STW81101AT - 4.4GHz RF Frequency Synthesizer | STMicroelectronics
Артикул: STW81101AT ✓ АктивенSTW81101AT Обзор
A frequency synthesizer is a clock-and-timing IC that combines a phase-locked loop, voltage-controlled oscillator, and frequency dividers to generate stable, programmable output frequencies. The STW81101AT belongs to the PLL family within the broader clock-generation and timing-synchronization hierarchy, making it suitable for systems requiring controlled RF or digital clock generation rather than a fixed-frequency oscillator.
Key features include integer-N frequency synthesis, dual differential integrated VCOs, and automatic VCO center-frequency calibration. The single output supports synthesis up to 4.4 GHz, while the reference input range of 10 MHz to 200 MHz provides flexibility in system clock distribution. Its operating-temperature range is -40 °C to +85 °C, supporting industrial-grade applications where temperature stability and controlled RF frequency generation are important.
The dual differential VCO arrangement provides complementary tuning paths within one frequency-synthesizer IC. Automatic center-frequency calibration helps the synthesizer identify and lock the appropriate VCO operating range, reducing the manual calibration burden associated with discrete voltage-controlled oscillators. The integer-N architecture is intended for applications that can derive the required output through integer multiplication and division of the external reference frequency.
Typical uses include RF transceiver clock generation, processor and peripheral clocking, multi-clock systems, timing synchronization, and communication equipment. The 4.4 GHz maximum frequency is particularly relevant to RF signal-chain designs, while the integrated VCOs reduce the component count compared with discrete oscillator-and-divider solutions.
Designers should verify the output frequency plan, reference ratio, loop-filter implementation, supply decoupling, and exposed-pad thermal layout against the manufacturer datasheet before layout release. Differential RF connections should be routed with controlled impedance, and the exposed pad should be connected to the appropriate ground plane to support heat dissipation.
This page combines verified distributor specifications, a confirmed same-family drop-in ordering alternative, and practical selection guidance. It distinguishes documented electrical facts from parameters that remain unavailable in the supplied source data, helping engineers evaluate the STW81101AT without relying on unsupported assumptions.
Аналоги без доработки для STW81101AT — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с STW81101AT (тот же форм-фактор и посадочное место) — отличается по Device Type, Operating Temperature Range, Package, VCO Configuration.
STW81101ATR
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Открыть даташит →STW81101AT Характеристики
| Device Type | Integer-N multi-band RF frequency synthesizer |
| Maximum Synthesis Frequency | 4.4 GHz |
| Reference Input Frequency Range | 10 MHz to 200 MHz |
| Output Count | 1 output |
| VCO Configuration | Dual differential integrated VCOs with automatic center-frequency calibration |
| Architecture | Integer-N PLL frequency synthesizer |
| Корпус | 28-pin VFQFPN with exposed pad |
| Package Code | HVQCCN |
| Terminal Count | 28 terminals |
| Диапазон рабочих температур | -40 °C to +85 °C |
| Тип монтажа | Surface mount |
| Packaging | Tray |
Руководство по цоколевке STW81101AT в корпусе hvqccn
Цоколевка для STW81101AT (корпус hvqccn). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для STW81101AT.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
STW81101AT подходит для 6 применениеs: RF Transceiver Clock Generation, Multi-Clock System Timing, Processor and Peripheral Clocking, RF Communication Equipment, Industrial Timing Synchronization, Instrumentation and Test Equipment.
RF Transceiver Clock Generation
The STW81101AT fits RF transceiver designs that require a programmable local oscillator or reference-derived clock up to 4.4 GHz. Its integer-N PLL architecture generates the requested frequency from an external 10 MHz to 200 MHz reference, while dual differential integrated VCOs with automatic center-frequency calibration provide two tuning resources within one synthesizer. In an RF signal chain, this integration can reduce the need for discrete VCO, divider, and calibration circuitry. The engineering trade-off is that channel spacing, reference ratio, tuning range, and loop-filter values must remain compatible with integer-N operation, and the complete datasheet must be consulted for phase-noise and output-drive details unavailable in the verified distributor records.
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Multi-Clock System Timing
The STW81101AT can provide a controlled, programmable clock where a multi-clock system needs more flexibility than a fixed crystal oscillator. Its reference input accepts 10 MHz to 200 MHz, and its synthesizer output reaches 4.4 GHz according to the verified DigiKey record, allowing system designers to derive a local clock from an existing reference distribution. Integrating the VCOs and integer-N PLL on one IC may simplify frequency planning compared with a discrete oscillator and divider chain. Designers must still verify output amplitude, jitter, duty-cycle behavior, supply requirements, and output-routing limitations from the complete manufacturer datasheet before treating it as a general-purpose clock-tree replacement.
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Processor and Peripheral Clocking
The STW81101AT is applicable to processor, digital-logic, and peripheral clocking systems that benefit from a synthesized frequency rather than a fixed-frequency source. The 4.4 GHz maximum synthesis frequency provides substantial headroom for high-speed digital subsystems, while the 10 MHz to 200 MHz reference range can accommodate common distributed-reference arrangements. Its integer-N operation allows a designer to relate the desired output directly to the reference and integer division ratio. The principal limitation is that the output must remain within the device's complete tuning, divider, PLL, and loop-filter specifications. Timing-budget analysis and board-level signal-integrity validation remain necessary because the verified source summaries do not specify RMS jitter, output rise time, or duty-cycle limits.
Рекомендуется
RF Communication Equipment
The STW81101AT supports RF communication equipment requiring accurate frequency generation within a compact 28-pin VFQFPN package. Its maximum synthesis frequency of 4.4 GHz makes it relevant to wireless transceiver sections, while automatic center-frequency calibration for the integrated VCOs can simplify initial bring-up compared with manually tuned discrete oscillators. The integer-N topology is particularly useful when the system reference and channel plan permit integer multiplication and division. Designers should allocate loop-filter components and reference-routing area according to the manufacturer's schematic, ensure adequate exposed-pad grounding for thermal performance, and verify phase noise and spur requirements for the target modulation standard before committing to the device.
Рекомендуется
Industrial Timing Synchronization
The STW81101AT's -40 °C to +85 °C operating range and integrated frequency-synthesis functions suit industrial timing-synchronization equipment operating across extended temperature conditions. It can derive a programmable clock from a shared reference instead of requiring a separate oscillator for each frequency, which can help consolidate designs with several related clock domains. Automatic VCO center-frequency calibration may shorten configuration time after power-up. Industrial use nevertheless requires careful review of long-term stability, reference jitter, phase-noise behavior, supply tolerance, and thermal cycling because those detailed parameters were not available in the supplied distributor summaries. Prototype evaluation should use the manufacturer's recommended loop filter, decoupling network, reference interface, and package land pattern.
Рекомендуется
Instrumentation and Test Equipment
The STW81101AT can support instrumentation and test equipment that need selectable synthesized frequencies for excitation, conversion, or synchronization. Its single output reaches up to 4.4 GHz, and the external reference range of 10 MHz to 200 MHz enables integration with laboratory reference architectures. Integer-N synthesis provides a straightforward frequency relationship that can simplify control firmware, although a low division factor may constrain spur performance. Before using the device as a measurement-clock source, engineers should obtain the complete datasheet and characterize output noise, reference sensitivity, tuning linearity, and output isolation. PCB implementation should preserve controlled-impedance RF paths, clean reference routing, and a low-impedance thermal connection beneath the exposed pad.
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Сводка рекомендуемых товаров
Справочные инженерные данные для STW81101AT — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | STW81101ATR |
|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics |
| Package | 28-pin VFQFPN with exposed pad | 28-pin VFQFPN with exposed pad |
| Maximum Synthesis Frequency | 4.4 GHz | 4.4 GHz |
| Reference Input Range | 10 MHz to 200 MHz | 10 MHz to 200 MHz |
| Output Count | 1 output | 1 output |
| Architecture | Integer-N RF frequency synthesizer | Integer-N RF frequency synthesizer |
| VCO Configuration | Dual differential integrated VCOs with automatic calibration | Dual differential integrated VCOs with automatic calibration |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C |
| Ordering Format | Tray | Tape and reel |
Ключевые отличия
- Confirmed drop-in ordering alternative (против STW81101ATR)
- Single-output design with integrated VCOs (против STW81101ATR)
- Production packaging flexibility (против STW81101ATR)
Заметки по проектированию
Route the reference input and differential RF paths as short, controlled-impedance connections, and keep the loop-filter and PLL support components close to their assigned pins. The verified sources establish a 28-pin VFQFPN device with an exposed pad but do not provide the complete recommended land pattern; use the manufacturer datasheet and PCB library rather than inferring pad geometry from distributor package naming.
Connect the exposed pad to the recommended ground-plane structure and provide adequate copper area for heat removal. Exact junction-to-ambient thermal resistance is not available in the verified data, so thermal margins should be calculated using the manufacturer's package data and the actual PCB stack-up. Avoid placing thermally restrictive features beneath the device unless the approved land pattern explicitly permits them.
Do not select the device from its 4.4 GHz headline frequency alone. Confirm the complete tuning range, integer-N ratio constraints, reference-input sensitivity, phase-noise target, output characteristics, and supply limits from the manufacturer datasheet. The verified summaries identify the key architecture but omit several critical electrical limits, so substituting an assumed value can produce an invalid frequency plan or unstable PLL behavior.
Place supply bypass components at the pins specified by the manufacturer and follow the reference-circuit topology without changing component values based on generic guidance. Because supply-voltage range and current consumption are marked as unavailable, calculate the regulator's dissipation and startup margin using verified datasheet values after they are obtained. Sequence the reference and supplies as required by the recommended application circuit.
Информация о соответствии
The supplied verified web data does not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The industrial temperature rating does not itself establish AEC-Q100 qualification.
