|Company||Maxim Integrated Products|
|Datasheet||Download MAX2471EVKIT datasheet
The MAX2470/MAX2471 evaluation kits (EV kits) simplify the evaluation of the MAX2470/MAX2471 VCO buffer amplifiers. They enable testing of the devices' performance and require no additional support circuitry. All inputs and outputs use SMA connectors to facilitate easy connection of RF test equipment. The MAX2470 EV kit is assembled with the MAX2470 and provides one high-impedance input (with pads to terminate to 50) and a pair of matched 50 differential outputs. JU1 sets the logic level at the HI/LO bias-control input, allowing for selection between to 500MHz and to 200MHz operation. The MAX2471 EV kit is assembled with the MAX2471 and provides two highimpedance inputs (with pads to terminate to 50) and a pair of matched 50 differential outputs.
DESIGNATION QTY J5, J6 None DESCRIPTION 10%, 25V ceramic-chip capacitors 10%, 10V tantalum capacitor AVX TAJC106K016 Optional 50 input-termination resistors (0603) (not installed) SMA connectors (PC top mount) E.F. Johnson 142-0701-216 Test points Mouser MAX2470/2471EVKIT PC board MAX2470/MAX2471 EV kit manualFeatures
o Easy Evaluation to +5.5V Single-Supply Operation o On-Board Input-Frequency Range Selection (MAX2470) o Single-Ended (MAX2470) or Differential (MAX2471) Inputs o All Critical Peripheral Components Included
DESIGNATION QTY C7 JU1 DESCRIPTION 10%, 25V ceramic-chip capacitor (0603) 3-pin header (0.100" centers) Digi-key S1012-36-ND Shunt (jumper) Digi-key 0, 5% chip resistor 1k, 5% chip resistor (0603) MAX2470EUTPART MAX2470EVKIT MAX2471EVKIT TEMP. RANGE +85°C IC PACKAGE SOT23-6 SOT TOP MARK AAAX AAAY
DESIGNATION QTY U1 1 DESCRIPTION 10%, 25V ceramic-chip capacitor (0603) SMA connector (PC top mount) E.F. Johnson 142-0701-216 MAX2471EUT
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
The MAX2470/MAX2471 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. 3) For a differential power-gain measurement, connect a balun between the outputs of the buffer and the spectrum analyzer.
Adjust the frequency span, center frequency, and amplitude of the spectrum analyzer to observe the signal peak at 200MHz; the output signal power should read approximately -6dBm for the MAX2470 and -5dBm for the MAX2471.
This section lists the recommended test equipment to verify the operation of the It is intended as a guide only, and some substitutions are possible. One DC power supply capable of supplying a minimum to +5.5V. One RF spectrum analyzer capable of making measurements over the bandwidth of the MAX2470/ MAX2471 and a few harmonics, such as the HP 8561E. One RF signal generator capable of delivering 0dBm output power at 500MHz, such as the HP 8648C signal generator. Two baluns with a 2:1 turns ratio and an operating range encompassing to 500MHz, such as the Macom model number 96341 180° hybrid (balun). Fully differential measurements for the MAX2470 require a single 180° hybrid at the output. Fully differential measurements for the MAX2471 require two 180° hybrids: one at the input, and one at the output.
This section describes the circuitry surrounding the IC in the MAX2470/MAX2471 EV kits. For more detailed information about the device operation, please consult the MAX2470/MAX2471 data sheet. Figure 1 is the schematic for the MAX2470/MAX2471 EV kits. Capacitors C2, C3, and C4 are 2200pF DCblocking capacitors; this value contributes minimal reactance to the signal paths, down to 10MHz. Capacitors C5 and C6 form the VCC decoupling network. Note the location of each component; a relatively large 10µF tantalum capacitor, C6, is located near the VCC connector. Near C6, a much smaller 2200pF decoupling capacitor, C5, reduces any high-frequency interference. The EV kit includes pads for R3 and R4 that can facilitate simple termination of the input(s). For the MAX2470 EV kit, R2 and C7 provide high-frequency filtering to prevent excess noise from coupling into the IC. On the MAX2470 EV kit, jumper JU1 selects the state of the HI/LO input on the MAX2470. Selecting the "LO" setting optimizes the MAX2470 for input frequencies from to 200MHz. Selecting the "HI" setting optimizes the MAX2470 for input frequencies from to 500MHz.
1) Verify the DC power supply is set to less than +5.5V and is off before connecting the supply to the EV kit. A good starting point is +3.0V. Connect the power supply between VCC and GND and turn it on. 2) Set the output power of the signal generator at 200MHz. Disable the output, then connect 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).
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