MAX1479EVKIT-433 [MAXIM]
Evaluation Kit; 评估套件型号: | MAX1479EVKIT-433 |
厂家: | MAXIM INTEGRATED PRODUCTS |
描述: | Evaluation Kit |
文件: | 总6页 (文件大小:121K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
19-3726; Rev 0; 5/05
MAX1479 Evaluation Kit
General Description
Features
♦ Proven PC Board Layout
The MAX1479 evaluation kit (EV kit) allows for a detailed
evaluation of the MAX1479 ASK/FSK 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 polar-
ity 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 MAX1479EV kit comes in two versions: a 315MHz
version and a 433.92MHz version. The passive compo-
nents are optimized for these frequencies. These compo-
nents can easily be changed to work at RF frequencies
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
MAX1479EV kit also features a proven PC board layout,
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
16 Thin QFN
16 Thin QFN
MAX1479EVKIT-315
MAX1479EVKIT-433
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.47µF +80/-20ꢀ, 16V ceramic
capacitors (0603) Y5V
Murata GRM188F51C474Z
15pF 5ꢀ, 50V ceramic capacitors
(0603)
Murata GRM1885C1H150J
C1, C6
2
C7, C9
2
3
1
1
2
(315MHz)
220pF 5ꢀ, 50V ceramic capacitors
(0603)
Murata GRM1885C1H221J
6.8pF 0.5pF, 50V ceramic capacitors
(0603) C0G
Murata GRM1885C1H6R8D
C1, C6
2
C8, C11, C12
C13 (315MHz)
C13 (433MHz)
C14, C15
(433MHz)
2.2pF 0.5pF, 50V ceramic capacitor
(0603) C0G
Murata GRM1885C1H2R2D
22pF 5ꢀ, 50V ceramic capacitor
(0603) C0G
Murata GRM1885C1H220J
C2 (315MHz)
C2 (433MHz)
C3, C10
1
1
2
1.0pF 0.5pF, 50V ceramic capacitor
(0603) C0G
Murata GRM1885C1H1R0D
10pF 5ꢀ, 50V ceramic capacitor
(0603) C0G
Murata GRM1885C1H100J
100pF 5ꢀ, 50V ceramic capacitors
(0603)
0.01µF 10ꢀ, 50V ceramic capacitors
(0603)
Murata GRM1885C1H101J
Murata GRM188R71H103KA01
3-pin headers
Digi-Key S1012-36-ND or equivalent
680pF 5ꢀ, 50V ceramic capacitor
(0603) C0G
Murata GRM1885C1H681J
JU1–JU10
L1 (315MHz)
L1 (433MHz)
10
1
C4
1
0
27nH 5ꢀ inductor (0603)
Coilcraft 0603CS-27NXJB
C5, C16,
C18, C19
Not installed
22nH 5ꢀ inductor (0603)
Coilcraft 0603CS-22NXJB
1
________________________________________________________________ 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.
MAX1479 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
SMA connector top mount, not installed
Digi-Key J500-ND
Johnson 142-0701-201
22nH 5ꢀ inductor (0603)
Coilcraft 0603CS-22NXJB
L2 (315MHz)
1
1
1
0
REF_IN
1
18nH 5ꢀ inductor (0603)
Coilcraft 0603CS-18NXJB
L2 (433MHz)
SMA connector top mount
Digi-Key J500-ND
Johnson 142-0701-201
RF_OUT
U1
1
1
5kΩ potentiometer
BC Components SM4W502
R1
R2
MAX1479ATE
0Ω resistor (0603), any,
not installed
VDD, VSS,
ENABLE,
DATA_IN,
CKOUT
Test points
Mouser 151-203 or equivalent
R3
R4
1
1
5.1Ω 5ꢀ resistor (0603), any
0Ω resistor (0603), any
5
1
1
315MHz 1/4-wave whip antenna,
not provided
Lynx ANT-315-CW-RH
Antenna
(315MHz)
0
1
Crystal 9.84375MHz
Hong Kong Crystal
SSL9843750E03FAFZ800 or
Crystek 017000
Y1 (315MHz)
Y1 (433MHz)
433MHz 1/4-wave whip antenna,
not provided
Lynx ANT-433-CW-RH
Antenna
(433MHz)
Crystal 13.56MHz
Hong Kong Crystal
SSM1356000E03FAFZ800 or
Crystek 017001
RP-SMA connector
Linx CONREVSMA001
ANTENNA_OUT
BAT1
1
1
1
Battery holder
MPD BA2032
Shunt (JU1)
Digi-Key S9000-ND or equivalent
—
—
10
1
Coin-cell battery
Panasonic BR2032
Battery
MAX1479 EV kit PC board
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:
Component Suppliers
SUPPLIER
Coilcraft
PHONE
FAX
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.
2) Connect the RF_OUT SMA connector to the spec-
trum 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 +10dBm 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.
Crystek
Hong Kong Crystal
Murata
Note: Indicate you are using the MAX1479 when contacting
these manufacturers.
Quick Start
The following procedure allows for proper device
evaluation.
Required Test Equipment
•
•
•
•
Regulated power supply capable of providing +3.0V
Spectrum analyzer such as the Agilent 8562E
Optional ammeter for measuring supply current
Power meter such as the Agilent EPM-441A
5) Calculate the efficiency. This is done using the
following equation:
(P
/10)/(V x I)
Efficiency = 10ˆ OUT
For example, for a +10.8dBm output, and a
10.9mA (at 3.0V) current, the efficiency is 37ꢀ.
2
_______________________________________________________________________________________
MAX1479 Evaluation Kit
Data Input
The MAX1479 EV kit transmits ASK and FSK data with
data rates of up to 100kbps (ASK) or 20kbps (FSK).
JU2 controls whether the MAX1479 transmits the ASK
carrier frequency (or the FSK high frequency), turns off
the PA (or transmits the FSK low frequency), or trans-
mits an external data stream. See Table 1.
Layout Issues
A properly designed PC board is an essential part of any
RF/microwave circuit. On high-frequency inputs and out-
puts, 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
λ/10 or longer can act as antennas.
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).
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 inductor
adds an extra 10nH of inductance or 10ꢀ.
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.
Battery Operation
The MAX1479 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.
The EV kit PC board can serve as a reference design
for laying out a board using the MAX1479.
RF Output
The MAX1479 EV kit includes two SMA connectors for
RF output. RF_OUT 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 the 1/4-wave whip
antenna (not supplied). Note that resistor R2 (0Ω)
needs to be added.
Detailed Description
Power-Down Control
The MAX1479 can be controlled externally using the
ENABLE connector. The IC draws approximately 0.2nA
(at room temperature) in shutdown mode. Jumper JU1
is used to control this mode. The shunt can be placed
between pins 1 and 2 to enable the device. Remove
the JU1 shunt for external control. See Table 1 for
jumper function descriptions.
Modulation Mode Input
Jumper JU4 sets the mode of transmission. Set jumper
JU4 to connect pins 1 and 2 for FSK mode, 2 and 3 for
ASK mode.
FSK Frequency Deviation
The FSK deviation is set by jumpers JU5 through JU7.
The maximum deviation depends on the PC board para-
sitics. The EV kit max is around 50kHz (315MHz). If very
large FSK frequency deviations are desired, use a crystal
with a larger motional capacitance and/or reduce PC
board parasitic capacitances. One way to reduce para-
sitic capacitances on the EV kit is to remove C14, C15,
and C16 and move the crystal closer to the IC.
Table 1. JU1 Through JU4 Jumpers
Function
JUMPER
STATE
1-2
FUNCTION
RF carrier transmit enable
Power-down mode
JU1
2-3
N.C.
External power-down control
RF carrier transmit mode (ASK),
FSK high frequency (FSK)
1-2
2-3
JU2
PA off, PLL ON (ASK),
FSK low frequency (FSK)
N.C.
1-2
2-3
1-2
2-3
External data transmit
External supply operation
Battery operation
FSK mode
JU3
JU4
ASK mode
_______________________________________________________________________________________
3
MAX1479 Evaluation Kit
Table 2. Clock-Divider Settings
JUMPER
SETTING
1-2
JUMPER
SETTING
1-2
JUMPER
SETTING
1-2
FUNCTION
Max deviation
1-2
1-2
2-3
7/8 x max deviation
3/4 x max deviation
5/8 x max deviation
1/2 x max deviation
3/8 x max deviation
1/4 x max deviation
1/8 x max deviation
1-2
2-3
1-2
1-2
2-3
2-3
JU5
JU6
JU7
2-3
1-2
1-2
2-3
1-2
2-3
2-3
2-3
1-2
2-3
2-3
2-3
Clock Output
I/O Connections
Jumpers JU8 and JU9 set the divider ratio for the clock
output. See Table 3 for the settings.
Table 5 is a list of all I/O connections.
Table 5. I/O Connectors
Table 3. Clock Divider Settings
SIGNAL
RF_OUT
REF_IN
DESCRIPTION
JUMPER SETTING JUMPER SETTING
FUNCTION
RF output
1-2
1-2
2-3
1-2
2-3
1-2
f
f
f
/16
/8
XTAL
XTAL
XTAL
External reference frequency input
ANTENNA_OUT Reverse polarity SMA for 1/4-wave antenna
JU8
JU9
/4
VSS
Ground
VDD
Power-supply input
Data input
Logic 0
output
2-3
2-3
DATA_IN
ENABLE
CLKOUT
Power-down control
Buffered clock output
Envelope Shaping
Jumper JU10 sets envelope shaping for a more gentle
turn-on/turn-off of the PA in ASK mode. Set jumper
JU10 to connect pins 2 and 3 to allow for envelope
shaping. See Table 4 for settings.
For additional information and a list of application
notes, consult the www.maxim-ic.com website.
Table 4. JU10 Jumper Function
JUMPER
STATE
1-2
FUNCTION
No envelope shaping
Envelope shaping
JU10
2-3
4
_______________________________________________________________________________________
MAX1479 Evaluation Kit
C14
100pF
C15
100pF
C19
OPEN
50Ω OUTPUT
AT 315MHz
REF_IN
1
Y1*
*
AT 433.92MHz
6.8pF
2
C1
C2
C6
C13
15pF
22pF
10pF
C16
OPEN
15pF
6.8pF
2.2pF
1.0pF
†
L1
27nH
22nH
†
L2
22nH
18nH
14
15
16
1
Y1
9.84375MHz
13.56MHz
XTAL1
MODE
DIN
XTAL2
GND
†
USE WIRE-WOUND INDUCTORS ONLY.
C18
OPEN
C5
OPEN
VDD
VSS
1
2
3
JU4
2
U1
VDD
VDD
R3
MAX1479
5.1Ω
1
2
3
JU3
VDD
V
DD
C7
0.47µF
C11
220pF
C10
0.01µF
1
2
DATA_IN
ENABLE
CKOUT
JU2
3
BAT1
3
R4
0Ω
6
VDD_PA
ROUT
C9
0.47µF
C8
220pF
C3
0.01µF
VDD
1
2
3
JU10
1
2
JU1
4
R1
5kΩ
ENABLE
CLKOUT
3
7
3
1
C12
220pF
C4
680pF
2
L1*
C1*
L2*
RF_OUT
1
5
8
PAOUT
2
C13*
C2*
C6*
CLK0
9
CLK1
10
VDD
DEV0
11
DEV1
12
VDD
DEV2
13
R2
OPEN
VDD
ANTENNA_OUT
1
JU9
JU7
1
JU5
1
2
1
2
3
2
3
2 3
VDD
JU8
VDD
JU6
1
2
3
1 2 3
Figure 1. MAX1479 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1479 Evaluation Kit
Figure 3. MAX1479 EV Kit PC Board Layout—Component Side
Figure 2. MAX1479 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX1479 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
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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