General Description

The MAX2620 combines a low-noise oscillator with two output buffers in a low-cost, plastic surface-mount, ultra-small µMAX package. This device integrates functions typically achieved with discrete components. The oscillator exhibits low-phase noise when properly mated with an external varactor-tuned resonant tank circuit. Two buffered outputs are provided for driving mixers or prescalers. The buffers provide load isolation to the oscillator and prevent frequency pulling due to load-impedance changes. Power consumption is typically just 27mW in operating mode (VCC = 3.0V), and drops to less than 0.3µW in standby mode. The MAX2620 operates from a single +2.7V to +5.25V supply.

Features

♦ Low-Phase-Noise Oscillator: -110dBc/Hz (25kHz offset from carrier) Attainable

♦ Operates from Single +2.7V to +5.25V Supply

♦ Low-Cost Silicon Bipolar Design

♦ Two Output Buffers Provide Load Isolation

♦ Insensitive to Supply Variations

♦ Low, 27mW Power Consumption (VCC = 3.0V)

♦ Low-Current Shutdown Mode: 0.1µA (typ)

Applications

  Analog Cellular Phones

  Digital Cellular Phones

  900MHz Cordless Phones

  900MHz ISM-Band Applications

  Land Mobile Radio

  Narrowband PCS (NPCS)