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MAX2043 Datasheet(PDF) 2 Page - Maxim Integrated Products |
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MAX2043 Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 7 page MAX2043 Evaluation Kit 2 _______________________________________________________________________________________ Quick Start The MAX2043 EV kit is fully assembled and factory test- ed. Follow the instructions in the Connections and Setup section for proper device evaluation. Test Equipment Required This section lists the recommended test equipment to verify the operation of the MAX2043. It is intended as a guide only, and substitutions may be possible: • DC supply capable of delivering +5.0V and 175mA • Three RF signal generators capable of delivering 10dBm of output power in the 1GHz to 3GHz frequency range (i.e., HP 8648) • RF spectrum analyzer with a minimum 100kHz to 3GHz frequency range (HP 8561E) • RF power meter (HP 437B) • Power sensor (HP 8482A) Connections and Setup This section provides a step-by-step guide to testing the basic functionality of the EV kit. As a general pre- caution to prevent damaging the outputs by driving high-VSWR loads, do not turn on DC power or RF signal generators until all connections are made. This procedure is specific to operation in the US PCS band (reverse channel: 1850MHz to 1910MHz), high- side injected LO for a 200MHz IF. Choose the test fre- quency based on the particular system’s frequency plan, and adjust the following procedure accordingly. See Figure 1 for the mixer test setup diagram: 1) Calibrate the power meter for 2100MHz. For safety margin, use a power sensor rated to at least +20dBm, or use padding to protect the power head as necessary. 2) Connect 3dB pads to DUT ends of each of the two RF signal generators’ SMA cables. This padding improves VSWR and reduces the errors due to mis- match. 3) Use the power meter to set the RF signal generators according to the following: • RF signal source: 0dBm into DUT at 1900MHz (this will be about +3dBm before the 3dB pad). • LO1 signal source: 0dBm into DUT at 2100MHz (this will be about +3dBm before the 3dB pad). • LO2 signal source: 0dBm into DUT at 2101MHz (this will be about +3dBm before the 3dB pad). 4) Disable the signal generator outputs. 5) Connect the RF source (with pad) to the RF port. 6) Connect the LO1 and LO2 signal sources to the EV kit’s LO1 and LO2 inputs, respectively. 7) Measure the loss in the 3dB pad and cable that will be connected to the IF port. Losses are frequency dependent, so test this at 200MHz (the IF frequency). Use this loss as an offset in all output power/gain cal- culations. 8) Connect this 3dB pad to the EV kit’s IF port connec- tor and connect a cable from the pad to the spec- trum analyzer. 9) Set the DC supply to +5.0V, and set a current limit of around 175mA if possible. Disable the output voltage and connect the supply to the EV kit (through an ammeter, if desired). Enable the sup- ply. Readjust the supply to get +5.0V at the EV kit. There will be a voltage drop across the ammeter when the mixer is drawing current. 10) Select LO2 by connecting LOSEL (TP3) to GND. 11) Enable the LO and the RF sources. Testing the Mixer Adjust the center and span of the spectrum analyzer to observe the IF output tone at 201MHz. The level should be about -10.5dBm (7.5dB conversion loss, 3dB pad loss). The spectrum analyzer’s absolute magnitude accuracy is typically no better than ±1dB. Use the power meter to get an accurate output power measurement. Disconnect the GND connection to LOSEL. It will be pulled high by a pullup resistor on the board to select LO1. Observe that the 200MHz signal increases while the 201MHz decreases. Reconfigure the test setup using a combiner or hybrid to sum the two LO inputs to do a two-tone IP3 measure- ment if desired. Terminate the unused LO input in 50 Ω. Component List (continued) DESIGNATION QTY DESCRIPTION U1 1 Active dual-mixer IC (6mm x 6mm, 36-pin TQFN with exposed paddle) Maxim MAX2043ETX+ NOTE: U1 HAS AN EXPOSED PADDLE CONDUCTOR THAT REQUIRES IT TO BE SOLDER ATTACHED TO A GROUNDED PAD ON THE CIRCUIT BOARD TO ENSURE A PROPER ELECTRICAL/THERMAL DESIGN. + Denotes lead-free package. |
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