Evaluate: MAX2680/MAX2681/MAX2682 19-4786 Rev 1 11/98 MAX2680/MAX2681/MAX2682 Evaluation Kits General Description Features The MAX2680/MAX2681/MAX2682 evaluation kits (EV Easy Evaluation of MAX2680/MAX2681/MAX2682 kits) simplify the evaluation of the MAX2680/ MAX2681/MAX2682 downconverter mixers. They Easy Evaluation of All Device Functions enable testing of all device functions and require no +2.7V to +5.5V Single-Supply Operation additional support circuitry. Signal inputs and outputs use SMA connectors to ease the connection of RF test RF Input Matched to 50 at 900MHz equipment. IF Output Matched to 50 at 70MHz All three EV kits share the same PC board but have RF input matching components optimized for each device SMA Input and Output Signal Connectors at an RF frequency of 900MHz. Be sure to select the EV kit for the device that meets your performance needs. All Critical Peripheral Components Included Consult the Selector Guide in the MAX2680/ MAX2681/MAX2682 data sheet for the various combi- nations of power gain, input IP3, noise figure, and sup- ply current offered by each device. The IF output Components Common matching components are optimized for an IF frequen- to All Three EV Kits cy of 70MHz. All matching components may be changed to match RF frequencies from 400MHz to DESIGNATION QTY DESCRIPTION 2.5GHz and IF frequencies from 10MHz to 500MHz. Consult Tables 2 and 4 in the MAX2680/MAX2681/ C1 1 270pF ceramic capacitor (0603) MAX2682 data sheet for component values appropriate C2 1 15pF ceramic capacitor (0603) for each device at other RF and IF operating frequen- C3, C4, C6 3 1000pF ceramic capacitors (0603) cies. C5 1 10F, 10V tantalum capacitor (0805) C7, C8 2 Open 330nH inductor L1 1 Coilcraft 1008HS-330TJBC Ordering Information R1 0 Open R2 0 Not installed, short TEMP. SOT PART IC PACKAGE RANGE TOP MARK IF, LO, RF 3 SMA connectors (edge mount) JU1 1 3-pin header MAX2680EVKIT -40C to +85C 6 SOT23-6 AAAR MAX2681EVKIT -40C to +85C 6 SOT23-6 AAAS GND, V , CC 3 Eyelets SHDN MAX2682EVKIT -40C to +85C 6 SOT23-6 AAAT None 1 MAX2680/MAX2681/MAX2682 PC board MAX2680 EV Kit Additional Components Component Suppliers SUPPLIER PHONE FAX DESIGNATION QTY DESCRIPTION Z1 1 270pF ceramic capacitor (0603) AVX 803-946-0690 803-626-3123 Coilcraft 847-639-6400 847-639-1469 22nH inductor Z2 1 Toko LL1608-FH22NJ Toko America 708-297-0070 708-699-1194 Z3 0 Open U1 1 MAX2680EUT-T (6-pin SOT23) Maxim Integrated Products 1 For free samples & the latest literature: MAX2680/MAX2681/MAX2682 Evaluation Kits MAX2681 EV Kit MAX2682 EV Kit Additional Components Additional Components DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Z1 1 270pF ceramic capacitor (0603) Z1 1 1.5pF ceramic capacitor (0603) Z2 1 270pF ceramic capacitor (0603) 18nH inductor Z2 1 Toko LL1608-FHI8NJ 10nH inductor Z3 1 Toko LL1608-FH10NJ Z3 0 Open U1 1 MAX2681EUT-T (6-pin SOT23) U1 1 MAX2682EUT-T (6-pin SOT23) quency to 970MHz and output power level to Quick Start -5dBm. The MAX2680/MAX2681/MAX2682 EV kits are fully assembled and factory tested. Follow the instructions in 5) Use a third 50 SMA cable to connect the IF con- the Connections and Setup section for proper device nector of the EV kit to the spectrum analyzer. Take evaluation. care to use quality connector adapters for the spectrum analyzers input. Avoid the use of BNC- Test Equipment Required type connectors due to their high VSWR while oper- This section lists the recommended test equipment to ating in the GHz range. verify the operation of the MAX2680/MAX2681/ MAX2682. It is intended as a guide only, and some Analysis substitutions are possible. 1) Set the spectrum analyzers center frequency to 70MHz, with a frequency span of 1MHz. DC power supply capable of supplying a minimum of 50mA at +2.7V to +5.5V 2) Set the spectrum analyzers marker to read the HP8561E spectrum analyzer or equivalent high- peak power level of the center frequency. For the sensitivity spectrum analyzer MAX2680 the IF power level is nominally -13.4dBm. The IF output power is equal to the RF input power Digital multimeter (DMM) to monitor DC supply volt- plus the conversion gain of the downconverter age and supply current (if desired) mixer. The MAX2680 has a typical conversion gain Two HP8648C RF signal generators or equivalent of 11.6dB. The MAX2681 has a typical conversion (50) sine-wave sources for the RF and LO inputs gain of 14.2dB. The MAX2682 has a typical conver- Three 50 SMA cables (RG-58A/U or equivalent) sion gain of 14.7dB. Connections and Setup Detailed Description 1) Verify the DC power supply is set to less than +5.5V and is off before connecting the supply to the EV This section describes the circuitry surrounding the kit. A good starting point is +3.0V. Connect the MAX2680/MAX2681/MAX2682 EV kits. For more power supply between V and GND, and turn the detailed information covering device operation, please CC consult the MAX2680/MAX2681/MAX2682 data sheet. power supply on. Figure 1 is the schematic for the MAX2680/MAX2681/ 2) Verify the jumper JU1 is in the on position, pin 1 MAX2682 EV kits. The RF input matching components shorted to pin 2 (SHDN = V ). CC Z1, Z2, and Z3 are optimized for each device and for 3) Use a 50 SMA cable to connect a signal genera- an RF frequency of 900MHz. A DC-blocking capacitor tor to the SMA RF connector of the EV kit. Set the is required on the RF port. The IF output matching com- signal generators output frequency to 900MHz and ponents, L1 and C2, are optimized for an IF frequency output power level to -25dBm. of 70MHz and are independent of the device chosen. 4) Use another 50 SMA cable to connect a second Consult Tables 2 and 4 in the MAX2680/MAX2681/ signal generator to the SMA LO connector of the EV MAX2682 data sheet for components appropriate for kit. Set the second signal generators output fre- each device at other RF and IF frequencies. Capacitor 2 Evaluate: MAX2680/MAX2681/MAX2682