MAX1473EVKIT-433 [MAXIM]
Evaluation Kit; 评估套件
| 型号： | MAX1473EVKIT-433 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit |
| 文件： | 总6页 (文件大小：294K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2960; Rev 1; 5/05
MAX1473 Evaluation Kit
General Description
Features
♦ Proven PC Board Layout
The MAX1473 evaluation kit (EV kit) allows for a
detailed evaluation of the MAX1473 superheterodyne
receiver. It enables testing of the device’s RF perfor-
mance and requires no additional support circuitry. The
RF input uses a 50 matching network and an SMA
connector for convenient connection to test equipment.
The EV kit can also directly interface to the user’s
embedded design for easy data decoding.
♦ Proven Components Parts List
♦ Multiple Test Points Provided On-Board
♦ Available in 315MHz or 433.92MHz Optimized
Versions
♦ Adjustable Frequency Range from 300MHz to
The MAX1473 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. In addition, the 5kbps
data rate received can be adjusted from 0 to 100kbps
by changing two more components.
450MHz*
♦ Fully Assembled and Tested
♦ Can Operate as a Stand-Alone Receiver with
Addition of an Antenna
*Requires component changes
For easy implementation into the customer’s design, the
MAX1473 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
28 TSSOP
MAX1473EVKIT-315
MAX1473EVKIT-433
28 TSSOP
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.01µF 10% ceramic capacitors (0603)
Murata GRM188R71H103KA01
15pF 5%, 50V ceramic capacitors
(0603)
C1, C2
2
C14, C15
2
Murata GRM1885C1H150JZ01
1500pF 10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H152KA01
C3
1
0.01µF +80% - 20% ceramic
capacitor (0603), not installed
Murata GRM188R71H103KA01
C17
C21
F_IN
0
1
0
0.47µF +80% - 20% ceramic
capacitor (0603)
Murata GRM188F51C474ZA01
0
resistor (0603)
C4
1
SMA connector edge mount, not
installed
Johnson 142-0701-801
470pF 5% ceramic capacitor (0603)
Murata GRM1885C1H471JA01
C5
1
2
3
1
1
2
0
JU1, JU2, JU5,
JU6
3-pin headers
Digi-Key S1012-36-ND or equivalent
220pF 5% ceramic capacitors (0603)
Murata GRM1885C1H221JA01
4
C6, C10
JU7
JU3, JU4
JU8
1
0
1
2-pin header
Not installed
Shorted
100pF 5% ceramic capacitors (0603)
Murata GRM1885C1H101JA01
C7, C8, C11
C9 (315MHz)
C9 (433MHz)
C12, C20
4pF 0.1pF ceramic capacitor (0603)
Murata GRM1885C1H4R0BZ01
Shunts (JU1)
Digi-Key S9000-ND or equivalent
—
5
1
2.2pF 0.1pF ceramic capacitor (0603)
Murata GRM1885C1H2R2BD01
27nH 5% inductor (0603)
Coilcraft 0603CS-27NXJB
L1 (315MHz)
0.1µF 5% ceramic capacitors (0603)
Murata GRM188R71C104KA01
C13, C16, C18,
C19
Not installed
________________________________________________________________ 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.
MAX1473 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
15nH 5% inductor (0603)
Coilcraft 0603CS-15NXJB
1000pF 10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102KA01
L1 (433MHz)
L2 (315MHz)
L2 (433MHz)
L3
1
1
1
1
R9
1
120nH 5% inductor (0603)
Coilcraft 0603CS-R12XJB
SMA connector top mount
Digi-Key J500-ND
Johnson 142-0701-201
RF IN
1
0
56nH 5% inductor (0603)
Coilcraft 0603CS-56NXJB
TP2, TP4–TP12
Not installed
15nH 5% inductor (0603)
Murata LQG18HN15NJ00
VDD, GND,
SHDN,
DATA_OUT,
TP3
Test points
Mouser 151-203 or equivalent
SMA connector top mount, not installed
Digi-Key J500-ND
Johnson 142-0701-201
5
1
MIX OUT
0
Crystal 4.754687MHz
Hong Kong Crystal
SSL4754687E03FAFZ8A0 or
Crystek 016867
R1
1
0
5.1kΩ resistor (0603), any
R2, R4, R6
Resistor (0603), not installed
Y1 (315MHz)
R3
R5
0
1
270Ω resistor (0603), any, not installed
10kΩ resistor (0603), any
Crystal 6.6128MHz
Hong Kong Crystal
SSL6612813E03FAFZ8A0 or Crystek
016868
10pF 5%, 50V ceramic capacitor (0603)
Murata GRM1885C1H100JZ01
R7
R8
1
1
Y1 (433MHz)
Y2
1
1
10kΩ resistor (0603), any
10.7MHz ceramic filter
Murata SFTLA10M7FA00-B0
Quick Start
The following procedure allows for proper device evalu-
ation.
U1
—
1
1
MAX1473EUI
MAX1473 EV kit PC board
Required Test Equipment
• Regulated power supply capable of providing +3.3V
AM-modulated square wave (or a 2kHz pulse-modu-
lated signal).
• RF signal generator capable of delivering from
-120dBm to 0dBm of output power at the operating
frequency, in addition to AM or pulse-modulation
capabilities (Agilent E4420B or equivalent)
3) Connect the oscilloscope to test point TP3.
4) Turn on the DC supply. The supply current should
read approximately 5mA.
5) Activate the RF generator’s output without modulation.
The scope should display a DC voltage that varies
from approximately 1.2V to 2.0V as the RF generator
amplitude is changed from -115dBm to 0dBm. (Note:
At an input amplitude of around -60dBm, this DC
voltage will drop suddenly to about 1.5V and then
rise again with increasing input amplitude. This is
normal; the AGC is turning on the LNA gain reduc-
tion resistor).
• Optional ammeter for measuring supply current
• Oscilloscope
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 or RF signal generator until all
connections are made:
1) Connect a DC supply set to +3.3V (through an
ammeter, if desired) to the VDD and GND terminals
on the EV kit. Do not turn on the supply.
6) Set the RF generator to -100dBm. Activate the RF
generator’s modulation and set the scope’s coupling
to AC. The scope now displays a lowpass-filtered
square wave at TP3 (filtered analog baseband data).
Use the RF generator’s LF OUTPUT (modulation out-
put) to trigger the oscilloscope.
2) Connect the RF signal generator to the RF_IN SMA
connector. Do not turn on the generator output. Set
the generator for an output frequency of 315MHz (or
433.92MHz) at a power level of -100dBm. Set the
modulation of the generator to provide a 2kHz 100%
7) Monitor the DATA_OUT terminal and verify the pres-
ence of a 2kHz square wave.
2
_______________________________________________________________________________________
MAX1473 Evaluation Kit
for continuous shutdown, or pins 1 and 2 for continuous
operation. Remove the JU1 shunt for external control.
Table 1 describes jumper functions.
Additional Evaluation
1) With the modulation still set to AM, observe the
effect of reducing the RF generator’s amplitude on
the DATA_OUT terminal output. The error in this
sliced digital signal increases with reduced RF sig-
nal level. The sensitivity is usually defined as the
point at which the error in interpreting the data (by
the following embedded circuitry) increases beyond
a set limit (BER test).
Power Supply
The MAX1473 can operate from 3.3V or 5V supplies.
For 5V operation, remove JU7 before connecting the
supply to VDD. For 3.3V operation, connect JU7.
IF Input/Output
The 10.7MHz IF can be monitored with the help of a
spectrum analyzer using the MIX_OUT SMA connector
(not provided). Remove the ceramic filter for such a
measurement and include R3 (270 ) and C17 (0.01µF)
to match the 330 mixer output with the 50 spectrum
analyzer. Jumper JU3 needs to connect pins 1 and 2. It
is also possible to use the MIX_OUT SMA connector to
inject an external IF as a means of evaluating the base-
band data slicing section. Jumper JU3 needs to con-
nect pins 2 and 3.
2) With the above settings, a 315MHz-tuned EV kit
should display a sensitivity of about -117dBm (0.2%
BER) while a 433.92MHz kit displays a sensitivity of
about -115dBm (0.2% BER). Note: The above sensi-
tivity values are given in terms of average peak
power is 3dB higher.
3) Capacitors C5 and C6 are used to set the corner fre-
quency of the 2nd-order lowpass Sallen-Key data fil-
ter. The current values were selected for bit rates up
to 5kbps. Adjusting these values accommodates
higher data rates (refer to the MAX1473 data sheet
for more details).
F_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 F_IN SMA connector (not provid-
ed). Connect the SMA connector to a function genera-
tor. The addition of C18 and C19 is necessary (use
0.01µF capacitors).
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 radia-
tion. At high frequencies, trace lengths that are on the
order of /10 or longer can act as antennas.
AGC Control
Jumper JU5 controls whether the AGC is enabled.
Connect pins 2 and 3 to enable the AGC.
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 10%.
Crystal Select
Jumper JU2 controls the crystal divide ratio.
Connecting pins 1 and 2 sets the divide ratio to 64,
while connecting pins 2 and 3 sets the ratio to 32. This
determines the frequency of the crystal to be used.
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.
Image Rejection Frequency Select
A unique feature of the MAX1473 is its ability to vary at
which frequency the image rejection is optimized. JU6
allows the selection of three possible frequencies:
315MHz, 375MHz, and 433.92MHz. See Table 1 for set-
tings.
The EV kit PC board can serve as a reference design
for laying out a board using the MAX1473. All required
components have been enclosed in a 1.25in ✕ 1.25in
square, which can be directly “inserted” into the appli-
cation circuit.
Test Points and I/O Connections
Additional test points and I/O connectors are provided
to monitor the various baseband signals and for exter-
nal connections. See Tables 2 and 3 for a description.
Detailed Description
For additional information and a list of application
notes, consult the www.maxim-ic.com website.
Power-Down Control
The MAX1473 can be controlled externally using the
SHDN connector. The IC draws approximately 1.25µA
in shutdown mode. Jumper JU1 is used to control this
mode. The shunt can be placed between pins 2 and 3
________________________________________________________________________________________
3
MAX1473 Evaluation Kit
Table 1. Jumper Functions
Table 3. I/O Connectors
SIGNAL
RF_IN
DESCRIPTION
JUMPER
JU1
STATE
1-2
FUNCTION
Normal operation
RF input
F_IN
External reference frequency input
IF input/output
JU1
2-3
Power-down mode
MIX_OUT
GND
JU1
NC
External power-down control
Crystal divide ratio = 32
Crystal divide ratio = 64
Mixer output to MIX_OUT
External IF input
Ground
JU2
2-3
VDD
Supply input
JU2
1-2
DATA_OUT
SHDN
Sliced data output
External power-down control
JU3
1-2
JU3
2-3
JU3
NC
Normal operation
Uses PDOUT for faster receiver
startup
JU4
JU4
1-2
2-3
GND connection for peak detector
filter
JU5
JU5
JU6
JU6
JU6
JU7
JU7
1-2
2-3
1-2
2-3
NC
1-2
NC
Disables AGC
Enables AGC
IR centered at 433MHz
IR centered at 315MHz
IR centered at 375MHz
Connect VDD to +3.3V supply
Connect VDD to +5.0V supply
Table 2. Test Points
TP
DESCRIPTION
Data slicer negative input
2
3
Data filter output
Peak detector out
+3.3V
4
5
Figure 1. MAX1473 EV Kit
6
GND
7
Data filter feedback node
Data out
8
9
Power-down select input
VDD
10
11
12
AGC control
Crystal select
4
_______________________________________________________________________________________
MAX1473 Evaluation Kit
VDD
*
AT 315MHz
4pF
AT 433.92MHz
2.2pF
+3.3V
JU7
C9
L1
L2
Y1
C20
0.1 F
C14
15pF
C15
15pF
C19
OPEN
VDD
27nH
15nH
Y1
*
TP5
120nH
56nH
F_IN
TP10
C16
OPEN
4.754689MHz
6.6128MHz
VDD
C18
OPEN
28
27
26
1
2
XTAL2
1
2
SHDN
TP9
XTAL1
JU1
+3.3V
PWRDN
PDOUT
3
TP4
DSN
1
AV
DD
C13
OPEN
C12
0.1 F
JU4
2
3
R2
OPEN
TP8
L2
*
R5
RF_IN
3
DATA_OUT
10k
LNAIN
25
24
DATAOUT
C7
100pF
4
5
V
V
LNASRC
AGND
DD5
DD
L3
15nH
U1
R7
10pF
C21
0
6
7
MAX1473
LNAOUT
23
+3.3V
DSP
AV
DD
C2
0.01 F
R9
1000pF
R6
OPEN
8
9
MIXIN1
MIXIN2
L1
*
C9
*
JU8
SHORT
C11
100pF
+3.3V
C10
220pF
C8
100pF
22
DFFB
TP7
C6
220pF
21
20
OPP
DSN
DSN
TP2
0.47 F
GND
TP6
C4
TP3
C5
470pF
R1
5.1k
19
18
DFO
+3.3V
1
C3
1500pF
10
AGND
IFIN2
R8
10k
2
11
12
IR_SEL
17
16
IFIN1
JU6
3
MIXOUT
C17
OPEN
XT_SEL
+3.3V
R3
OPEN
3
13
14
MIX_OUT
15
DGND
JU3
2
AGC_OFF
1
3
JU2
2
DV
DD
+3.3V
C1
0.01 F
+3.3V
1
R4
OPEN
1
Y2
10.7MHz
JU5
2
TP12
IN
1
GND OUT
2
3
3
TP11
Figure 2. MAX1473 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1473 Evaluation Kit
Figure 3. MAX1473 EV Kit Component Placement Guide—
Component Side
Figure 4. MAX1473 EV Kit PC Board Layout—Component Side
Figure 5. MAX1473 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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