MAX7042EVKIT-433+ [MAXIM]
Available in 315MHz or 433.92MHz Optimized Versions;
| 型号： | MAX7042EVKIT-433+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Available in 315MHz or 433.92MHz Optimized Versions |
| 文件： | 总7页 (文件大小：1209K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX7042 Evaluation Kit
Evaluates: MAX7042
General Description
Features
S Proven PCB Layout
The MAX7042 evaluation kit (EV kit) allows for a detailed
evaluation of the MAX7042 superheterodyne receiver.
It enables testing of the device’s RF performance and
requires no additional support circuitry. The RF input
circuit is designed to work with a 50I source imped-
ance RF signal generator and has 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.
S Proven Components Parts List
S Multiple Test Points Provided On Board
S Available in 315MHz or 433.92MHz Optimized
Versions
S 308MHz and 418MHz Operation Possible by
Changing Components
S Fully Assembled and Tested
The MAX7042 EV kit comes in two versions, a 315MHz
version and a 433.92MHz version. The passive com-
ponents are optimized for these frequencies. These
components can be changed to work at 308MHz and
418MHz. In addition, the 4kbps Manchester received
data rate can be adjusted from 0kbps to 33kbps by
changing two more components.
S Can Operate as a Stand-Alone Receiver with the
Addition of an Antenna
Ordering Information
PART
TYPE
EV Kit
EV Kit
For easy implementation into the customer’s design, the
MAX7042 EV kit also features a proven PCB layout that
can be duplicated easily for quicker time to market. The
EV kit Gerber files are available upon request.
MAX7042EVKIT-315+
MAX7042EVKIT-433+
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.01FF Q10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103K
220pF Q10%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H221K
C1, C20, C21
C2, C22
3
2
C11, C18
C12
2
1
3
1
0.1FF Q10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
1500pF Q10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H152K
15pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H150J
0.047FF Q10% 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H473K
C14, C15,
C16
C3, C4
2
0
3
C5, C6, C13,
C19
Not installed, ceramic capacitors
(0603)
470pF Q5% 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H471JA01
C17
100pF Q5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H101J
C7, C8, C9
GND, TP8
JU1, JU4–JU11
JU2, JU3
2
9
0
1
Black miniature test points
3-pin headers
Not installed, 3-pin headers
2-pin header
315MHz:
1.2pF Q0.1pF, 50V C0G ceramic
capacitor (0603)
JU12
315MHz:
82nH Q5% inductor (0603)
Coilcraft 0603CS-82NXJLU
Murata GRM1885C1H1R2B
C10
1
433.92MHz:
Not installed, ceramic capacitor
(0603)
L1
1
433.92MHz:
39nH Q 5% inductor (0603)
Coilcraft 0603CS-39NXJLU
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4963; Rev 0; 9/09
MAX7042 Evaluation Kit
Evaluates: MAX7042
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
TP1–TP7, VDD
U1
8
1
Red miniature test points
315MHz:
3.9nH Q5% inductor (0603)
Coilcraft 0603CS-3N9XJLU
Low-power, FSK superheterodyne
receiver (32 TQFN-EP*)
Maxim MAX7042ATJ+
L2
L3
1
1
433.92MHz:
0I Q5% resistor (0603)
315MHz:
9.509375MHz crystal
Crystek 017034
315MHz:
30nH Q5% inductor (0603)
Murata LQW18AN30NJ00
Y1
Y2
1
1
433.92MHz:
13.2256MHz crystal
Crystek 017035
433.92MHz:
16nH Q5% inductor (0603)
Murata LQW18AN16NJ00
10.7MHz ceramic filter
TOKO #SK107M1N-AO-10
R1, R5
0
3
Not installed, resistors (0603)
R2, R3, R4
100kI Q5% resistors
—
—
9
1
Shunts
REF_IN,
MIXOUT
Not installed, SMA female vertical-
mount connectors
PCB: MAX7042 EVALUATION KIT+
0
1
*EP = Exposed pad.
RF_IN
SMA female vertical-mount connector
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Coilcraft, Inc.
847-639-6400
800-237-3061
770-436-1300
847-297-0070
www.coilcraft.com
Crystek Corporation
www.crystek.com
Murata Electronics North America, Inc.
TOKO America, Inc.
www.murata-northamerica.com
www.tokoam.com
Note: Indicate that you are using the MAX7042 when contacting these component suppliers.
1) Verify that the jumpers are in their default position,
Quick Start
Required Equipment
as shown in Table 1.
2) Connect a DC supply set to 3.3V (through an amme-
ter, if desired) to the VDD and GND terminals on the
EV kit. Do not turn on the power supply.
•ꢀ MAX7042 EV kit
•ꢀ Regulated power supply capable of providing 3.3V
•ꢀ RF signal generator capable of delivering -120dBm
to 0dBm output power at the operating frequency, in
addition to frequency modulation (FM) capabilities
(Agilent E4420B or equivalent)
3) Connect the RF signal generator to the RF_IN SMA
connector. Do not turn on the generator output.
Set the generator for an output carrier frequency
of 315MHz (or 433.92MHz) at a power level of
-100dBm. Set the modulation of the generator to
provide a FSK signal with 50kHz frequency devia-
tion modulated with a 4kHz square wave.
•ꢀ Optional ammeter for measuring supply current
•ꢀ Oscilloscope
Procedure
The MAX7042 EV kit is fully assembled and test-
ed. Follow the steps below to verify board operation.
Caution: Do not turn on the DC power supply or RF
signal generator until all connections are completed.
4) Connect the oscilloscope to test point TP6 (DS+ or
data slicer positive input). Set the oscilloscope to
AC-coupling and set the vertical scale to approxi-
mately 100mV/div.
2
Maxim Integrated
MAX7042 Evaluation Kit
Evaluates: MAX7042
5) Turn on the DC supply. The supply current should
read approximately 7.2mA for an EV kit that is set for
maximum sensitivity (JU4 pins 1-2 connected). To
draw slightly less current, with slightly less sensitiv-
ity, connect JU4 pins 2-3.
should be below -107dBm. In some cases, the sen-
sitivity can be improved by removing the ammeter.
8) Move the scope probe to TP3 (DATA), change the
coupling on the scope back to DC, and set the verti-
cal scale to 1V/div or 2V/div. A 4kHz square wave
going from ground to VDD (3.3V in this case) should
be seen. As the RF power is increased, this square
wave becomes cleaner. Another way to estimate
sensitivity from this test point is to reduce the RF
power until the square wave becomes extremely
asymmetric (duty cycle not 50%) and contains short-
data transitions (glitches) in the middle of a data
interval. This power level should be below -107dBm,
similar to the level seen in the previous step.
6) Remove the shunt from JU7 momentarily and restore
it to the 1-2 position. JU7 is the enable input and
toggling it once ensures that the FSK demodulator
is calibrated and operational.
7) Activate the RF generator’s output with modulation
and observe TP6 on the scope. Use the RF gen-
erator’s LF OUTPUT (modulation output) to trigger
the oscilloscope. The scope should show a 200mV
to 250mV peak-to-peak, lowpass-filtered square
wave. If the RF power is turned off, the scope trace
shows a noise voltage with high-amplitude and
high-frequency characteristics. These are the clicks
that characterize the response of an FM demodula-
tor to noise. To estimate the sensitivity, reduce the
RF power to a level where the square wave on the
scope is noisy but recognizable. This power level
Layout Issues
A properly designed PCB is essential for any RF/micro-
wave circuit. Keep high-frequency input and output lines
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.
Table 1. Jumper Table
SHUNT
SHUNT
POSITION
JUMPER
DESCRIPTION
JUMPER
JU7
DESCRIPTION
POSITION
1-2*
2-3
Connects AVDD to VDD3
Connects AVDD to TP1
Not populated, leave open
Not populated, leave open
Selects high sensitivity
1-2*
Turns on the MAX7042
JU1
2-3
Puts the MAX7042 in shutdown
Connects HVIN to VDD
Connects HVIN to TP4
JU2
JU3
—
1-2*
JU8
—
2-3
1-2*
2-3
1-2*
Connects DVDD to VDD3
Connects DVDD to TP5
No peak-detector operation
JU4
JU5
JU9
Selects normal sensitivity
2-3
1-2*
Connects FSEL2 to VDD
(default for 433.92MHz); see
Table 2.
1-2
2-3
JU10
Use peak detector for faster
receiver startup
2-3
1-2
2-3
Mixer output to MIXOUT
External IF input
Connects FSEL2 to GND
(default for 315MHz); see
Table 2.
JU11
JU12
Open*
1-2*
Normal operation, leave open
Connects VDD to +3.3V supply
Connects VDD to +5V supply
Connects FSEL1 to VDD; see
Table 2
1-2*
2-3
Open
JU6
Connects FSEL1 to GND; see
Table 2
*Default position.
Maxim Integrated
3
MAX7042 Evaluation Kit
Evaluates: MAX7042
Both parasitic inductance and capacitance are influ-
ential on circuit layouts and are best avoided by using
short trace lengths. Generally, a 10-mil wide PCB trace,
0.0625in above a ground plane, with FR4 dielectric has
approximately 19nH/in of inductance and approximately
1pF/in of capacitance. In the LNA output/mixer input tank
circuit, the proximity to the MAX7042 IC has a strong
influence on the effective component values.
There is a MIXOUT location on the board that can be
populated with a board-mounted SMA connector to
monitor the IF output or to inject an IF signal into the
IFIN+ pin. Remove the ceramic filter (Y2) for such a
measurement and include R1 (270I) and C13 (0.01µF)
to match the 330I mixer output with the 50I spectrum
analyzer. Connect pins 1-2 of jumper JU11 to see the IF
output on the spectrum analyzer. Connect pins 2-3 of
jumper JU11 to inject an IF signal into the IFIN+ pin from
an external source.
To reduce the parasitic inductance, use 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 connec-
tions.
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 connector. Connect
the SMA to a function generator. The addition of C5 and
C6 (use 0.01µF capacitors), plus the removal of C3 and
C4 are necessary. The recommended amplitude of the
The MAX7042 EV kit PCB can serve as a reference
design for laying out a board using the MAX7042.
Detailed Description of Hardware
function generator is 500mV
.
P-P
Power Supply
The MAX7042 can operate from 3.3V or 5V supplies. For
5V operation, remove jumper JU12 before connecting
the supply to VDD. AVDD is the output of an internal
regulator when VDD = 5V. AVDD and DVDD are con-
nected on the EV kit through VDD3. For 3.3V operation,
connect JU12.
Test Points and I/O Connections
Additional test points and I/O connectors are provided
to monitor the various baseband signals and for external
connections. See Tables 3 and 4 for a description.
Table 3. Test Points
TEST POINT
DESCRIPTION
IF Input/Output
The 10.7MHz IF can be monitored with an oscilloscope
or a spectrum analyzer. To monitor the IF output with an
oscilloscope, connect the scope probe to pin 3 of JU11.
Increase the RF signal generator power to approximately
-70dBm and set the scope amplitude to 20mV or 50mV
per division. Set the time per division on the horizontal
trace to 100ns. The scope trace shows the waveform at
the output of the external ceramic IF filter.
1
2
3
4
5
6
7
AVDD
RSSI
FSK data out
HVIN
DVDD
Positive input to data slicer
Negative input to data slicer
To monitor the IF output on a spectrum analyzer, use the
high-impedance probe attachment from the spectrum
analyzer, if one is available, and connect it to pin 3 of
JU11.
Table 4. I/O Connectors
TEST POINT
DESCRIPTION
RF_IN
RF input
External reference frequency input
IF input/output
Table 2. Frequency Selection Table
REF_IN
MIXOUT
GND
FSEL2 (JU5)
FSEL1 (JU6)
FREQUENCY (MHz)
Ground
0
0
1
1
0
1
0
1
308
315
VDD
Supply input
418
433.92
Note: 1 = 1-2 position; 0 = 2-3 position.
4
Maxim Integrated
MAX7042 Evaluation Kit
Evaluates: MAX7042
Figure 1. MAX7042 EV Kit Schematic
Maxim Integrated
5
MAX7042 Evaluation Kit
Evaluates: MAX7042
Figure 2. MAX7042 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX7042 EV Kit PCB Layout—Component Side
Figure 4. MAX7042 EV Kit PCB Layout—Solder Side
6
Maxim Integrated
MAX7042 Evaluation Kit
Evaluates: MAX7042
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
7
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2009 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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