23.5MHz to 6000MHz Fractional/Integer-N Synthesizer/VCO

 

Part Number	Replacement	Explanation

Description

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The MAX2871 is an ultra-wideband phase-locked loop (PLL) with integrated voltage control oscillators (VCOs) capable of operating in both integer-N and fractional-N modes. When combined with an external reference oscillator and loop filter, the MAX2871 is a high-performance frequency synthesizer capable of synthesizing frequencies from 23.5MHz to 6.0GHz while maintaining superior phase noise and spurious performance.

The ultra-wide frequency range is achieved with the help of multiple integrated VCOs covering 3000MHz to 6000MHz, and output dividers ranging from 1 to 128. The device also provides dual differential output drivers, which can be independently programmed to deliver -1dBm to +8dBm output power. Both outputs can be muted by either software or hardware control.

The MAX2871 is controlled by a 4-wire serial interface and is compatible with 1.8V control logic. The device is available in a lead-free, RoHS-compliant, 5mm x 5mm, 32-pin TQFN package, and operates over an extended -40°C to +85°C temperature range.

The MAX2871 has an improved feature set and better overall phase noise and is fully pin- and software-compatible with the MAX2870.

What are the differences between MAX2870 and MAX2871? ›

MAX2871: Functional Diagram Enlarge+

Key Features

• Output Binary Buffers/Dividers Enable Extended Frequency Range
  • Divider Ratios of 1/2/4/8/16/32/64/128
  • 23.5MHz to 6000MHz
• High-Performance Phase Frequency Detector (PFD) and Reference Frequency Reduces Spectral Noise
  • PFD Up to 140MHz
  • Reference Frequency Up to 210MHz
• Low Normalized Inband Phase Noise of -230dBc/Hz Reduces System Noise Floor Contribution
• Manual or Automatic VCO Selection Permits Fast Switching
• Output Phase Reset and Adjustment Allow Synchronization of Multiple Synthesizers
• On-Chip Temperature Sensor with 7-Bit ADC Ensures Optimum VCO Selection
• Cycle Slip Reduction and Fast Lock Features Improve Accuracy and Acquisition Time
• VCO Lock Maintained Over Entire Temperature Range Provides Glitch-Free Operation
• Dual Differential Programmable Outputs Maximize Flexibility of Use

Applications/Uses

• Clock Generation
• Microwave Radios
• Test and Measurement
• Wireless Infrastructure