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SKY42068 Datasheet(PDF) 3 Page - Skyworks Solutions Inc. |
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SKY42068 Datasheet(HTML) 3 Page - Skyworks Solutions Inc. |
3 / 8 page PRELIMINARY DATA SHEET • SKY42068 ACTIVE MIXER Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 103210C • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • August 23, 2006 3 Table 4. SKY42068 Electrical Specifications (voltage supply = +5 V, TC = +25 °C, LO = 0 dBm, RF frequency = 900 MHz, IF frequency = 71 MHz, unless otherwise noted) Parameter Symbol Test Condition Min Typical Max Units RF RF input frequency 400 1000 MHz RF input VSWR (Note 1) 1.5:1 2.0:1 Mixer (Note 2) Conversion gain 2.5 dB Single side band noise figure 9.5 dB Input IP3 1 MHz tone spacing 36 dBm RF to IF leakage (Note 3) –40 dBm LO to IF leakage –25 dBm Input –1 dB compression point 2x2 product suppression (Note 4) +14 +17 –70 dBm dBc Local Oscillator LO input frequency (Note 5) 450 1200 MHz LO input VSWR (Note 1) 1.5:1 2.0:1 LO level input –5 0 +5 dBm LO1 to LO2 isolation 40 dB Intermediate Frequency IF output frequency 50 250 MHz IF output VSWR (Note 1) IF = 50 MHz to 200 MHz 1.5:1 2.0:1 Note 1: In a 50 Ω system obtained with external matching components on input/output ports. Note 2: Include RF balun and IF transformer losses. Note 3: Measured with an RF input power of –10 dBm. Note 4: Measured with an RF input power of –16 dBm. Note 5: Use high side LO injection for RF frequencies below 500 MHz. Evaluation Board Description The SKY42068 Evaluation Board is used to test the SKY42068 mixer performance. The SKY42068 Evaluation Board schematic diagram is shown in Figure 3. Figure 4 displays the Evaluation Board layout. The Bill of Materials (BOM) is provided in Table 5. Circuit Design Configurations The following design considerations are general in nature and must be followed regardless of final use or configuration: 1. Paths to ground should be made as short as possible. 2. The ground pad of the SKY42068 mixer has special electrical and thermal grounding requirements. This pad is the main thermal conduit for heat dissipation. Since the circuit board acts as the heat sink, it must shunt as much heat as possible from the mixer. As such, design the connection to the ground pad to dissipate the maximum wattage produced to the circuit board. Multiple vias to the grounding layer are required. 3. Two external output bypass capacitors are required on the VDD pin. The values of these capacitors will change with respect to the desired RF frequency. One capacitor should be used for low frequency bypassing and the other capacitor for high frequency bypassing. Special attention should be given so that the smaller value capacitor does not go into self-resonance at the desired RF frequency. 4. The RF input must be driven differentially. A 1:1 impedance ratio balun is recommended with a center tap on the secondary side that is a DC path to ground. Mixer Testing Procedure Use the following procedure to set up the SKY42068 Evaluation Board for mixer testing. Refer to Figure 5 for guidance: 1. Connect the SKY42068 Evaluation Board (J1) to a +5 VDC power supply using insulated supply cables. If available, enable the current limiting function of the power supply to 250 mA. |
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