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| 19-1331; Rev 1; 6/98 MAX3532 Evaluation Kit General Description The MAX3532 evaluation kit (EV kit) simplifies evaluation of the MAX3532 CATV upstream driver amplifier. It includes a serial data interface, which can be programmed via the parallel port of a standard PC. A QuickBasicTM program is included to facilitate this function. This software allows the user to program both the gain and transmit modes via a simple user interface. Access to the device input and output is provided through 50 SMA connectors. The input is matched to 50, while the output circuit contains a series 24 resistor that increases the load on the output transformer to 75 when using 50 test equipment at the output. o Single +5V Operation o Output Level Range from < 8dBmV to 62dBmV o Gain Programmable in 1dB Steps via Software o 350mW Typical Power Dissipation o Transmit-Disable Mode o Two Shutdown Modes o Control Software Included o Fully Assembled and Tested Surface-Mount Board Features Evaluates: MAX3532 Component List DESIGNATION QTY C1-C3, C6 C4, C7 C5 R1 R2, R6-R13, R16-R20 R3, R4 R5 R14, R15 J1, J4 L1-L4 T1 JU5-JU8 JU1-JU3 J5 None B1 +5V, GND U1 None None None 4 2 1 1 14 2 1 2 2 4 1 4 3 1 7 1 2 1 1 1 1 DESCRIPTION 0.1F, 25V min, 10% ceramic capacitors 0.001F, 25V min, 10% ceramic capacitors 10F 10%, 10V min tantalum capacitor AVX TAJB106K010 51, 5% resistor Not installed. 8.2 1% resistors 24 5% resistor 100k 5% resistors SMA connectors (edge mount) 1.2H inductors Coilcraft 1008LS-122XKBC 4-to-1 transformer (2:1 voltage ratio) Mini-Circuits T4-1-2W 3-pin headers (0.1" centers) 2-pin headers (0.1" centers) Female, right-angle DB25 connector Shunt Surface-mount bead core Panasonic EXC-CL3216U Test points MAX3532EAX MAX3532 data sheet MAX3532 circuit board MAX3532 software disk PART MAX3532EVKIT Ordering Information TEMP. RANGE -40C to +85C IC PACKAGE 36 SSOP Component Suppliers SUPPLIER AVX Coilcraft Mini-Circuits Panasonic PHONE 803-946-0690 847-639-6400 718-834-4500 714-373-7939 FAX 803-626-3123 847-639-1469 718-832-4961 714-373-7183 Note: Please indicate that your are using the MAX3532 when contacting these suppliers. _________________________Quick Start The MAX3532 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section. Note: The output circuit contains a series 24 resistor that is used to bring the load impedance up to 75. This must be accounted for in all measurements (see Detailed Description). * DC supply capable of delivering 5.5V and 200mA of continuous current. * HP or equivalent signal source capable of generating 40dBmV up to 200MHz. * HP8561E or equivalent spectrum analyzer with approximately 200MHz frequency range. * Digital multimeter (DMM) to monitor VCC and ICC, if desired. * Lowpass filters to control harmonic output of signal sources, if harmonic measurements are desired. 1 Test Equipment Required QuickBasic is a trademark of Microsoft Corp. Protected under U.S. Patent 5,748,027 ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. MAX3532 Evaluation Kit MAX3532 * Network analyzer such as HP8753D. (May be used to measure gain and harmonic levels if configured with this option; contact manufacturer.) * IBM PC or compatible. * Male-to-male 25-pin parallel cable, straight through. * Place the device in software shutdown * Input a new gain state Test the software by typing the number "6" (then press Enter) to place the device in software-shutdown mode. The current being drawn by the device should drop to approximately 2mA. If this happens, the software is functioning. If this does not happen, check the appropriate connections; in particular, ensure that jumpers JU1, JU2, and JU3 are shunted. Connections and Setup 1) Connect the +5V power supply to +5V and GND on the circuit board. Connect a 50 signal source to VIN and terminate VOUT with a spectrum analyzer or network analyzer having a 50 input impedance. If using a signal source with a source impedance other than 50, or if a different input impedance is required, be sure to replace resistor R1 with the appropriate value. 2) Connect a 25-pin male-to-male cable between the parallel (printer) port of the PC and the 25-pin female connector on the EV kit board. Ensure that shunts are placed on jumpers JU1, JU2, and JU3. These shunts connect the appropriate pins of the DB25 connector to the serial data interface of the MAX3532. Also check that pins 1 and 2 of jumpers JU5 and JU6 are shunted. Additionally, ensure that pins 2 and 3 of JU7 and JU8 are shunted. Note: Pin 1 of all jumpers is defined as the closest pin to the designator. Gain Adjustment Valid gain states range from 0 to 63. The nominal change in gain is 1dB per gain state. The actual gain range of the MAX3532 is limited at high power levels by device saturation and is limited at low power levels by leakage through the device. This leakage is frequency dependent. See the MAX3532 data sheet for more detailed information. Shutdown and Transmit Enable Jumpers JU5 and JU6 determine how the shutdown and transmit-enable features are controlled. Pin 2 of each of these jumpers is connected directly to the device. If an external source (such as a modulator chip or microprocessor) is used to control these features, simply make the connection to pin 2 of the appropriate jumper. Otherwise, pins 1 and 2 of JU5 and JU6 must be shunted. On-board control of SHDN (shutdown) and TXEN (transmit enable) is accomplished manually via jumpers JU7 and JU8. JU7 and JU8 are used to place either +5V or GND at TXEN or SHDN. Pin 1 of these jumpers is GND and pin 3 is +5V. 3) Turn on the power supply. Turn on the PC and the test equipment. Set the signal source for 36dBmV. 4) From the DOS prompt of the PC, enable QuickBasic by typing "qbasic". Open the file "MAX3532.bas" from the appropriate directory. Run the program. _______________Detailed Description Using the Software When the software is first enabled, it places the MAX3532 in low-noise mode with a gain state of 58-- approximately 10dB of gain. At this point the device will draw approximately 75mA. The software allows the user to do the following: * Increment the gain state by 1 (add 1dB of gain) * Decrement the gain state by 1 (decrease the gain by 1dB) * Enable high-power mode * Enable low-noise mode * Place the device in transmit disable mode Manual Control of Serial Data Interface If using another source to drive the serial data interface of the MAX3532 EV kit (such as a digital pattern generator or microprocessor), remove the shunts on jumpers JU1, JU2, and JU3. Access to the serial data interface is available through pin 1 of these jumpers. Output Circuit The MAX3532 uses a differential emitter-follower output to suppress second-order distortion. In order to achieve a single-ended output and to attain higher output voltages, a 1:2 (voltage ratio) transformer is used. Furthermore, the output impedance of the MAX3532 itself is less than 2. In order to match this output to 75, a pair of 8.2 back-termination resistors is used. 2 _______________________________________________________________________________________ MAX3532 Evaluation Kit The output circuit is designed for a good match to 75, with the quality of the match largely determined by the value of the back-termination resistors. In general, in a 75 system the large-signal performance of the device will improve as these resistor values are reduced; however, the output match will suffer. If a load impedance other than 75 is to be used, the value of R3 and R4 can be approximated by the following equation: R = (RLOAD / 8) - 1 Since most test equipment is supplied with a 50 termination impedance, a series 24 resistor is provided with this EV kit to increase the load impedance to a nominal 75. This places the proper load on the device but will also reduce the measured output voltage level by 3.5dB. It is important to consider this when making any measurements with the EV kit. 3.5dB must be added to all measurements of voltage gain and output voltage level (including noise) to arrive at the correct value for a 75 system. If 75 test equipment is available, take the following steps: 1) Remove the 50 output SMA connector and replace it with a 75 connector. 2) Remove R5 (the 24 series output resistor) and replace it with a 0 resistor or some other type of short. 3) Be sure to use a 75 cable on the output. (20MHz tone) is within 5dB to 15dB of the reference level. If the fundamental is less than 5dB below the reference level, the harmonic distortion of the spectrum analyzer will prevent accurate measurement of the distortion. To set the gain state, type the number "7" and press the Enter key on the PC. You will be prompted to enter the gain state. Type "30" and press Enter. Place the device in low-noise mode by typing "4" and pressing Enter. Measure the level of the fundamental, second, and third harmonics on the spectrum analyzer. These readings have units of dBm. To convert from dBm to dBmV in a 50 system, use the following equation: dBmV = dBm + 47dB (50 system) Add 3.5dB to the converted value to arrive at the correct output voltage, in dBmV, for a 75 load. The gain can now be calculated in dB, and the harmonic distortion can be calculated in dBc. Now place the device in high-power mode. Type "3" on the PC and press the Enter key. This will increase the gain by approximately 16dB. The steps taken above can be repeated to solve for gain and harmonic distortion in high-power mode. Evaluates: MAX3532 Layout Considerations The MAX3532 evaluation board can serve as a guide for your board layout. Particular attention has been paid to the output circuit prior to the transformer and the DC supply trace to pins 29 and 30. The traces leading from output pins 33 and 34 must be as short as possible and absolutely symmetrical to reject second harmonics. Additionally, keep the back-termination resistors as close to the device as possible to minimize the effects of inductance on the device's low output impedance. Since the device can draw close to 100mA when swinging the maximum signal, the supply trace to pins 29 and 30 must be as wide as practical to minimize resistive loss. Ground inductance and supply decoupling loop inductance degrade distortion performance. Therefore, ground plane connections to VEE (pin 26) and VEE2 (pin 31) should be made with multiple vias if possible. Returning supply decoupling capacitors for pins 29 and 30 directly to pins 26 and 31, respectively, is recommended. Otherwise, use multiple vias to the ground plane. Analysis The following is an example of a simple harmonic distortion measurement. A filter will be needed to reject the harmonics generated by the signal source. For this example, a lowpass filter with approximately a 25MHz to 35MHz cutoff frequency will be required. This filter will also need to reject at least 20dB of signal at 40MHz. Set the signal source for 20MHz and 36dBmV. Adjust the amplitude to account for the insertion loss in the filter. Verify with the spectrum analyzer that the second and third harmonics generated by the source are suppressed by at least 70dB. Place the filter between the input of the EV kit and the signal source, making sure that the proper terminations are being used for this particular filter. Connect a spectrum analyzer to VOUT. Set the center frequency for 40MHz and the span for 50MHz or more. Adjust the reference level so that the fundamental _______________________________________________________________________________________ 3 MAX3532 VCC3 3 2 JU7 VCC3 3 J5-6 3 1 2 JU8 1 R19 OPEN 1 GND SHDN GND TXEN 1 34 2 3 4 32 31 30 VCC2 VCC *C7 0.001F 29 28 27 26 25 24 23 22 21 20 SCLK SDA 19 JU2 JUMPER 2 1 J5-3 R14 100k VCC3 R15 100k J5-15 *REV B MISLABELED AS R21 J5-10 J5-7 J5-13 J5-4 R17 OPEN JU3 JUMPER 2 1 R18 OPEN C4 0.001F C2 0.1F R1 51 C3 0.1F R4 8.2 33 R2 OPEN 5 VOUTVOUT+ GND3 VEE2 VCC2 VCC VIN+ VINVEE GND GND GND GND GND GND GND GND GND GND GND GND GND VEE1 GND GND VCC1 GND GND GND CS 2 T1 OPEN 3 OPEN 4 5 6 7 8 9 10 11 C1 0.1F 13 14 15 16 JU1 JUMPER 2 1 17 18 R16 OPEN 12 OPEN OPEN OPEN OPEN OPEN OPEN 36 35 R3 8.2 R5 24 J4 VOUT R20 OPEN 2 JU6 1 3 2 VCC VCC1 VCC2 VCC3 JU5 1 FERRITE B1 L1, 1.2H L2, 1.2H L3, 1.2H L4, 1.2H C6 0.1F J5-5 MAX3532 Evaluation Kit Figure 1. MAX3532 EV Kit Schematic U1 MAX3532 J1 VIN J5-18 J5-19 J5-20 J5-21 J5-22 J5-23 J5-24 J5-25 VCC1 J5-2 4 +5V C5 10F 10V GND J5-1 R6 J5-8 R7 J5-9 R8 J5-11 R9 J5-12 R10 J5-14 R11 J5-16 R12 _______________________________________________________________________________________ J5-17 R13 MAX3532 Evaluation Kit Evaluates: MAX3532 1.0" 1.0" Figure 2. MAX3532 EV Kit Component Placement Guide-- Component Side Figure 3. MAX3532 EV Kit Component Placement Guide-- Solder Side _______________________________________________________________________________________ 5 MAX3532 Evaluation Kit MAX3532 1.0" 1.0" Figure 4. MAX3532 EV Kit PC Board Layout--Component Side Figure 5. MAX3532 EV Kit PC Board Layout--Ground Plane 6 _______________________________________________________________________________________ MAX3532 Evaluation Kit Evaluates: MAX3532 1.0" Figure 6. MAX3532 EV Kit PC Board Layout--Power Plane 1.0" Figure 7. MAX3532 EV Kit PC Board Layout--Solder Side _______________________________________________________________________________________ 7 MAX3532 Evaluation Kit Evaluates: MAX3532 NOTES 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) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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