19-0635; Rev 0; 8/06 MAX4003 Evaluation Kit The MAX4003 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX4003 RF detector in an 8-pin MAX(R) package. The MAX4003 EV kit includes an on-board shutdown control as well as quasi-measurement mode circuitry to provide an easy method to evaluate the MAX4000/ MAX4001/MAX4002. The RF input utilizes a 50 SMA connector for convenient connection to test equipment. The MAX4003 EV kit can also be used to evaluate the MAX4000/MAX4001/MAX4002 RF-detecting controllers. Features 2.7V to 5.5V Single-Supply Operation 50 SMA Connector on RF Input On-Board Quasi-Measurement Mode Circuitry On-Board Shutdown Control Fully Assembled and Tested Surface-Mount Board Ordering Information PART TYPE IC PACKAGE MAX4003EVKIT+ EV kit 8 MAX +Denotes a lead-free and RoHS-compliant EV kit. MAX is a registered trademark of Maxim Integrated Products, Inc. Note: To evaluate the MAX4000, MAX4001, or MAX4002, request a MAX4000EUA, MAX4001EUA, or MAX4002EUA free sample with the MAX4003 EV kit. Component List DESIGNATION QTY C1, C3, C5 3 C2 C4 C7, C8 DESCRIPTION 0.1F 20%, 10V X5R ceramic capacitors (0402) TDK C1005X5R1A104M 0 Not installed (0402) 1 2200pF 10%, 50V X7R ceramic capacitor (0402) TDK C1005X7R1H222K 2 100pF 5%, 50V C0G ceramic capacitors (0402) TDK C1005C0G1H101J DESIGNATION QTY DESCRIPTION R2 1 R3, R9 2 52.3 1% resistor (0402) 0 5% resistors (0402) R4 0 Not installed (0402) R5, R6, R8 3 10.0k 1% resistors (0402) R7 1 14.0k 1% resistor (0402) RFIN 1 SMA connector (PC edge-mount) U1 1 MAX4003EUA+ (8-pin MAX) U2 1 MAX4412EXK+ (5-pin SC70) JU1, JU3 2 3-pin headers -- 3 Shunts JU2 1 2-pin header -- 1 MAX4003 EV kit PC board R1 1 100 1% resistor (0402) Component Supplier SUPPLIER TDK PHONE FAX 847-803-6100 847-390-4405 WEBSITE www.component.tdk.com Note: Indicate that you are using the MAX4003 when contacting this component supplier. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX4000-MAX4003 General Description Evaluates: MAX4000-MAX4003 MAX4003 Evaluation Kit Quick Start Detailed Description Recommended Equipment The MAX4003 EV kit is a fully assembled and tested surface-mount circuit board that evaluates the MAX4003 RF detector. The MAX4003 EV kit can also be used to evaluate the MAX4000/MAX4001/MAX4002 RF-detecting controllers. The MAX4003 EV kit includes an on-board shutdown control as well as quasi-measurement mode circuitry to provide an easy method to evaluate the MAX4000/MAX4001/MAX4002. The RF input utilizes a 50 SMA connector for convenient connection to test equipment. * One variable DC power supply capable of supplying between 2.7V and 5.5V at 50mA * One signal generator capable of delivering -45dBm to 0dBm at frequencies between 100MHz and 2.5GHz * One voltmeter Procedure The MAX4003 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Set the variable DC power supply to 3V. 2) Ensure that the variable DC power supply is turned off. 3) Connect the positive terminal of the variable DC power supply to the VCC pad. Connect the ground return of the variable DC power supply to the GND pad. 4) Set the signal generator to produce an output signal of 0dBm at a frequency of 100MHz. 5) Ensure that the signal generator is turned off. 6) Connect the signal generator to the PC edge-mount SMA connector marked RFIN. 7) Connect the positive terminal of the voltmeter to the OUT pad. Connect the ground return of the voltmeter to the GND pad. 8) Ensure that shunts are removed from jumper JU2. 9) Ensure that a shunt is placed across pins 1-2 of jumper JU3. 10) Ensure that a shunt is placed across pins 1-2 of jumper JU1. Evaluating the MAX4003 By default a MAX4003 is installed on the MAX4003 EV kit. To evaluate the MAX4003, remove the shunt on JU2 to disconnect the quasi-measurement mode circuitry from the MAX4003. Place the shunt on pins 1-2 of JU1 to connect pin 3 of the MAX4003 to ground. The voltage on the OUT pad reflects the power level of the RF input signal. Evaluating the MAX4000/MAX4001/MAX4002 Evaluating the MAX4000 The MAX4003 can be replaced with the MAX4000 to allow an input range of -45dBm to 0dBm into 50. The modifications required are as follows: 1) Replace U1 with a MAX4000EUA. Evaluating the MAX4001 or MAX4002 The MAX4003 can be replaced with the MAX4001 to allow an input range of -35dBm to +10dBm in 50, or with the MAX4002 to allow an input range of -30dBm to +15dBm in 50. The modifications required are as follows: 1) Replace U1 with a MAX4001EUA or MAX4002EUA. 2) Replace R9 with a 33pF (0402) capacitor. 11) Turn on the variable DC power supply. 12) Turn on/enable the output of the signal generator. 13) Verify with the voltmeter that an output voltage of 1.46V (5%) is produced between both the OUT and GND pads. 2 _______________________________________________________________________________________ MAX4003 Evaluation Kit MAX4000/MAX4001/MAX4002 Automatic Gain Control To simulate an automatic gain-control (AGC) loop, a quasi-measurement mode can be implemented where the MAX4000/MAX4001/MAX4002 deliver an output voltage that is proportional to the log of the input signal (see the Quasi-Measurement Mode section). To establish the transfer function of the log amp, the RF input power level should be swept while the voltage at the SET pad is measured. This is the simplest method to validate operation of the evaluation board. Filter Capacitor Selection When functioning as a PA controller, the MAX4000/ MAX4001/MAX4002 require some capacitance to maintain loop stability. Global system for mobile (GSM) applications require a control-loop bandwidth of at least 150kHz. Install a 2200pF capacitor at the location designated by C4 (located on the board's component side) to obtain this control-loop bandwidth. Refer to Figure 3 of the MAX4000/MAX4001/MAX4002 data sheet for alternative capacitor values. Quasi-Measurement Mode In the quasi-measurement mode, the MAX4003 EV kit works as a log detector. This mode allows for easy measurement of RFIN versus the SET voltage and these measurements can then be used to find the intercept and slope required for the given application. Place a shunt on pins 2-3 of JU1 and install a shunt across JU2 to enable the quasi-measurement mode, which connects the OUT voltage through an inverting op amp to the SET pin. The quasi-measurement mode yields a nominal relationship between RFIN and SET. See Table 1 for quasi-measurement mode shunt positions. Table 1. Quasi-Measurement Mode Selection JUMPER SHUNT POSITION DESCRIPTION Not installed Quasi-measurement mode disabled Pins 2-3 Quasi-measurement mode enabled Not installed Quasi-measurement mode disabled Installed Quasi-measurement mode enabled JU1 JU2 Note: Shunts must be installed on both JU1 and JU2 to enable the quasi-measurement mode. Jumper JU3 controls the CMOS-compatible shutdown pin (SHDN) of the MAX4003, which disables the MAX4003. Removing the shunt from JU3 allows the SHDN pin to be driven with an external signal source connected to the SHDN pad. See Table 2 for shutdown shunt positions. Layout Considerations Table 2. Shutdown Selection JUMPER JU3 SHUNT POSITION DESCRIPTION 1-2 MAX4003 enabled 2-3 MAX4003 disabled Not installed SHDN pin driven by an external signal source A good PC board is an essential part of RF circuit design. The MAX4003 EV kit PC board can serve as a guide for board layout using the MAX4000-MAX4003. Keep traces carrying RF signals as short as possible to minimize radiation and insertion loss due to the PC board. Each VCC node on the PC board should have its own decoupling capacitor. This minimizes supply coupling from one section of the PC board to another. Using a star topology for the supply layout, in which each VCC node in the circuit has a separate connection to the central VCC node, can further minimize coupling between sections of the PC board. Shutdown Control _______________________________________________________________________________________ 3 Evaluates: MAX4000-MAX4003 MAX4000/MAX4001/MAX4002 Controller Mode For operation in controller mode, both JU1 and JU2 should be removed. Use a DAC or external precision voltage supply to apply the set-point voltage to the SET pad. RFIN is connected to the RF source--power amplifier (PA) output through a directional coupler-- and the OUT pad is connected to the gain-control pin of the PA. When used in controller mode, a capacitor must be installed in C4 for loop stability (see the Filter Capacitor Selection section). Evaluates: MAX4000-MAX4003 MAX4003 Evaluation Kit SMA VCC R9 0 RFIN R2 52.3 1% RFIN VCC VCC JU3 U1 2 2 OUT SHDN 1 JU1 2 3 3 C1 0.1F OUT R4 OPEN N.C. GND 6 JU2 C8 100pF 4 C4 2200pF CLPF GND 5 R5 10k 1% C5 VCC 0.1F R1 100 1% 4 5 U2 1 MAX4412 2 3 R6 10k 1% VCC R7 14k 1% R8 10k 1% C3 0.1F Figure 1. MAX4003 EV Kit Schematic 4 GND R3 0 7 MAX4003 3 SET VCC 8 C7 100pF 1 SHDN 1 _______________________________________________________________________________________ C2 OPEN MAX4003 Evaluation Kit Figure 3. MAX4003 EV Kit PC Board Layout--Component Side Figure 4a. MAX4003 EV Kit PC Board Layout--Ground Plane Layer 2 Figure 4b. MAX4003 EV Kit PC Board Layout--Ground Plane Layer 3 _______________________________________________________________________________________ 5 Evaluates: MAX4000-MAX4003 Figure 2. MAX4003 EV Kit Component Placement Guide-- Component Side Evaluates: MAX4000-MAX4003 MAX4003 Evaluation Kit Figure 5. MAX4003 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Boblet