Si4133/33M-EVB EVALUATION BOARD FOR THE SYNTHESIZER FAMILIES The board includes all support circuitry necessary to Description evaluate the synthesizer including a reference clock, Please note that only the Si4133-EVB and Si4133M- SMA connections for external measurement equipment, EVB are currently available. and an interface to a personal computer for controlling The other evaluation boards and kits described in the device. The PC software is a graphical, this document are obsolete, and their information is easy-to-use interface that allows the user to directly provided for reference only. enter frequencies, set divider ratios, and toggle power The Si4133/Si4133G synthesizer family evaluation control options by a parallel port connection. A PC and board is a complete, PC-based evaluation platform for power supply are all that is needed for a complete the following Skyworks Solutions devices and their evaluation system. derivatives: Features Si4133 Si4133G Single board evaluation platform Si4133G-X2 PC-based graphical control software included on Si4113G-X5 CD-ROM for Windows 95/98 Si4114G On-board frequency reference SMA for external Si4135 reference Si4136 SMA connections for synthesizer outputs For use with Skyworks Solutions Si4133, Si4133G, Si4133G-X2, Si4113G-X5, Si4114G, Si4135 and Si4136 synthesizer families (TSSOP or MLP) Function Block Diagram RFLA RFLB RFLC RFLD AUXOUT PC PC SCLK Interface RF1 RF2 SDATA JRF1 SENB + +5 V RFOUT Si41xx VDD + PWDNB +3 V JIF1 IFOUT IF Reference XIN RFLC RFLD Clock J1EXT Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 0.61 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 20, 2021Si4133/33M-EVB Both the multiplexed RF output and the IF output can be 1. Functional Description active simultaneously. Synthesizers are independently The evaluation board accommodates the synthesizer by enabled using the radio buttons in the evaluation providing clock circuitry, a PC interface, and other software. support circuitry necessary for operation. The synthesizer IC is supplied by three different power supplies. VDDR supplies the analog circuitry for the 1.1. Synthesizer RF1 and RF2 synthesizers. VDDI supplies the analog The heart of the evaluation board is the Skyworks circuitry for the IF synthesizer, and VDDD supplies the Solutions frequency synthesizer. This section includes digital prescaler, serial interface, and reference input the synthesizer integrated circuit (IC), external tuning circuitry. Each of these supplies is bypassed to ground components, output matching, and power supply with a 22 nF capacitor close to the body of the IC. decoupling circuitry. 1.2. PC Interface For devices requiring an external inductor to establish the center frequency for the RF1 and RF2 synthesizers, The frequency synthesizer IC uses a serial interface for the inductor is implemented with a printed trace. The IF programming. The three primary signals are serial data synthesizer inductor is set by an 0402-size chip (SDATA), serial clock (SCLK), and serial enable inductor. The inductors are set for the nominal center (SENB). These are all mapped to data pins of the PCs frequencies shown in Table 1. parallel port. Data is read back from the IC using the BUSY input of the parallel port and SCLK. Outputs of the synthesizers are ac-coupled and matched to a 50 load impedance. SMA connectors One additional signal, GPO, is a multipurpose signal are provided for easy connection to measurement used to control the synthesizers hardware power-down equipment or to target systems. Output JRF1 is enable (PWDNB) and/or to trigger external test multiplexed between the RF1 and RF2 synthesizers and equipment. The intended use is for power-up and is toggled through the evaluation software. See the channel-to-channel settling time measurements. See synthesizer data sheet for more detail. The second theEvaluation Softwar section for more detail. output, JIF1, is connected to the IF synthesizer output. Table 1. Center Frequencies Device RF1 Center RF2 Center IF Center Frequency (MHz) Frequency (MHz) Frequency (MHz) Si4133 1600 1200 550 Si4133G 1600 1200 550 Si4133G-X2 1600 1200 1080 Si4113G-X5 1540 1365 N/A Si4114G 1920 1780 N/A Si4135 1750 967 170.76, 420.76 Si4136 2400 2100 550 noise reduction on the tuning input. Test points JP9 and 1.3. Clock Circuitry JP10 allow easy connection to the tuning voltage for The reference frequency for the synthesizer is external frequency trimming or reference modulation. generated on-board by a temperature-compensated, voltage-tuned, crystal oscillator. The circuit is flexible to 1.4. Power Supplies allow evaluation with an external reference source or The evaluation board requires a 5 V supply at JP11 to with different frequency oscillators in varying packages. power the digital interface to the PC. The synthesizers Header JP6 selects the reference frequency source to supply voltage can be taken from the on-board 3V the frequency synthesizer IC. Either the on-board regulator or a user-supplied voltage at JP11 depending oscillator or the external SMA input, J8, can be on the jumper setting at JP4. selected. The tuning control of the oscillator, Vc, is fixed at (Vsupply/2) by R19 and R20. C14 provides filtering for 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 0.61 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice September 20, 2021