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19-1256; Rev 2; 10/98
MAX2102 Evaluation Kit
General Description
The MAX2102 evaluation kit (EV kit) simplifies evaluation of the MAX2102 direct-conversion tuner IC for digital DBS applications. The board includes RF and LO inputs and I/Q baseband-output connectors, for fast evaluation in a 50 environment. The RF and LO input frequency range is 950MHz to 2150MHz. A probe-tip jack is available to examine the prescaler output with a high-impedance probe.
____________________________Features
o Simple RF Test Board Offers 50 Test Ports for RF and LO Inputs and Baseband Outputs o Direct-Conversion Signal Tuning from 950MHz to 2150MHz, to I/Q Baseband o Input Levels: -69dBm to -19dBm per Carrier o Allows Testing of 50dB Automatic Gain-Control Range o Permits Observation of Dual-Modulus Prescaler Output
Evaluates: MAX2102
Component Suppliers
SUPPLIER AVX Panasonic PHONE (803) 946-0690 (201) 392-7522 FAX (803) 626-3123 (201) 392-4441
o Fully Assembled and Tested
Ordering Information
PART MAX2102EVKIT-SO TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
Component List
DESIGNATION QTY B1-B5 C1, C9 C2, C3, C8, C11 C4-C7, C14, C15 C10, C12 C13, C16 C17, C19, C21, C22 C20 C26, C27 J1, J3 5 2 4 6 2 2 4 1 2 2 DESCRIPTION Surface-mount bead cores Panasonic EXC-CL3216U 47F, 10V, 20% electrolytic capacitors Panasonic ECE-V1AA470P 0.1F, 50V (min), 10% ceramic capacitors 22pF, 50V (min), 10% ceramic capacitors 10pF, 50V (min), 10% ceramic capacitors 10pF, 50V (min), 10% ceramic capacitors 1000pF, 50V (min), 10% ceramic capacitors 10F, 16V, 20% tantalum capacitor AVX TAJC106M106 0.22F, 50V (min), 10% ceramic capacitors BNC connectors DESIGNATION QTY J2, J4, J5 J6 JU2, JU3 R1, R7 R3, R13 R4, R16 R6 R8, R10 R11, R12 R15 R17 U1 None None 3 1 2 Shunts 2 2 2 1 2 2 1 1 1 1 1 47, 5% resistors Open 51, 5% resistors 2k, 5% resistor 22, 5% resistors 56, 5% resistors 100, 5% resistor 4.7, 5% resistor Maxim MAX2102CWI (28-pin SO) MAX2102 circuit board MAX2102 data sheet DESCRIPTION Edge-mount SMA connectors Scope-probe connector 3-pin headers (0.1" centers)
________________________________________________________________ Maxim Integrated Products
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MAX2102 Evaluation Kit Evaluates: MAX2102
__________Test Equipment Required
* RF-signal generator to generate the RF-carrier signals, with 950MHz to 2150MHz frequency range and -69dBm to -19dBm power range. * RF-signal generator to generate the LO signal, with 950MHz to 2150MHz frequency range at -10dBm. * (Optional) RF balun, such as Anzac H-9, if testing the MAX2102 with a differential LO drive. * Dual-channel digitizing oscilloscope with 50 terminated inputs and 100MHz minimum bandwidth for time-domain baseband measurements. In addition, a high-frequency, high-impedance probe is required if monitoring the prescaler. * Network/spectrum analyzer capable of measuring 30kHz to 100MHz signals for frequency-domain baseband measurements. * +5V power supply that can deliver a minimum of 300mA. * Adjustable voltage source that can supply a 1V to 4V range and source and sink 500A for automatic gain control (AGC). 7) Set up the instruments: --Set the RF-carrier signal source to deliver 950MHz at -30dBm at RFIN. Be sure to account for attenuator and cable losses. --Set the LO signal source to deliver 950.125MHz at -10dBm at LO. Be sure to account for attenuator and cable losses. --Set up the oscilloscope to view a 125kHz sine wave at 0.5Vp-p full scale, triggered from either the "IOUT" or "QOUT" signal. 8) Turn on the power supplies and enable the signal generators. 9) Adjust the AGC control voltage until the IOUT and QOUT signals are approximately 0.25Vp-p.
Analysis
AGC
Vary the RF-carrier signal-generator power over the -19dBm to -69dBm range. Use the AGC voltage control (in a 1V to 4V range) to keep the IOUT and QOUT signals in the 0.25Vp-p range. Note (from the EV kit schematic) that the board includes 47 resistors (R1, R7) in series with the baseband IOUT and QOUT outputs, which results in a 6dB attenuation with the cable terminated to 50 at the oscilloscope. The actual voltage swing per carrier is 0.5Vp-p at the MAX2102's IOUT and QOUT pins. Vary the LO and RFIN frequency over the 950MHz to 2150MHz range, maintaining 125kHz between RFIN and LO. Observe that over 50dB, AGC range is maintained across the frequency band.
Connections and Setup
Ensure that the RF signal generators are disabled, and that the power supplies are off until all connections are made. 1) Connect the +5V power supply to J7 ("VCC"). Connect ground to J8 ("GND"). 2) Ensure that there are no shunts installed at JU2 or JU3. 3) Connect the variable voltage source to the pad labeled "AGC." Ensure that the voltage source's ground is connected to J8. 4) Connect an SMA cable from the LO signalgenerator source to SMA connector J4 (LO) on the board. A 6dB attenuator connected in-line between J4 and the cable is recommended to minimize reflections that could affect power-level control on some signal generators. See the section Using a Differential Oscillator Source for information on driving the LO port differentially. 5) Connect an SMA cable from the RF-carrier signalgenerator source to SMA connector J2 (RFIN). A 6dB pad between J2 and the cable is recommended. 6) Connect two cables of equal length from the dualchannel oscilloscope inputs to BNC connectors J1 and J3 ("IOUT," "QOUT"). Ensure that the oscilloscope inputs are 50.
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Quadrature Accuracy
The difference in phase between the IOUT and QOUT baseband signals should be 90, with Q lagging I if the LO frequency is greater than the RFIN frequency. Using both the oscilloscope's DELAY measurement function and averaging, determine the quadrature phase mismatch (deviation from 90). The baseband frequency is 125kHz. At higher baseband frequencies, the delay between IOUT and QOUT becomes more difficult to measure accurately. Additionally, phase error due to small differences in group delay in IOUT and QOUT measurement channels becomes more pronounced. Therefore, low baseband frequencies are suggested when making this measurement.
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MAX2102 Evaluation Kit
The quadrature amplitude mismatch is: Amplitude mismatch = 20log (AI / AQ) where AI = IOUT signal amplitude, and AQ = QOUT signal amplitude. Vary the LO and RFIN frequency over the 950MHz to 2150MHz range, maintaining 125kHz between RFIN and LO. Observe that the quadrature phase and gain mismatch remains within the specifications across the band. 3) Connect the RF balun so that LO and LO are driven by complementary signals. Drive the balun input from the LO signal source. Ensure that any unused ports on the balun are terminated with 50 terminators. A 6dB attenuator connected in-line between the LO and LO ports and the balun is recommended to minimize reflections, which may affect balun and signal-generator performance. 4) Drive the balun with sufficient power to drive LO and LO with -10dBm each. Be sure to account for losses in the balun, cables, and attenuators.
Evaluates: MAX2102
Adjustments and Control
Prescaler
Jumper JU2 controls prescaler enabling and disabling. The prescaler on the MAX2102 EV kit is configured to be disabled as shipped. In this configuration, there is no short installed on JU2. To enable the prescaler, install a short in the "PSON" position. This connects pin 25 on the MAX2102 to GND. JU3 controls the prescaler divider ratio (modulus). Install a short in the "DIV65" position for divide-by-65 mode, or in the "DIV64" position for divide-by-64 mode. For external control of the prescaler modulus (for example, from an external synthesizer), drive JU3's center connector directly.
Interface to MAX1002/MAX1003 A/D Converters
The MAX2102 EV kit can easily be interfaced to the MAX1002/MAX1003 EV kit, allowing evaluation of the MAX2102 in the digital domain. The MAX1002/ MAX1003 are low-cost, dual, 60Msps/90Msps analogto-digital converters for DBS applications. For most applications, an anti-aliasing lowpass filter is inserted in the signal path between IOUT (MAX2102 EV kit) and IIN+ (MAX1002/MAX1003 EV kit), and another equivalent filter is inserted between QOUT and QIN+. Refer to the MAX2102/MAX2105 data sheet for details on this filter. Using 50 filters with BNC connectors is a simple way to implement the necessary filtering.
Using a Differential Oscillator Source
To use a differential LO source, do the following: 1) Remove R16. 2) Install J5 (SMA connector), if not already populated.
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Evaluates: MAX2102
MAX2102 Evaluation Kit
Figure 1. MAX2102 EV Kit Schematic
JU3 VCC C20 10F R15 100 B5 VCC J6 PSOUT C3 0.1F 1 VCC VCC R6 2k C12 10pF R17 4.7 VCC C17 1000pF C21 1000pF C19 1000pF 2 2 VCC DIV 65 1 DIV 64 3 PSON 1 PSOFF 3 JU2 28 27 26 25 C16 10pF B4 VCC C15, 22pF R8 22 LO B2 VCC C4 22pF C13 10pF B3 C27 0.22F C26 0.22F VCC R16 51 R13 OPEN C5 22pF C14, 22pF R11 56 R10 R12 22 56 J4 J5 SMA SMA LO J2 RFIN R3 OPEN C11 0.1F VCC C7 R4 22pF 51 C6, 22pF 2 3 4 5 6 7 8 9 10 11 12 C10 13 10pF 14 MOD IOUT PSOUT GND PSGND VCC GND GND VCC VCC U1 RFIN LO RFIN LO MAX2102 V GND CC AGC GND GND IDC GND IDC QOUT QDC VCC QDC 24 23 22 21 20 19 18 17 16 15 AGC C22 1000pF C9 47F R7 47 C8 0.1F
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J7
VCC
J8
GND
C1 47F
J1
R1
BNC
IOUT
47
C2 0.1F
B1
VCC
SMA
BNC
J3
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QOUT
MAX2102 Evaluation Kit Evaluates: MAX2102
1.0"
Figure 2. MAX2102 EV Kit Component Placement Guide-- Component Side
1.0"
Figure 3. MAX2102 EV Kit Component Placement Guide--Solder Side
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MAX2102 Evaluation Kit Evaluates: MAX2102
1.0"
Figure 4. MAX2102 EV Kit PC Board Layout--Component Side
1.0"
Figure 5. MAX2102 EV Kit PC Board Layout--Ground Plane
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MAX2102 Evaluation Kit Evaluates: MAX2102
1.0"
Figure 6. MAX2102 EV Kit PC Board Layout--Power Layer
1.0"
Figure 7. MAX2102 EV Kit PC Board Layout--Solder Side
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MAX2102 Evaluation Kit Evaluates: MAX2102
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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