SE4100L Datasheet, PDF (1/2 Pages) SiGe Semiconductor, Inc. – PointCharger™ GPS Receiver IC Preliminary Information

SE4100L
GPS Receiver IC
Applications
ƒ Mobile phone & PDA accessories
ƒ Portable navigation and personal security
ƒ Security systems
ƒ Asset tracking
ƒ Telematics equipment
Features
ƒ 35mW typical power consumption
ƒ Single conversion radio with integrated IF filters
ƒ On-chip, gain switchable LNA
ƒ Low LNA noise figure, 1.9 dB typ.
ƒ On chip crystal oscillator can be powered
up independently
ƒ Fully integrated VCO, resonator and PLL
ƒ Remote antenna current detection
ƒ 4x4 mm 24 pin QFN - Pb Free and RoHS
compliant package
Ordering Information
Type
SE4100L-R
Package
24 Pin QFN
Functional Block Diagram
Remark
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.
LNAIn
LNA
MixIn
RF Amp
Mixers IF Filter
AntOK
AntDetP
÷96
AntDetN
Xtal1
Ant current
monitor
Phase
Det.
~
Xtal2 Xtal
Oscillator
Vtune
~~~
I
Q
Quadrature
÷2
+45° / -45°
Phase
Σ ^{Shift /}
Combiner
D
Clk Q
~ ^VCO
D-type
DataOut
27-DST-02 ƒ Rev 2.4 ƒ May-26-2009
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