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19-4797; Rev 0; 2/99
MAX2470/MAX2471 Evaluation Kits
General Description
The MAX2470/MAX2471 evaluation kits (EV kits) simplify the evaluation of the MAX2470/MAX2471 VCO buffer amplifiers. They enable testing of the devices' performance and require no additional support circuitry. All inputs and outputs use SMA connectors to facilitate easy connection of RF test equipment. The MAX2470 EV kit is assembled with the MAX2470 and provides one high-impedance input (with pads to terminate to 50) and a pair of matched 50 differential outputs. JU1 sets the logic level at the HI/LO bias-control input, allowing for selection between 10MHz to 500MHz and 10MHz to 200MHz operation. The MAX2471 EV kit is assembled with the MAX2471 and provides two highimpedance inputs (with pads to terminate to 50) and a pair of matched 50 differential outputs.
Component Lists
Common Components for MAX2470/MAX2471 EV Kits
DESIGNATION QTY C1, C2, C3, C5 C6 R3, R4 J1, J2, J3 J5, J6 None None 4 1 2 3 2 1 1 DESCRIPTION 2200pF, 10%, 25V ceramic-chip capacitors (0603) 10F, 10%, 10V tantalum capacitor AVX TAJC106K016 Optional 50 input-termination resistors (0603) (not installed) SMA connectors (PC top mount) E.F. Johnson 142-0701-216 Test points Mouser 151-203 MAX2470/2471EVKIT PC board MAX2470/MAX2471 EV kit manual
Evaluate: MAX2470/MAX2471
Features
o Easy Evaluation of MAX2470/MAX2471 o +2.7V to +5.5V Single-Supply Operation o On-Board Input-Frequency Range Selection (MAX2470) o Single-Ended (MAX2470) or Differential (MAX2471) Inputs o All Critical Peripheral Components Included
Additional Components for MAX2470 EV Kit
DESIGNATION QTY C7 JU1 1 1 1 1 1 1 DESCRIPTION 2200pF, 10%, 25V ceramic-chip capacitor (0603) 3-pin header (0.100" centers) Digi-key S1012-36-ND Shunt (jumper) Digi-key S9000-ND 0, 5% chip resistor (0603) 1k, 5% chip resistor (0603) MAX2470EUT
Ordering Information
PART MAX2470EVKIT MAX2471EVKIT TEMP. RANGE -40C to +85C -40C to +85C IC PACKAGE SOT23-6 SOT23-6 SOT TOP MARK AAAX AAAY
JU1 R1 R2 U1
Component Suppliers
SUPPLIER AVX PHONE FAX URL http://www.avxcorp.com http://www.ef johnson.com 803-946-0690 803-626-3123
Additional Components for MAX2471 EV Kit
DESIGNATION QTY C4 J4 U1 1 1 1 DESCRIPTION 2200pF, 10%, 25V ceramic-chip capacitor (0603) SMA connector (PC top mount) E.F. Johnson 142-0701-216 MAX2471EUT
E.F. Johnson 402-474-4800 402-474-4858
________________________________________________________________ Maxim Integrated Products
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MAX2470/MAX2471 Evaluation Kits Evaluate: MAX2470/MAX2471
_________________________Quick Start
The MAX2470/MAX2471 EV kits are fully assembled and factory tested. Follow the instructions in the Connections and Setup section for proper device evaluation. 3) For a differential power-gain measurement, connect a balun between the outputs of the buffer and the spectrum analyzer.
Analysis
Adjust the frequency span, center frequency, and amplitude of the spectrum analyzer to observe the signal peak at 200MHz; the output signal power should read approximately -6dBm for the MAX2470 and -5dBm for the MAX2471.
Test Equipment Required
This section lists the recommended test equipment to verify the operation of the MAX2470/MAX2471. It is intended as a guide only, and some substitutions are possible. * One DC power supply capable of supplying a minimum of 10mA at +2.7V to +5.5V. * One RF spectrum analyzer capable of making measurements over the bandwidth of the MAX2470/ MAX2471 and a few harmonics, such as the HP 8561E. * One RF signal generator capable of delivering 0dBm output power at 500MHz, such as the HP 8648C signal generator. * Two baluns with a 2:1 turns ratio and an operating range encompassing 10MHz to 500MHz, such as the Macom model number 96341 180 hybrid (balun). Fully differential measurements for the MAX2470 require a single 180 hybrid at the output. Fully differential measurements for the MAX2471 require two 180 hybrids: one at the input, and one at the output.
_______________ Detailed Description
This section describes the circuitry surrounding the IC in the MAX2470/MAX2471 EV kits. For more detailed information about the device operation, please consult the MAX2470/MAX2471 data sheet. Figure 1 is the schematic for the MAX2470/MAX2471 EV kits. Capacitors C1, C2, C3, and C4 are 2200pF DCblocking capacitors; this value contributes minimal reactance to the signal paths, down to 10MHz. Capacitors C5 and C6 form the VCC decoupling network. Note the location of each component; a relatively large 10F tantalum capacitor, C6, is located near the VCC connector. Near to C6, a much smaller 2200pF decoupling capacitor, C5, reduces any high-frequency interference. The EV kit includes pads for R3 and R4 that can facilitate simple termination of the input(s). For the MAX2470 EV kit, R2 and C7 provide high-frequency filtering to prevent excess noise from coupling into the IC. On the MAX2470 EV kit, jumper JU1 selects the state of the HI/LO input on the MAX2470. Selecting the "LO" setting optimizes the MAX2470 for input frequencies from 10MHz to 200MHz. Selecting the "HI" setting optimizes the MAX2470 for input frequencies from 10MHz to 500MHz.
Connections and Setup
1) Verify the DC power supply is set to less than +5.5V and is off before connecting the supply to the EV kit. A good starting point is +3.0V. Connect the power supply between VCC and GND and turn it on. 2) Set the output power of the signal generator to -20dBm at 200MHz. Disable the output, then connect the output of the signal generator to the IN SMA connector of the MAX2470 EV kit board. For the MAX2471, use a balun between the signal generator and the differential inputs (IN and IN).
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MAX2470/MAX2471 Evaluation Kits Evaluate: MAX2470/MAX2471
C5 2200pF C1 2200pF 1 OUT VCC 6 C3 2200pF IN 5
C6 10F
J1 OUT
R3 50 J3 IN
2 C2 2200pF 3
GND
MAX2470 MAX2471
J2 OUT
C4 2200pF OUT IN (HI/LO) 4 J4 R1 0
C7 2200pF
R4 50
IN
VCC
R2 1k JU1 HI/LO GND
( ) ARE FOR MAX2470
Figure 1. MAX2470/MAX2471 EV Kit Schematic
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MAX2470/MAX2471 Evaluation Kits Evaluate: MAX2470/MAX2471
1.0"
Figure 2. MAX2470/MAX2471 EV Kit Component Placement Guide--Component Side
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Figure 3. MAX2470/MAX2471 EV Kit PC Board Layout-- Ground Plane
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Figure 4. MAX2470/MAX2471 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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