SE4120L Datasheet, PDF (1/2 Pages) SiGe Semiconductor, Inc. – GNSS Receiver IC

SE4120L
GNSS Receiver IC
Applications
ƒ Dual-mode GPS and Galileo receivers
ƒ Software-defined GNSS radio systems
ƒ High sensitivity / low power GNSS / A-GNSS apps.
ƒ Portable navigation devices, mobile phones, and
GNSS peripheral devices
ƒ Telematics equipment
Features
ƒ Single conversion L1-band GPS/Galileo radio with
integrated IF filter
ƒ 2-bit serialized digital I/Q output at near-zero IF
ƒ Integrated LNA with high-gain (18.5 dB typ.) and
low NF (1.7 dB typ.)
ƒ Low 2.2 dB typ. RF system noise figure
ƒ Low 10 mA operating current with 2.7-3.6 V supply;
8 mA with internal LNA disabled
ƒ Low Standby current 3 μA typical
ƒ Fully integrated VCO and resonator
ƒ Integrated PLL supporting 16.368 MHz reference
frequency
ƒ I/O supply range extends down to 1.7 V
ƒ 4 x 4 mm 24 pin QFN, RoHS-compliant package
Ordering Information
Part No.
Package
Remark
SE4120L-R 24 Pin QFN Shipped in Tape & Reel
Functional Block Diagram
Product Description
The SE4120L is a highly-integrated GNSS radio front
end IC offering high performance and low power
operation in a wide range of low-cost applications. It
supports GPS and dual-mode L1-band GPS/Galileo
products. The SE4120L features a conditioned
interface for software implementations of GNSS
baseband signal processing.
The SE4120L includes an on-chip LNA, a low IF
receiver with a linear AGC and an advanced multi-bit
I/Q analog to digital converter (ADC) with serialized
data output. The receiver incorporates a fully integrated
image reject mixer, obviating the need for a SAW filter
in many applications. The SE4120L’s on-chip IF filter
may be adjusted from 2.2 MHz BW (for GPS only) to
4.4MHz BW (for simultaneous reception of Galileo and
GPS signals). The digitized I/Q output, centered near-
zero IF, is available in a serialized data stream to
facilitate software signal processing.
The highly-integrated PLL synthesizer of the SE4120L
requires only two passive components to implement an
off-chip loop filter.
The SE4120L is optimized for the lowest possible
power consumption consistent with a very low external
component count.
The SE4120L incorporates current-controlled low-
spurious output buffers which may be run from a
separate external supply to interface to low voltage
systems. Output buffers supply sufficient current to
drive most baseband devices directly.
Optional
filter
LNA_OUT
MIX_IN
VAGC
LNA_IN
Buffer
LNA
IF Filter
~~~
-45°
+45°
AGC
Controller
ADC
I
Q
SE4120
Quadrature
÷2
VCO
~
FILT_BW
Feedback
Divider
Phase/Frequency
Detector
Sample
Clock
divider
Reference
Divider
VTUNE
~ Reference
Oscillator
/ Buffer
PLL Loop
Filter
XTAL1/
TCXO IN
XTAL2
Data
Downconverter /
Serializer
Chip
Control
AGC_DIS
DATA_OUT
SYNC
CLK_OUT
FILT_BW
Fs_SEL1
Fs_SEL0
RX_EN
OSC_EN
RVI
.
DST-00059 ƒ Rev 3.5 ƒ May-26-2009
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