MAX2745ECM+D【PDF 1/9 页】IC GPS RF FRONT END 48TQFP

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Sheet目录473

[1页]2页 3页 4页 5页

19-3425; Rev 0; 10/04

ATION

AILABL

EVALU E

KIT

Single-Chip Global Positioning System

Receiver Front-End

General Description

The MAX2745 complete single-chip global positioning

system (GPS) RF front-end downconverter utilizes many

innovative and leading-edge RF CMOS design tech-

niques. This high-performance, state-of-the-art device

consumes extremely low power and eliminates the

need for costly SAW and bulky discrete IF filters. The

MAX2745 incorporates a fully integrated low-noise

amplifier (LNA) and mixer, IF section, digital sampler,

and local oscillator synthesizer. The MAX2745 also pro-

vides a voltage supply for an external LNA. In addition,

the MAX2745 features a voltage booster, which can

extend the power-supply voltage to as low as 1.6V.

The MAX2745 supports both 3rd overtone crystal

designs in 32MHz and fundamental frequency crystal

designs in 16MHz, as well as a TCXO implementation.

In addition, the MAX2745 incorporates an on-chip tem-

perature sensor and crystal oscillator with trimmed

capacitors, resulting in a very accurate frequency and

additional system cost savings.

Features

o Complete Single-Chip GPS Radio for 16.368MHz

and 32.736MHz Floorplans

o Single-Ended or Differential Outputs at 4.092MHz

o Low 3.5dB Typical Noise Figure

o No External IF SAW or Discrete Filters Required

o On-Chip Temperature Sensor

o 2.4V to 3.6V Operational Supply Voltage Range

o Power Consumption as Low as 41mW at 2.4V

o Wide -40°C to +85°C Operational Temperature

Range

Ordering Information

The MAX2745 is available in a space-saving 48-pin

TQFP package and is specified for the extended (-40°C

to +85°C) temperature range. The power consumption

PART

MAX2745ECM

* EP = Exposed paddle.

TEMP RANGE

-40 ° C to +85 ° C

PIN-PACKAGE

48 TQFP-EP*

of this device is as low as 41mW at 2.4V.

Typical Operating Circuit appears at end of data sheet

Applications

In-Vehicle Navigation Systems (IVNSs)

Location-Based Services (PDAs and

Accessories)

Block Diagram/

Pin Configuration

Telematics (Vehicle/Asset Tracking and

Inventory Management)

RBIAS 1

36 BPF_CTRL

Recreational Handheld/Walkie Talkies

CBIAS 2

VCXO

MAX2745

TEMPERATURE

SENSOR

35 ODS

Geographical Information Systems (GISs)

V DD 3

34 CFS

Emergency Roadside Assistance

Emergency Response Systems

Digital Cameras/Camcorders

Consumer Electronics

V DD 4

GND 5

GND 6

RFIN 7

BIAS

LNA/MIXER

PFD

DIVIDER

CHG

PUMP

VCO

VSPORT

33 COE

32 V DD

31 SCLK

30 GND

GND 8

V DD 9

29 VOUT+

28 VOUT-

IEXT_LNA 10

BANDPASS FILTER

AGC

QUANTIZER

VOLTAGE

27 V DD

V DD 11

AGC_FIL 12

FILTER AUTOMATIC TUNING

BOOSTER

26 GND

25 V DD

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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