Maxim Integrated MAX2112EVKIT+ Manuale utente
Evaluates: MAX2112
MAX2112 Evaluation Kit
General Description
The MAX2112 evaluation kit (EV kit) simplies the test-
ing and evaluation of the IC direct-conversion tuner. The
evaluation kit is fully assembled and tested at the factory.
Standard 50Ω SMA and BNC connectors are included on
the EV kit for the inputs and outputs to allow quick and
easy evaluation on the test bench.
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 component list for the kit, and artwork
for each layer of the PCB.
Features
●Easy Evaluation of the MAX2112
● 50Ω RF Input SMA Connector
● 50Ω Baseband Output BNC Connector
●Single 3.3V ±5% Supply
●I2C 2-Wire Serial Interface
●All Critical Peripheral Components Included
● Fully Assembled and Tested
●PC Control Software
(available at www.maximintegrated.com/evkitsoft-
ware)
19-2071; Rev 2; 11/14
+Denotes lead(Pb)-free and RoHS compliant.
PART TYPE
MAX2112EVKIT+ EV Kit
DESIGNATION QTY DESCRIPTION
ADDR 0
Not installed, 3-pin (1 x 3) inline
header, 0.01in centers
Sullins PEC36SAAN
BB_I_O/P,
BB_Q_O/P 250Ω BNC PC mounts
Amphenol 31-5329-52RFX
BB_IN, BB_IP,
BB_QN, BB_QP,
CP_OUT,
J12, J13, J17,
REF_O/P, VGC
10 PC mini red test points
Keystone 5000
C1–C6, C9 7
1000pF ±10% ceramic capacitors
(0603)
Murata GRM188R71H102K
C7, C13, C19,
C20, C75 5
0.1µF ±10% ceramic capacitors
(0603)
Murata GRM188R71C104K
C8, C12,
C25–C30 0Not installed, capacitors
DESIGNATION QTY DESCRIPTION
C10, C11 2
0.047µF ±10% ceramic capacitors
(0603)
Murata GRM188R71C473K
C14 1
100pF ±5% ceramic capacitor
(0603)
Murata GRM1885C1H101J
C15 1
0.033µF ±10% ceramic capacitor
(0603)
Murata GRM188R71E333K
C16 1
2200pF ±5% ceramic capacitor
(0603)
Murata GRM188R71H222J
C17, C18 2
10µF ±10% tantalum capacitors
(C Case)
AVX TAJC016K016
C22 1 43.2Ω ±1% resistor (0603)*
C23, C24,
C71–C73 5
330pF ±5% ceramic capacitors
(0603)
Murata GRM1885C1H331J
Component List
Ordering Information
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Component Suppliers
Note: Indicate that you are using the MAX2112 when contacting these component suppliers.
DESIGNATION QTY DESCRIPTION
J6 1 DB25 right-angle male connector
AMP 5747238-4
JP_VCC,
VCC_BB,
VCC_DIG,
VCC_LO,
VCC_RF1,
VCC_RF2,
VCC_SYN,
VCC_VCO
0
Not installed, 2-pin (1 x 2) inline
headers, 0.01in centers
Sullins PEC36SAAN
L1 133pF ±5% capacitor (0603)
Murata GRM1885C1H330J
R2, R12,
R18–R20, R22,
R25, R27–R33
0Not installed, resistors
R3, R7,
R15–R17, R21 60Ω ±5% resistors (0603)*
R4, R13, R24 31kΩ ±5% resistors (0603)*
R5 1820Ω ±5% resistor (0603)*
R6 1390Ω ±5% resistor (0603)*
R8 186.6Ω ±1% resistor (0603)*
R9–R11, R41,
R42 5100Ω ±1% resistors (0603)*
R14, R43 25.1kΩ ±5% resistors (0603)*
R23, R26 2
0.1µF ±10% ceramic capacitors
(0603)
Murata GRM188R71C104K
R46, R47 22.7kΩ ±5% resistors (0603)*
DESIGNATION QTY DESCRIPTION
REF_INPUT 0
Not installed, SMA edge-mount
connector, round contact
Emerson 142-0701-801
RF_INPUT 1
SMA edge-mount connector,
round contact
Emerson 142-0701-801
U1 1DVBS tuner (28 TQFN-EP**)
Maxim MAX2112ETI+
U2, U4 0
Not installed, single-supply op amps
with R2R outputs
Maxim MAX4453ESA
U3 174LV07A hex buffer/driver OC
TI SN74LV07ADR
U5 0Not installed, open I/O comparator
Maxim MAX985
Y1 1
27MHz crystal
Citizen America 300-8571-1-ND
Digi-Key HCM49-27.000MABJ-UT
— 0
Not installed, shunts (JP_VCC,
VCC_BB, VCC_DIG, VCC_LO,
VCC_RF1, VCC_RF2, VCC_SYN,
VCC_VCO)
Shorting jumpers, 2 position
Sullins SSC02SYAN
— 1 PCB: MAX2112/20 EVALUATION
KIT+
SUPPLIER WEBSITE
AMP/Tyco Electronics www.tycoelectronics.com
Amphenol RF www.amphenolrf.com
AVX Corp. www.avxcorp.com
Digi-Key Corp. www.digikey.com
Emerson Network Power www.emersonnetworkpower.com
Keystone Electronics Corp. www.keyelco.com
Maxim Integrated Products, Inc. www.maxim-ic.com
Murata Americas www.murataamericas.com
Sullins Electronics Corp. www.sullinselectronics.com
Texas instruments www.ti.com
*Use lead-free parts only.
**EP = Exposed pad.
Component List (continued)
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Quick Start
Test Equipment Required
●MAX2112 EV kit
●Dual-output power supply capable of supplying up to
3.3V at > 160mA for VCC and 3V at > 50μA for VGC
gain control voltage
● RF signal generator capable of delivering at least
0dBm of output power at frequencies up to 2.175GHz
● RF spectrum analyzer capable of covering the
operating frequency range of the device
● PC laptop or tablet with Microsoft Windows XP®,
Windows® 7, 8 OS and a USB port
● USB-A male to USB-B male cable
● US keyboard
●Multichannel digital oscilloscope (optional)
● Network analyzer to measure return loss (optional)
●Ammeter to measure supply current (optional)
Procedure
The EV kit is fully assembled and factory tested. Follow
the instructions in the Connections and Setup section for
proper device evaluation.
Measurement Considerations
The EV kit includes on-board matching circuitry at the
MAX2112 RF input to convert the 50Ω source to a 75Ω
input. Note that the input power to the device must be
adjusted to account for the -6dB power loss of the match-
ing resistor network.
Connections and Setup
This section provides a step-by-step guide to testing the
basic functionality of the EV kit in UHF mode. Caution:
Do not turn on DC power or RF signal generators until
all connections are completed.
1) Verify that all jumpers are in place.
2) With its output disabled, connect the DC power sup-
ply to VGC set to 0.5V (maximum gain).
3) With its output disabled, set the DC power supply to
3.3V. Connect the power supply to the VCC (through
an ammeter if desired) and GND terminals on the EV
kit. If available, set the current limit to 200mA.
4) With its output disabled, set the RF signal generator
to a 955MHz frequency at -69dBm to account for the
6dB resistive pad loss. When measuring noise gure,
this 6dB must also be accounted for by subtracting
6dB from the measured noise gure, unless the pad
has been removed.
5) Connect the output of the RF signal generator to the
SMA connector labeled RF _INPUT on the evalua-
tion board.
6) Connect the PC to the INTF3000 interface board
using the USB-A male to USB-B male cable. On
INTF3000, place a jumper between pins 1-2 on JU1
(VBUS Pos). Connect the 25-pin connector of the
INTF3000 (J4) directly to the 25-pin connector on the
EV kit (J6).
7) Turn on the 3.3V VCC power supply, followed by the
3V gain-control power supply. The supply current
from the 3.3V VCC supply should read approximately
100mA, and the supply current from the 3V VGC
should read approximately 50μA. Be sure to adjust
the power supply to account for any voltage drop
across the ammeter.
8) Install and run the IC control software. Software
is available for download on the Maxim website at
www.maximintegrated.com/evkitsoftware.
9) Load the default register settings from the control
software by clicking Edit: Load Defaults. Set ICP =
1 and BBG[3:0] = 1011.
10) Connect the output to a spectrum analyzer or an
oscilloscope.
11) Enable the RF signal generator’s output.
12) Activate and set the power level of the RF generator
to achieve 1VP-P at the baseband BNC connector
outputs.
13) Check the I/Q outputs.
14) Observe the baseband output at 5MHz with 1VP-P.
Windows and Windows XP are registered trademarks and
registered service marks of Microsoft Corporation.
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Layout Considerations
The EV kit can serve as a guide for PCB layout. Keep RF
signal lines as short as possible to minimize losses and
radiation. Use controlled impedance on all high-frequency
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 for maximum heat
dissipation. Use abundant ground vias between RF traces
to minimize undesired coupling.
To minimize coupling between different sections of the
IC, the ideal power-supply layout is a star configuration,
which has a large decoupling capacitor at the central
VCC node. The VCC traces branch out from this node,
with each trace going to separate VCC pins of the IC.
Each VCC pin must have a bypass capacitor with a low
impedance to ground at the frequency of interest. Do not
share ground vias among multiple connections to the
PCB ground plane.
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 1. MAX2112 EV Kit Schematic
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 2. MAX2112 EV Kit PCB Layout—Component Placement Guide
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 3. MAX2112 EV Kit PCB Layout—Top
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 4. MAX2112 EV Kit PCB Layout—Bottom
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 5. MAX2112 EV Kit PCB Layout—Top Soldermask
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Evaluates: MAX2112
MAX2112 Evaluation Kit
Figure 6. MAX2112 EV Kit PCB Layout—Bottom Soldermask
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