MAX2745 Evaluation Kit

2

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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.

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.

Component List (continued)

DESIGNATION

QTY

DESCRIPTION

L58

1

8.2nH

±0.1nH (0402) inductor

Murata LQP15MN8N2B02

L60

0***

Open

±0.1nH (0402) inductor

Murata

R1

1

70k

Ω ±1% (0402), 1/16W resistor

R5, R8

2

820

Ω ±1% (0402), 1/16W resistors

R6, R18, R19,

R20, R27, R69,

R70, R77

80

Ω ±1% (0402), 1/16W resistors

R9

1

100k

Ω ±1% (0402), 1/16W resistor

R10–R13

4

200

Ω ±1% (0402), 1/16W resistors

R14–R17

4

10k

Ω ±1% (0402), 1/16W resistors

R22–R25

0**

Open,

±1%, 1/16W resistors

R59

0***

Open,

±1% (0402), 1/16W resistor

R62

1

22.1k

Ω ±1% (0402), 1/16W resistor

R71

1

220

Ω ±5% (0402), 1/10W resistor

R79–R86

8

30k

Ω ±1% (0402), 1/16W resistors

DESIGNATION

QTY

DESCRIPTION

S2, S3

2

DIP switches SW4 SMT

CTS 204-12ST

TP1–TP5

5

Test points, PC mini, 0.040 red

Digi-key 5000K-ND

U1

0***

Open TXCO, 16.367667MHz, SM

Rakon

U3

1

MAX2745ECM IC, GPS RF, SM

Maxim MAX2745ECM

U4

1

MAX8510EXK27 low-noise linear

regulator

Maxim MAX8510EXK27

U12

1

Hex buffer/driver with open drain

Texas Instruments SN74LV07ADR

Y1

1

16.368327MHZ XTL

Rakon IDD30UM-1SJ

16.367MHz/XZB548

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

**These components are for internal test purposes.

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