Page 1
MAX2121 Evaluation Kit
Evaluates: MAX2121
General Description
The MAX2121 evaluation kit (EV kit) simplifies the testing and evaluation of the IC direct-conversion tuner. The
evaluation kit is fully assembled and tested at the factory.
Standard 50I 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.
DESIGNATION QTY DESCRIPTION
Not installed, 3-pin (1 x 3) inline
ADDR 0
CP_OUT, J13,
REF_O/P, VGC
C1–C6, C9 7
C7, C13, C20,
C21, C25, C26,
C27, C75
C8, C12, C30 0 Not installed, capacitors
C10, C11 2
C14 1
C15 1
C16 1
header, 0.01in centers
Sullins PEC36SAAN
PC mini red test points
4
Keystone 5000
1000pF Q10% ceramic
capacitors (0603)
Murata GRM188R71H102K
0.1FF Q10% ceramic capacitors
8
(0603)
Murata GRM188R71C104K
0.047FF Q10% ceramic
capacitors (0603)
Murata GRM188R71C473K
100pF Q5% ceramic capacitor
(0603)
Murata GRM1885C1H101J
0.033FF Q10% ceramic capacitor
(0603)
Murata GRM188R71E333K
2200pF Q5% ceramic capacitor
(0603)
Murata GRM188R71H222J
Features
S Easy Evaluation of the MAX2121
S 50I RF Input SMA Connector
S 50I Baseband Output BNC Connector
S Single 3.3V ±5% Supply
S I2C 2-Wire Serial Interface
S All Critical Peripheral Components Included
S Proven PCB Layout
S Fully Assembled and Tested
S PC Control Software
(Available at www.maximintegrated.com/evkitsoftware)
Ordering Information appears at end of data sheet.
Component List
DESIGNATION QTY DESCRIPTION
10FF Q10% tantalum capacitor
C18 1
C23, C24, C71,
C72, C73
C28, C31 2
C32 1
IN, IP, QN, QP 4
J6 1
J17 1
JP1, JP2,
VCC_BB,
VCC_DIG,
VCC_LO,
VCC_RF1,
VCC_RF2,
VCC_SYN,
VCC_VCO
(C Case)
AVX TAJC016K016
330pF Q5% ceramic capacitors
5
(0603)
Murata GRM1885C1H331J
5pF Q0.25pF ceramic capacitors
(0603)
Murata GRM1885C1H5R0C
33pF Q5% capacitor (0603)
Murata GRM1885C1H330J
SMA PC top-mount connectors
Emerson 142-0701-201
DB25 right-angle male connector
AMP 5747238-4
PC mini black test point
Keystone 5001
Not installed, 2-pin (1 x 2) inline
0
headers, 0.01in centers
Sullins PEC36SAAN
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6059; Rev 1; 5/15
Page 2
MAX2121 Evaluation Kit
Evaluates: MAX2121
Component List (continued)
DESIGNATION QTY DESCRIPTION
R1, R12,
R13, R17
R2 0 Not installed, resistor
R3, R7,
R15, R16
R4 1
R5 1
R6 1
R8 1
R9, R10, R11,
R41, R42
R14, R43 2
R18 1
R46, R47 2
49.9I Q1% resistors (0603);
4
use lead-free parts only
0I Q5% resistors—short (0603);
4
use lead-free parts only
1kI Q5% resistor (0603);
use lead-free parts only
820I Q5% resistor (0603);
use lead-free parts only
390I Q5% resistor (0603);
use lead-free parts only
86.6I Q1% resistor (0603);
use lead-free parts only
100I Q1% resistors (0603);
5
use lead-free parts only
5.1kI Q5% resistors (0603);
use lead-free parts only
43.2I Q1% resistor (0603);
use lead-free parts only
2.7kI Q5% resistors (0603);
use lead-free parts only
DESIGNATION QTY DESCRIPTION
Not installed, SMA edge-mount
REF_INPUT 0
RF_INPUT 1
U1 1
U3 1
Y1 1
— 0
— 1 PCB: MAX2121 EVALUATION KIT#
connector, round contact
Emerson 142-0701-801
SMA edge-mount connector,
round contact
Emerson 142-0701-801
DVBS tuner (28 TQFN-EP)
Maxim MAX2121ETI+
74LV07A hex buffer/driver OC
TI SN74LV07ADR
27MHz crystal
Citizen America
HCM49-27.000MABJ-UT
Digi-Key 300-8571-1-ND
Not installed, shunts (JP1, JP2,
VCC_BB, VCC_DIG, VCC_LO,
VCC_RF1, VCC_RF2, VCC_SYN,
VCC_VCO)
Shorting jumpers, 2 position
Sullins SSC02SYAN
Component Suppliers
SUPPLIER PHONE WEBSITE
AMP/Tyco Electronics 800-522-6752 www.tycoelectronics.com
AVX Corporation 843-946-0238 www.avx.com
Citizen America Corp. 310-781-1460 www.citizencrystal.com
Digi-Key Corp. 800-344-4539 www.digikey.com
Emerson Network Power 507-833-8822 www.emersonnetworkpower.com
Keystone Electronics Corp. 209-796-2032 www.keyelco.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Sullins Electronics Corp. 760-744-0125 www.sullinselectronics.com
Note: Indicate that you are using the MAX2121 when contacting these component suppliers.
Quick Start
Test Equipment Required
• MAX2121 EV kit
• Dual-output power supply capable of supplying up
to 3.3V at > 160mA for VCC and 3V at > 50FA for
VGC gain-control voltage
• RF signal generator capable of delivering at least
0dBm of output power at frequencies up to 2.175GHz
Windows and Windows XP are registered trademarks of
Microsoft Corp.
• RF spectrum analyzer capable of covering the
operating frequency range of the device
• PC, laptop, or tablet with Windows XPM, WindowsM
7 or 8 operating system, 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)
2Maxim Integrated
Page 3
MAX2121 Evaluation Kit
Evaluates: MAX2121
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
MAX2121 RF input to convert the 50I source to a 75I
input. Note that the input power to the device must
be adjusted to account for the -6dB power loss of the
matching 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 supply
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
figure, this 6dB must also be accounted for by
subtracting 6dB from the measured noise figure,
unless the pad has been removed.
5) Connect the output of the RF signal generator to the
SMA connector labeled RF _INPUT on the evaluation
board.
6) Connect the PC to the INTF3000 Interface Board
using a USB A male to USB B male cable. On
INTF3000, place a jumper between pins 1-2 of JU1
(VBUS Pos). Connect a 25-pin connector of the
INTF3000 (J4) directly to the 25-pin connector of 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
150mA, and the supply current from the 3V VGC
should read approximately 50FA. 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 at www.maximintegrated.
com/evkitsoftware.
9) Load the default register settings from the control
software by clicking Edit: Load Defaults.
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 1V
QP/QN. Note that the intended 200I differential load is dependent on each baseband output
being properly terminated into 50I. For example,
terminate IP into a 50I spectrum analyzer and
terminate IN into 50I. The summation of these two
50I terminations and the two series 50I resistors
on the EV kit equates to the desired 200I differential
load. In this configuration, the 1V
voltage across IP/IN is reduced to 250mV
at the spectrum-analyzer input.
13) Check the I/Q outputs.
14) Observe the baseband output at 5MHz with differential 1V
P-P
.
differential across IP/IN or
P-P
differential
P-P
(-8dBm)
P-P
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 pad must be soldered evenly
to the board’s ground plane for proper operation. Use
abundant vias beneath the exposed pad 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 low
impedance to ground at the frequency of interest. Do
not share ground vias among multiple connections to the
PCB ground plane.
3Maxim Integrated
Page 4
MAX2121 Evaluation Kit
Evaluates: MAX2121
Figure 1. MAX2121 EV Kit Schematic
4Maxim Integrated
Page 5
MAX2121 Evaluation Kit
Evaluates: MAX2121
Figure 2. MAX2121 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX2121 EV Kit PCB Layout—Top
Figure 4. MAX2121 EV Kit PCB Layout—Bottom
5Maxim Integrated
Page 6
MAX2121 Evaluation Kit
Evaluates: MAX2121
Figure 5. MAX2121 EV Kit PCB Layout—Top Soldermask Figure 6. MAX2121 EV Kit PCB Layout—Bottom Soldermask
6Maxim Integrated
Page 7
Ordering Information
PART TYPE
MAX2121EVKIT# EV Kit
#Denotes RoHS compliant.
MAX2121 Evaluation Kit
Evaluates: MAX2121
7Maxim Integrated
Page 8
MAX2121 Evaluation Kit
Evaluates: MAX2121
Revision History
REVISION
NUMBER
0 11/11 Initial release —
1 5/15
REVISION
DATE
DESCRIPTION
Updated the Test Equipment Required and the Connections and Setup
sections
PAGES
CHANGED
2, 3
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 8
©
2015 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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