MAX12000 Просмотр технического описания (PDF) - Maxim Integrated

Номер в каталоге

Компоненты Описание

Список матч

MAX12000

1575MHz GPS Front-End Amplifer

Maxim Integrated 

MAX12000

EVALUATION KIT AVAILABLE

1575MHz GPS Front-End Amplifier

General Description

The MAX12000 GPS front-end amplifier IC is designed

for marine GPS satellite navigation antenna modules or

for any application that needs to compensate for cable

losses from the GPS antenna to receiver. Two uncondi-

tionally 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 MAX12000 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 performance of the GPS

receiver. Additionally, a 3.4dB gain step is provided to

compensate for cable loss variation between different

applications.

The MAX12000 is designed to operate at the GPS fre-

quency of 1575MHz with a 34.8dB typical cascaded gain

and a 25mA supply current. The two LNA stages allow

the use of a wide range of GPS filter types for maximum

flexibility in system design. The final RF output pin, which

drives the cable to the GPS receiver, is also the pow-

er-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.

The GPS 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).

Applications

●● Marine GPS Receivers

Features

●● First Amp Noise Figure*: 1.0dB

●● High Gain**: 34.8dB

●● 3.4dB Gain Step

●● Integrated 50Ω Output Matching

●● 3.0V to 5.5V Supply Voltage Range

●● Small, Low-Cost Package (3mm x 3mm)

●● ESD Protected to ±1kV Human Body Model

*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

PART

TEMP RANGE

PIN-

PACKAGE

MAX12000ETB+

-40°C to +85°C 10 TDFN

+Denotes a lead(Pb)-free/RoHS-compliant package.

Typical Operating Circuit appears at end of data sheet.

Pin Configuration/Functional Diagram

TOP VIEW

+

RFIN2 1

GND 2

GND 3

EXTCAP/ALT_VCC 4

RFOUT2/VCC 5

MAX12000

AMP 2

AMP 1

DC

GENERATION

10 RFOUT1

9 GND

8 GND

7 GAIN_SELECT

6 RFIN1

TDFN

19-4021; Rev 1; 9/14

Share Link: