10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs

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.

Applications

* 900MHz Cordless Phones * 900MHz ISM-Band Applications * Analog Cellular Phones * Digital Cellular Phones * Land Mobile Radios * Narrow-Band PCS (NPCS)

* 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)