MAX2681EVKIT Maxim Integrated Products, MAX2681EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX2681EVKIT
• Description: RF Modules & Development Tools MAX2681 EVAL KIT MAX2681 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX2681EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

C1 is a DC-blocking capacitor and is required for the
LO input port. Pads C7 and C8 are left open on the EV
kits, but are provided for experimentation. Pad R1 is left
open on the kits, but is provided as an option to resis-
tively terminate the IFOUT port.
Capacitors C4, C5, and C6 form the V
network. Note the location of each component. C5, a
10µF tantalum capacitor, is located near the V
nector. This serves as the central node for distribution
of V
pull-up inductor L1. Capacitor C6, placed near the V
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.
Figure 1. MAX2680/MAX2681/MAX2682 EV Kits Schematic
RF
CC
SMA
MAX2680/MAX2681/MAX2682 Evaluation Kits
to the mixer’s supply pin and the IFOUT output
C8
OPEN
Z1
_______________________________________________________________________________________
LO
SMA
Z3
270pF
C1
Z2
1
2
3
LO
GND
RFIN
CC
MAX2680
MAX2681
MAX2682
decoupling
U1
CC
IFOUT
SHDN
V
con-
CC
CC
6
5
4
1000pF
The MAX2680/MAX2681/MAX2682 EV kits are easily
used at RF frequencies from 400MHz to 2500MHz, and
at IF frequencies from 10MHz to 500MHz. To operate at
frequencies other than the factory configuration of
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 Impedance vs. RF Frequency and IF Port
Impedance vs. IF Frequency in the Typical Operating
Characteristics in the MAX2680/MAX2681/MAX2682
data sheet and follow typical impedance matching
methods.
1000pF
R1
OPEN
C3
C4
L1
330nH
15pF
C2
SHORT
R2
C7
OPEN
1000pF
2
Modifying the EV Kit
SMA
C6
3
1
JU1
IF
C5
10 F
10V
VCC
SHDN
GND
3