400 MHz to 4000 MHz

Low Noise Amplifier

ADL5523

Rev. A

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FEATURES

Operation from 400 MHz to 4000 MHz

Noise figure of 0.8 dB at 900 MHz

Requires few external components

Integrated active bias control circuit

Integrated dc blocking capacitors

Adjustable bias for low power applications

Single-supply operation from 3 V to 5 V

Gain of 21.5 dB at 900 MHz

OIP3 of 34.0 dBm at 900 MHz

P1dB of 21.0 dBm at 900 MHz

Small footprint LFCSP

Pin-compatible version with 20.8 dB gain available

FUNCTIONAL BLOCK DIAGRAM

1

VBIAS

2

RFIN

3

NC

4

NC

7RFOUT

8VPOS

6NC

5NC

ACTIVE

BIAS

ADL5523

NC = NO CONNECT

Figure 1.

GENERAL DESCRIPTION

The ADL5523 is a high performance GaAs pHEMT low noise

amplifier. It provides high gain and low noise figure for single-

downconversion IF sampling receiver architectures as well as

direct-downconversion receivers.

The ADL5523 provides a high level of integration by incorporating

the active bias and the dc blocking capacitors, making it very

easy to use while not sacrificing design flexibility.

The ADL5523 is easy to tune, requiring only a few external

components. The device can support operation from 3 V to 5 V,

and the current draw can be adjusted with the external bias

resistor for applications requiring very low power consumption.

The ADL5523 comes in a compact, thermally enhanced, 3 mm ×

3 mm LFCSP and operates over the temperature range of

−40°C to +85°C.

A fully populated evaluation board is also available.