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| 19-1384; Rev 1; 2/99 MAX2640/MAX2641 Evaluation Kits General Description The MAX2640/MAX2641 evaluation kits (EV kits) simplify the evaluation of the MAX2640/MAX2641 low-noise amplifiers (LNAs). They enable testing of the device's RF performance and require no additional support circuitry. The signal inputs and outputs use SMA connectors to facilitate the connection of RF test equipment. The MAX2640 EV kits are assembled with the MAX2640 and incorporate input and output matching components optimized for an RF frequency of 900MHz. The MAX2641 EV kits are assembled with the MAX2641 and incorporate input and output matching components optimized for an RF frequency of 1900MHz. All matching components may be changed to match RF frequencies from 400MHz to 1500MHz for the MAX2640 and from 1400MHz to 2500MHz for the MAX2641. Consult Tables 1 through 4 in the MAX2640/MAX2641 data sheet for devices S-parameters and noise parameters for the design of matching networks at other frequencies. Features o Easy Evaluation of MAX2640/MAX2641 o +2.7V to +5.5V Single-Supply Operation o RF Input and Output Matched to 50 at 900MHz (MAX2640) o RF Input and Output Matched to 50 at 1900MHz (MAX2641) o All Critical Peripheral Components Included Evaluate: MAX2640/MAX2641 Ordering Information PART TEMP. RANGE IC PACKAGE SOT23-6 SOT23-6 SOT TOP MARK AAAV AAAW MAX2640EVKIT -40C to +85C MAX2641EVKIT -40C to +85C Component Suppliers SUPPLIER Coilcraft Murata Electronics PHONE 847-639-6400 800-831-9172 FAX 847-639-1469 814-238-0490 Component List DESIGNATION MAX2640 MAX2641 QTY EV Kit EV Kit C1, C4 C2 -- C3 ZM1 -- ZM2 C1, C4 -- C2 C3 -- ZM1, ZM2 -- 2 1 1 1 1 2 DESCRIPTION 470pF 5% ceramic caps (0805) Murata GRM40COG471J50V 3pF 0.1pF ceramic cap (0805) Murata GRM40COG3R0B50V 100pF 5% ceramic cap (0805) Murata GRM40COG101J50V 10F ceramic cap (1206) AVX TAJA106K010R U1 2pF 0.1pF ceramic cap (0805) Murata GRM40COG2R0B50V -- 1pF 0.1pF ceramic caps (0603) Murata GRM39COG1R0B50V Not installed None -- U1 -- None 1 1 1 -- 1 DESIGNATION MAX2640 MAX2641 QTY EV Kit EV Kit Z1 -- RFIN, RFOUT -- Z1 RFIN, RFOUT 1 1 DESCRIPTION 9.85nH 5% air-core inductor Coilcraft 1606-9-5 2.55nH 5% air-core inductor Coilcraft 0906-3-5 SMA connectors (PC edge mount) EF Johnson 142-0701-801 MAX2640EUT-T (topmark: AAAV), 6-pin SOT23-6 MAX2641EUT-T (topmark: AAAW), 6-pin SOT23-6 MAX2640 EV kit PC board MAX2641 EV kit PC board 2 ________________________________________________________________ Maxim Integrated Products 1 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. MAX2640/MAX2641 Evaluation Kits Evaluate: MAX2640/MAX2641 Quick Start The MAX2640/MAX2641 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. cal gain of 15.1dB for the MAX2640 and 14.4dB for the MAX2641 after accounting for cable and board losses. Table EV1 lists board losses at specific frequencies. 6) (Optional) Another method for determining gain is using a network analyzer. This has the advantage of displaying gain versus a swept frequency band, in addition to displaying input and output return loss. Refer to the network analyzer manufacturer's user manual for setup details. Test Equipment Required This section lists the recommended test equipment to verify operation of the MAX2640/MAX2641. It is intended as a guide only, and some substitutions are possible. * One RF signal generator capable of delivering at least 0dBm of output power up to 2.5GHz (HP8648C, or equivalent) An RF spectrum analyzer that covers the operating frequency range of the MAX2640/MAX2641 as well as a few harmonics (HP8561E, for example) A power supply capable of up to 100mA at +2.7V to +5.5V An optional ammeter for measuring the supply current Two 50 SMA cables (Optional) A noise figure meter (HP8970B, for example) (Optional) Network analyzer (HP8753D, for example) to measure return loss and gain Checking Noise Figure Noise figure measurements on low-noise devices such as the MAX2640/MAX2641 are extremely sensitive to board and lab setup losses and parasitics. There are many techniques and precautions for measuring a noise figure below 1dB. Detailed explanation of these items goes beyond the scope of this document. For more information on how to perform this level of noise figure measurement, refer to the noise figure meter operating manual as well as the Hewlett Packard application note # 57-2 "Noise Figure Measurement Accuracy." * * * * * * Layout Considerations A good PC board layout is an essential part of an RF circuit design. The EV kit PC board can serve as a guide for laying out a board using the MAX2640/ MAX2641. Generally, each VCC node on the PC board should have its own decoupling capacitor. This minimizes supply coupling from one section of the IC to another. A star topology for the supply layout, in which each VCC node on the circuit has a separate connection to a central VCC node, can further minimize coupling between sections of the circuit board. Connections and Setup Checking Power Gain This section provides a step-by-step guide to operating the EV kits and their function. 1) Connect a DC supply set to +3V (through an ammeter, if desired) to the VCC and GND terminals on the EV kit. 2) Set the generator for an output frequency of 900MHz for the MAX2640 and 1900MHz for the MAX2641 at a power level of -34dBm. Connect one RF signal generator to the RFIN SMA connector. 3) Connect a spectrum analyzer to the RFOUT SMA connector on the EV kit. Set it to a center frequency of 900MHz for the MAX2640 and 1900MHz for the MAX2641, a total span of 200MHz, and a reference level of -10dBm. 4) Turn on the DC supply. The supply current should read approximately 3.5mA for either the MAX2640 or MAX2641 (if using an ammeter). 5) Activate the RF generator's output. A signal on the spectrum analyzer's display should indicate a typi2 Modifying the EV kit The MAX2640 EV kit is factory-configured for operation at 900MHz and is easily configured to operate from 400MHz to 1500MHz. Use device parameters listed in Tables 1 and 3 of the MAX2640/MAX2641 data sheet to determine the proper input and output matching components at other frequencies. To evaluate the MAX2641 at frequencies other than the factory configured 1900MHz, use device parameters listed in Tables 2 and 4 of the MAX2640/MAX2641 data sheet to determine the proper input and output matching components. Table 1 lists recommended matching component values for the MAX2641 at 1575MHz and 2450MHz. The MAX2640/MAX2641 are designed for AC-coupled operation. When determining matching components for other frequencies, ensure that a DC-blocking capacitor is part of the matching network. _______________________________________________________________________________________ MAX2640/MAX2641 Evaluation Kits Table 1. MAX2640/MAX2641 EV Kit Board and Component Losses and Matching Component Values FREQUENCY (MHz) MAX2640 MAX2641 900 -- -- -- -- 1575 1900 2450 C1 VALUE (pF) 470 100 470 470 C2 VALUE (pF) 3 100 100 100 C5 Open Open Open 100pF Z1* VALUE (nH) 9.85 5.6 2.55 1.65 ZMI ZM1 ZM2 ZM2 VALUE POSITION VALUE POSITION (pF) 2 1 1 1 22 9.5 9.5 4 -- 6.8nH 1pF 1pF -- 11.5 25.5 12 INPUT LOSS (dB) 0.25 0.37 0.41 0.56 OUTPUT LOSS (dB) 0.15 0.30 0.30 0.50 Evaluate: MAX2640/MAX2641 *The series inductor can be replaced by a transmission line of appropriate impedance and electrical length. 6.8nH Murata LQP11A6N8C00 (0603) C1 RF IN ZM1 470pF 2pF Z1 9.85nH 1 RFIN U1 MAX2640 VCC 6 C5 OPEN C4 470pF C3 10F VCC 2 GND GND 5 C2 GND 4 3pF 3 GND RFOUT RF OUT Figure 1. MAX2640 EV Kit Schematic C1 RF IN ZM1 470pF 1pF Z1 2.55nH 1 RFIN U1 MAX2641 VCC 6 C5 OPEN C4 470pF C3 10F VCC 2 GND GND 5 C2 GND 3 GND RFOUT 4 100pF ZM2 1pF RF OUT Figure 2. MAX2641 EV Kit Schematic _______________________________________________________________________________________ 3 MAX2640/MAX2641 Evaluation Kits Evaluate: MAX/MAX2640/MAX2641 1.0" Figure 3. MAX2640 EV Kit Component Placement Guide-- Component Side 1.0" Figure 4. MAX2641 EV Kit Component Placement Guide-- Component Side 1.0" Figure 5. MAX2640 EV Kit PC Board Layout--Component Side 1.0" Figure 6. MAX2641 EV Kit PC Board Layout--Component Side 1.0" Figure 7. MAX2640/MAX2641 EV Kit PC Board Layout-- Ground Plane Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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