CMOS AM/FM LNA integrates adjustable gain control for active car antenna applications

24th January 2011
Posted By : ES Admin
Maxim's new LNA, the MAX2180, integrates an AGC circuit to optimize car antenna reception while reducing solution size and cost.
Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX2180, a low-noise amplifier (LNA) with integrated automatic gain control (AGC) for automotive antenna applications. Fabricated using Maxim's advanced CMOS process, the LNA accepts separate AM and FM signal paths and delivers 30dB of gain range to each. This fully integrated solution reduces BOM cost while ensuring optimized performance and carefree operation.

The MAX2180 is designed to operate from 148kHz to 162.5MHz and incorporates many features that advance current antenna architectures. This LNA also reduces solution size and complexity. The self-controlled AGC loop includes on-chip power detectors to ensure that the signal level within each channel is continually optimized to negate the effects of antenna mobility. This design eliminates the need for external PIN diodes and associated driver circuits. A voltage regulator and pass transistor provide a stable supply over a wide 8V to 24V voltage range. A wide voltage range can be particularly useful in applications such as hybrid or electric vehicles where sudden swings in supply are common.

The MAX2180 also provides on-chip thermal protection that automatically limits junction temperatures during extreme thermal conditions. Available in a small (4mm x 4mm) TQFN package, the device is fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range. Prices start at $2.57 (1000-up, FOB USA), and samples are available upon request.

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