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STW82101B：RF down converter with embedded integer-N synthesizer

The STMicroelectronics STW82101B is an integrated down converter providing 8.5 dB of gain, 9.5 dB NF, and a very high input linearity by means of its passive mixer.

Embedding two wide band auto calibrating VCOs and an integer-N synthesizer, the STW82101B is suitable for both Rx and Tx requirements for Cellular infrastructure equipment.

The integrated RF balun and internal matching permit direct 50 ohm single-ended interface to RF port. The IF output is suitable for driving 200-ohm impedance filters.

By embedding a DAC with dual current output to drive an external PIN diode attenuator, the STW82101B replaces several costly discrete components and offers a significant footprint reduction.

The STW82101B device is designed with STMicroelectronics advanced 0.35 μm SiGe process. Its performance is specified over a -40 °C to +85 °C temperature range.

Key Features

• High linearity:
  • IIP3: +24.5 dBm
  • 2FRF-2FLO spurious rejection: 75 dBc
• Noise figure:
  • NF: 9.5 dB
• Conversion gain
  • CG: 8.5 dB
• RF range: 695 MHz to 960 MHz
• Wide IF amplifier frequency range: 70 MHz to 400 MHz
• Integrated RF balun with internal matching
• Dual differential integrated VCOs with automatic center frequency calibration:
  • LOA: 850 to 1025 MHz
  • LOB: 1025 to 1185 MHz
• Embedded integer-N synthesizer
  • Dual modulus programmable prescaler (16/17 or 19/20)
  • Programmable reference frequency divider (10 bits)
  • Adjustable charge pump current
  • Digital lock detector
  • Excellent integrated phase noise
  • Fast lock time: 150 μs
• Integrated DAC with dual current output
• Supply: 3.3 V and 5 V analog, 3.3 V digital
• Dual digital bus interface: SPI and I2 C bus (fast mode) with 3 bit programmable address (1101A2 A1 A0 )
• Process: 0.35 μm BICMOS SiGe
• Operating temperature range -40 to +85o C
• 44-lead exposed pad VFQFPN package 7x7x1.0 mm
• Applications
  • Cellular infrastructure equipment:
    • IF sampling receivers
    • Digital PA linearization loops
  • Other wireless communication systems.

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