MAX2680EVKIT [MAXIM]
Easy Evaluation of All Device Functions;
| 型号： | MAX2680EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Easy Evaluation of All Device Functions |
| 文件： | 总4页 (文件大小：135K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4786; Rev 1; 11/98
MAX2 6 8 0 /MAX2 6 8 1 /MAX2 6 8 2 Eva lu a t io n Kit s
Evluate:01/MAX682
Ge n e ra l De s c rip t io n
Fe a t u re s
♦ Easy Evaluation of MAX2680/MAX2681/MAX2682
♦ Easy Evaluation of All Device Functions
♦ +2.7V to +5.5V Single-Supply Operation
♦ RF Input Matched to 50Ω at 900MHz
The MAX2680/MAX2681/MAX2682 evaluation kits (EV
kits ) s im p lify th e e va lu a tio n o f th e MAX2 6 8 0 /
MAX2681/MAX2682 d ownc onve rte r mixe rs . The y
enable testing of all device functions and require no
additional support circuitry. Signal inputs and outputs
use SMA connectors to ease the connection of RF test
equipment.
♦ IF Output Matched to 50Ω at 70MHz
All three EV kits share the same PC board but have RF
input matching components optimized for each device
at an RF frequency of 900MHz. Be sure to select the EV
kit for the device that meets your performance needs.
Cons ult the Se le c tor Guid e in the MAX2680/
MAX2681/MAX2682 data sheet for the various combi-
nations of power gain, input IP3, noise figure, and sup-
p ly c urre nt offe re d b y e a c h d e vic e . The IF outp ut
matching components are optimized for an IF frequen-
c y of 70MHz. All ma tc hing c omp one nts ma y b e
changed to match RF frequencies from 400MHz to
2.5GHz and IF frequencies from 10MHz to 500MHz.
Consult Tables 2 and 4 in the MAX2680/MAX2681/
MAX2682 data sheet for component values appropriate
for each device at other RF and IF operating frequen-
cies.
♦ SMA Input and Output Signal Connectors
♦ All Critical Peripheral Components Included
Co m p o n e n t s Co m m o n
t o All Th re e EV Kit s
DESIGNATION QTY
DESCRIPTION
270pF ceramic capacitor (0603)
15pF ceramic capacitor (0603)
1000pF ceramic capacitors (0603)
10µF, 10V tantalum capacitor (0805)
Open
C1
C2
1
1
3
1
2
C3, C4, C6
C5
C7, C8
330nH inductor
Coilcraft 1008HS-330TJBC
L1
1
Ord e rin g In fo rm a t io n
R1
R2
0
0
3
1
Open
Not installed, short
SMA connectors (edge mount)
3-pin header
TEMP.
RANGE
SOT
TOP MARK
PART
IC PACKAGE
IF, LO, RF
JU1
MAX2680EVKIT -40°C to +85°C 6 SOT23-6
MAX2681EVKIT -40°C to +85°C 6 SOT23-6
MAX2682EVKIT -40°C to +85°C 6 SOT23-6
AAAR
AAAS
AAAT
GND, V
SHDN
,
CC
3
1
Eyelets
None
MAX2680/MAX2681/MAX2682 PC board
MAX2 6 8 0 EV Kit
Ad d it io n a l Co m p o n e n t s
Co m p o n e n t S u p p lie rs
SUPPLIER
AVX
PHONE
FAX
DESIGNATION QTY
DESCRIPTION
Z1
1
270pF ceramic capacitor (0603)
803-946-0690
847-639-6400
708-297-0070
803-626-3123
847-639-1469
708-699-1194
Coilcraft
22nH inductor
Toko LL1608-FH22NJ
Z2
1
Toko America
Z3
U1
0
1
Open
MAX2680EUT-T (6-pin SOT23)
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX2 6 8 0 /MAX2 6 8 1 /MAX2 6 8 2 Eva lu a t io n Kit s
MAX2 6 8 1 EV Kit
MAX2 6 8 2 EV Kit
Ad d it io n a l Co m p o n e n t s
Ad d it io n a l Co m p o n e n t s
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
Z1
1
270pF ceramic capacitor (0603)
Z1
Z2
1
1
1.5pF ceramic capacitor (0603)
270pF ceramic capacitor (0603)
18nH inductor
Toko LL1608-FHI8NJ
Z2
1
10nH inductor
Toko LL1608-FH10NJ
Z3
U1
1
1
Z3
U1
0
1
Open
MAX2681EUT-T (6-pin SOT23)
MAX2682EUT-T (6-pin SOT23)
q ue nc y to 970MHz a nd outp ut p owe r le ve l to
-5dBm.
Qu ic k S t a rt
The MAX2680/MAX2681/MAX2682 EV kits a re fully
assembled and factory tested. Follow the instructions in
the Connections and Setup section for proper device
evaluation.
5) Use a third 50Ω SMA cable to connect the IF con-
nector of the EV kit to the spectrum analyzer. Take
c a re to us e q ua lity c onne c tor a d a p te rs for the
spectrum analyzer’s input. Avoid the use of BNC-
type connectors due to their high VSWR while oper-
ating in the GHz range.
Te s t Eq u ip m e n t Re q u ire d
This section lists the recommended test equipment to
ve rify the op e ra tion of the MAX2680/MAX2681/
MAX2682. It is intended as a guide only, and some
substitutions are possible.
An a lys is
1) Set the spectrum analyzer’s center frequency to
70MHz, with a frequency span of 1MHz.
•
•
•
•
•
DC power supply capable of supplying a minimum
of 50mA at +2.7V to +5.5V
2) Set the spectrum analyzer’s marker to read the
peak power level of the center frequency. For the
MAX2680 the IF power level is nominally -13.4dBm.
The IF output power is equal to the RF input power
p lus the c onve rs ion g a in of the d ownc onve rte r
mixer. The MAX2680 has a typical conversion gain
of 11.6dB. The MAX2681 has a typical conversion
gain of 14.2dB. The MAX2682 has a typical conver-
sion gain of 14.7dB.
HP8561E spectrum analyzer or equivalent high-
sensitivity spectrum analyzer
Digital multimeter (DMM) to monitor DC supply volt-
age and supply current (if desired)
Two HP8648C RF signal generators or equivalent
(50Ω) sine-wave sources for the RF and LO inputs
Three 50Ω SMA cables (RG-58A/U or equivalent)
Co n n e c t io n s a n d S e t u p
De t a ile d De s c rip t io n
1) Verify the DC power supply is set to less than +5.5V
and is off before connecting the supply to the EV
kit. A good starting point is +3.0V. Connect the
This section describes the circuitry surrounding the
MAX2680/MAX2681/MAX2682 EV kits . For more
detailed information covering device operation, please
consult the MAX2680/MAX2681/MAX2682 data sheet.
Evluate:01/MAX682
power supply between V and GND, and turn the
CC
power supply on.
Figure 1 is the schematic for the MAX2680/MAX2681/
MAX2682 EV kits. The RF input matching components
Z1, Z2, and Z3 are optimized for each device and for
an RF frequency of 900MHz. A DC-blocking capacitor
is required on the RF port. The IF output matching com-
ponents, L1 and C2, are optimized for an IF frequency
of 70MHz and are independent of the device chosen.
Consult Tables 2 and 4 in the MAX2680/MAX2681/
MAX2682 data sheet for components appropriate for
each device at other RF and IF frequencies. Capacitor
2) Verify the jumper JU1 is in the “on” position, pin 1
shorted to pin 2 (SHDN = V ).
CC
3) Use a 50Ω SMA cable to connect a signal genera-
tor to the SMA RF connector of the EV kit. Set the
signal generator’s output frequency to 900MHz and
output power level to -25dBm.
4) Use another 50Ω SMA cable to connect a second
signal generator to the SMA LO connector of the EV
kit. Set the second signal generator’s output fre -
2
_______________________________________________________________________________________
MAX2 6 8 0 /MAX2 6 8 1 /MAX2 6 8 2 Eva lu a t io n Kit s
Evluate:01/MAX682
C1 is a DC-blocking capacitor and is required for the
Mo d ifyin g t h e EV Kit
LO input port. Pads C7 and C8 are left open on the EV
The MAX2680/MAX2681/MAX2682 EV kits are easily
kits, but are provided for experimentation. Pad R1 is left
used at RF frequencies from 400MHz to 2500MHz, and
open on the kits, but is provided as an option to resis-
at IF frequencies from 10MHz to 500MHz. To operate at
tively terminate the IFOUT port.
fre q ue nc ie s othe r tha n the fa c tory c onfig ura tion of
Capacitors C4, C5, and C6 form the V
decoupling
CC
900MHz RF and 70MHz IF, refer to Tables 2 and 4 in
the MAX2680/MAX2681/MAX2682 data sheet for the
suggested component values. For operation at frequen-
cies other than those given here, consult the graphs RF
Port Imp e d a nc e vs . RF Fre q ue nc y a nd IF Port
Impedance vs. IF Frequency in the Typical Operating
Characteristics in the MAX2680/MAX2681/MAX2682
da ta she e t a nd follow typic a l impe d a nc e ma tc hing
methods.
network. Note the location of each component. C5, a
10µF tantalum capacitor, is located near the V con-
CC
nector. This serves as the central node for distribution
of V to the mixer’s supply pin and the IFOUT output
CC
pull-up inductor L1. Capacitor C6, placed near the V
CC
connection, and capacitor C4, placed near the device,
help to reduce any high-frequency crosstalk. Capacitor
C3, placed near the SHDN pin on the device, helps to
filter out any noise. For additional filtering, add resistor
R2 to the EV kit after cutting the short across the pads
for R2.
C3
1000pF
SHDN
C1
270pF
R2
SHORT
SMA
1
2
6
5
GND
SHDN
LO
LO
3
C4
U1
1000pF
JU1
2
1
MAX2680
MAX2681
MAX2682
V
CC
VCC
GND
C6
C5
1000pF
10µF
10V
R1
OPEN
L1
330nH
Z2
SMA
Z1
SMA
4
3
IF
RF
IFOUT
RFIN
C7
OPEN
C8
OPEN
C2
15pF
Z3
Figure 1. MAX2680/MAX2681/MAX2682 EV Kits Schematic
_______________________________________________________________________________________
3
MAX2 6 8 0 /MAX2 6 8 1 /MAX2 6 8 2 Eva lu a t io n Kit s
1.0"
Figure 2. MAX2680/MAX2681/MAX2682 EV Kits PC Board
Layout —Component Silkscreen
Evluate:01/MAX682
1.0"
1.0"
Figure 3. MAX2680/MAX2681/MAX2682 EV Kits PC Board
Layout —Component Side Metal
Figure 4. MAX2680/MAX2681/MAX2682 EV Kits PC Board
Layout —Ground Plane
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.
4 _____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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