MAX2870 Frequency Synthesizer

By Maxim Integrated 303

MAX2870 Frequency Synthesizer

Maxim Integrated's MAX2870 is an ultra-wideband phase-locked loop (PLL) with integrated voltage-controlled oscillators (VCOs) capable of operating in both integer-N and fractional-N modes. When combined with an external reference oscillator and loop filter, the MAX2870 is a high-performance frequency synthesizer capable of synthesizing frequencies from 23.5 MHz to 6.0 GHz while maintaining superior phase noise and spurious performance.

The ultra-wide frequency range is achieved with the help of multiple integrated VCOs covering a range from 3000 MHz to 6000 MHz, and output dividers ranging from 1 to 128. The device also provides dual differential output drivers, which can be independently programmable to deliver -4 dBm to +5 dBm output power. Both outputs can be muted by either software or hardware control.

The MAX2870 is controlled by a 3-wire serial interface and is compatible with 1.8 V control logic. The device is available in a lead-free, RoHS-compliant, 5 mm x 5 mm, 32-pin TQFN package, and operates over an extended -40°C to +85°C temperature range.

  • Integer and Fractional-N Modes
  • Manual or automatic VCO selection
  • 3000 MHz to 6000 MHz fundamental VCO
  • Output binary buffers/dividers for extended frequency range
    • 1/2/4/8/16/32/64/128
    • 23.5 MHz to 6000 MHz
  • High-performance PFD
    • 105 MHz in integer-N mode
    • 50 MHz in fractional-N mode
  • Operates from +3.0 V to +3.6 V supply
  • Analog and digital lock detect indicators
  • Hardware and software shutdown control
  • Compatible with 1.8 V control logic
  • Clock generation
  • Military and aerospace
  • PMAR/LMAR/public safety radio
  • Satellite communications
  • Test and measurement
  • Wireless infrastructure
  • Wireless LANs/CATV

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