MAX2670GTB+TW【PDF 1/9 页】IC FRONT-END AMP GPS/GNSS 10TDFN

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Sheet目录473

[1页]2页 3页 4页 5页

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 50 I 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 (S 11 = -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

MAX2670

10 RFOUT1

GND

EXTCAP/ALT_VCC

RFOUT2/VCC

AMP 2

GENERATION

AMP 1

GND

GAIN_SELECT

RFIN1

TDFN

For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX2670.related .

????????????????????????????????????????????????????????????????? Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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