STMicroelectronics STW82100B

Overview

STW82100B from STMicroelectronics is an RF down converter with an embedded integer-N synthesizer designed for cellular infrastructure receivers, IF sampling receiver architectures, digital PA linearization loops, and wireless communication signal-chain equipment. The device integrates a passive mixer, IF amplifier, RF balun, dual differential VCOs, integer-N PLL synthesizer, SPI / I²C digital control, and dual DAC current outputs for external PIN diode attenuator control.

For engineers reviewing the STW82100B datasheet, STW82100B pinout, STW82100B application, or STW82100B equivalent, this RF IC is most relevant for 1620 MHz to 2400 MHz down-conversion systems requiring 8 dB conversion gain, 10.5 dB noise figure, +25.5 dBm IIP3, 70 MHz to 400 MHz IF amplifier coverage, integrated LO generation, and 44-lead exposed-pad VFQFPN assembly.

Technical Context

STW82100B combines a high-linearity passive mixer and integrated RF balun to support a 50 Ω single-ended RF input over the 1620 MHz to 2400 MHz range. The IF amplifier covers 70 MHz to 400 MHz and is intended for 200 Ω IF filter interfaces, giving infrastructure receiver designs an integrated RF-to-IF conversion block with 8 dB conversion gain and 77 dBc 2FRF-2FLO spurious rejection.

The integrated synthesizer uses dual differential VCOs with automatic center-frequency calibration, covering LOA from 1650 MHz to 1950 MHz and LOB from 2050 MHz to 2370 MHz. The integer-N PLL includes a 16/17 or 19/20 programmable prescaler, 10-bit reference divider, adjustable charge-pump current, digital lock detector, and 150 µs fast lock time, with register programming through SPI or fast-mode I²C.

Key Specifications

Pinout & Package

STW82100B is supplied in a 44-lead exposed-pad VFQFPN package measuring 7 mm × 7 mm × 1.0 mm. The exposed-pad QFN format supports compact RF placement, low-inductance grounding, controlled RF return paths, and efficient board-level thermal transfer, which are important when routing the RF input, IF outputs, PLL loop filter, VCO control nodes, digital interface, DAC outputs, and multiple supply domains on cellular infrastructure RF boards.

Key Features

• Integrated RF down converter with passive mixer, IF amplifier, RF balun, integer-N synthesizer, and dual VCOs.
• 1620 MHz to 2400 MHz RF input range for high-band cellular infrastructure and wireless receiver applications.
• 8 dB conversion gain, 10.5 dB noise figure, and +25.5 dBm IIP3 for high-linearity RF-to-IF conversion.
• 70 MHz to 400 MHz IF amplifier frequency range for IF sampling receiver architectures.
• Dual integrated VCO ranges with automatic center-frequency calibration and 150 µs synthesizer lock time.
• SPI and fast-mode I²C programming interface plus integrated dual-current DAC for external PIN diode attenuator control.

Applications

Equivalent & Alternatives

When evaluating STW82100B equivalent devices, engineers should compare RF input frequency range, LO/VCO coverage, conversion gain, noise figure, IIP3, IF amplifier frequency range, synthesizer interface, DAC attenuator-drive requirement, VFQFPN-44 footprint, and production packaging format.

Compared with STW82100BTR, STW82100B keeps the same RF down-conversion function, PLL architecture, package, pinout, and electrical operating role, with the main selection difference being tray versus tape-and-reel logistics. STW82100B vs STW82101B, STW82102B, or STW82103B selection depends on RF band coverage, LO planning, IF frequency target, spur rejection needs, and assembly packaging requirements.

Quality

STW82100B should be sourced as original STMicroelectronics components through traceable and controlled supply channels. Quality verification procedures may include VFQFPN-44 package inspection, top-mark validation, tray and label verification, solderability testing, RF input continuity review, IF output function verification, SPI / I²C programming checks, PLL lock-detect testing, conversion-gain screening, and incoming inspection according to RF infrastructure equipment production requirements.

Availability

STW82100B is available at Aetrix Electronics and suitable for cellular infrastructure receivers, IF sampling receiver platforms, digital PA linearization loops, and wireless RF down-conversion modules requiring stable component supply and repeatable production support.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for OEM manufacturers, RF module builders, base-station equipment developers, wireless communication system designers, and electronics production programs.

For production deployment, confirming the VFQFPN-44 package, 1620 MHz to 2400 MHz RF range, IF frequency plan, SPI or I²C control mode, analog and digital supply rails, tray packaging, environmental specifications, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

STMicroelectronics supplies RF, mixed-signal, power, embedded, and discrete semiconductor products for wireless infrastructure, industrial, automotive, consumer, and communication systems. STW82100B belongs to the STW8210xB RF down-converter family, which combines frequency synthesis, VCO generation, RF mixing, IF amplification, and digital configurability for compact high-performance RF signal-chain designs.

FAQ

What is STW82100B used for?

STW82100B is used for RF down-conversion in cellular infrastructure equipment, IF sampling receivers, digital PA linearization loops, and wireless communication systems. It translates RF signals from the 1620 MHz to 2400 MHz range into a 70 MHz to 400 MHz IF range using an integrated mixer, IF amplifier, and synthesizer.

What RF and IF ranges does STW82100B support?

STW82100B supports an RF input range from 1620 MHz to 2400 MHz and an IF amplifier range from 70 MHz to 400 MHz. The integrated VCO ranges are LOA from 1650 MHz to 1950 MHz and LOB from 2050 MHz to 2370 MHz, matching the STW82100B high-band frequency plan.

Does STW82100B include an RF synthesizer?

Yes. STW82100B includes an embedded integer-N synthesizer with dual integrated VCOs, automatic center-frequency calibration, programmable prescaler, 10-bit reference divider, adjustable charge-pump current, digital lock detector, and 150 µs fast lock time. This integration reduces the need for a separate PLL and VCO section in many RF boards.

Which digital interfaces are available on STW82100B?

STW82100B supports both SPI and fast-mode I²C bus control. The I²C address uses three programmable address pins in the 1101A2A1A0 format, while the SPI interface uses data, clock, and load control pins for register programming.

What package is used by STW82100B?

STW82100B uses a 44-lead exposed-pad VFQFPN package measuring 7 mm × 7 mm × 1.0 mm. The exposed pad provides the RF ground and thermal path, while the 44-lead layout separates RF input, IF output, PLL, VCO, DAC, digital bus, and supply-domain connections.

What are common STW82100B equivalent options?

Common comparison options include STW82100BTR for the same circuit function in tape-and-reel packaging, STW82101B for 695 MHz to 960 MHz RF coverage, STW82102B for 1425 MHz to 1910 MHz coverage, and STW82103B for 2300 MHz to 2700 MHz coverage. Selection depends on RF band plan, LO range, IF target, package format, and production packaging.