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19-4786; Rev 1; 11/98
MAX2680/MAX2681/MAX2682 Evaluation Kits
General Description
The MAX2680/MAX2681/MAX2682 evaluation kits (EV kits) simplify the evaluation of the MAX2680/ MAX2681/MAX2682 downconverter mixers. They enable testing of all device functions and require no additional support circuitry. Signal inputs and outputs use SMA connectors to ease the connection of RF test equipment. All three EV kits share the same PC board but have RF input matching components optimized for each device at an RF frequency of 900MHz. Be sure to select the EV kit for the device that meets your performance needs. Consult the Selector Guide in the MAX2680/ MAX2681/MAX2682 data sheet for the various combinations of power gain, input IP3, noise figure, and supply current offered by each device. The IF output matching components are optimized for an IF frequency of 70MHz. All matching components may be changed to match RF frequencies from 400MHz to 2.5GHz and IF frequencies from 10MHz to 500MHz. Consult Tables 2 and 4 in the MAX2680/MAX2681/ MAX2682 data sheet for component values appropriate for each device at other RF and IF operating frequencies.
Features
o Easy Evaluation of MAX2680/MAX2681/MAX2682 o Easy Evaluation of All Device Functions o +2.7V to +5.5V Single-Supply Operation o RF Input Matched to 50 at 900MHz o IF Output Matched to 50 at 70MHz o SMA Input and Output Signal Connectors o All Critical Peripheral Components Included
Evaluate: MAX2680/MAX2681/MAX2682
Components Common to All Three EV Kits
DESIGNATION QTY C1 C2 C3, C4, C6 C5 C7, C8 L1 1 1 3 1 2 1 0 0 3 1 3 1 DESCRIPTION 270pF ceramic capacitor (0603) 15pF ceramic capacitor (0603) 1000pF ceramic capacitors (0603) 10F, 10V tantalum capacitor (0805) Open 330nH inductor Coilcraft 1008HS-330TJBC Open Not installed, short SMA connectors (edge mount) 3-pin header Eyelets MAX2680/MAX2681/MAX2682 PC board
Ordering Information
PART TEMP. RANGE IC PACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 SOT TOP MARK AAAR AAAS AAAT
R1 R2 IF, LO, RF JU1 GND, VCC, SHDN None
MAX2680EVKIT -40C to +85C MAX2681EVKIT -40C to +85C MAX2682EVKIT -40C to +85C
Component Suppliers
SUPPLIER AVX Coilcraft Toko America PHONE 803-946-0690 847-639-6400 708-297-0070 FAX 803-626-3123 847-639-1469 708-699-1194 Z1 Z2 Z3 U1 1 1 0 1
MAX2680 EV Kit Additional Components
DESIGNATION QTY DESCRIPTION 270pF ceramic capacitor (0603) 22nH inductor Toko LL1608-FH22NJ Open MAX2680EUT-T (6-pin SOT23)
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MAX2680/MAX2681/MAX2682 Evaluation Kits Evaluate: MAX2680/MAX2681/MAX2682
MAX2681 EV Kit Additional Components
DESIGNATION QTY Z1 Z2 Z3 U1 1 1 0 1 DESCRIPTION 270pF ceramic capacitor (0603) 18nH inductor Toko LL1608-FHI8NJ Open MAX2681EUT-T (6-pin SOT23) Z1 Z2 Z3 U1 1 1 1 1
MAX2682 EV Kit Additional Components
DESIGNATION QTY DESCRIPTION 1.5pF ceramic capacitor (0603) 270pF ceramic capacitor (0603) 10nH inductor Toko LL1608-FH10NJ MAX2682EUT-T (6-pin SOT23)
Quick Start
The MAX2680/MAX2681/MAX2682 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation.
quency to 970MHz and output power level to -5dBm. 5) Use a third 50 SMA cable to connect the IF connector of the EV kit to the spectrum analyzer. Take care to use quality connector adapters for the spectrum analyzer's input. Avoid the use of BNCtype connectors due to their high VSWR while operating in the GHz range.
Test Equipment Required
This section lists the recommended test equipment to verify the operation of the MAX2680/MAX2681/ MAX2682. It is intended as a guide only, and some substitutions are possible. * DC power supply capable of supplying a minimum of 50mA at +2.7V to +5.5V * HP8561E spectrum analyzer or equivalent highsensitivity spectrum analyzer * Digital multimeter (DMM) to monitor DC supply voltage and supply current (if desired) * Two HP8648C RF signal generators or equivalent (50) sine-wave sources for the RF and LO inputs * Three 50 SMA cables (RG-58A/U or equivalent)
Analysis
1) Set the spectrum analyzer's center frequency to 70MHz, with a frequency span of 1MHz. 2) Set the spectrum analyzer's marker to read the peak power level of the center frequency. For the MAX2680 the IF power level is nominally -13.4dBm. The IF output power is equal to the RF input power plus the conversion gain of the downconverter mixer. The MAX2680 has a typical conversion gain of 11.6dB. The MAX2681 has a typical conversion gain of 14.2dB. The MAX2682 has a typical conversion gain of 14.7dB.
Connections and Setup
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 the power supply on. 2) Verify the jumper JU1 is in the "on" position, pin 1 shorted to pin 2 (SHDN = VCC). 3) Use a 50 SMA cable to connect a signal generator to the SMA RF connector of the EV kit. Set the signal generator's output frequency to 900MHz and output power level to -25dBm. 4) Use another 50 SMA cable to connect a second signal generator to the SMA LO connector of the EV kit. Set the second signal generator's output fre2
Detailed Description
This section describes the circuitry surrounding the MAX2680/MAX2681/MAX2682 EV kits. For more detailed information covering device operation, please consult the MAX2680/MAX2681/MAX2682 data sheet. Figure 1 is the schematic for the MAX2680/MAX2681/ MAX2682 EV kits. The RF input matching components Z1, Z2, and Z3 are optimized for each device and for an RF frequency of 900MHz. A DC-blocking capacitor is required on the RF port. The IF output matching components, L1 and C2, are optimized for an IF frequency of 70MHz and are independent of the device chosen. Consult Tables 2 and 4 in the MAX2680/MAX2681/ MAX2682 data sheet for components appropriate for each device at other RF and IF frequencies. Capacitor
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MAX2680/MAX2681/MAX2682 Evaluation Kits
C1 is a DC-blocking capacitor and is required for the LO input port. Pads C7 and C8 are left open on the EV kits, but are provided for experimentation. Pad R1 is left open on the kits, but is provided as an option to resistively terminate the IFOUT port. Capacitors C4, C5, and C6 form the V CC decoupling network. Note the location of each component. C5, a 10F tantalum capacitor, is located near the VCC connector. This serves as the central node for distribution of VCC to the mixer's supply pin and the IFOUT output pull-up inductor L1. Capacitor C6, placed near the VCC connection, and capacitor C4, placed near the device, help to reduce any high-frequency crosstalk. Capacitor C3, placed near the SHDN pin on the device, helps to filter out any noise. For additional filtering, add resistor R2 to the EV kit after cutting the short across the pads for R2.
Modifying the EV Kit
The MAX2680/MAX2681/MAX2682 EV kits are easily used at RF frequencies from 400MHz to 2500MHz, and at IF frequencies from 10MHz to 500MHz. To operate at frequencies other than the factory configuration of 900MHz RF and 70MHz IF, refer to Tables 2 and 4 in the MAX2680/MAX2681/MAX2682 data sheet for the suggested component values. For operation at frequencies other than those given here, consult the graphs RF Port Impedance vs. RF Frequency and IF Port Impedance vs. IF Frequency in the Typical Operating Characteristics in the MAX2680/MAX2681/MAX2682 data sheet and follow typical impedance matching methods.
Evaluate: MAX2680/MAX2681/MAX2682
C3 1000pF C1 270pF 1 LO SHDN 6 C4 1000pF 2 2 GND 3 JU1 1 VCC 5 C6 1000pF SMA IF C2 15pF C7 OPEN C5 10F 10V R2 SHORT
SHDN
SMA LO
GND
U1
MAX2680 MAX2681 MAX2682
VCC
R1 OPEN SMA RF C8 OPEN Z3 Z1 Z2 3 RFIN IFOUT 4
L1 330nH
Figure 1. MAX2680/MAX2681/MAX2682 EV Kits Schematic
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MAX2680/MAX2681/MAX2682 Evaluation Kits Evaluate: MAX2680/MAX2681/MAX2682
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Figure 2. MAX2680/MAX2681/MAX2682 EV Kits PC Board Layout --Component Silkscreen
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Figure 3. MAX2680/MAX2681/MAX2682 EV Kits PC Board Layout --Component Side Metal
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Figure 4. MAX2680/MAX2681/MAX2682 EV Kits 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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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