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MAX2640EUTT

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

Maxim Integrated 

MAX2640/MAX2641

300MHz to 2500MHz SiGe

Ultra-Low-Noise Amplifiers

Pin Description

IN

NAME

FUNCTION

1

RFIN

Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching

network (see Typical Operating Circuit).

2, 3, 5 GND Ground. For optimum performance, provide a low inductance connection to the ground plane.

4

RFOUT Amplifier Output. Use the recommended series blocking or matching capacitor (see Typical Operating Circuit).

Supply Voltage. Bypass to ground directly at the supply pin. The value of the bypass capacitor is determined by

6

VCC

the lowest operating frequency. Additional bypassing may be necessary for long VCC lines (see Typical Operating

Circuit).

Detailed Description

The MAX2640 and MAX2641 are ultra-low-noise ampli-

fiers that operate with RF input frequency ranges

of 300MHz to 1500MHz (MAX2640) or 1400MHz to

2500MHz (MAX2641). These devices are available in

SOT23-6 packages and contain internal bias circuitry to

minimize the number of required external components.

Their small size and low external component count make

them ideal for applications where board space is limited.

Applications Information

External Matching Components

The MAX2640/MAX2641 are easy to use, generally

requiring only five external components as shown in

the Typical Operating Circuit. To reduce external com-

ponent count further, replace external inductors with

microstrip transmission lines. The high reverse isola-

tion allows the tuning of the input matching network

without affecting the output match, and vice versa.

Select input and output matching networks to obtain the

desired combination of gain, noise figure, and return

loss performance. The Typical Operating Circuit show

the recommended input and output matching networks

for the MAX2640/MAX2641 at 900MHz and 1900MHz,

respectively. These values are optimized for best

simultaneous gain, noise figure, and return loss per-

formance. To aid in the design of matching networks

for other frequencies, Tables 1 and 2 list typical device

S-parameters and Tables 3 and 4 list typical device noise

parameters.

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