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19-2092; Rev 0; 7/01
MAX3507 Evaluation Kit
General Description
The MAX3507 evaluation kit (EV kit) simplifies evaluation of the MAX3507 CATV upstream amplifier. Each kit includes a data interface that can be programmed through the parallel port of a standard PC. Software (Windows(R) 95/98 compatible) is included to facilitate this function. This software allows programming of all available features through a simple user interface. Access to the device input and output is provided through 50 SMA connectors. The input is matched to 50. The output circuit includes a minimum-loss pad that presents a 75 load to the output transformer when using 50 test equipment. o +5V Single-Supply Operation o Output Level Range Up to +64dBmV (QPSK) o Gain Programmable in 0.5dB Steps o Transmit Disable Mode o Shutdown Mode o Control Software Included o Fully Assembled and Tested Surface-Mount Board
Features
Evaluates: MAX3507
Ordering Information
PART MAX3507EVKIT TEMP. RANGE -40C to +85C IC PACKAGE 28 QFN
Component List
DESIGNATION B3-B6 C1, C2, C5, C8-C11 QTY 4 7 DESCRIPTION Murata BLM21A601RPT 0.1F 10% ceramic capacitors (0603) Murata GRM39X7R104K016A 1000pF 10% ceramic capacitors (0603) Murata GRM39X7R102K050A Leave site open 10F 10% 16V min tantalum capacitor AVX TAJC106K016 Test points Digi-Key 5000K-ND SMA connector (PC-mount) EF Johnson 142-0701-201 or Digi-Key J500-ND DB25 connector, right angle, female Digi-Key A2102-ND or AMP 745783-4 SMA connector (edge-mount) EF Johnson 142-0701-801 or Digi-Key J502-ND 1 x 3 pin headers (0.1in centers) Digi-Key S1012-36-ND DESIGNATION JU1-JU7 L1 L2-L5 R1-R4, R6-R13, R18-R20 R5 R14, R15 R16 R21 R24 T1 T2 U1 None None None QTY 7 1 4 15 1 2 1 1 1 1 1 1 1 1 1 DESCRIPTION Shunts Digi-Key S9000-ND 0 resistor (0805) 0 resistors (0603) Leave site open 43.2 1% resistor (0805) 100k 5% resistors (0603) 49.9 1% resistor (0603) 86.6 1% resistor (0805) 0 1% resistor (0603) Transformer 1:1 M/A-COM ETC1-1T Transformer 2:1 voltage ratio Toko 458PT-1087 MAX3507EGI 28-pin QFN MAX3507 EV kit circuit board, Rev 2 MAX3507 data sheet MAX3507 EV kit data sheet
C3, C4 C6, C12-C17 C7
2 7 1
IN1, IN2
2
J1
1
J2
1
J3
1
JU1-JU7
7
Windows is a registered trademark of Microsoft Corp. ________________________________________________________________ Maxim Integrated Products 1
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.
MAX3507 Evaluation Kit Evaluates: MAX3507
Component Suppliers
SUPPLIER AVX Digi-Key EF Johnson M/A-COM Murata Toko PHONE 843-448-9411 800-344-4539 800-328-3911 978-442-5000 800-831-9172 800-745-8656 FAX 843-448-1943 218-681-3380 507-835-6969 978-442-4178 814-238-0490 708-699-1194 WEBSITE www.avxcorp.com www.digikey.com www.efjohnson.com www.macom.com www.murata.com www.tokoam.com
Quick Start
The MAX3507 EV kit is fully assembled and factory tested. Follow the instructions in the Connections and Setup section. Note that the output circuit includes a minimum-loss pad that is used to bring the output impedance up to 75. This must be accounted for in all measurements (see Output Circuit section). Also note, the input balun is supplied to allow differential input drive from a single-ended source. A balun is not required in the application.
* Low-noise amplifier with 40dB gain from 5MHz to 100MHz for noise measurement * Oscilloscope with 200MHz bandwidth * Network analyzer, such as the HP 8753D. (May be used to measure gain vs. frequency)
Connections and Setup
1) Connect the power supply (preset to +5V) to the pins labeled +5V and GND on the circuit board. Connect the 50 signal source to INPUT (preset the signal source for -13dBm (+34dBmV across a 50 load)), and terminate OUTPUT with a 50 spectrum analyzer. If using a signal source with a source impedance other than 50, or if a different input impedance is required, be sure to replace R1 with the appropriate value resistor. 2) Connect the 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. 3) See Table 1 for board jumper settings. Set all jumpers to PC port control, unless otherwise stated. 4) Turn on the power supply. Turn on the PC and the test equipment. 5) Run the software program.
Test Equipment Required
* DC supply capable of delivering +5.5V and 400mA of continuous current * HP 8648 (or equivalent) signal source capable of generating 40dBmV up to 200MHz * HP 8561E (or equivalent) spectrum analyzer with a minimum 200MHz frequency range * Two digital multimeters (DMMs) to monitor VCC and ICC, if desired * IBM PC or compatible with Windows 95/98 installed * Male-to-male 25-pin parallel cable, wired straight through * 0 to +5V pulse generator for transient measurement
Table 1. Jumper Setting Functions
JUMPER JU1 JU2 JU3 JU4 JU5 JU6 JU7 FUNCTION Set the method of control of SHDN Set the manual control state of SHDN Set the method of control of TXEN Set the manual control state of TXEN CS input SDA input SCLK input SHORT PIN1 TO PIN2 PC port control Logic 1 state (VCC) PC port control Logic 1 state (VCC) PC port control PC port control PC port control SHORT PIN2 TO PIN3 Manual control through JU2 Logic 0 state (GND) Manual control through JU4 Logic 0 state (GND) N/A N/A N/A
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MAX3507 Evaluation Kit
Detailed Description
Using the Software
The MAX3507 uses a serial data interface (SDI) to set gain. Some method of communicating with the SDI is required to use the MAX3507 EV kit. A microprocessor, pattern generator, or PC can be used for this function. Software and supporting documentation for programming the part through the parallel port of a PC can be found at www.maxim-ic.com/TechSupport/other.htm. The valid gain code ranges from 0 to 127 (decimal). The nominal change in gain is 0.5dB per gain code. Gain codes are set exclusively by programming the SDI. Refer to the MAX3507 data sheet for details. and R4). Solder an appropriate resistor to these pads, if desired. Refer to the MAX3507 data sheet for a description of the serial data interface. To control the SDI by using the supplied software, shunt pins 1 and 2 of JU5, JU6, and JU7 together.
Evaluates: MAX3507
Input Circuit
The input circuit of the MAX3507 EV kit is configured with a 1:1 balun, terminated in 50 (T1). This allows the input to be driven with single-ended 50 test equipment. The balun is used to generate a differential signal, as rated performance is specified with a differential input drive. If the MAX3507 itself is to be driven single ended, the input balun must be removed and the undriven input connected to ground through a 0.1F blocking capacitor.
High Power and Low Noise
High-power (HP) mode and low-noise (LN) mode may only be controlled through the PC interface. Manual control of the jumpers for the EV kit's board is not possible. For DOCSIS applications, HP mode should be used for output levels above 42dBmV. This corresponds to gain code 79. LN mode should be used below this output level. This corresponds to gain code 109. A transition from HP mode, gain code 79, to LN mode, gain code 107, results in a -1dB step.
Output Circuit
The MAX3507 has differential outputs. This architecture aids in suppressing second-order distortion (harmonics). To convert to a single-ended output, a 4:1 transformer (T2) is used. Since most test equipment is supplied with a 50 input impedance, a minimum-loss pad is provided on the output of the transformer to increase the load impedance to a nominal 75. This places the proper load on the device, but also reduces the measured output voltage level by 7.5dB. It is essential to consider this when making any measurements with the EV kit; 7.5dB 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. Use 75 test equipment, if available, and take the following steps: 1) Remove the 50 output SMA connector and replace it with a 75 connector. 2) Remove R5 and replace it with a 0 resistor or some other type of shunt. 3) Remove R21. 4) Be sure to use a 75 cable.
Shutdown and Transmit Enable
JU1 through JU4 determine how the shutdown and transmit enable features are controlled. Pin 2 of JU1 and JU3 is connected directly to the device. If an external source (such as a modulator chip or microprocessor) is used to control these features, make the connection to pin 2 of JU1 and JU3. Pads are provided on the bottom side of the board (R18 and R19, respectively) for placement of termination resistors, if needed. If manual control of shutdown and transmit enable is desired, shunt pins 2 and 3 of JU1 and JU3. This allows SHDN and TXEN to be controlled by JU2 and JU4, respectively. JU2 and JU4 are used to place either VCC or ground at SHDN or TXEN. Pin 3 of JU2 and JU4 is ground, and pin 1 is VCC. To control the SHDN and TXEN features through the supplied software, shunt pins 1 and 2 of JU1 and JU3.
Analysis
Harmonic Distortion Set the signal source for 20MHz and -13dBm. Verify that the second and third harmonics generated by the source are suppressed by at least 60dBc. Filters are usually required to achieve these harmonic levels. Connect a spectrum analyzer to OUTPUT. Set the center frequency to 40MHz and the span to 50MHz or more. Adjust the reference level so that the fundamen-
Manual Control of Serial Data Interface (SDI)
If using a source other than a PC to bit bang the SDI of the MAX3507 EV kit (such as a digital pattern generator or microprocessor), shunt pins 2 and 3 of jumpers JU5, JU6, and JU7. Access to the SDI is available through these jumpers. Termination pads are provided (R2, R3,
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3
MAX3507 Evaluation Kit Evaluates: MAX3507
tal (20MHz tone) is within 10dB to 20dB of the reference level. If the fundamental is less than 10dB below the reference level, the harmonic distortion of the spectrum analyzer may prevent accurate measurement of the distortion. If necessary, use the manual attenuation setting to ensure at least 20dB of input attenuation. Set the gain code to 125, D7 = 1 (approximately 30dB of gain). 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: X(dBmV) = Y(dBm) + 47dB (50 system) Add 7.5dB to this value to account for the attenuation of the minimum-loss pad in dBmV. The gain can now be calculated in dB, and the harmonic distortion can be calculated in dBc. The harmonic distortion should be approximately 55dBc. Switching Transients To measure the transmit enable and transmit disable transients, the TXEN pin is driven from an external source. No input signal is applied, and the output is viewed on an oscilloscope. Connect OUTPUT to the oscilloscope's 50 input. Set the scope's time base to 5s/div and the vertical scale to 5mV/div. Set the pulse generator as follows: Amplitude: 5V Duty Cycle: 50% Rise/Fall Time: 100ns Pulse Width: 25s Offset: 2.5V Take care not to drive the MAX3507 TXEN pin below zero or above +5V. Turn on the power supply. Remove the shunt from jumper JU3 (TXEN), and connect the output of the pulse generator to pin 2 of this jumper. Trigger the oscilloscope from the pulse generator using a convenient method. Set the gain code to 119, D7 = 1. A rising- and falling-edge transient should appear on the scope's CRT. The amplitude of this transient should be less than 40mVp-p. Multiply the value of the measured transient by 2.37 to account for the presence of the minimum-loss pad. The gain may now be changed to show the output transient's dependence on gain. Output Noise To measure output noise, a spectrum analyzer is used. A postamplifier with less than 10dB noise figure and greater than 40dB gain within the band of interest is needed. With the power supply off, place a 50 termination on the input of the EV kit. Turn on the power supply to the MAX3507 EV kit. Using the software, set the device to transmit mode with a gain code of 119, D7 = 1. Connect the output of the postamplifier to the spectrum analyzer and the input to OUTPUT on the EV kit. Set the spectrum analyzer as follows: Center Frequency: 35MHz Span: 60MHz Reference: -50dBm Scale: 10dB/div IF Bandwidth: 1kHz Power up the postamplifier If the spectrum analyzer being used has a noise marker function, enable it. Otherwise, be sure to divide the measured power by 10log (RBW). Move this marker to 42MHz. Read the value of the noise density from the spectrum analyzer. This noise value is a combination of the output noise of the MAX3507, the gain of the postamplifier, and the noise figure of the postamplifier. With the specified noise figure of 10dB, the noise contribution of the postamplifier may be ignored. The minimum-loss pad reduces the actual measured value by 7.5dB. Use the following equation to arrive at the MAX3507's output noise in a 160kHz bandwidth: VNOISE = PNOISE + 47dB + 7.5dB + 10 x log (160,000) - GAMP where: VNOISE = MAX3507 output noise in dBmV measured in a 160kHz bandwidth PNOISE = Noise density in dBm/Hz read from the spectrum analyzer GAMP = Gain of the postamplifier in dB
Layout Considerations
The MAX3507 evaluation board can serve as a guide for your board layout. Particular attention should be paid to thermal design and to the output network. The output circuit that connects OUT- and OUT+ (pins 18 and 19) to the output transformer (T2) should be as symmetrical as possible to reduce second-order distortion. In addition, the capacitance of this path should be kept low to minimize gain roll-off at high frequencies.
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IN1 VCC B5 BLM21A601RPT VCC1 B6 BLM21A601RPT VCC2 J2-7 VCC3 R6 OPEN R15 100k J2-15 C12 OPEN R20 OPEN VCC2 VCC TXEN 23 VEE6 VCC2 JU3 J2-6 21 JU4 22 VCC1 26
EQN
B4 BLM21A601RPT
C7 10F
C8 0.1F
IN2 R14 100k VCC J2-13
J2-10
J2-1 R7 OPEN C10 0.1F C11 0.1F R8 OPEN 28 27
EQP
VEE1
J2-11 R10 OPEN BIASF TXEN 2 DCP VCC3 N.C. C1 0.1F 3 DCN VOUTP 19 1 VOUTN 18 B3 2 R11 OPEN 20 R19 OPEN 1
R24 0
J2-12
J2-14 R12 OPEN
VCC1
N.C.
VEE3B
SDA
SCLK
VEE5
CS
N.C.
SHDNB
Figure 1. MAX3507 EV Kit Schematic
R9 OPEN 25 24 1 2 3 4 XFMRMINICIRCUIT C9 0.1F N.C. 17 T2 5 L1 0 RES R5 43.2 OUTPUT J3
J2-8
J2-9
J2-16
U1
R13 OPEN 4 VEE3A
SMA R21 86.6
INPUT J1
SMA C16 OPEN 5V CC3 VCC1 6 VIP C3 1000pF L5 0 RES C14 OPEN R16 49.9 C4 1000pF 7 VIN L4 0 RES C15 OPEN 8 9 10 11 12 C2 0.1F
J2-17
MAX3507
BLM21A601RPT
C6 OPEN
R1 OPEN
5 C17 OPEN
T1
L3 0 RES
1
CEXT 16 C5 0.1F N.C. 15
VCC SHDN JU2
2
4
3
C13 OPEN
XFMRMINICIRCUIT
L2 0 RES
JU1 J2-5 13 14
J2-18 JU5 J2-2 R18 OPEN
J2-19
J2-20
J2-21 JU6 J2-3
J2-22
J2-23 JU7 J2-4 R2 OPEN R3 OPEN R4 OPEN
J2-24
Evaluates: MAX3507
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J2-25
MAX3507 Evaluation Kit
5
MAX3507 Evaluation Kit Evaluates: MAX3507
1.0"
1.0"
Figure 2. MAX3507 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX3507 EV Kit PC Board Layout--Solder Side
1.0"
Figure 4. MAX3507 EV Kit PC Board Layout--Component 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) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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