Date: 10/08/2010

AM/FM variable gain low-noise amplifier for active car antenna applications from Maxim

Maxim has released the MAX2180, an AM/FM variable gain low-noise amplifier (LNA) for automotive active antenna applications. This LNA accepts separate AM and FM signal paths and delivers 30dB of gain range to each, controlled by individual on-chip power detectors. This fully integrated solution reduces BOM cost while ensuring optimized performance and carefree operation.

The MAX2180 has a self-controlled AGC loop that 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.

The AM signal path covers 148kHz to 30MHz input frequency range while the FM signal path covers 65MHz to 162.5MHz. The device integrates a voltage regulator and pass transistor, therefore allowing operation using battery voltages in the +8V to +24V range. On-chip thermal protection automatically limits junction temperatures during extreme thermal conditions. The MAX2180 is useful for applications such as hybrid or electric vehicles where sudden swings in supply are common.

Package: 4mm x 4mm TQFN package

Operating temperature range: -40°C to +85°C

Price: Start at US$2.57.

Available: Now