MAX1472_1 [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX1472_1 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总5页 (文件大小：454K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2907; Rev 1; 11/03
MAX1472 Evaluation Kit
General Description
Features
ꢀ Proven PC Board Layout
The MAX1472 evaluation kit (EV kit) allows for a
detailed evaluation of the MAX1472 ASK transmitter. It
enables testing of the device’s RF performance and
requires no additional support circuitry. The RF output
uses a 50Ω 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.
ꢀ 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*
The MAX1472 EV kit comes in two versions: a 315MHz
version and a 433.92MHz version. The passive compo-
nents are optimized for these frequencies. These com-
ponents can easily be changed to work at RF frequen-
cies from 300MHz to 450MHz.
ꢀ Fully Assembled and Tested
ꢀ Can Operate as a Stand-Alone Transmitter with
Included Battery
*Requires component changes
For easy implementation into the customer’s design, the
MAX1472 EV kit also features a proven PC board lay-
out, which can be easily duplicated for quicker time-to-
market. The EV kit Gerber files are available for down-
load at www.maxim-ic.com.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
IC PACKAGE
8 SOT23-8
MAX1472EVKIT-315
MAX1472EVKIT-433
8 SOT23-8
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
315MHz 1/4 wave whip antenna
Lynx ANT-315-CW-RH,
not installed
22pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H220J
Antenna (315MHz)
0
C2 (315MHz)
1
433MHz 1/4 wave whip antenna
Lynx ANT-433-CW-RH,
not installed
12pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H120J
Antenna (433MHz)
ANTENNA_OUT
0
1
C2 (433MHz)
C3, C10
1
2
0.01µF 10%, 50V ceramic
capacitors (0603)
Murata GRM188R71H103KA01
SMA connector top mount,
not installed
Digi-Key J500-ND
Johnson 142-0701-201
680pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H681J
Battery holder
MPD BA2032
C4
1
0
1
BAT1
1
1
Coin-cell battery
Panasonic BR2032
C5, C16, C18, C19
C6 (315MHz)
Not installed
Battery
15pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H150J
15pF 5%, 50V ceramic
capacitor (0603)
C1 (315MHz)
C1 (433MHz)
1
1
Murata GRM1885C1H150J
10pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H100J
C6 (433MHz)
C7
1
1
7pF 5%, 50V ceramic
capacitor (0603)
Murata GRM1885C1H7R0J
0.47µF +80% - 20%, 16V ceramic
capacitor (0603)
Murata GRM188F51C474Z
________________________________________________________________ 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.
MAX1472 Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
220pF 5%, 50V ceramic
capacitors (0603)
0Ω resistor (0603), any,
not installed
R2
0
C11, C12
2
Murata GRM1885C1H221J
R3
R4
1
1
5.1Ω resistor (0603), any
36kΩ 5% resistor (0603), any
12pF 5%, 50V ceramic
capacitors (0603)
Murata GRM1885C1H120J
C14, C15
2
RP-SMA connector
Lynx CONREVSMA001
REF_IN
RFOUT
SW1
1
2-pin headers
Digi-Key S1012-36-ND
or equivalent
SMA connector top mount
Digi-Key J500-ND
Johnson 142-0701-201
JU1, JU4
JU1
2
3
2
1
Shunts
Switch
Panasonic EVQ-PJS04K
1
4
Digi-Key S9000-ND or equivalent
VDD, VSS,
ENABLE, DATA-IN
Test points
Mouser 151-203 or equivalent
3-pin headers
Digi-Key S1012-36-ND
or equivalent
JU2, JU3
U1
U2
1
1
MAX1472EKA
ICM7555ISA
27nH 5% inductor (0603)
Coilcraft 0603CS-27NXJB
L1 (315MHz)
L1 (433MHz)
L3 (315MHz)
L3 (433MHz)
R1
1
1
1
1
1
Crystal 9.84375 MHz
Hong Kong Crystal
SSL9843750E03FAFZ800 or
Crystek 017000
22nH 5% inductor (0603)
Coilcraft 0603CS-22NXJB
Y1 (315MHz)
1
22nH 5% inductor (0603)
Coilcraft 0603CS-22NXJB
Crystal 13.56MHz
Hong Kong Crystal
SSM1356000E03FAFZ800 or
Crystek 017001
15nH 5% inductor (0603)
Coilcraft 0603CS-15NXJB
Y1 (433MHz)
1
1
5kΩ potentiometer
BC Components SM4W502
—
MAX1472 EV kit PC board
Connections and Setup
Component Suppliers
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:
SUPPLIER
PHONE
FAX
Coilcraft
800-322-2645
800-237-3061
852-2412 0121
800-831-9172
847-639-1469
941-561-1025
852-2498 5908
814-238-0490
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.
Crystek
Hong Kong Crystal
Murata
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.
Quick Start
The following procedure allows for proper device
evaluation.
3) Turn on the DC supply. The spectrum analyzer
should display a peak of about +10dBm at 315MHz
(or 433.92MHz).
Required Test Equipment
• Regulated power supply capable of providing +3.0V
4) Disconnect the spectrum analyzer and connect the
power meter instead. Measure the output power and
also the current draw.
• Spectrum analyzer such as the Agilent 8562E
• Optional ammeter for measuring supply current
• Power meter such as the Agilent EPM-441A
2
_______________________________________________________________________________________
MAX1472 Evaluation Kit
5) Calculate the efficiency. This is done using the fol-
lowing equation:
Data Input
The MAX1472 EV kit transmits ASK data with data rates
up to 100kbps. JU2 controls whether the MAX1472
transmits CW (jumper pins 1 and 2 connected), an
external data stream (no jumper), or train pulses gener-
ated by the ICM7555 timer (jumper pins 2 and 3 con-
nected). JU4 controls whether the ICM7555 data is
being generated continuously or at the push of SW1.
Efficiency = 10 ^ (Pout / 10) / (V x I)
where I is in mA.
For example, the efficiency is 46.6% for an output of
+11dBm, and a current of 9mA (at 3.0V).
Layout Issues
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 0.01µF
capacitors).
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 radia-
tion. At high frequencies, trace lengths that are on the
order of λ/10 or longer can act as antennas.
Keeping the traces short also reduces parasitic induc-
tance. 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 induc-
tor adds an extra 10nH of inductance or 10%.
Battery Operation
The MAX1472 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.
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.
RF Output
The MAX1472 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
50Ω. ANTENNA_OUT is a reverse polarity SMA and is
used to connect to a 1/4 wave whip antenna . Note that
resistor R2 (0Ω) needs to be added.
The EV kit PC board can serve as a reference design
for laying out a board using the MAX1472.
I/O Connections
Detailed Description
Table 2 lists all I/O connections.
Enable Control
The MAX1472 can be controlled externally using the
ENABLE connector. The IC draws approximately 1nA
(at room temperature) in shutdown mode. Jumper JU1
is used to control this mode. The shunt can be placed
between pins 1 and 2 for continuous operation.
Remove the JU1 shunt for external control. See Table 1
for jumper function descriptions.
Table 2. I/O Connectors
SIGNAL
RFOUT
REF_IN
DESCRIPTION
RF output
External reference frequency input
Reverse polarity SMA for 1/4 wave
antenna
ANTENNA_OUT
Table 1. Jumper Functions
VSS
VDD
Ground
JUMPER
JU1
STATE
1-2
FUNCTION
Normal operation
3.0V power input
Data input
DATA_IN
ENABLE
JU1
NC
External power-down control
RF carrier-transmit mode
Transmit pulse-train mode
External data transmit
External power-down control
JU2
1-2
JU2
2-3
For additional information and a list of application
notes, consult the Maxim website, www/maxim-ic.com.
JU2
NC
JU3
1-2
External supply operation
Battery operation
JU3
2-3
JU4
1-2
Continuous data generation
Data controlled by SW1
JU4
NC
_______________________________________________________________________________________
3
MAX1472 Evaluation Kit
Figure 1. MAX1472 EV Kit
50Ω OUTPUT
Y1
*
C14
12pF
C15
12pF
C19
OPEN
AT 315MHz AT 433.92MHz
*
C1
15pF
22pF
15pF
27nH
22nH
7pF
REF_IN
1
C2
C6
L1
L3
12pF
10pF
22nH
15nH
2
C16
OPEN
Y1 9.84375MHz 13.56MHz
*VALUES AFFECTED BY PC BOARD LAYOUT.
1
8
XTAL1
XTAL2
VDD
C5
VDD
C18
OPEN
VDD
OPEN
VSS
R3
2
3
5.1Ω
V
SS
7
6
R1
5kΩ
V
JU3
DD
C7
0.47µF
C11
220pF
C10
PAV
U1
SS
0.01µF
1
2
DATA_IN
V+
BAT1
JU2
DATA
MAX1472
C4
680pF
C12
3
VDD
220pF
L1
*
1
GND
C1
*
8
7
JU1
ENABLE
4
PA
5
TRIGGER
C2
*
ENABLE
2
3
4
TRIGGER DISCHARGE
L3
*
U2
R4
36kΩ
ICM7555
RFOUT
ANTENNA_OUT
1
TRIGGER
TRIGGER
6
5
OUTPUT THRESHOLD
2
R2
0Ω
C3
0.01µF
VDD
C6
*
SW1
CONTROL
RESET
VOLTAGE
JU4
Figure 2. MAX1472 EV Kit Circuit Diagram
_______________________________________________________________________________________
4
MAX1472 Evaluation Kit
Figure 4. MAX1472 EV Kit PC Board Layout—Top Copper
Figure 3. MAX1472 EV Kit Component Placement Guide—Top
Silkscreen
Figure 5. MAX1472 EV Kit PC Board Layout—Bottom Copper
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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