MAX2371/MAX2373 are wideband low-noise amplifier (LNA) ICs designed for direct conversion receiver (DCR) or very low intermediate frequency (VLIF) receiver applications. They contain single-channel, single-ended LNA with switchable attenuator and automatic gain con- trol (AGC) intended as a low-noise gain stage. These devices provide high gain-control range (typically 60dB) at radio frequency (RF) with excellent noise and reverse isolation characteristics. The MAX2371/MAX2373 can work over the frequency range from 100MHz to 1GHz. In practice, only a narrow band is needed in each application, so different matching circuits can be applied. The devices are dynamically con- figured through the digital/analog control pins to select either maximum gain and low noise figure or power-saving mode. In addition, the MAX2371/MAX2373 feature high/low-current modes, high/low attenuation modes, lin- early controlled gain states, and shutdown mode.
The MAX2371 and MAX2373 are single‑channel, single‑ended low‑noise amplifiers (LNA) intended for direct‑conversion (DCR) and very‑low‑IF (VLIF) receiver applications. They feature a switchable attenuator, automatic gain control (AGC), and two gain modes that can be selected via digital/analog control pins. The devices operate from 100 MHz to 1 GHz and provide a typical gain‑control range of 60 dB.
The datasheet includes absolute maximum ratings, DC and AC electrical characteristics, typical operating curves, pin descriptions, and layout recommendations. Power‑supply bypassing, matching network design, and shutdown operation are also covered to aid designers in integrating the LNA into RF front‑ends.
| Operating Frequency Range | 100 MHz – 1 GHz |
|---|---|
| Gain‑Control Range | typical 60 dB |
| Typical Noise Figure | 1.8 dB |
| Supply Voltage (VCC) | 2.65 V – 3.30 V |
| Reverse Isolation | 40 dB |
| AGC Range (excluding step attenuator) | 45 dB |
The devices operate from 100 MHz up to 1 GHz.
The LNA can be shut down by setting the RX_EN pin low or by using the built‑in shutdown mode.
The recommended supply voltage is between 2.65 V and 3.30 V.
The typical noise figure is 1.8 dB.