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PDF SE4100L Data sheet ( Hoja de datos )

Número de pieza SE4100L
Descripción PointCharger GPS Receiver IC Preliminary Information
Fabricantes SiGe Semiconductor Inc. 
Logotipo SiGe Semiconductor  Inc. Logotipo



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No Preview Available ! SE4100L Hoja de datos, Descripción, Manual

SE4100L
PointCharger™ GPS Receiver IC
Preliminary Information
Applications
Mobile phone & PDA accessories
Portable navigation
Personal security
Security systems
Asset tracking
Telematics equipment
Features
30 mW power consumption
4x4mm 24 pin LPCC package
Single conversion radio with integrated IF filters
On-chip, Gain switchable LNA
Low LNA noise figure, 1.3dB typ.
On chip crystal oscillator can be powered up
independently
Fully integrated VCO, VCO tank circuit and PLL.
Remote antenna current detection
Ordering Information
Type
SE4100L-R
Package
24 Pin LPCC
Remark
Shipped in
Tape & Reel
Product Description
The SE4100 is an integrated GPS receiver designed to
receive the L1 signal at 1575.42MHz. The receiver has
a low IF architecture, and integrates all of the amplifier,
oscillator, mixer and demodulation functions.
The external component count is low, requiring just a
16.368MHz crystal and 11 passive components in its
minimum configuration. This and the 24 pin LPCC
package result in a very small circuit footprint, which is
complemented by just 30mW operating power.
Two digitally controlled shutdown modes enable either
to part to be powered down entirely or for just the 16
MHz clock supply to the baseband processor to be
maintained.
A switchable gain LNA enables the SE4100 to be used
with a local passive antenna or with a remote active
antenna without changing the circuit configuration. The
on-chip VCO and PLL generates the required LO
frequency from the external 16.368MHz crystal. All of
the VCO and LO chain is integrated. An image reject
mixer downconverts the RF signal to a 4.092MHz 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 at CMOS levels.
Functional Block Diagram
LNAIn
SE4100 Block Diagram
~~~ MixIn
LNA
RF Amp
Mixers IF Filter
AntOK
AntDetP
AntDetN
Xtal1
Ant current
monitor
~
Phase
Det.
Xtal2 Xtal
Oscillator
Vtune
÷96
~~~
IQ
Quadrature
÷2
~ VCO
+45° / -45°
Phase
Shift /
Combiner
Σ
D
Clk Q
D-type
DataOut
27-DST-01 Rev 1.3 Aug 6/02
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SE4100L pdf
The filter type chosen should require a termination
impedance of 50+j0. Examples of suitable types are
shown on the application schematic diagram.
The PCB layout should keep the track from the filter
to the MixIn pin as short as possible to minimize
pickup and mismatch (if the track is not 50). A dc
blocking capacitor should be used, even if the filter
does not present a dc path, as the MixIn pin has 0.4V
dc present which may be detrimental to the filter.
A filter will improve the performance of the receiver in
the presence of out of band blocking signals, but is
not essential if operation in the presence of such
signals is not critical. If the filter is not fitted, the
LNAOut pin should be connected to the MixIn pin via
a coupling capacitor.
PLL and Loop Filter
The entire phase-locked loop generating the local
oscillator for the mixer is contained on-chip, with the
exception of the loop filter.
Values provided on the application circuit should be
used, as these will provide optimum performance
under all conditions.
The capacitors may be ceramic dielectric types, with
either COG/NP0 or X7R dielectric. Higher
capacitance per unit volume dielectrics should be
avoided as the absolute tolerance and temperature
stability may compromise system performance.
SE4100L
PointCharger™ GPS Receiver IC
Preliminary Information
The PCB layout should keep the track from the Vtune
pin to the loop filter as short as possible to minimize
noise pickup.
Crystal Oscillator
The crystal oscillator is a Pierce configuration, as
shown in the diagram below. The application circuit is
designed to work with parallel resonant crystals with a
load capacitance of 12pF.
Xtal1
Xtal2
The PCB layout should minimize the lengths of the
tracks to Xtal1 and Xtal2 pins. The capacitors at each
terminal of the crystal should be mounted adjacent to
the crystal and have a low impedance connection to
the ground plane.
27-DST-01 Rev 1.3 Aug 6/02
5 of 16

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SE4100L arduino
Figure 1: Typical Schematic Diagram
SE4100L
PointCharger™ GPS Receiver IC
Preliminary Information
Die pad
27-DST-01 Rev 1.3 Aug 6/02
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