19-0711; Rev 0; 12/06
MAX2170 Evaluation Kit
General Description
The MAX2170 evaluation kit (EV kit) simplifies evalua-
tion of the MAX2170 direct-conversion to low-IF tuner. It
enables testing of the device’s performance and
requires no additional support circuitry. Standard 50Ω
SMA and BNC connectors are included on the EV kit for
the inputs and outputs to allow quick and easy evalua-
tion on the test bench. The EV kit is fully assembled and
tested at the factory.
This document provides a list of equipment required to
evaluate the device, a straightforward test procedure to
verify functionality, a description of the EV kit circuit, the
circuit schematic, a bill of materials (BOM) for the kit,
and artwork for each layer of the PCB.
o
Easy Evaluation of the MAX2170
o
+2.7V to +3.5V Single-Supply Operation
Ω
o
50Ω SMA Connector on the RF Ports
Ω
o
50Ω BNC Connector for the Baseband Output
o
Jumpers for Automatic Gain Control
o
All Critical Peripheral Components Included
o
Parallel Port for I
2
C Interfacing
o
PC Control Software Available at
www.maxim-ic.com
Features
Evaluates: MAX2170
Ordering Information
PART
MAX2170EVKIT+
TEMP RANGE
-40°C to +85°C
IC PACKAGE
40 QFN-EP*
+Denotes
a lead-free and RoHS-compliant EV kit.
*EP
= Exposed paddle.
Component List
DESIGNATION
C1
C2, C6, C46,
C47, C71, C72,
C73
C3, C14, C17
C4
C5
C7, C18, C22,
C38, C39, C41
C8, C13, C16,
C20, C28, C29
C9, C10, C15,
C19, C21, C31,
C40, C42, C44,
C45, C75
C11, C12
QTY
1
DESCRIPTION
18pF ±5% capacitor (0402)
Murata GRM1555C1H180J
330pF ±10% capacitors (0402)
Murata GRM155R71H331K
1.0µF ±10% capacitors (0402)
Murata GRM155R60J105K
100µF ±20% capacitor (1210)
AVX 1210D107MAT
4.7µF ±20% capacitor (0805)
Murata GRM21BF51A475Z
1000pF ±5% capacitors (0402)
Murata GRM1555C1H102J
0.01µF ±10% capacitors (0402)
Murata GRM155R71C103K
0.1µF ±10% capacitors (0402)
Murata GRM155R61A104K
0.33µF ±10% capacitors (0603)
Murata GRM155R60J334K
DESIGNATION
C23
C24, C25, C26,
C30, C32–C37,
C43, C48
C27
QTY
1
DESCRIPTION
100pF ±5% capacitor (0402)
Murata GRM1555C1H101J
Not installed, capacitors
33pF ±5% capacitor (0402)
Murata GRM1555C1H330J
10µF ±10% tantalum capacitor
(C-case)
AVX TAJC106K016
Super-mini Schottky diode
Central Semi CMDSH2-3 (lead free)
BNC 50Ω vertical mount
A/D Electronics 580-002-00
Not installed
SMA end-launch jack receptacles,
0.062in
Johnson 142-0701-801
DB25 right-angle male connector
AMP 5747238-4
Not installed
7
0
3
1
1
6
6
1
C76
1
D1
J1
J2
J3, J4
1
1
0
2
11
J13
2
JP1
1
0
________________________________________________________________
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.
MAX2170 Evaluation Kit
Evaluates: MAX2170
Component List (continued)
DESIGNATION
JP3
JP4, JP10
L1
L3, L4
Q1, Q2, Q3
R1
R2, R6
R3, R9–R12,
R18, R41, R42
R4, R5
R7, R35, R39
R8, R37, R46,
R47
R13
R14, R43
R15, R16, R19,
R25, R27, R28,
R29
R17, R20, R21,
R22, R24
R23
QTY
1
2
1
2
3
1
2
8
2
3
4
1
2
0
DESCRIPTION
1 x 2 in-line header, 100-mil center
Sullins PEC36SAAN
1 x 3 in-line headers, 100-mil center
Sullins PEC36SAAN
Not installed
91nH ±5% inductors (0603CS)
Murata LQW18AN91NJ00
NPN 1GHz wideband transistors
Philips BFS17W
270Ω ±5% resistor (0402)
1kΩ ±1% resistors (0402)
100Ω ±5% resistors (0402)
2kΩ ±1% resistors (0402)
12kΩ ±5% resistors (0402)
2.7kΩ ±5% resistors (0402)
27.4kΩ ±1% resistor (0402)
5.1kΩ ±5% resistors (0402)
Not installed, resistors
Y2
BB+, BB-,
HOLD_AGC,
J5, J14, MUX,
REF, VDET,
VGC_BB,
VGC_RF,
VTUNE
GND, J15, TP1,
TP2
—
1
49.9Ω ±1% resistor (0402)
1
U3
U4
1
1
DESIGNATION
R26
R30
R31, R33
R32
R34
R36, R38
U1
U2
QTY
1
1
2
1
1
2
1
1
DESCRIPTION
0Ω ±5% resistor (0402)
6.2kΩ ±5% resistor (0402)
4.7kΩ ±5% resistors (0402)
1kΩ ±5% resistor (0402)
160kΩ ±5% resistor (0402)
39kΩ ±5% resistors (0402)
MAX2170ETL+
MAX4453ESA+ single-supply op
amp with rail-to-rail outputs
Hex buffer/driver
Texas Instruments SN74LV07ADB
MAX4729EXT+ low-voltage, SPDT
CMOS analog switch
24.576MHz crystal
TXC Corporation 7B24500140
11
PC mini (red)
Keystone 5000
4
1
5
10kΩ ±5% resistors (0402)
PC mini (black)
Keystone 5001
MAX2170EVKIT+ PCB
Component Suppliers
SUPPLIER
AVX Corp.
Central Semiconductor Corp.
Coilcraft, Inc.
Murata Mfg. Co., Ltd.
Philips
Texas Instruments Inc.
TXC Technology
PHONE
843-448-9411
631-435-1110
847-639-6400
770-436-1300
800-447-1500
800-336-5236
714-990-5510
FAX
843-448-7139
631-435-1824
847-639-1469
770-436-3030
—
—
714-990-5520
WEBSITE
www.avxcorp.com
www.centralsemi.com
www.coilcraft.com
www.murata.com
www.nxp.com
www.ti.com
www.txc.com.tw
Note:
Indicate that you are using the MAX2170 when contacting these component suppliers.
2
_______________________________________________________________________________________
MAX2170 Evaluation Kit
Quick Start
Recommended Equipment
This section lists the recommended test equipment to
verify operation of the MAX2170. It is intended as a
guide only, and some substitutions are possible:
• One RF signal generator capable of delivering at
least +5dBm of output power at the operating fre-
quency (HPE4433B or equivalent)
• An RF spectrum analyzer that covers the MAX2170
operating-frequency range (e.g., FSEB20)
• A power supply capable of up to 1A at +2.7V to
+6.0V
• One ammeter for measuring the supply current
(optional)
• 50Ω SMA cables
• 50Ω BNC cables
• A network analyzer (e.g., HP 8753D) to measure
small-signal return loss (optional)
4) Connect one RF signal generator to either the VHF-
III, FM, or L-BAND input through the SMA connec-
tors J3 and J4, respectively. Do not turn on the gen-
erator’s output.
5) Connect the baseband output on the EV kit to a
spectrum analyzer through a BNC cable.
6) Connect the EV kit board to the PC through a paral-
lel cable.
7) Turn on the DC supply. The supply current should
read approximately 70mA.
8) Run the control software on an IBM-compatible PC.
Using the control software, configure the following:
a) Select the desired band of operation and chan-
nel through the
Block
section of the software’s
graphical interface.
b) Based on the LO frequency, the EV kit software
automatically sets the appropriate tracking-filter
settings in VHF/FM mode.
c) The power-detector threshold is factory-calibrat-
ed to a typical input power of -52dBm. This infor-
mation is stored in bits <7:5> of register 00 in the
ROM table. The EV kit software automatically
loads the information stored in bits <7:5> of reg-
ister 00 in the ROM table into bits <7:5> in regis-
ter 08 to set the proper power-detector
response.
d) The baseband filter is factory-trimmed to have a
typical bandwidth (-3dB corner) at 0.8 MHz. The
information is stored in bits <2:0> of register 04
in the ROM table. The EV kit software automati-
cally loads the information stored in bits <2:0> of
register 04 in the ROM table into bits <2:0> in
register 08 to set proper baseband filter band-
width.
e) The VCO Auto Selection (VAS) is already
enabled through default settings (this allows the
software to pick the appropriate VCO sub-band
for the desired operation frequency). If desired,
the VAS can be turned off to manually select the
desired sub-band. VAS can be disabled through
the VAS_EN bit on the
Registers
or
Block
sec-
tion of the software.
9) Activate and set the power level of the RF generator
to achieve 1V
P-P
at the IF connector output or
0.5V
P-P
(-2dBm) when loaded by a 50Ω instrument.
Evaluates: MAX2170
Procedure
Measurement Considerations
The MAX2170 EV kit includes an on-board buffer that
converts the baseband differential outputs to a single-
ended output (see Figure 1 for details). The buffer is
configured for a gain of one. The output of the buffer
consists of a 50Ω resistor in series for matching to RF
test equipment. Note that there is a 6dB loss at the out-
put if 50Ω test equipment is used. This loss must be
accounted for when measuring gain.
Connections and Setup
The MAX2170 EV kit is fully assembled and tested. This
section provides a step-by-step guide to operating the
EV kit and testing the device’s function.
Caution:
Do
not turn on the DC power or RF signal generators until
all connections are made:
1) Connect a DC supply set to +3.0V (through an
ammeter if desired) to the VCC and GND terminals
on the EV kit. Do not turn on the supply. Note that
VCC and VCC2 on the EV kit board are shorted
together through JP3.
2) Connect a DC supply set to +2.4V (maximum gain)
to the RFAGC terminal on the EV kit. Do not turn on
the supply.
3) Connect a DC supply set to +2.4V (maximum gain)
to the BBAGC terminal on the EV kit. Do not turn on
the supply.
_______________________________________________________________________________________
3
MAX2170 Evaluation Kit
Evaluates: MAX2170
Note the 6dB loss at the output ports of the EV kit
due to the 50Ω resistor in series at the buffer out-
puts and the 50Ω load of the test equipment.
Layout Issues
A good PCB is an essential part of an RF circuit design.
The EV kit PCB serves as a guide for laying out a board
using the MAX2170. Keep traces carrying RF signals
as short as possible to minimize radiation and insertion
loss. Use impedance control on all RF signal traces.
The exposed paddle must be soldered evenly to the
board’s ground plane for proper operation. Use abun-
dant vias beneath the exposed paddle and between RF
traces to minimize undesired RF coupling.
To minimize coupling between different sections of the
IC, each V
CC
pin must have a bypass capacitor with low
impedance to the closest ground at the frequency of
interest. Do not share ground vias among multiple con-
nections to the PCB ground plane. Refer to the
Layout
section of the MAX2170 data sheet for more information.
Gain Control
The RF and baseband VGA circuits of the MAX2170
are controlled independently through jumpers JP10
and JP4, respectively. Connecting pins 2-3 of JP10
closes the RF gain control loop. The MAX2170 EV kit
also implements a control loop for the baseband VGA
through shorting pins 1-2 of JP4. The HOLD_AGC con-
trols the MAX4729 analog switch (see Figure 1 for
schematic details). In typical applications, the demodu-
lator controls the baseband VGA. The analog switch
and the external AGC circuitry (Q1, Q2, and Q3) are
optional components and only needed when the
demodulator lacks a baseband AGC control circuit.
4
_______________________________________________________________________________________
MAX2170 Evaluation Kit
Evaluates: MAX2170
Figure 1. MAX2170 EV Kit Schematic
_______________________________________________________________________________________
5
单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
