300MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers

The MAX2640/MAX2641 are low-cost, ultra-low-noise amplifiers designed for applications in the cellular, PCS, GPS, and 2.4GHz ISM frequency bands. Operating from a single +2.7V to +5.5V supply, these devices consume only 3.5mA of current while providing a low noise figure, high gain, high input IP3, and an operating frequency range that extends from 300MHz to 2500MHz.

The MAX2640 is optimized for 300MHz to 1500MHz applications, with a typical performance of 15.1dB gain, input IP3 of -10dBm, and a noise figure of 0.9dB at 900MHz. The MAX2641 is optimized for 1400MHz to 2500MHz applications, with a typical performance of 14.4dB gain, an input IP3 of -4dBm, and a noise figure of 1.3dB at 1900MHz.

These devices are internally biased, eliminating the need for external bias resistors and chokes. In a typical application, the only external components needed are a two-element input match, input and output blocking capacitors, and a VCC bypass capacitor.

The MAX2640/MAX2641 are designed on a high-frequency, low-noise, advanced silicon-germanium process and are offered in the space-saving 6-pin SOT23 package.

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Applications

* 400MHz/900MHz/2.4GHz ISM-Band Radios

* Cellular/PCS Handsets

* Cordless Phones

* GPS Receivers

* Wireless Data

* Wireless Local Area Networks (WLANs)

* Wide Operating Frequency Range

* MAX2640: 300MHz to 1500MHz

* MAX2641: 1400MHz to 2500MHz

* Low Noise Figure

* MAX2640: 0.9dB at 900MHz

* MAX2641: 1.2dB at 1575MHz

1.3dB at 1900MHz

1.5dB at 2450MHz

* High Gain

* MAX2640: 15.1dB at 900MHz

* MAX2641: 15.7dB at 1575MHz

14.4dB at 1900MHz

13.5dB at 2450MHz

* High Reverse Isolation

* MAX2640: 40dB at 900MHz

* MAX2641: 31dB at 1575MHz

30dB at 1900MHz

24dB at 2450MHz

* +2.7V to +5.5V Single-Supply Operation

* Low 3.5mA Supply Current

* Ultra-Small SOT23-6 Package