MAX1470EVKIT [MAXIM]
Evaluation Kit for the MAX1470 ; 评估板MAX1470\n
| 型号： | MAX1470EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1470
|
| 文件： | 总6页 (文件大小：284K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2609; Rev 1; 12/02
MAX1470 Evaluation Kit
General Description
Features
The MAX1470 evaluation kit (EV kit) allows for a
detailed evaluation of the MAX1470 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.
o Proven PC Board Layout (Compact 3cm ✕ 3cm)
o Proven Components Parts List
o Multiple Test Points Provided On-Board
o Available in 315MHz or 433.92MHz Optimized
Versions
o 250MHz to 500MHz* Adjustable Frequency Range
o Fully Assembled and Tested
The MAX1470 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 250MHz to 500MHz. In addition, the 5kbps
data rate can be adjusted from 0kbps to 100kbps by
changing two more components.
o Can Operate as a Stand-Alone Receiver with
Addition of an Antenna
*Requires component changes.
Ordering Information
For easy implementation into the customer’s design, the
MAX1470 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.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
IC PACKAGE
MAX1470EVKIT-315
MAX1470EVKIT-433
28 TSSOP
28 TSSOP
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
3.0pF 0.1pF ceramic capacitor
(0603)
Murata GRM1885C1H3R0BD01
0.01µF 10% ceramic capacitors
(0603)
Murata GRM188R71H103KA01
C9 (433MHz)
1
0
2
C1, C2, C12
C3
3
1
1
1
2
3
1
C13, C16, C18,
C19
1500pF 10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H152KA01
Not installed
15pF 5%, 50V ceramic capacitors
(0603)
Murata GRM1885C1H150JZ01
C14, C15
C17
0.47µF +80% - 20% ceramic
capacitor (0603)
Murata GRM188F51C474ZA01
C4
0.1µF +80% - 20% ceramic
capacitor (0603)
Murata GRM188R71H103KA01,
not installed
0
470pF 5% ceramic capacitor
(0603)
Murata GRM1885C1H471JA01
C5
SMA connector edge mount,
not installed
EFJohnson 142-0701-801
220pF 5% ceramic capacitors
(0603)
Murata GRM1885C1H221JA01
F_IN
JU1
1
1
C6, C10
C7, C8, C11
C9 (315MHz)
3-pin header
Digi-Key S1012-36-ND or
equivalent
100pF 5% ceramic capacitors
(0603)
Murata GRM1885C1H101JA01
Shunt (JU1)
Digi-Key S9000-ND or equivalent
—
1
0
4.7pF 0.1pF ceramic capacitor
(0603)
Murata GRM1885C1H4R7BZ01
JU3, JU4
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.
MAX1470 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
27nH 5% inductor (0603)
Murata LQG18HN27NJ00
SMA connector top mount,
not installed
EFJohnson 142-0701-201
L1 (315MHz)
L1 (433MHz)
1
1
MIX_OUT
0
15nH 5% inductor (0603)
Murata LQG18HN15NJ00
TP1, TP2,
TP4–TP8
0
5
Not installed
120nH 5% inductor (0603)
Toko LL1608FSR12J or
Murata LQW18ANR12J00
3.3V, GND,
SHDN,
DATA_OUT, TP3
L2 (315MHz)
1
Test points
Mouser 151-203 or equivalent
68nH 5% inductor (0603)
Toko LL1608FH68J or
Murata LQG18HN68NJ00
Crystal 4.754687MHz
Hong Kong Crystals
SSL4754687E03FAFZ8A0 or
Crystek 016867
L2 (433MHz)
L3
1
1
Y1 (315MHz)
1
15nH 5% inductor (0603)
Murata LQG18HN15NJ00
Crystal 6.6128 MHz
Hong Kong Crystals
SSL6612813E03FAFZ8A0 or
Crystek 016868
5k resistor (0603)
Any supplier
Y1 (433MHz)
Y2
1
1
R1
R2, R4
R3
1
0
0
Resistor (0603), not installed
10.7MHz ceramic filter
Murata SFTLA10M7FA00-B0
270 resistor (0603), not installed
Any supplier
U1
1
1
MAX1470EUI
10k resistor (0603)
Any supplier
R5
1
1
—
MAX1470 EV kit PC board
SMA connector top mount
EFJohnson 142-0701-201
RF_IN
• Optional ammeter for measuring supply current
• Oscilloscope
Component Suppliers
SUPPLIER
Crystek
PHONE
FAX
Connections and Setup
800-237-3061
852-2412-0121
800-831-9172
408-432-8281
941-561-1025
852-2498-5908
814-238-0490
408-943-9790
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 3.3V and GND terminals
on the EV kit. Do not turn on the supply.
Hong Kong Crystals
Murata
Toko
Note: Please indicate that you are using the MAX1470 when
contacting these component suppliers.
Quick Start
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).
The following procedure allows 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)
3) Connect the oscilloscope to test point TP3.
2
_______________________________________________________________________________________
MAX1470 Evaluation Kit
4) Turn on the DC supply. The supply current should
read approximately 6mA.
3) Use capacitors C5 and C6 to set the corner fre-
quency of the 2nd-order lowpass Sallen-Key data
filter. The current values were selected for a corner
frequency of 5kHz. Adjusting these values accom-
modates higher data rates (refer to the MAX1470
data sheet for more details).
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
-50dBm.
Layout Issues
6) Set the RF generator to -100dBm. Activate the RF
generator’s modulation and set the scope’s cou-
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.
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 approx-
imately 1/20 the wavelength or longer become anten-
nas. For example, a 2in trace at 315MHz can act as an
antenna.
7) Monitor the DATA_OUT terminal and verify the pres-
ence of a 2kHz square wave.
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%.
To reduce the parasitic inductance, use wider traces
and a solid ground or power plane below the signal
traces. Using a solid ground plane can reduce the par-
asitic inductance from approximately 20nH/in to 7nH/in.
Also, use low-inductance connections to ground on all
GND pins, and place decoupling capacitors close to all
VDD connections.
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 -118dBm (1%
BER), while a 433.92MHz kit displays a sensitivity of
about -114dBm (1% BER). Note: The above sensi-
tivity values are given in terms of average carrier
power. If true pulse modulation is used instead of
AM, then the sensitivity measurement is in terms of
peak power, and as a result is reduced by 6dB.
The EV kit PC board can serve as a reference design for
laying out a board using the MAX1470. All required com-
ponents have been enclosed in a 1.25in x 1.25in square,
which can be directly “inserted” in the application circuit.
Table 1. Jumper Function Table
Table 2. Test Points
JUMPER
JU1
STATE
1-2
FUNCTION
Normal operation
Power-down mode
TP
DESCRIPTION
PLL control voltage (Note: Connecting anything to
this test point degrades RF performance.)
1
JU1
2-3
2
3
4
5
6
7
8
9
Data slicer negative input
Data slicer positive input
Peak detector out
VDD
External power-down
control
JU1
JU3
N.C.
1-2
Mixer output to
MIX_OUT
JU3
JU3
2-3
External IF input
Normal operation
GND
N.C.
Data filter feedback node
Data out
Uses PDOUT for faster
receiver startup
JU4
JU4
1-2
2-3
Power-down select input
GND connection for
peak detector filter
_______________________________________________________________________________________
3
MAX1470 Evaluation Kit
Detailed Description
Power-Down Control
The MAX1470 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
for continuous shutdown, or pins 1 and 2 for continuous
operation. Remove the JU1 shunt for external control.
See Table 1 for the jumper function descriptions.
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 (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 to inject an external
IF as a means of evaluating the baseband data slicing
section. Jumper JU3 needs to connect pins 2 and 3.
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).
Figure 1. MAX1470 EV Kit
Table 3. I/O Connectors
SIGNAL
DESCRIPTION
Test Points and I/O Connections
RF_IN
F_IN
RF input
Additional test points and I/O connectors are provided
to monitor the various baseband signals and for external
connections. See Tables 2 and 3.
External reference frequency input
IF input/output
MIX_OUT
GND
Ground
3.3V
3.3V power input
DATA_OUT
SHDN
Sliced data output
External power-down control
4
_______________________________________________________________________________________
MAX1470 Evaluation Kit
C14
15pF
C15
15pF
C19
OPEN
Y1
*
F_IN
C16
OPEN
3.3V
C18
OPEN
28
XTAL2
1
2
1
3
SHDN
JU1
XTAL1
AV
3.3V
27
26
PWRDN
3.3V
2
PDOUT
TP4
DD
TP9
TP5
C12
0.01
DSN
C13
OPEN
R2
F
1
C7
100pF
OPEN
L2
*
JU4
RF_IN
2
3
LNAIN
3
25
L3
15nH
DATAOUT
24
23
4
5
N.C.
N.C.
LNASRC
AGND
DATA_OUT
R5
10k
TP8
22
21
DF
TP7
6
7
U1
LNAOUT
OPP
3.3V
C6
220pF
MAX1470
AV
DD
DSN
TP2
C2
20
DSN
C11
100pF
0.01
F
C4
C5
470pF
R1
5k
8
9
0.47
F
MIXIN1
C9
*
L1
*
C8
100pF
19
18
DSP
3.3V
GND
MIXIN2
AGND
N.C.
TP3
C10
220pF
IFIN2
10
11
C3
1500pF
TP6
17
16
12
13
14
IFIN1
N.C.
MIXOUT
DGND
C17
OPEN
R3
OPEN
3
MIX_OUT
JU3
315MHz 433.92MHz
15
*
DV
DD
N.C.
TP1
3.3V
2
C9
4.7pF
3.0pF
1
C1
0.01
L1
27nH
120nH
15nH
68nH
Y2
10.7MHz
R4
OPEN
F
IN
OUT
3
GND
2
L2
Y1 4.754687MHz 6.6128MHz
1
Figure 2. MAX1470 EV Kit Circuit Diagram
_______________________________________________________________________________________
5
MAX1470 Evaluation Kit
Figure 4. MAX1470 EV Kit PC Board Layout—Top Copper
Figure 3. MAX1470 EV Kit Component Placement Guide—Top
Silkscreen
Figure 5. MAX1470 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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