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MAX2620EVKIT Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX2620EVKIT Datasheet(HTML) 3 Page - Maxim Integrated Products |
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3 / 4 page  out. Use the test port provided on the MAX2620 EV kit to facilitate measurement by installing a 1000pF capac- itor at C2 and removing C5. (Remove C2 and install C5 to use the MAX2620 as an oscillator.) When using the test port, subtract an approximately 586ps electrical delay from the S11 measurement (this delay can be compensated for on most modern vector network ana- lyzers) to account for the delay of the transmission line from the test port to the MAX2620 TANK pin. The test port should provide a negative input resistance and thus return gain when S11 is measured on a vector net- work analyzer. This return gain provides measurement data that is outside the unit circle of the Smith chart. A useful technique is to configure the vector network ana- lyzer to display 1/S11 for this measurement. The vector network analyzer displays the information inside the unit circle of the Smith chart. Most modern vector network analyzers perform this conversion. Input-impedance data presented in this format (1/S11) is the complement of the input impedance, which is the impedance desired to pro- vide the MAX2620 with feedback to oscillate at a particu- lar frequency. The Typical Operating Characteristics sec- tion of the MAX2620 data sheet contains a plot of 1/S11 for specific values of C3 and C4 provided in the MAX2620 EV kit. Also refer to the Tank Circuit Design section in the MAX2620 data sheet. The MAX2620 EV kit uses a low-voltage varactor. With the coupling capacitor C17 kept small, the oscillator cir- cuit is less affected by losses in the varactor. However, keeping C17 small also reduces overall tuning range. L1 on the MAX2620 is a ceramic coaxial resonator, which provides the best phase-noise performance. For cost-sensitive applications, the layout for L1 on the MAX2620 EV kit is a dual pad that accepts either a spring coil or a ceramic coaxial resonator. When prop- erly specified, coaxial resonators provide tight toler- ance inductance at very high Q for best circuit perfor- mance. Spring coils, such as Coilcraft mini-spring coils, provide a good cost/performance compromise for cost- sensitive applications. _____________Layout Considerations The MAX2620 EV kit can serve as a guide for your board layout. To minimize the effects of parasitic ele- ments, which may alter circuit performance, remove the ground plane around and under the components that make up the resonant circuit (C3–C6, C17, D1, and L1). Keep PC board trace lengths as short as possible to minimize parasitic inductance. Also keep decoupling capacitors C1, C7, and C9 as close to the MAX2620 as possible, with direct connection to the ground plane. MAX2620 Evaluation Kit _______________________________________________________________________________________ 3 C13 1.5pF C14 OPEN C12 1000pF C9 1000pF L3 10nH R4 OPEN 50 Ω 50 Ω C11 OPEN C10 1000pF L4 OPEN R5 51 Ω MAX2620 U1 OUT 8 1 2 3 4 7 6 5 VCC1 VCC VCC C8 1000pF R1 10 Ω C1 1000pF C2 OPEN 50 Ω C17 1.5pF L1 C6 1pF C5 1.5pF C3 2.7pF C4 1pF R3 10 Ω VCC VCC VCC GND C15 10 µF 25V SHDN 1 2 3 C7 1000pF J1 D1 R2 1k JU1 SMA SMA TEST PORT OUT OUT VCONT TANK FDBK SHDN VCC2 GND OUT SMA VCC SMA Figure 1. MAX2620 EV Kit Schematic |
Similar Part No. - MAX2620EVKIT |
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