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19-3615; Rev 0; 3/05
MAX7044 Evaluation Kit
General Description
The MAX7044 evaluation kit (EV kit) allows for a detailed evaluation of the MAX7044 ASK transmitter. It enables testing of the device's RF performance and requires no additional support circuitry. The RF output uses a 50 matching network and an SMA connector for convenient connection to test equipment. A reverse polarity SMA is also included to connect to a 1/4-wave whip antenna. The EV kit can also directly interface to the user's embedded design for easy data encoding. The MAX7044EV kit comes in two versions: a 315MHz version and a 433.92MHz version. The passive components are optimized for these frequencies. These components can easily be changed to work at RF frequencies from 300MHz to 450MHz. For easy implementation into the customer's design, the MAX7044 EV kit also features a proven PC board layout, which can be easily duplicated for quicker time-tomarket. The EV kit Gerber files are available for download at www.maxim-ic.com. Proven PC Board Layout Proven Components Parts List Multiple Test Points Provided on Board Available in 315MHz or 433.92MHz Optimized Versions Adjustable Frequency Range from 300MHz to 450MHz* Fully Assembled and Tested Can Operate as a Stand-Alone Transmitter with Included Battery
*Requires component changes
Features
Evaluates: MAX7044
Ordering Information
PART MAX7044EVKIT-315 MAX7044EVKIT-433 TEMP RANGE -40C to +85C -40C to +85C IC PACKAGE 8 SOT23-8 8 SOT23-8
Component List
DESIGNATION C1 (315MHz) QTY 1 DESCRIPTION 12pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H120J 10.0pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H100J 18pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H180J 15pF 5%, 50V ceramic capacitors (0603) Murata GRM1885C1H150J 0.01F 10%, 50V ceramic capacitors (0603) Murata GRM188R71H103KA01 Not installed, capacitors L3 (315MHz) 1 15pF 5%, 50V ceramic capacitor (0603) Murata GRM1885C1H150J L3 (433MHz) R1 1 1 1 DESIGNATION C11, C12 QTY 2 DESCRIPTION 220pF 5%, 50V ceramic capacitors (0603) Murata GRM1885C1H221J 12pF 5%, 50V ceramic capacitors (0603) Murata GRM1885C1H120J 2-pin header Digi-Key S1012-36-ND or equivalent 3-pin headers Digi-Key S1012-36-ND or equivalent 27nH 5% inductor (0603) Coilcraft 0603CS-27NXJB 13nH 5% inductor (0603) Murata LGW18AN13NG00 18nH 5% inductor (0603) Coilcraft 0603CS-18NXJB 11nH 5% inductor (0603) Coilcraft 0603CS-11NXJB 5k potentiometer BC Components SM4W502
C1 (433MHz)
1
C14, C15
2
C2 (315MHz)
1
JU1
1
C2, C6 (433MHz)
2
JU2, JU3
2
L1 (315MHz) L1 (433MHz)
1 1
C4, C10 C5, C7, C16, C18, C19 C6 (315MHz)
2
0
________________________________________________________________ Maxim Integrated Products
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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.
MAX7044 Evaluation Kit Evaluates: MAX7044
Component List (continued)
DESIGNATION R2 R3 R5 R6 R7 QTY 0 1 1 1 1 DESCRIPTION Not installed, 0 resistor (0603), any 0 resistor (0603), any 47k 5% resistor (0603), any 15k 5% resistor (0603), any 33k 5% resistor (0603), any SMA connector, top-mount Digi-Key J500-ND Johnson 142-0701-201 RP-SMA connector LINX CONREVSMA001 SMA connector, top-mount, Digi-Key J500-ND Johnson 142-0701-201 315MHz 1/4-wave whip antenna, not provided Linx ANT-315-CW-RH BAT1 Battery U1 None None 1 1 1 3 1 CLKOUT, VDD, VSS, DATA_IN 4 DESIGNATION Antenna (433MHz) QTY 0 DESCRIPTION 433MHz 1/4-wave whip antenna, not provided Lynx ANT-433-CW-RH Test points Mouser 151-203 or equivalent Crystal, 9.84375MHz Hong Kong Crystals SSL9843750E03FAFZ800 or Crystek 017000 Crystal, 13.56MHz Hong Kong Crystal SSM1356000E03FAFZ800 or Crystek 017001 Battery holder MPD BA2032 Coin-cell battery Panasonic BR2032 MAX7044AKA-T (8-pin SOT23) Shunts (JU1) Digi-Key S9000-ND or equivalent MAX7044 EV kit PC board
Y1 (315MHz)
1
RFOUT
1
Y1 (433MHz)
1
ANTENNA_OUT
1
REF_IN
1
Antenna (315MHz)
0
Component Suppliers
SUPPLIER Coilcraft Crystek Hong Kong Crystal Murata PHONE 800-322-2645 800-237-3061 852-2412 0121 800-831-9172 FAX 847-639-1469 941-561-1025 852-2498 5908 814-238-0490
Connections and Setup
This section provides a step-by-step guide to operating the EV kit and testing the device's functionality. Do not turn on the DC power until all connections are made: 1) Connect a DC supply set to +3.0V, through an ammeter, to the VDD and VSS terminals on the EV kit. Do not turn on the supply. 2) Connect the RF OUT SMA connector to the spectrum analyzer. Set the analyzer to a center frequency of 315MHz (or 433.92MHz) and a span of 1MHz. 3) Turn on the DC supply. The spectrum analyzer should display a peak of about +13dBm at 315MHz (or 433.92MHz). 4) Disconnect the spectrum analyzer and connect the power meter instead. Measure the output power and also the current draw. Calculate the efficiency. This is done using the following equation: Efficiency = 10^(POUT / 10) / (V x I). 5) For example, for an output of +13dBm, and a current of 14.5mA (at 3.0V), the efficiency is 46%. 6) In order to transmit ASK data, remove the shunts at JU1 and JU2, and connect DATA_IN to an external data source.
Note: Indicate that you are using the MAX7044 when contacting these component suppliers.
Quick Start
The following procedure allows for proper device evaluation.
Required Test Equipment
* One regulated power supply capable of providing +3.0V * One spectrum analyzer such as the Agilent 8562E * One optional ammeter for measuring supply current * One power meter such as the Agilent EPM-441A
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MAX7044 Evaluation Kit
Layout Issues
A properly designed PC board is an essential part of any RF/microwave circuit. On high-frequency inputs and outputs, use controlled-impedance lines and keep them as short as possible to minimize losses and radiation. At high frequencies, trace lengths that are on the order of /10 or longer can act as antennas. Keeping the traces short also reduces parasitic inductance. Generally, 1in of a PC board trace adds about 20nH of parasitic inductance. The parasitic inductance can have a dramatic effect on the effective inductance. For example, a 0.5in trace connecting a 100nH inductor adds an extra 10nH of inductance or 10%. To reduce the parasitic inductance, use wider traces and a solid ground or power plane below the signal traces. Also, use low-inductance connections to ground on all GND pins, and place decoupling capacitors close to all VDD connections. The EV kit PC board can serve as a reference design for laying out a board using the MAX7044.
Data Input
The MAX7044EV kit transmits ASK data with data rates of up to 100kbps. JU1 and JU2 control whether the MAX7044 transmits CW (JU1 shorted, JU2 pins 1 and 2 connected), or an external data stream (no jumper).
Evaluates: MAX7044
REF_IN External Frequency Input
For applications where the correct frequency crystal is not available, it is possible to directly inject an external frequency through the REF_IN SMA (not provided). Connect the SMA to a low-phase noise generator. The addition of C18 and C19 is necessary (use 0.01F capacitors).
Battery Operation
The MAX7044 EV kit can be powered by an external power supply or by the supplied 3V coin-cell battery. Set jumper JU3 to connect pins 2 and 3 for battery operation.
RF Output
The MAX7044 EV kit includes two SMA connectors for RF output. RFOUT is a standard SMA and is used to connect the PA output to test equipment. Output is matched to 50. ANTENNA_OUT is a reverse-polarity SMA and is used to connect to the 1/4-wave whip antenna (not supplied). Note that resistor R2 (0) will need to be added.
Detailed Description
Power-Down Control
The MAX7044 has an automatic shutdown mode that places the device in low-power mode if the DATA input has not toggled for a specific amount of time. The IC draws approximately 40nA (at room temperature) in shutdown mode. In order to transmit continuously, the device has to be placed in test mode by biasing the DATA pin to VDD/2 + 100mV. Jumpers JU1 and JU2 are used to control this mode. Connect the shunt between pins 1 and 2 of JU1 and pins 1 and 2 of JU2. See Table 1 for the jumper function descriptions.
I/O Connections
Table 2 lists all I/O connections. See Table 2 for a description.
Table 2. I/O Connectors
SIGNAL RFOUT REF_IN ANTENNA_OUT VSS VDD DATA_IN CLKOUT RF output External reference frequency input Reverse polarity SMA for 1/4-wave antenna Ground 3.0V power input Data input Crystal frequency divided by 16 DESCRIPTION
Table 1. Jumper Function Table
JUMPER JU1 JU1 JU2 JU2 JU2 JU3 JU3 STATE 1-2 NC 1-2 2-3 NC 1-2 2-3 FUNCTION RF carrier transmit mode Normal OOK operation RF carrier transmit mode PA off, PLL ON External OOK data transmit External supply operation Battery operation
For additional information and a list of application notes, consult the www.maxim-ic.com website.
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MAX7044 Evaluation Kit Evaluates: MAX7044
C14 12pF C15 12pF C19 OPEN
Y1
REF_IN
C16 OPEN
VDD 1 C18 OPEN 2 VSS VDD 3 PAVSS 7 C7 OPEN C11 220pF XTAL1 XTAL2 8 C5 OPEN R3 0 C10 0.01F VDD VDD JU1
VSS
VDD 1 R1 2 3
1 2 JU3 3 BAT1
R7 33k R6 15k 1 2 JU2 3 DATA_IN
U1 MAX7044
DATA 6
C4 0.01F
C12 220pF C1
R5 47k
L1 4
PA CLKOUT 5 CLKOUT * C1 C2 C6 L1 L3 Y1
50 OUTPUT 315MHz 12pF 18pF 15pF 27nH 18nH 9.84375MHz 433MHz 10pF 15pF 15pF 13nH 11nH 13.56MHz
C2 L3 R2 0 C6
RFOUT 1 2
ANTENNA_OUT 1 2
* VALUE AFFECTED BY PC BOARD LAYOUT
Figure 1. MAX7044 EV Kit Schematic
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MAX7044 Evaluation Kit Evaluates: MAX7044
Figure 3. MAX7044 EV Kit PC Board Layout--Component Side
Figure 2. MAX7044 EV Kit Component Placement Guide-- Component Side
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MAX7044 Evaluation Kit Evaluates: MAX7044
Figure 4. MAX7044 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) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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