Maxim Integrated MAX2112EVKIT+ Bedienungsanleitung

Evaluates: MAX2112

MAX2112 Evaluation Kit

General Description

The MAX2112 evaluation kit (EV kit) simplies 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

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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