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STW81101：Multi-band RF frequency synthesizer with integrated VCOs

The STMicroelectronics STW81101 is an integrated RF synthesizer with voltage controlled oscillators (VCOs). Showing high performance, high integration, low power, and multi-band performances, STW81101 is a low-cost one-chip alternative to discrete PLL and VCO solutions.

The STW81101 includes an integer-N frequency synthesizer and two fully integrated VCOs featuring low phase-noise performance and a noise floor of -155 dBc/Hz. The combination of wide frequency range VCOs (using center-frequency calibration over 32 sub-bands) and multiple output options (direct output, divided by 2, or divided by 4) allows coverage of the 825 MHz-1100 MHz, 1650 MHz-2200 MHz and 3300 MHz-4400 MHz bands.

The STW81101 is designed with STMicroelectronics advanced 0.35 µm SiGe process.

Key Features

• Digital Lock Detector
• Programmable charge pump current
• 3.3V Power Supply
• Dual Digital Bus Interface: SPI and I2 C bus with 3 bit programmable address (1100A2 A1 A0 )
• Small size exposed pad VFQFPN28 package 5x5x1.0mm
• Power down mode (HW and SW)
• Process: BICMOS 0.35μm SiGe
• Programmable reference frequency divider (10 bits)
• 2 programmable counters to achieve a feedback division ratio from 256 to 65551 (prescaler 16/17) and from 361 to 77836 (prescaler 19/20).
• Integer-N Frequency Synthesizer
• Excellent integrated phase noise
• Dual differential integrated VCOs with automatic center frequency calibration:\t\t3300 - 3900 MHz (Direct output)\t\t3800 - 4400 MHz (Direct output)\t\t1650 - 1950 MHz (Internal divider by 2)\t\t1900 - 2200 MHz (Internal divider by 2)\t\t825 - 975 MHz (Internal divider by 4)\t\t950 - 1100 MHz (Internal divider by 4)\t\t
• Dual modulus programmable prescaler (16/17 or 19/20)
• Phase frequency comparator and charge pump
• Fast lock time: 150μs

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