19-3917; Rev 0; 12/05
MAX7033 Evaluation Kit
General Description
The MAX7033 evaluation kit (EV kit) allows for a
detailed evaluation of the MAX7033 superheterodyne
receiver. It enables testing of the device’s RF perfor-
mance and requires no additional support circuitry. The
RF input uses a 50Ω 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.
The MAX7033 EV kit comes in two versions: 315MHz
and 433.92MHz. The passive components are opti-
mized for these frequencies. These components can
easily be changed to work at RF frequencies from
300MHz to 450MHz. In addition, the received data rate
can be adjusted from 0 to 66kbps by changing three
more components.
For easy implementation into the customer’s design,
the MAX7033 EV 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
download at www.maxim-ic.com.
Features
♦
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 Receiver with the
Addition of an Antenna
*Requires
component changes.
Evaluates: MAX7033
Ordering Information
PART
MAX7033EVKIT-315
MAX7033EVKIT-433
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
IC PACKAGE
28 TSSOP
28 TSSOP
Component List
DESIGNATION
C1, C2, C23
QTY
2
DESCRIPTION
0.01µF
±10%
ceramic capacitors
(0603)
Murata GRM188R71H103KA01
1500pF
±10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H152KA01
0.47µF 80% to 20% ceramic
capacitor (0603)
Murata GRM188F51C474ZA01
470pF
±5%
ceramic capacitor
(0603)
Murata GRM1885C1H471JA01
220pF
±5%
ceramic capacitors
(0603)
Murata GRM1885C1H221JA01
100pF
±5%
ceramic capacitors
(0603)
Murata GRM1885C1H101JA01
4.0pF
±0.1pF
ceramic capacitor
(0603)
Murata GRM1885C1H4R0BZ01
2.2pF
±0.1pF
ceramic capacitor
(0603)
Murata GRM1885C1H2R2BD01
DESIGNATION
C12, C20, C24
C13, C16, C18,
C19
C14, C15
QTY
2
DESCRIPTION
0.1µF
±5%
ceramic capacitors
(0603)
Murata GRM188R71C104KA01
Not installed
15pF
±5%,
50V ceramic capacitors
(0603)
Murata GRM1885C1H150JZ01
Not installed, 0.01µF 80% to 20%
ceramic capacitor (0603)
Murata GRM188R71H103KA01
10pF
±5%,
50V ceramic capacitor
(0603)
Murata GRM1885C1H100JZ01
1000pF
±10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102KA01
Not installed, SMA connector,
edge mount
Johnson 142-0701-801
3-pin headers
Digi-Key S1012-36-ND or
equivalent
C3
1
0
2
C4
1
C17
0
C5
1
C6, C10
2
C21
1
C7, C8, C11
3
C22
1
C9
(315MHz)
C9
(433MHz)
1
F_IN
0
1
JU1, JU2, JU5,
JU6
4
________________________________________________________________
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.
MAX7033 Evaluation Kit
Evaluates: MAX7033
Component List (continued)
DESIGNATION
JU3, JU4
JU7
JU8
L1
(315MHz)
L1
(433MHz)
L2
(315MHz)
L2
(433MHz)
L3
QTY
0
1
1
1
1
1
1
1
DESCRIPTION
Not installed
2-pin header
Shorted
27nH
±5%
inductor (0603)
Coilcraft 0603CS-27NXJB
15nH
±5%
inductor (0603)
Coilcraft 0603CS-15NXJB
120nH
±5%
inductor (0603)
Coilcraft 0603CS-R12XJB
56nH
±5%
inductor (0603)
Coilcraft 0603CS-56NXJB
15nH
±5%
inductor (0603)
Murata LQG18HN15NJ00
Not installed, SMA connector, top
mount
Digi-Key J500-ND
Johnson 142-0701-201
5.1kΩ resistor (0603), any
Not installed, resistors (0603)
Not installed, 270Ω resistor (0603)
any
10kΩ resistor (0603), any
Y1
(433MHz)
1
RF_IN
TP2, TP4–TP12
VDD, GND,
SHDN,
AGC_C,
DATA_OUT, TP3
Y1
(315MHz)
1
0
6
DESIGNATION
R7
R8
QTY
1
1
DESCRIPTION
0Ω resistor (0603)
10kΩ resistor (0603), any
SMA connector, top mount
Digi-Key J500-ND
Johnson 142-0701-201
Not installed
Test points
Mouser 151-203 or equivalent
4.754687MHz crystal
Hong Kong Crystals
SSL4754687E03FAFZ8A0 or
Crystek 016867
6.6128MHz crystal
Hong Kong Crystals
SSL6612813E03FAFZ8A0 or
Crystek 016868
10.7MHz ceramic filter
Murata SFTLA10M7FA00-B0
MAX7033EUI
MAX7033 EV kit PC board
Shunts (JU1)
Digi-Key S9000-ND or equivalent
1
MIX_OUT
0
R1
R2, R4, R6
R3
R5
1
0
0
1
Y2
U1
—
—
1
1
1
5
Quick Start
The following procedures allow for proper device
evaluation.
Required Test Equipment
•
•
Regulated power supply capable of providing
+3.3V
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)
Optional ammeter for measuring supply current
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%, AM-modulated square wave (or a 2kHz
pulse-modulated signal).
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 modula-
tion. 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 amplitude of around -60dBm,
this DC voltage drops suddenly to approximately
1.5V and then starts rising again with increasing
input amplitude. This is normal; the AGC is turning
on the LNA gain-reduction resistor.)
6) Set the RF generator to -100dBm. Activate the RF
generator’s modulation and set the scope’s cou-
•
•
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.
2
_______________________________________________________________________________________
MAX7033 Evaluation Kit
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
Evaluates: MAX7033
Note:
Indicate that you are using the MAX7033 when contact-
ing these component suppliers.
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 MAX7033. All required com-
ponents have been enclosed in 1.25in x 1.25in
2
, which
can be directly “inserted” in the application circuit.
Detailed Description
Power-Down Control
The MAX7033 can be controlled externally using the
SHDN
connector. The IC draws approximately 2.5µA in
shutdown mode. Jumper JU1 is used to control this
mode. The shunt can be placed between pins 2 and 3
for continuous shutdown, or pins 1 and 2 for continuous
operation. Remove JU1 shunt for external control. See
Table 1 for the jumper function descriptions.
pling to AC. The scope now displays a lowpass-fil-
tered square wave at TP3 (filtered analog base-
band data). Use the RF generator’s LF OUTPUT
(modulation output) to trigger the oscilloscope.
7) Monitor the DATA_OUT terminal and verify the pres-
ence of a 2kHz square wave.
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).
2) With the above settings, a 315MHz-tuned EV kit
should display a sensitivity of about -114dBm (0.2%
BER) while a 433.92MHz kit displays a sensitivity of
about -112dBm (0.2% BER).
Note:
The above sensi-
tivity values are given in terms of average.
3) Capacitors C5 and C6 are used to set the corner
frequency of the 2nd-order lowpass Sallen-Key
data filter. The current values were selected for bit
rates up to 3kbps. Adjusting these values accom-
modates higher data rates (refer to the MAX7033
data sheet for more details).
Table 1. Jumper Function
JUMPER
JU1
STATE
1-2
2-3
N.C.
JU2
1-2
2-3
1-2
JU3
2-3
N.C.
JU4
1-2
2-3
1-2
JU5
2-3
N.C.
1-2
JU6
2-3
N.C.
JU7
1-2
N.C.
FUNCTION
Normal operation
Power-down mode
External power-down control
Crystal divide ratio = 32
Crystal divide ratio = 64
Mixer output to MIX_OUT
External IF input
Normal operation
Uses PDOUT for faster receiver startup
GND connection for peak detector filter
Disable AGC
Enable AGC
External control of AGC lock function
IR centered at 433MHz
IR centered at 315MHz
IR centered at 375MHz
Connect VDD to +3.3V supply
Connect VDD to +5.0V supply
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
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%.
_______________________________________________________________________________________
3
MAX7033 Evaluation Kit
Evaluates: MAX7033
Power Supply
The MAX7033 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.
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.
For additional information and a list of application
notes, visit www.maxim-ic.com.
IF Input/Output
The 10.7MHz IF can be monitored with the help of a
spectrum analyzer using the MIX_OUT SMA (not provid-
ed). Remove the ceramic filter for such a measurement
and include R3 (270Ω) and C17 (0.01µF) to match the
330Ω mixer output with the 50Ω spectrum analyzer.
Jumper JU3 needs to connect pins 1 and 2. It is also
possible to use the MIX_OUT SMA to inject an external
IF as a means of evaluating the baseband data slicing
section. Jumper JU3 needs to connect pins 2 and 3.
Table 2. Test Points
TP
2
3
4
5
6
7
8
9
10
11
12
Data filter output
Peak detector out
+3.3V
GND
Data filter feedback node
Data out
Power-down select input
VDD
AGC control
Crystal select
DESCRIPTION
Data slicer negative input
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 (not provided).
Connect the SMA to a function generator. The addition
of C18 and C19 is necessary (use 0.01µF capacitors).
AGC Control
Jumper JU5 controls whether the AGC is enabled.
Connect pins 2 and 3 to enable the AGC. In addition,
by removing the jumper, the AGC setting can be
locked or unlocked by transitioning the AC pin while the
SHDN
pin is high.
Table 3. I/O Connectors
SIGNAL
RF_IN
F_IN
MIX_OUT
GND
VDD
DATA_OUT
SHDN
AGC_C
RF input
External reference frequency input
IF input/output
Ground
Supply input
Sliced data output
External power-down control
AGC control
DESCRIPTION
Crystal Select
Jumper JU2 controls the crystal-divide ratio.
Connecting pins 1 and 2 sets the divide ratio to 32,
while connecting pins 2 and 3 sets the ratio to 64. This
determines the frequency of the crystal to be used.
Image-Rejection Frequency Select
A unique feature of the MAX7033 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 settings.
4
_______________________________________________________________________________________
C14
15pF
F_IN
C16
OPEN
*
C9
L1
L2
Y1
Y1
*
C15
15pF
C19
OPEN
AT 315MHz
4pF
27nH
120nH
4.75687MHz
AT 433.92MHz
2.2pF
15nH
56nH
6.6128MHz
C18
OPEN
1
XTAL1
TP9
SHDN
AV
DD
SHDN
27
26
TP4
R2
OPEN
DSN
1
2 JU4
3
25
VDD
AV
DD
V
DD
5
8
MIXIN1
MIXIN2
DSP
C22
1000pF
JU8
AGND
IRSEL
21
20
C4
0.47µF
TP3
C6
220pF
DSN
DSN
R1
5.1kΩ
MIXOUT
DFO
DGND
DV
DD
IFIN2
18
19
R8
10kΩ
C3
1500pF
TP2
DFFB
22
TP7
C5
470pF
23
R7
0Ω
+3.3V
9
C8
100pF
+3.3V
1
3
+3.3V
OPP
VDD
JU7
VDD
2
JU6
11
10
C10
220pF
C23
0.01µF
C24
0.1µF
C21
10pF
24
R5
10kΩ
TP8
DATA_OUT
C13
OPEN
3
JU1
1
2
XTAL2
+3.3V
2
C7
100pF
L2
*
3
LNAIN
LNASRC
AGND
LNAOUT
DATAOUT
L3
15nH
4
5
+3.3V
6
+3.3V
7
C11
100pF
C2
0.01µF
C9
*
C12
0.1µF
28
VDD
U1
PDOUT
RF_IN
Figure 1. MAX7033 EV Kit Schematic
MAX7033
L1
*
R6
OPEN
GND
TP6
TP5
12
13
+3.3V
14
C1
0.01µF
C20
0.1µF TP10
17
IFIN1
16
XTALSEL
TP12
AC
15
+3.3V
1
TP11
3
Y2
10.7MHz
IN
1
GND OUT
2
3
JU2
1
3
+3.3V
2
3
1
2
JU3
R4
OPEN
2
JU5
AGC_C
R3
OPEN
C17
OPEN
MIX_OUT
Evaluates: MAX7033
_______________________________________________________________________________________
MAX7033 Evaluation Kit
5
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