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STW81102：Multi-band RF frequency synthesizer with integrated VCOs

The STMicroelectronics STW81102 is an integrated RF synthesizer with voltage controlled oscillators (VCOs). Showing high performance, high integration, low power, and multi-band performances, the STW81102 is a low-cost one-chip alternative to discrete PLL and VCOs solutions.

The STW81102 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 subbands) and multiple output options (direct output, divided by 2 or divided by 4) allows coverage from 750 MHz to 905 MHz and 1000MHz to 1162.5 MHz, from 1500MHz to 1810 MHz and 2000 MHz to 2325MHz, from 3000 MHz to 3620 MHz and 4000MHz to 4650 MHz bands.

The STW81102 is designed with STMicroelectronics advanced 0.35µm 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\t3000 - 3620 MHz (Direct output)\t\t4000 - 4650 MHz (Direct output)\t\t1500 - 1810 MHz (Internal divider by 2)\t\t2000 - 2325 MHz (Internal divider by 2)\t\t750 - 905 MHz (Internal divider by 4)\t\t1000 - 1162.5 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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