STW81100AT-1 - 4.4GHz RF Synthesizer | STMicroelectronics
料号： STW81100AT-1 ✓ 量产中STW81100AT-1 概述
A frequency synthesizer is a clock-and-timing IC that uses a phase-locked loop to generate a stable output frequency from a reference source. A PLL compares a divided feedback signal with the reference, while an integrated voltage-controlled oscillator supplies the output. This STW81100AT-1 device combines an integer-N PLL architecture, dual differential integrated VCOs, and automatic center-frequency calibration in one RF-oriented package.
The principal feature is multi-band operation from integrated VCO cores. The manufacturer datasheet identifies direct output at 3900 MHz to 4400 MHz and an internal divider by two with output at 2200 MHz. Automatic center-frequency calibration supports startup across different operating states, while the integer-N architecture simplifies frequency planning. A maximum frequency of 4.4 GHz makes the part applicable to microwave and wireless RF signal chains operating below that limit.
The 28-VFQFN exposed-pad package is designed for compact RF layouts and provides a central thermal and ground connection. Its RF performance depends on clean supplies, controlled reference routing, short interconnects, and appropriate impedance-controlled layouts. The datasheet indicates that the exposed pad must be connected to ground, while the remaining manufacturing, loop-filter, and RF-layout details should follow the exact pin arrangement and reference circuit in the manufacturer documentation.
Typical uses include RF transceiver clock generation, wireless base-station and infrastructure equipment, microwave communication links, test-and-measurement instruments, and frequency-generation modules. It is most appropriate when an integrated synthesizer reduces board area compared with a discrete oscillator and divider arrangement. It should not be selected solely by its 4.4 GHz headline value; reference frequency, tuning range, channel spacing, output power, phase noise, temperature range, and system loop-filter requirements must also be checked.
Designers should verify every pin against the 28-pin VFQFN layout before layout release and use the manufacturer's reference circuit as the starting point. RF and supply connections need short return paths, carefully controlled impedance, and isolation from noisy switching stages. Loop-filter component values determine lock behavior and phase noise, so they should not be copied between different reference or output-frequency plans without recalculation.
This page consolidates distributor availability, package information, verified frequency and architecture details, engineering application guidance, and procurement-oriented comparisons. It distinguishes documented facts from unavailable information rather than estimating supply voltage, output power, phase noise, temperature limits, pricing, or a complete pin assignment that was not present in the supplied web results.
直接替换替代料： STW81100AT-1 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料STW81100AT-1 规格参数
| Device Type | Multi-band RF frequency synthesizer with integrated VCOs |
| PLL Architecture | Integer-N |
| Maximum Indicated Frequency | 4.4 GHz |
| Direct Output Frequency | 3900 MHz to 4400 MHz |
| Divided Output Frequency | 2200 MHz |
| Integrated Oscillator Count | 2 differential integrated VCOs |
| VCO Calibration | Automatic center-frequency calibration |
| Channel Count | 1 |
| Device Classification | Phase-locked loops and RF frequency synthesizer |
| 封装 | 28-pin VFQFN with exposed pad |
| 安装类型 | Surface mount |
STW81100AT-1 28-pin vfqfn with exposed pad 引脚配置指南
STW81100AT-1（28-pin vfqfn with exposed pad 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： STW81100AT-1.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STW81100AT-1 适用于 6 应用s: Wireless RF Transceiver Clock Generation, Microwave Communication Link Synthesis, RF Test and Measurement Instrumentation, Wireless Infrastructure Equipment, RF Signal Source Modules, Multi-Band RF Communication Front Ends.
Wireless RF Transceiver Clock Generation
The STW81100AT-1 fits wireless RF transceivers requiring a local synthesis source for carrier or clock generation within the 3900 MHz to 4400 MHz direct-output range. Its integrated dual differential VCOs and automatic center-frequency calibration reduce the number of separate RF oscillator components on the board. The 2200 MHz divided output may also support lower-frequency clock plans where the resulting divider configuration is acceptable. Because the architecture is integer-N, engineers must verify whether the reference and supported channel spacing provide the required frequency resolution.
推荐
Microwave Communication Link Synthesis
The STW81100AT-1 is applicable to compact microwave links that need an on-board frequency source near the transmit or receive RF section. Its documented direct output reaches 4400 MHz, allowing operation near the top of the 3900 MHz to 4400 MHz range, while the divide-by-two path provides a 2200 MHz output. Using a dedicated synthesizer can centralize channel selection and simplify RF distribution, but the board designer must account for loop-filter design, reference jitter, output buffering, and controlled-impedance connections.
推荐
RF Test and Measurement Instrumentation
The STW81100AT-1 can serve as the synthesis element in RF test equipment that must generate controlled carrier frequencies. The 2200 MHz output and 3900 MHz to 4400 MHz direct range provide several documented operating points for instrumentation or subassembly evaluation. Its integrated VCOs and automatic center-frequency calibration may simplify repeatable laboratory setup, while the integer-N structure requires careful reference planning. Signal-chain calibration, reference isolation, and output-power characterization remain system-level responsibilities.
推荐
Wireless Infrastructure Equipment
The STW81100AT-1 is suitable for evaluation in wireless infrastructure modules whose RF sections operate around 2200 MHz or within the 3900 MHz to 4400 MHz band. Integrating the PLL and VCO functions into a 28-pin VFQFN exposed-pad package supports compact RF assemblies and reduces the number of separately interconnected frequency-generation parts. In infrastructure equipment, thermal design and power-supply cleanliness are especially important because switching regulators and high-power stages can degrade synthesizer phase noise if their return currents are allowed to share sensitive paths.
推荐
RF Signal Source Modules
The STW81100AT-1 can be used in modular RF signal-source designs that require a compact, self-contained synthesis function. Its direct range of 3900 MHz to 4400 MHz and integrated 2200 MHz divided output allow a module to cover multiple test tones or local-oscillator frequencies from one device. Automatic center-frequency calibration supports repeatable selection of the operating VCO range. A production module should still validate lock time, reference accuracy, phase noise, spur performance, and output level across its complete temperature range.
推荐
Multi-Band RF Communication Front Ends
The STW81100AT-1 fits multi-band RF front ends that require local frequency generation near sensitive receiver or transmitter circuits. The manufacturer describes automatic center-frequency calibration and dual differential integrated VCOs, features that support multi-band operation without external oscillator packages. The 2200 MHz divided path can serve lower-frequency internal references or carrier plans, while the direct path supports 3900 MHz to 4400 MHz RF bands. Placement near the RF connector, careful reference routing, and separate noisy and quiet supply paths are critical to preserving performance.
推荐
推荐产品汇总
工程参考数据： STW81100AT-1 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 |
|---|---|
| Brand | STMicroelectronics |
| Package | 28-pin VFQFN with exposed pad |
| Device Type | Multi-band RF frequency synthesizer with integrated VCOs |
| PLL Architecture | Integer-N |
| Maximum Indicated Frequency | 4.4 GHz |
| Direct Output Frequency | 3900 MHz to 4400 MHz |
| Divided Output Frequency | 2200 MHz |
| Integrated Oscillator Count | 2 differential integrated VCOs |
| Channel Count | 1 |
| VCO Calibration | Automatic center-frequency calibration |
关键差异点
- Integrated multi-band RF synthesis （对比 Discrete VCO and divider implementation)
- Documented high-frequency direct output （对比 Discrete oscillator limited to a single band)
- Automatic VCO center-frequency calibration （对比 Manually tuned discrete oscillator network)
设计说明
Begin the layout with the manufacturer reference circuit and pin table for the 28-pin VFQFN exposed-pad package. Keep RF outputs, reference connections, and decoupling paths short, provide a continuous ground reference, and connect the exposed pad as instructed. The verified results do not provide stack-up, trace-width, or pad-coupling guidance, so those details must be obtained from the full datasheet and reference design rather than inferred from the package name.
Separate the synthesizer's supply network from noisy switching-converter paths and use the decoupling arrangement recommended by STMicroelectronics. Estimated: no power-consumption value is calculated because the supplied data does not state supply voltage or operating current. Verify the actual regulator dissipation and junction-temperature margin from the complete datasheet once those limits are available, particularly when the device is mounted in a densely populated RF module.
Treat the reference clock and RF outputs as sensitive high-frequency signals: use short traces, continuous return planes, controlled impedance, and isolation from switching nodes. Integer-N synthesis does not remove the contribution of reference phase noise, and passive or active filtering cannot create margin that is absent in the reference path. Check lock behavior, spurs, and output purity on the assembled board rather than relying only on isolated-device measurements.
Do not treat 4.4 GHz as proof that the device can synthesize every frequency below that limit. Confirm the allowed reference frequency, integer division ratios, channel spacing, and whether the required output uses the direct VCO path or the 2200 MHz divided path. Also do not substitute a similarly named STMicroelectronics PLL without verifying the complete 28-pin assignment and electrical requirements.
合规信息
The supplied verified snippets do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals compliance. AEC-Q100 is marked not applicable because the supplied data does not identify the part as an automotive-qualified device.
