Maxim Integrated Products has unveiled the new MAX7034 low-power superheterodyne receiver for amplitude-shift-keying (ASK) applications from 300 to 450 MHz. The integrated circuit (IC) requires only a few additional components to create a complete receive-chain solution. The IC includes a low-noise amplifier (LNA), image-reject mixer, phase-locked-loop (PLL) circuitry, 10.7-MHz intermediate-frequency (IF) filter, and additional analog and baseband data-recovery circuitry. It achieves 44-dB image rejection and -114-dBm sensitivity and is ideal for applications in home security systems, remote-keyless-entry (RKE) systems, and garage-door openers.
The MAX7034 operates from a single +5-VDC supply, and draws less than 3.0 microamps of current in shutdown mode and only 6.7 mA current in receive mode. The input impedance of the LNA can be adjusted by varying the off-chip degeneration inductor, allowing it to accommodate a wide range of antenna designs. The receiver is supplied in a 28-pin TSSOP package with prices starting at $2.50 (1000 quantity).