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MAX2745EVKIT

MAX2745 Evaluation Kit

Maxim Integrated 

MAX2745 Evaluation Kit

Component List (continued)

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

L58

1 8.2nH ±0.1nH (0402) inductor

Murata LQP15MN8N2B02

S2, S3

2 DIP switches SW4 SMT

CTS 204-12ST

L60

0*** Open ±0.1nH (0402) inductor

Murata

TP1–TP5

5

Test points, PC mini, 0.040 red

Digi-key 5000K-ND

R1

R5, R8

1 70kΩ ±1% (0402), 1/16W resistor

2 820Ω ±1% (0402), 1/16W resistors

U1

0***

Open TXCO, 16.367667MHz, SM

Rakon

R6, R18, R19,

R20, R27, R69,

R70, R77

R9

R10–R13

R14–R17

R22–R25

R59

R62

R71

R79–R86

8 0Ω ±1% (0402), 1/16W resistors

1 100kΩ ±1% (0402), 1/16W resistor

4 200Ω ±1% (0402), 1/16W resistors

4 10kΩ ±1% (0402), 1/16W resistors

0** Open, ±1%, 1/16W resistors

0*** Open, ±1% (0402), 1/16W resistor

1 22.1kΩ ±1% (0402), 1/16W resistor

1 220Ω ±5% (0402), 1/10W resistor

8 30kΩ ±1% (0402), 1/16W resistors

U3

1

MAX2745ECM IC, GPS RF, SM

Maxim MAX2745ECM

MAX8510EXK27 low-noise linear

U4

1 regulator

Maxim MAX8510EXK27

U12

1 Hex buffer/driver with open drain

Texas Instruments SN74LV07ADR

16.368327MHZ XTL

Y1

1 Rakon IDD30UM-1SJ

16.367MHz/XZB548

**These components are for internal test purposes.

***These are the optional components. See the instructions on the schematic for more details.

Detailed Description

The MAX2745 EV kit simplifies evaluation of the

MAX2745 GPS RF front-end IC. It enables testing of the

device’s RF performance and requires no additional

support circuitry. The EV kit’s signal inputs and outputs

use SMA connectors to facilitate the connection of RF

test equipment. In this section, detailed descriptions of

the EV board as well as the control interface/software

are given to facilitate better evaluation of the IC.

DC Power Supply

The MAX2745 EV kit requires three different pow-

er supplies:

• VINDC (JP3) is the main power supply for the

MAX2745 IC and the external RF circuitry such as

the TCXO. This VINDC supply powers the MAX8510

LDO, which produces 2.85V output with extremely

low noise. If different supply voltages are desired to

test the IC, bypass the LDO and directly power the

board through JP2. See the Jumper Description sec-

tion for more details.

• VDD18 (JP1) is the 1.6V to 2.3V supply voltage

needed to test the voltage booster section. Do not

use VDD18 for normal operation. See the Jumper

Description section for more details.

• VDD5V (JP12) is the power supply for the I2C* con-

trol interface. It is not required if the control interface

is not used.

I/O Ports

The MAX2745 EV kit has one RF input port, three IF out-

put ports, one clock output port, and one PC control port.

• RF_IN (J24) is the GPS RF signal input port with

SMA connector.

• VCMOUT_1P/VCMOUT_1N/DOUT are the IF out-

put ports.

• CKOUT is the 16MHz/32MHz clock output port.

• J5 is the 25-pin PC parallel control port.

Digital Controls

There are two DIP switches (S2, S3) on the MAX2745

EV kit that provide eight digital controls. Refer to the

MAX2745 data sheet for more details.

*Purchase of I2C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associate Companies, conveys

a license under the Philips I2C Patent Rights to use these com-

ponents in an I2C system, provided that the system conforms

to the I2C Standard Specification as defined by Philips.

2 _______________________________________________________________________________________

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