SE4150L Datasheet, PDF (1/2 Pages) SiGe Semiconductor, Inc. – GPS Receiver IC Preliminary Datasheet

SE4150L
GPS Receiver IC
Preliminary Datasheet
Applications
ƒ High sensitivity / low power GPS / A-GPS apps.
ƒ Personal Navigation Devices (PNDs) , mobile
phones, and GPS peripheral devices
Features
ƒ Single-conversion L1-band GPS radio with
integrated IF filter
ƒ Integrated LNA with high-gain (20 dB typ.) and low
NF (0.9 dB typ.)
ƒ Integrated antenna switching with active antenna
current detection
ƒ Low cascaded system noise figure of 1.2 dB typical
ƒ 2-bit SIGN & MAG digital IF output
ƒ 2.7 V - 3.6 V operation
ƒ Standby current <10 µA
ƒ Fully integrated PLL synthesizer, VCO & loop filter
compatible with 16.368 MHz ref. frequency
ƒ 4 x 4 x 0.9 mm 24 pin QFN
ƒ Pb-free, RoHS compliant and Halogen free
Ordering Information
Part No.
Package
SE4150L-R 24 pin QFN
Remark
Shipped in Tape & Reel
Functional Block Diagram
Optional
filter
ANT_SW_OUT
MIX_IN
Product Description
The SE4150L is a highly integrated GPS receiver IC
offering high performance and low-power operation in a
wide range of low-cost applications. It is particularly
well-suited to high sensitivity L1-band GPS systems.
The SE4150L is ideal for use in GPS receivers needing
dual-antenna inputs. The SE4150L includes two RF
inputs with integrated antenna switching and external
active-antenna current detection. A high-linearity on-
chip LNA is used with one of the inputs, allowing the
SE4150L to be used in multi-function wireless systems,
without the need for additional external LNA devices. A
fully integrated image-reject low-IF mixer is used with a
linear AGC, an on-chip IF filter, and a 2-bit analogue-to-
digital converter (ADC).
The SE4150L features two gain control modes, to
optimize the performance of the LNA and mixer for
systems which either require high signal handling, or
systems which need minimal supply current.
The SE4150L synthesizer is fully integrated including
the VCO and PLL loop-filter. The synthesizer can
operate from a 16.368 MHz reference frequency,
normally with an external TCXO.
The SE4150L is optimized for operation from a 3.3 V
core power supply. It incorporates current-controlled
low-spurious output buffers which may operate from a
separate external supply. Output buffers supply
sufficient current to drive up to 15 pF load directly.
VAGC
LNA_IN
ANT1_IN
To External Active
Antenna
ANT_BIAS
ANT_FEED
ANT_DET
LNA
LNA Gain
LN
Buffer
Mix Gain
I
Q
IF Filter
~~~
-45°
+45°
Filter Gain
AGC
Controller
ADC
Antenna
Current
Detect
SE4150L
PLL Loop
Filter
Quadrature
÷2
~ ^PLL
VCO
Charge
Pump
Feedback
Divider
Phase /
Freq.
Detector
Reference
Buffer
Chip
Control
DST-00176 ƒ Rev 2.7 ƒ May-26-2009
TCXO IN VCC_TCXO
MAG
SIGN
CLK_OUT
HW_0
HW_1
CLK_EN
RX_EN
RVI
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