MAX2670 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – GPS/GNSS Front-End Amplifier ESD Protected to ±2kV Human Body Model

19-5655; Rev 0; 6/11
EVALUATION KIT AVAILABLE
MAX2670
GPS/GNSS Front-End Amplifier
General Description
The MAX2670 GPS/GNSS front-end amplifier IC is
designed for automotive and marine GPS/GNSS satellite
navigation antenna modules or for any application that
needs to compensate for cable losses from the antenna
to receiver. Two unconditionally stable low-noise amplifier
stages provide the high gain and integrated I/O matching
to minimize the need for external matching components
and eliminate the need for additional gain stages. The
device features the option to place a bandpass ceramic
or SAW filter between the two amplifier stages to provide
a narrow-band output to further improve the noise perfor-
mance of the GPS/GNSS receiver. Additionally, a 3.4dB
gain step is provided to compensate for cable loss varia-
tion between different applications.
The device is designed to operate across all GNSS fre-
quency standards with a 34.8dB typical cascaded gain
and a 25mA supply current. The two LNA stages allow
the use of a wide range of GNSS filter types for maxi-
mum flexibility in system design. The final RF output pin,
which drives the cable to the GNSS receiver, is also the
power-supply connection that accepts a DC supply in
the 3.0V to 5.5V range. Alternatively, the DC supply can
be applied to pin 4.
This GPS/GNSS front-end amplifier is designed on a low-
noise, advanced SiGe process and is available in a lead-
free, 10-pin TDFN surface-mount package (3mm x 3mm).
Features
S First Amplifier Noise Figure*: 1.0dB
S High Gain**: 34.8dB
S 3.4dB Gain Step
S Shared V_CC and RFOUT2 Pin
S Integrated 50I Output Matching
S 3.0V to 5.5V Supply Voltage Range
S Small, Low-Cost Package (3mm x 3mm)
S AEC-Q100 Qualified
S ESD Protected to ±2kV Human Body Model
Applications
Integrated Automotive and Marine GPS Receivers
Active Antennas
*Without external input impedance match.
**First amplifier input is impedance matched (S₁₁ = -10dB).
Second amplifier set to high gain. Amplifiers cascaded without
interstage filter.
Ordering Information appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Functional Diagram
TOP VIEW
+
RFIN2 1
GND 2
GND 3
EXTCAP/ALT_VCC 4
RFOUT2/VCC 5
MAX2670
10 RFOUT1
AMP 2
AMP 1
DC
GENERATION
9 GND
8 GND
7 GAIN_SELECT
6 RFIN1
TDFN
For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX2670.related.
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
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