19-1493; Rev 0; 7/99
MAX2685 Evaluation Kit
Evluates:MAX2685
General Description
Features
♦ +2.7V to +5.5V Single-Supply Operation
♦ 50Ω SMA Inputs and Outputs
The MAX2685 evaluation kit (EV kit) simplifies testing of
the MAX2685. This EV kit allows evaluation of the low-
noise amplifier (LNA) as well as the downconverter
mixer.
♦ Fully Assembled and Tested
♦ Allows Testing of All Device Functions
Component List
DESIGNATION QTY
DESCRIPTION
Ordering Information
C1, C3, C5,
4
0.1µF ceramic capacitors
C17
PART
TEMP. RANGE
IC PACKAGE
C2, C14, C15
C4, C8
C6, C7, C10
C9
0
2
2
1
2
1
1
Not installed
MAX2685EVKIT
-40°C to +85°C
16 QSOP
47pF ceramic capacitors
330pF ceramic capacitors
3.3pF ceramic capacitor
6pF ±0.1pF ceramic capacitors
1000pF ceramic capacitor
12pF ±0.1pF ceramic capacitor
_________________________Quick Start
The MAX2685 EV kit is fully assembled and factory
tested. Follow the instructions in the Connections and
Setup section for proper device evaluation.
C11, C18
C12
C13
Test Equipment Required
This section lists the equipment recommended for veri-
fying the MAX2685’s operation. It is intended as a
guide only; some substitutions are possible.
10µF tantalum capacitor
AVX TAJC106K016
C16
L1
1
1
1
1
12nH inductor
Toko LL1608-SH12NK
• Two RF signal generators capable of delivering at
least 0dBm of output power at frequencies to 2GHz
(HP 8648C or equivalent). One generator is required
for the local oscillator (LO) source; the other is
required for the mixer and LNA RF input. Only one
generator is required to operate the LNA.
680nH ±5% inductor
Coilcraft 1008CS-681XJBC 5%
L2
820nH ±5% inductor
Coilcraft 1008CS-821XJBC 5%
L3
L4
R1, R2
R3
1
2
1
1
1
3
Not installed
1kΩ resistors
75Ω resistor
15kΩ resistor
0Ω resistor
• An RF spectrum analyzer that covers the MAX2685’s
operating frequency range (the HP 8561E, for exam-
ple).
R4
• A power supply that can provide up to 100mA at
+2.7V to +5.5V.
R5
• An ammeter for measuring the supply current
R6, R7, R8
Not installed
(optional).
IFOUT+,
IFOUT-, LNAIN,
LNAOUT, LO,
MIXIN
• Several 50Ω SMA cables.
6
SMA connectors (PC edge mount)
Connections and Setup
This step-by-step guide explains how to get the EV kit
operational and how to evaluate both the LNA and the
downconverter mixer.
JU1, JU2
2
2
1
1
3-pin headers
GND, V
U1
Eyelets
CC
MAX2685EEE (16-pin QSOP)
MAX2685 PC board
None
________________________________________________________________ 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.