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19-1881; Rev 0; 12/00
MAX3524 Evaluation Kit
General Description
The MAX3524 evaluation kit (EV kit) enables RF evaluation of the MAX3524 low-noise, high-linearity broadband amplifier and the closed-loop DC gain of the operational amplifier (op amp) without any additional support circuitry. The MAX3524 EV kit is assembled with the MAX3524 and incorporates input and output components that facilitate testing from 44MHz to 880MHz. The EV kit provides 50 SMA connectors for the RF input and output signals. Figure 1 shows the MAX3524 EV kit schematic diagram. For more information about the MAX3524, consult the MAX3524 data sheet. o Easy Evaluation of the MAX3524 o +4.75V to +5.25V Single-Supply Operation o RF Input and Output Matched to 50 o SMA Connectors at RF Signal Ports o 50 to 75 Minimum Loss Pad at the Input
Features
Evaluates: MAX3524
Ordering Information
PART MAX3524EVKIT TEMP RANGE -40C to +85C IC-PACKAGE 10 MAX-EP
Component List
DESIGNATION C1 C2, C14 C3, C19, C20 3 QTY 1 DESCRIPTION 47pF 5% ceramic capacitor (0603) Murata GRM39COG470J050A Not installed 10F, 16V 10% tantalum capacitors AVX TAJC106K016 0.1F 10% ceramic capacitors (0603) Murata GRM39X7R104K016A Diodes Central Semiconductor CMDSH-3 (SOD323) SMA edge mount connectors EF Johnson 142-0701-801 U1 J2, J3, J4, J5, J6, J9, TP1, TP4, TP5 L5 R1 9 Test points None 1 1 680nH inductor Coilcraft 1206CS-681XJBC 43.2 1% resistor (0603) Kamaya RMC16-43R2FT None 1 1 1 DESIGNATION R2 R3, R7 R4 R5, R6, R10, R11 R9 R12 D1, D2 2 T2 1 4 1 1 1 QTY 1 DESCRIPTION 86.6 1% resistor (0603) Kamaya RMC16-86R6FT Not installed 49.9k 1% resistor (0603) Kamaya RMC16-4992FT 3k 5% resistors (0603) Kamaya RMC16-302JB 100 5% resistor (0603) Kamaya RMC16-101JB 6.19 1% resistor (0603) RMC16-6R20FT Balun transformer M/A COM ETC1-1-13 MAX3524EUB, 10-pin MAX-EP NOTE: U1 has an exposed paddle requiring soldering to the circuit board to insure proper function of the part. MAX3524 EV kit data sheet MAX3524 Rev C EV kit circuit board
C10, C11, C12, C13, C15, C16
6
J1, J7
2
________________________________________________________________ Maxim Integrated Products
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For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX3524 Evaluation Kit Evaluates: MAX3524
Quick Start
The MAX3524 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. operation. Adjust power supply output as needed. 5) The network analyzer display should indicate a typical gain of 4.25dB at 44MHz. The MAX3524 EV kit utilizes a 50 to 75 pad. The insertion loss of this pad is approximately 5.7dB. The actual gain of the MAX3524 when driven by a 75 source is: Measured Gain + 5.72dB (The MAX3524 data sheet specifies voltage gain with a 3k load. This typically results in a voltage gain of 15dB.) Checking Noise Figure Noise figure measurements are sensitive to board and lab setup losses and parasitics. There are many techniques and precautions for measuring a low-noise figure. 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 to Hewlett Packard application note #57-2, Noise Figure Measurement Accuracy. The EV kit board consists of a 50 to 75 pad at the input of the amplifier, which introduces a loss of 5.72dB. To obtain the correct noise figure of the MAX3524, subtract 5.72dB from the measured noise figure. Closed-Loop Gain of Op Amp 1) Connect a DC supply preset to +5V (through an ammeter, if desired) to the EV kit's VCC (J9) and GND (J6) terminals. Do not turn on the supply. 2) Connect a second DC supply preset to +2V to the EV kit's terminal J2 and GND (J6) terminals. 3) Turn on the DC supplies. 4) Measure the output of the op amp at TP4 (Test Point 4) using the voltmeter. The voltmeter should display approximately +2V, taking into account the input resistor voltage-divider (1/2 and closed-loop gain +2) of the op amp.
Recommended Test Equipment
One supply capable of providing at least 200mA at +4.75V to +5.25V to bias the RF amplifier and the op amp. The other supply to test the closed-loop gain of the op amp. HP8753D or equivalent for measuring RF power gain. Two 50 cables with SMA connectors. To measure op amp output. For measuring supply current. HP8970B or equivalent for measuring the noise figure of the RF amplifier.
Two Power Supplies or a Dual Voltage Power Supply
Network Analyzer Cables (50) Voltmeter Ammeter (optional)
Noise Figure Meter (optional)
Connections and Setup
This section provides a step-by-step guide to setting up the MAX3524 EV kit and testing the broadband LNA. Do not apply DC power or RF signals until all connections are made. Broadband Low Noise Amplifier Note: The input to the LNA is preceded by a minimum loss pad that transforms the source impedance from 50 to 75. The insertion loss of this is pad is 5.7dB. 1) Connect a DC supply preset to +5V (through an ammeter, if desired) to the EV kit's VCC (J9) and GND (J6) terminals. Do not turn on the supply. 2) Perform a full two-port calibration on a network analyzer at a power level of -25dBm. Refer to the network analyzer's operating manual for detailed instructions. 3) Connect port 1 and port 2 of a network analyzer to the LNAIN SMA connector (J1) and LNAOUT SMA connector (J7), respectively. 4) Turn on the DC supply. The supply current should read approximately 85mA (if using an ammeter). Measure DC voltage between J9 and J6 to ensure 5V
2
PC Board Layout Considerations
The MAX3524 EV kit can serve as a board layout guide. Keep PC board trace lengths as short as possible to minimize parasitics. Long PC board traces at the input and output of the MAX3524 can degrade gain flatness. Keep decoupling capacitors as close to the device as possible, with a low inductance connection to the ground plane.
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MAX3524 Evaluation Kit Evaluates: MAX3524
J2 R5 3k J3 C20 10F OPIN+ VCC2 J4 C3 10F J9 VCC
R6 3k
+
+
C19 10F
J1 SMA R2 86.6 C11 0.1F TP4
R1 43.2 VCC2 R4 49.9k
VCC C1 47pF 1 VCC 2 C10 0.1F
3
RFIN RFGND
PFOUT- 10 VCC VCC 9 OUT+ 8
C16 0.1F C14 OPEN 5 C15 0.1F T2
4
1 2 C2 3 OPEN ECT1-1-13
J7
SMA
R9 100 R10 3k
TP5
C12 0.1F
R3 OPEN
4
MAX3524
OPOUT OPIN+ BIAS
5 7 6
OPIN+ C13 0.1F L5 IN01205 680nH TP1 R12 6.19
OPIN-
J6 GND
D1
J5 OPIND2
R11 3k R7 VCC2 OPEN
Figure 1. MAX3524 EV Kit Schematic
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MAX3524 Evaluation Kit Evaluates: MAX3524
Component Suppliers
SUPPLIER AVX Coilcraft EF Johnson Kamaya M/A COM Murata PHONE 803-946-0690 847-639-6400 402-474-4800 219-489-1533 1-800-366-2266 949-852-2001 FAX 803-626-3123 847-639-1469 402-474-4858 219-489-2261 1-800-618-8883 949-852-2002 WEB ADDRESS www.avxcorp.com www.coilcraft.com www.efjohnson.com www.kamaya.com www.macom.com www.murata.com
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MAX3524 Evaluation Kit Evaluates: MAX3524
1.0"
1.0"
Figure 2. MAX3524 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX3524 EV Kit PC Board Layout--Component Side
1.0"
Figure 4. MAX3524 EV Kit PC Board Layout--Ground 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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