µF, 10% Tantalum Capacitors VISHAY 293D475X9016B2T CBP 2 0.1µF, 20% Ceramic Capacitors PHILIPS 08052E104M9BB0 RINA, RINB, RINC, REA, REB, REC, RAOUT, RBOUT, RCOUT 9 49.9Ω, 1% Ceramic Resistors RΩ MCR10F49R9 RA1, RB1, RC1 3 0Ω, 1% (install only for Av = +1, +2) RΩ MCR10F00R0 RA3, RB3, RC3 3 0Ω, 1% (install only for Av = +1) RΩ MCR10F00R0 RA4, RB4, RC4 3 0Ω, 1% (install only for Av = +2) RΩ MCR10F00R0 RA2, RB2, RC2, RA3, RB3, RC3 6 0Ω, 1% (install only for Av = -1) RΩ MCR10F00R0 GND, VS+, VS- 3 Banana Jacks SPC TECHNOLOGY 39N867 VINA, VINB, VINC, ENA, ENB, ENC, OUTA, OUTB, OUTC 9 SMA 50Ω Straight Jack Connector JOHNSON COMPONENTS 98F1467 4 # 6 Internal Tooth Lock Washer OLANDER 6NILWS 4 6-32x.375”Lg., Phillips Pan Head OLANDER 6C37PPMS 4 6-32x.50”Lg., Hex Standoff, 1/4” Hex Dia OLANDER 6C50HF4U 3 DESCRIPTION TB441.1 June 9, 2009 Technical Brief 441 EL5306 Demo Board Layout FIGURE 1. TOP LAYER FIGURE 2. BOTTOM LAYER Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 4 TB441.1 June 9, 2009