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19-3459; Rev 0; 10/04
MAX3537/MAX3538 Evaluation Kits
General Description
The MAX3537/MAX3538 evaluation kits (EV kits) simplify the testing and evaluation of the MAX3537/MAX3538 broadband variable-gain amplifiers. The evaluation kits are fully assembled and tested at the factory. Standard 50 SMA connectors are included on the EV kits for the inputs and outputs to allow quick and easy evaluation on the test bench. This document provides a list of equipment required to evaluate the devices, a straightforward test procedure to verify functionality, a description of the EV kit circuits, the circuit schematics, a bill of materials (BOM) for the kits, and artwork for each layer of the PC board. 22dB Gain-Control Range Low Noise Figure: 5dB at Maximum Gain Setting High Linearity: +19dBm IIP3 (MAX3538) at Maximum Gain Setting 50 SMA Connectors with On-Chip Minimum Loss Pads for Easy Evaluation with 50 Test Equipment Fully Assembled and Tested
Features
Low-Noise VGA Eliminates PIN Attenuator
Evaluate: MAX3537/MAX3538
Ordering Information
PART MAX3537EVKIT MAX3538EVKIT TEMP RANGE 0C to +85C 0C to +85C IC PACKAGE 12 Thin QFN-EP* 12 Thin QFN-EP*
*EP = Exposed paddle.
Component List
DESIGNATION C1, C5, C6, C11, C13, C14, C15 C2 C3, C4 C7, C8 C9 C10 C12 C16 L1, L2 L3 QTY 7 1 2 2 1 1 1 1 2 1 DESCRIPTION 1000pF 10% ceramic capacitors (0603) Murata GRM18871H102K 10pF 5% ceramic capacitor (0603) Murata GRM1885C1H100J 6.8pF 10% ceramic capacitors (0603) Murata GRM1885C1H6R8DZ Not installed 100nF 10% ceramic capacitor (0603) Murata GRM18871H104K 47pF 5% ceramic capacitor (0603) Murata GRM1885C1H470J 10F 10% tantalum capacitor AVX TAJC106K016 4.7pF 10% ceramic capacitor (0603) Murata GRM1885C1H6R8DZ 56nH 5% inductors (0603) Murata LQG18HN56NJ00 22nH 2% inductor (0603) Murata LQW18AN22NG00 MAX3537: Not installed MAX3538: 560nH 5% inductor (0805) Coilcraft 0805CS-561XJB DESIGNATION L5 R1, R7 R2, R8 R3 R4, R5 R6 R9, R10, R11 R12 J2, J8 J3, J4, J9, J10 J5, J6, J7 TP1 U1 QTY 1 2 2 1 2 1 3 1 2 4 3 1 1 DESCRIPTION 8.2nH 0.5nH inductor (0603) Murata LQW18AN8N2D00D 43 5% resistors (0603) 86.6 1% resistors (0603) MAX3537: 11.8k 1% resistor (0603) MAX3538: 9.1k 1% resistor (0603) 1M 5% resistors (0603) 20k 5% resistor (0603) 0 5% resistors (0603) Not installed RF top-mount SMA connectors Johnson 142-0701-201 1 x 2, 2-pin headers Sullins PTC36SAAN Red test points 0.40 Keystone 5000 Not installed MAX3537UTC or MAX3538UTC
L4
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________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
Quick Start
The MAX3537/MAX3538 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. 4) Set the spectrum analyzer to an 878MHz center frequency and a 10MHz span. Set the reference level of the spectrum analyzer to 0dBm. Connect the spectrum analyzer to RFOUT on the EV kit. 5) Leave SEL_UHF floating to select the UHF input. The MAX3537/MAX3538 EV kits have a 1M pullup resistor from SEL_UHF to VCC. 6) Enable the DC power supplies and the RF signal generator. An 878MHz tone will be displayed on the spectrum analyzer. 7) When measuring gain, be sure to account for the loss introduced by the minimum loss pads at the input and output of the device (approximately 5.7dB per pad, 11.4dB total). The minimum loss pads provide a broadband match from 75 to 50 and are included to allow for evaluation of the MAX3537/MAX3538 with 50 test equipment. 8) Adjust the RFAGC voltage from 3V to 1V. The output signal power decreases by approximately 22dB. 9) (Optional) Another method for determining gain is by using a network analyzer. This has the advantage of displaying gain over a swept frequency band or input power. Refer to the network analyzer manufacturer's user manual for setup details.
Test Equipment Required
* * * * * * A +4.75V to +5.25V power supply that can source 500mA A 0 to +3V adjustable DC supply that can source 1mA for the AGC input An RF signal generator capable of delivering +13dBm of output power at frequencies up to 1GHz A spectrum analyzer capable of covering the operating frequency range of the device (Optional) A network analyzer to measure gain and return loss (Optional) An ammeter to measure supply current
Connections and Setup
This section provides a step-by-step guide to testing the basic functionality of the EV kits. Do not turn on DC power or RF signal generators until all connections are completed: 1) With its output disabled, set the DC power supply to 5V. Connect the power supply to the VCC (through an ammeter if desired) and GND terminals on the EV kit. If available, set the current limit to 75mA. 2) With its output disabled, set the adjustable DC power supply to 3V. Connect the adjustable power supply to the RFAGC and GND terminals on the EV kit. If available, set the current limit to 1mA. 3) Set the RF signal generator to an 878MHz frequency and a -10dBm output power. Do not turn on the generator's output. Connect the signal generator to RFIN on the EV kit.
Layout Considerations
The MAX3537/MAX3538 evaluation board can serve as a reference board layout. Keep traces carrying RF signals as short as possible to minimize radiation and insertion loss. Place supply decoupling capacitors as close to the device as possible. Solder the package's exposed paddle evenly to the board ground plane for a low-inductance ground connection and for improved thermal dissipation.
Component Suppliers
SUPPLIER AVX Coilcraft Murata PHONE 803-946-0690 847-639-6400 770-436-1300 FAX 803-626-3123 847-639-1469 770-436-3030 WEBSITE www.avxcorp.com www.coilcraft.com www.murata.com
Note: Indicate that you are using the MAX3537/MAX3538 when contacting these component suppliers.
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
C5 1000pF
L2 56nH
L1 56nH C16 4.7pF C2 10pF 1 UH_FIN 12 C1 1000pF C11 1000pF LNAOUT 9 L4* 560nH VCC 8 C10 47pF 7 VCC C14 1000pF R6 20k C9 100nF R5 1M R10 0 C8 OPEN R4 1M 11 10 R7 43 LNA OUT R8 86.6
RF_GND2
VH_FIN
R1 43 VHF/UHF_IN R2 86.6 L3 22nH
L5 8.2nH
C15 1000pF 2 C6 1000pF CAP
GND
U1
VCC
MAX3537/MAX3538
EP
R12 OPEN C4 6.8pF C3 6.8pF VCC J9 +5V J10 GND C12 10F C13 1000pF R9 0
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5
R3 11.8k (MAX3537) 9.1k (MAX3538) VCC TP1
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ENABLE
SPST BIAS
SEL_UHF
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J5 RFAGC
RFAGC
J6 ENABLE J4
R11 0 C7 OPEN
J7 SEL_UHF J3
*MAX3538 ONLY
Figure 1. MAX3537/MAX3538 EV Kit Schematic
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
1.0"
Figure 2. MAX3537/MAX3538 EV Kit Component Placement Guide--Component Side
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
1.0"
Figure 3. MAX3537/MAX3538 EV Kit PC Board Layout--Component Side
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
1.0"
Figure 4. MAX3537/MAX3538 EV Kit PC Board Layout--Inner Layer 2
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
1.0"
Figure 5. MAX3537/MAX3538 EV Kit PC Board Layout--Inner Layer 3
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MAX3537/MAX3538 Evaluation Kits Evaluate: MAX3537/MAX3538
1.0"
Figure 6. MAX3537/MAX3538 EV Kit PC Board Layout--Secondary Component
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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