Evaluate: MAX2470/MAX2471 19-4797 Rev 0 2/99 MAX2470/MAX2471 Evaluation Kits General Description Component Lists The MAX2470/MAX2471 evaluation kits (EV kits) simplify Common Components for the evaluation of the MAX2470/MAX2471 VCO buffer MAX2470/MAX2471 EV Kits amplifiers. They enable testing of the devices perfor- mance and require no additional support circuitry. All DESIGNATION QTY DESCRIPTION inputs and outputs use SMA connectors to facilitate easy 2200pF, 10%, 25V ceramic-chip connection of RF test equipment. C1, C2, C3, C5 4 capacitors (0603) The MAX2470 EV kit is assembled with the MAX2470 10F, 10%, 10V tantalum capacitor and provides one high-impedance input (with pads to C6 1 AVX TAJC106K016 terminate to 50) and a pair of matched 50 differential outputs. JU1 sets the logic level at the HI/LO bias-control Optional 50 input-termination resis- R3, R4 2 input, allowing for selection between 10MHz to 500MHz tors (0603) (not installed) and 10MHz to 200MHz operation. The MAX2471 EV kit is SMA connectors (PC top mount) J1, J2, J3 3 assembled with the MAX2471 and provides two high- E.F. Johnson 142-0701-216 impedance inputs (with pads to terminate to 50) and a Test points pair of matched 50 differential outputs. J5, J6 2 Mouser 151-203 None 1 MAX2470/2471EVKIT PC board Features None 1 MAX2470/MAX2471 EV kit manual Easy Evaluation of MAX2470/MAX2471 +2.7V to +5.5V Single-Supply Operation Additional Components for On-Board Input-Frequency Range Selection MAX2470 EV Kit (MAX2470) DESIGNATION QTY DESCRIPTION Single-Ended (MAX2470) or 2200pF, 10%, 25V ceramic-chip C7 1 Differential (MAX2471) Inputs capacitor (0603) All Critical Peripheral Components Included 3-pin header (0.100 centers) JU1 1 Digi-key S1012-36-ND Shunt (jumper) JU1 1 Ordering Information Digi-key S9000-ND R1 1 0, 5% chip resistor (0603) IC SOT PART TEMP. RANGE R2 1 1k, 5% chip resistor (0603) PACKAGE TOP MARK U1 1 MAX2470EUT MAX2470EVKIT -40C to +85C SOT23-6 AAAX MAX2471EVKIT -40C to +85C SOT23-6 AAAY Additional Components for MAX2471 EV Kit Component Suppliers DESIGNATION QTY DESCRIPTION SUPPLIER PHONE FAX URL 2200pF, 10%, 25V ceramic-chip C4 1 capacitor (0603) MAX2470/MAX2471 Evaluation Kits 3) For a differential power-gain measurement, connect Quick Start a balun between the outputs of the buffer and the The MAX2470/MAX2471 EV kits are fully assembled spectrum analyzer. and factory tested. Follow the instructions in the Connections and Setup section for proper device eval- Analysis uation. Adjust the frequency span, center frequency, and amplitude of the spectrum analyzer to observe the sig- Test Equipment Required nal peak at 200MHz the output signal power should This section lists the recommended test equipment to read approximately -6dBm for the MAX2470 and verify the operation of the MAX2470/MAX2471. It is -5dBm for the MAX2471. intended as a guide only, and some substitutions are possible. Detailed Description One DC power supply capable of supplying a mini- This section describes the circuitry surrounding the IC mum of 10mA at +2.7V to +5.5V. in the MAX2470/MAX2471 EV kits. For more detailed information about the device operation, please consult One RF spectrum analyzer capable of making mea- the MAX2470/MAX2471 data sheet. surements over the bandwidth of the MAX2470/ MAX2471 and a few harmonics, such as the HP Figure 1 is the schematic for the MAX2470/MAX2471 EV 8561E. kits. Capacitors C1, C2, C3, and C4 are 2200pF DC- blocking capacitors this value contributes minimal reac- One RF signal generator capable of delivering 0dBm tance to the signal paths, down to 10MHz. Capacitors C5 output power at 500MHz, such as the HP 8648C sig- and C6 form the V decoupling network. Note the CC nal generator. location of each component a relatively large 10F tan- Two baluns with a 2:1 turns ratio and an operating talum capacitor, C6, is located near the V connector. CC range encompassing 10MHz to 500MHz, such as the Near to C6, a much smaller 2200pF decoupling capaci- Macom model number 96341 180 hybrid (balun). tor, C5, reduces any high-frequency interference. Fully differential measurements for the MAX2470 The EV kit includes pads for R3 and R4 that can facili- require a single 180 hybrid at the output. Fully differ- tate simple termination of the input(s). For the MAX2470 ential measurements for the MAX2471 require two EV kit, R2 and C7 provide high-frequency filtering to 180 hybrids: one at the input, and one at the output. prevent excess noise from coupling into the IC. Connections and Setup On the MAX2470 EV kit, jumper JU1 selects the state of 1) Verify the DC power supply is set to less than +5.5V the HI/LO input on the MAX2470. Selecting the LO and is off before connecting the supply to the EV kit. setting optimizes the MAX2470 for input frequencies A good starting point is +3.0V. Connect the power from 10MHz to 200MHz. Selecting the HI setting opti- supply between V and GND and turn it on. CC mizes the MAX2470 for input frequencies from 10MHz 2) Set the output power of the signal generator to to 500MHz. -20dBm at 200MHz. Disable the output, then con- nect the output of the signal generator to the IN SMA connector of the MAX2470 EV kit board. For the MAX2471, use a balun between the signal generator and the differential inputs (IN and IN). 2 Evaluate: MAX2470/MAX2471