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19-1759; Rev 0; 7/00
MAX2645 Evaluation Kit
General Description
The MAX2645 evaluation kit (EV kit) simplifies evaluation of the MAX2645 3.4GHz to 3.8GHz low-noise amplifier/PA predriver. The EV kit is fully assembled and tested, allowing simple evaluation of all device functions. All RF signal ports use SMA connectors, providing a convenient interface to RF test equipment. The MAX2645 is a versatile, high-performance, lownoise amplifier with adjustable IP3. These features allow the MAX2645 to be used in a variety of applications, from a low-noise amplifier to a PA predriver. As assembled, the MAX2645 EV kit is configured for lowest noise figure performance (NF = 2.3dB, IIP3 = +4dBm). A few minor component changes configure the device as a low-noise amplifier with higher linearity and slightly degraded noise figure performance (NF = 2.6dB, IIP3 = +10dBm) or as a PA predriver with high output P1dB performance (output P1dB = +12dBm). Refer to the MAX2645 data sheet for application-specific performance data. o Easy Evaluation of the MAX2645 o All Critical Peripheral Components Included o SMA Input and Output Connectors o RF Ports Matched to 50 at 3.55GHz o Fully Assembled and Tested
Features
Evaluates: MAX2645
Ordering Information
PART MAX2645EVKIT *Exposed paddle TEMP. RANGE -40C to +85C IC PACKAGE 10 MAX-EP*
Component Suppliers
SUPPLIER AVX EFJohnson Kamaya Murata Taiyo Yuden Toko PHONE FAX WEB Avxcorp.com 843-448-9411 843-448-1943
402-474-4800 402-474-4858 Efjohnson.com 219-489-1533 219-489-2261 Kamaya.com 800-831-9172 814-238-0490 800-348-2496 847-925-0899 800-PIK-TOKO 708-699-1194 Murata.com T-Yuden.com Tokoam.com
Component List
DESIGNATION QTY C1 C2 C3 C4 C5, C6, C8 C7 C9 Z1 1 1 1 1 3 1 1 1 DESCRIPTION 1.5pF 0.1pF ceramic capacitor (0402) Murata GRM36COG1R5B050 220pF 10% ceramic capacitor (0402) Murata GRM36X7R221K050 47pF 5% ceramic capacitor (0402) Murata GRM36COG470J050 0.75pF 0.1pF ceramic capacitor (0402) Murata GRM36COGR75B050 0.1F 10% ceramic capacitors (0603) Murata GRM39X7R104K016 10F, 16V tantalum capacitor AVX TAJC106K016 1000pF 10% ceramic capacitor (0402) Murata GRM36X7R102K050 1.8nH inductor Toko LL1005-FH1N8S DESIGNATION QTY R1 R2, R3 JU1, JU2 None J1, J2 J3, J4 U1 None None None 1 2 2 2 2 2 1 1 1 1 DESCRIPTION 20k 1% resistor (0603) 1k 5% resistors (0603) 3-pin headers Shunts (JU1, JU2) Test points (VCC, GND) SMA connectors (edge mount) EFJohnson 142-0701-801 MAX2645EUB MAX2645 PC board (GETek) MAX2645 data sheet MAX2645 EV kit data sheet
________________________________________________________________ Maxim Integrated Products
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MAX2645 Evaluation Kit Evaluates: MAX2645
Test Equipment Required
This section lists the test equipment required for evaluating the MAX2645: * One DC power supply capable of supplying 20mA of supply current over the supply voltage range +3.0V to +5.5V One RF-signal generator or equivalent (50) sinewave source capable of delivering at least -10dBm of output power up to 3.8GHz (HP 8648, for example) One RF-spectrum analyzer or equivalent with a frequency range of at least 4GHz (HP 8561E, for example) Two 50 SMA cables (RG-58A/U or equivalent) Optional: Digital multimeters (DMMs) to monitor DC supply voltage and supply current * Optional: Power meter for calibrating system measurements (HP 438A for example)
Connections and Setup
This section provides step-by-step instructions for setting up the EV kit and ensuring proper operation: 1) DC Power Supply: Set the DC power supply voltage to +3.3V. Turn the power supply off and connect it to the VCC and GND connections on the EV kit. If desired, place an ammeter in series with the power supply to measure supply current and a voltmeter in parallel with the VCC and GND connections to measure supply voltage at the device. 2) RF Signal Generator: Connect one of the 50 SMA cables to the RF output of the signal generator. Set the RF frequency of the signal generator to 3.55GHz at an output power level of -20dBm. To improve measurement accuracy, use a power
*
*
* *
1
GND
VCC
C3 47pF R3 1k C8 0.1F
C6 0.1F VCC 1 GAIN 0 JU1
VCC C10 10F
2
GND
GAIN
9
MAX2645 RFIN C1 3 RFIN SHDN 8
R2 1k C8 0.1F
1 SHDN 0 JU2
Z1
4
GND
GND
7 RADIAL STUB* 40 294 TLINE mil s LEQUIV = 1.5nH
5 C2 220pF R1
BIAS
RFOUT
8
VCC C9 1000pF RFOUT
C4 0.75pF
APPLICATION CIRCUIT LNA, LOW NF LNA, HIGH INPUT IP3 PA PREDRIVER
C1 1.5pF 1000pF 0.01F
Z1 1.8nH 0.75pF 0.75pF
RBIAS (k) VCC (V) 20 3.3 20 15 3.3 5.0
*BOARD MATERIAL = GETek, COPPER THICKNESS = 1 oz
BOARD THICKNESS = 0.012in, DIELECTRIC CONSTANT = 3.8
Figure 1. MAX2645 EV Kit Schematic 2 _______________________________________________________________________________________
MAX2645 Evaluation Kit
meter to measure the actual power at the end of the SMA connector. Turn the output of the signal generator off once the output power has been set. Connect the other end of the SMA cable to the RFIN port of the MAX2645 EV kit. 3) Spectrum Analyzer: Connect the spectrum analyzer to the RFOUT port of the MAX2645 EV kit using a 50 SMA cable. Set the center frequency of the spectrum analyzer to 3.55GHz, the frequency span to 1MHz, and the reference level to 0dBm. To improve measurement accuracy, calibrate out any cable losses and spectrum analyzer offsets. 4) Jumper Connections: To enable the MAX2645, connect the SHDN jumper (JU2) on the EV kit to the "1" position (SHDN = VCC). To place the MAX2645 in high-gain mode, connect the GAIN jumper (JU1) on the EV kit to the "1" position (GAIN = VCC). To evaluate the MAX2645 low-power shutdown mode, connect the SHDN jumper (JU2) on the EV kit to the "0" position (SHDN = GND). The ammeter should read approximately 0.1A. To evaluate the MAX2645 as a low-noise amplifier with higher linearity performance or as a PA predriver, replace capacitor C1, Z1, and resistor R1 with the components recommended in the EV kit schematic (Figure 1). Refer to the MAX2645 data sheet for applicationspecific performance data.
Evaluates: MAX2645
Layout and Bypassing
The MAX2645 RFOUT output port requires an equivalent 1.5nH of high-impedance transmission line to VCC for proper biasing and matching. This transmission line is terminated at the VCC node with a radial stub for high-frequency bypassing. This arrangement provides a high-Q, low-loss bias network used to optimize performance. The radial stub can be replaced with an appropriate microwave capacitor. Good PC board layout is an essential aspect of RF circuit design. The MAX2645 EV board can serve as a guide for layout of your board. Keep PC board trace lengths as short as possible to minimize parasitics and losses. Keep bypass capacitors as close to the device as possible with low-inductance connections to the ground plane. Refer to the MAX2645 data sheet for more information regarding bypassing.
Analysis
Turn on the power supply, then the RF signal generator. The ammeter should read approximately 9.2mA, and the spectrum analyzer should show an output power of approximately -6dBm in high-gain mode. Be sure to take into account cable and board losses when calculating power gain. Typical board losses are 0.5dB at 3.5GHz. To evaluate the MAX2645 in low-gain mode, connect the GAIN jumper (JU1) on the EV kit to the "0" position (GAIN = GND). The ammeter should read approximately 3mA, and the spectrum analyzer should show an output power of approximately -31dBm in low-gain mode.
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Figure 2. MAX2645 EV Kit PC Board Layout--Component Placement Guide
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Figure 3. MAX2645 EV Kit PC Board Layout--Component Side
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MAX2645 Evaluation Kit Evaluates: MAX2645
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Figure 4. MAX2645 EV Kit PC Board Layout--Ground Plane
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Figure 5. MAX2645 EV Kit PC Board Layout--Power Plane
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Figure 6. MAX2645 EV Kit PC Board Layout--Solder Side
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) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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