SE4100L

GPS Receiver IC

Applications

Mobile phone & PDA accessories

Portable navigation and personal security

Security systems

Asset tracking

Telematics equipment

Features

35mW typical power consumption

Single conversion radio with integrated IF filters

On-chip, gain switchable LNA

Low LNA noise figure, 1.9 dB typ.

On chip crystal oscillator can be powered

up independently

Fully integrated VCO, resonator and PLL

Remote antenna current detection

4x4 mm 24 pin QFN - Pb Free and RoHS

compliant package

Ordering Information

Type

Package

Remark

SE4100L-R

24 Pin QFN

Shipped in

Tape & Reel

Product Description

The SE4100L is an integrated GPS receiver designed

to receive the L1 signal at 1575.420 MHz. The receiver

has a low IF architecture and integrates all of the

amplifier, oscillator, mixer and IF sampling functions.

The high level of integration reduces the external

component count to just 14 passives in addition to

power supply de-coupling and a 16.368 MHz crystal.

Furthermore, elimination of the need for an external

VCO resonator and RF filter reduces the critical off-chip

RF circuitry to just three matching components to

achieve optimum noise match at the LNA input.

Combined with the 4x4 mm LPCC package, this results

in a very small circuit footprint with no need for electrical

screening in many applications.

The SE4100L’s small size and BOM requirement is

complemented by just 35 mW typical operating power

consumption.

Digitally

controlled

shutdown

modes

enable the 16.368 MHz clock signal to the baseband

processor to be maintained separately from operation of

the rest of the receiver.

A switchable gain LNA enables the SE4100L to be used

with either a local passive antenna or with a remote

active

antenna

without

changing

the

circuit

configuration. An image reject mixer downconverts the

RF signal to a 4.092 MHz IF. The integrated IF filter

feeds a combiner, limiter and output latch. The output

signal is a 1-bit quantized 4.092 MHz digital IF.

Functional Block Diagram

~

Phase

Det.

~

~

~

÷96

Quadrature

÷2

IQ

+45° / -45°

Σ

~

Q

Clk

D

MixIn

LNAIn

LNA

Xtal1

Xtal2

Xtal

Oscillator

VCO

DataOut

Phase

Shift /

Combiner

D-type

IF Filter

Mixers

RF Amp

Vtune

AntDetP

AntDetN

AntOK

Ant current

monitor

27-DST-02

Rev 2.4

May-26-2009

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