SI4122-D-GTR - 1.5 GHz RF Synthesizer | Skyworks Solutions
MPN： SI4122-D-GTR ✓ 啟用中SI4122-D-GTR 概覽
A frequency synthesizer is a clock-and-timing IC that combines a phase-locked loop, voltage-controlled oscillator, reference divider, programmable counters, and control logic to produce an output frequency locked to an external reference. Within the product hierarchy, the SI4122-D-GTR is a PLL frequency synthesizer, clock generator, RF synthesizer, and clock-and-timing semiconductor. Its integrated VCO architecture reduces the need for external oscillators, varactors, resonators, and discrete loop-filter components.
Key verified characteristics include a 1.5 GHz maximum frequency, one synthesizer circuit, a clock input, a clock output, a non-differential input and output configuration, and programmable power-down modes. The SI4122-D-GTR also offers low phase noise and a standby current of 1 µA. These characteristics make the device relevant to wireless communications equipment in which compact synthesizer implementation and reduced external-component count are important design objectives.
Technically, the device is identified as an RF synthesizer with RF2 and IF outputs rather than a general-purpose clock generator. Its PLL-based architecture is intended to support precise frequency generation from a stable reference source. The verified snippets describe an input-to-output ratio of 1:2, but detailed operating bands, reference-frequency limits, tuning resolution, phase-noise curves, loop-filter settings, supply-voltage limits, and lock-time limits are not present in the supplied data and therefore should not be inferred.
Typical uses include RF front-end local oscillators, dual-band wireless transceivers, intermediate-frequency generation, and compact radio equipment. The SI4122-D-GTR is particularly suitable when integrating an RF2/IF synthesizer into a 24-pin TSSOP design is preferable to implementing a discrete VCO and PLL arrangement. Its integrated VCOs can reduce board area and assembly effort while preserving programmable synthesis across the intended RF operating ranges.
A key design consideration is that synthesizer performance depends on the reference signal, loop-filter components, supply decoupling, layout symmetry, and the intended output frequency. Engineers should follow the manufacturer datasheet and reference circuitry for component values, grounding, RF routing, and lock-detection implementation. The exact pin assignments are not included in the verified web data, so this page does not publish an unverified pinout or recommend substitutions without schematic-level review.
This page consolidates verified distributor specifications, package information, same-package family candidates, and practical selection guidance. It also separates verified facts from unavailable electrical details, helping engineers identify the SI4122-D-GTR quickly while avoiding unsupported assumptions about pricing, compliance, pin assignments, or drop-in interchangeability.
直接替換替代品，適用於 SI4122-D-GTR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SI4122-D-GTR （相同外形與佔位） — 差異在於 Package, Product Type, Architecture, Device Type, Package Width.
SI4122-D-GT
✅ 直接替換聯絡詢價
查看資料表 →SI4123-D-GTR
✅ 直接替換聯絡詢價
查看資料表 →SI4136-F-GTR
✅ 直接替換聯絡詢價
查看資料表 →SI4112-D-GTR
✅ 直接替換聯絡詢價
查看資料表 →SI4113-D-GTR
✅ 直接替換聯絡詢價
查看資料表 →SI4122-D-GTR 規格
| Product Type | RF frequency synthesizer IC |
| Maximum Frequency | 1.5 GHz |
| Number of Circuits | 1 |
| Input Type | Clock |
| 輸出類型 | Clock |
| Input-to-Output Ratio | 1:2 |
| Differential Input | No |
| Differential Output | No |
| PLL | Yes |
| 輸出配置 | RF2/IF |
| Standby Current | 1 µA |
| Power-Down | Programmable modes |
| Integrated Components | VCOs, loop filters, varactors, and resonators |
| Minimum External Component Count | 2 components |
| Phase Noise | Low phase noise |
| 封裝 | 24-pin TSSOP, 0.173 inch (4.40 mm) width |
| 安裝類型 | Surface mount |
SI4122-D-GTR 24-pin tssop, 0.173 inch (4.40 mm) width 腳位配置指南
SI4122-D-GTR（24-pin tssop, 0.173 inch (4.40 mm) width 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SI4122-D-GTR.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI4122-D-GTR 適用於 6 應用s: Dual-Band Wireless Transceiver, RF Local Oscillator Generation, Intermediate-Frequency Signal Generation, Compact Radio and Modem Equipment, Test and Measurement Signal Source, Industrial Wireless Data Links.
Dual-Band Wireless Transceiver
The SI4122-D-GTR fits a dual-band wireless transceiver because it is identified as a dual-band RF synthesizer with RF2 and IF outputs and a maximum frequency of 1.5 GHz. Integrated VCOs reduce the external oscillator and varactor content normally associated with an RF synthesizer, while the verified minimum external-component count of two supports compact layouts. Engineers should use the manufacturer reference design to establish the loop-filter values, reference routing, and decoupling arrangement. The key benefit is board-area and assembly reduction without abandoning programmable PLL frequency generation. The design trade-off is that loop bandwidth, lock behavior, and phase-noise performance must be selected for the actual reference frequency and channel plan rather than inferred from the maximum operating frequency.
推薦
RF Local Oscillator Generation
The SI4122-D-GTR is suitable for generating a programmable RF local oscillator in wireless front ends because it combines a PLL, integrated VCOs, and RF2/IF outputs in one 24-pin TSSOP device. Its maximum verified operating frequency of 1.5 GHz covers the stated capability of the part, while integrated VCOs eliminate the need for separate external VCO and varactor assemblies. Place the reference input and feedback paths using the manufacturer's recommended topology, and route the RF output over a controlled impedance structure with short return paths. The measurable implementation advantage is the reduction in external RF components. The principal engineering constraint is verifying that the required LO frequency, reference ratio, tuning word, and output power all fall within the datasheet limits for the selected device revision.
推薦
Intermediate-Frequency Signal Generation
The SI4122-D-GTR can support IF signal generation because Mouser and Skyworks descriptions identify an RF2/IF output architecture, and DigiKey classifies the device as a clock output frequency synthesizer. A programmable IF allows transmit and receive chains to derive coherent signals from a shared reference. The integrated synthesizer reduces discrete PLL hardware, while its 1 µA standby-current specification supports power-sensitive operating states when the programmable power-down modes are used correctly. Engineers should validate the IF frequency range, output drive, channel spacing, and settling time against the exact datasheet. A clean reference and controlled supply rails are essential because reference phase noise and supply ripple can propagate into the synthesized IF signal even when the synthesizer itself has low phase noise.
推薦
Compact Radio and Modem Equipment
The SI4122-D-GTR suits compact radio and modem equipment where a dedicated RF synthesizer would otherwise require a PLL, external VCO, varactor, resonator, and associated routing. Its integrated VCOs and minimum external-component count of two help reduce physical size and assembly effort, while the 24-pin TSSOP provides a surface-mount package compatible with automated production. The part's programmable power-down modes can conserve energy in portable radio equipment, and the verified 1 µA standby current provides a concrete low-power figure. The design must still provide stable reference coupling, clean supply bypassing, and a layout that controls loop stability and RF coupling. Selection should be based on the required bands and reference ratio, not merely the 1.5 GHz maximum frequency.
推薦
Test and Measurement Signal Source
The SI4122-D-GTR can be evaluated for compact test and measurement signal sources because it provides programmable frequency synthesis with RF2 and IF outputs up to the verified 1.5 GHz maximum. The integrated VCO architecture allows a test module to avoid the component count of a discrete RF PLL. A laboratory instrument designer would use an accurate external reference, calibrated output path, and manufacturer-recommended loop-filter values to obtain repeatable results. The low phase-noise characteristic is relevant when synthesizing coherent test tones, although exact phase-noise figures and spur levels are absent from the verified data and must be checked for each output frequency. Power-down control can isolate the synthesizer when it is not needed, while the 1 µA standby specification indicates low leakage during that state.
推薦
Industrial Wireless Data Links
The SI4122-D-GTR is applicable to industrial wireless data links that require coherent RF and IF frequencies from a common reference. Its dual-band synthesizer description and integrated VCOs support a compact radio implementation, while programmable power-down modes help manage power in duty-cycled telemetry equipment. The 24-pin TSSOP package can simplify board assembly, and the minimum two-external-component requirement can reduce passive-component count in space-constrained sensor gateways. Industrial use nevertheless requires verification of operating temperature, supply range, frequency stability, and regulatory-relevant spurious performance, because those details are not present in the supplied snippets. Reference routing should remain short and isolated from RF output paths, and the PLL loop components should follow the manufacturer's characterized values to avoid unintended bandwidth or stability issues.
推薦
推薦產品摘要
工程參考資料，適用於 SI4122-D-GTR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SI4122-D-GT | SI4123-D-GTR | SI4136-F-GTR | SI4112-D-GTR | SI4113-D-GTR |
|---|---|---|---|---|---|---|
| Package | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP | 24-TSSOP |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Device Type | Dual-band RF synthesizer | RF synthesizer with RF2/IF output | RF synthesizer with RF1/IF output | Dual-band RF synthesizer | Frequency synthesizer | RF1/RF2 synthesizer |
主要差異化特點
- Verified RF2/IF output positioning (對比SI4123-D-GTR)
- Documented maximum operating frequency (對比SI4122-D-GT)
- Low-power standby specification (對比SI4112-D-GTR)
設計說明
Implement the SI4122-D-GTR reference, supply, and RF paths using the manufacturer reference layout. The verified data confirms that the device contains integrated VCOs, loop filters, varactors, and resonators and requires a minimum of two external components, but it does not provide those values. Place the characterized loop-filter network and decoupling capacitors at their datasheet-specified locations, and keep the reference path away from the RF2 and IF outputs to reduce coupling and phase-noise degradation.
Preserve short return paths for all 24 TSSOP connections and use a continuous ground plane beneath and around the device unless the manufacturer reference design specifies otherwise. Route the RF2 output as a controlled-impedance transmission line when board conditions require it. The GTR suffix identifies a tape-and-reel ordering option, but it does not remove the need for careful package placement; follow the land pattern and orientation shown in the official package drawing rather than deriving it from a generic TSSOP footprint.
Do not select a similarly named Si41xx device solely because it also uses a 24-pin TSSOP package. The verified family comparison shows SI4123-D-GTR with RF1/IF output and SI4113-D-GTR with RF1/RF2 output, while the target uses RF2/IF output. Before a substitution, compare the complete pinout, reference-frequency limits, tuning resolution, supply range, programming interface, lock behavior, and output drive. A shared package is a starting point for review, not proof of interchangeability.
合規資訊
The supplied verified web data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred from distributor availability.
