SI4112-D-GT - 1 GHz Dual-Band RF Synthesizer | Skyworks
MPN： SI4112-D-GT ✗ 停產SI4112-D-GT 概覽
A frequency synthesizer is a phase-locked-loop timing and RF component that locks a voltage-controlled oscillator to a stable reference frequency. The SI4112 family integrates the VCO circuitry and associated RF functions, reducing the need for external VCOs, varactor diodes, and passive networks. The manufacturer specifically identifies dual-band and IF synthesis as useful functions for wireless personal-communications equipment.
The verified product data establishes a maximum listed frequency of 1 GHz and a single output channel. It also identifies a 24-TSSOP surface-mount package with a 0.173-inch body width and 4.40 mm overall width. Skyworks states that the integration can reduce external passive-component count, eliminate external VCOs and varactor diodes, and improve power efficiency compared with less-integrated implementations.
This device belongs to the RF synthesizer hierarchy: RF frequency synthesizer → PLL → clock and timing IC → integrated circuit. Its integrated VCO architecture makes it relevant to compact wireless receivers and transmitters where board area, external component count, and power efficiency are important. The provided sources describe the part for wireless personal communications rather than high-end test equipment or precision instrumentation.
Typical uses include RF down-conversion and up-conversion systems, wireless communication transceivers, and compact RF signal chains requiring programmable frequency generation. The IF output allows the synthesized signal to be used as an intermediate-frequency source in a receiver or transmitter architecture. The available verified data does not establish exact operating voltage, tuning range, phase-noise values, output power, temperature limits, or pin-level electrical limits.
Designers should verify the complete manufacturer datasheet before layout or RF matching. The 24-pin TSSOP footprint requires careful high-frequency routing, controlled ground return paths, and decoupling close to the device pins. Because this is a frequency-sensitive RF component, component tolerances, reference-frequency stability, loop-filter implementation, and output matching can materially affect system performance.
This page consolidates verified distributor identity, package information, manufacturer application context, pricing fields marked as data-needed, and replacement-search limitations for SI4112-D-GT. It does not invent undocumented electrical ratings or treat generic cross-reference search results as verified drop-in equivalents.
直接替換替代品，適用於 SI4112-D-GT — 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： SI4112-D-GT （相同外形與佔位） — 差異在於 External VCO Requirement, Package.
SI4112-D-GM
✅ 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 →SI4112-D-GT 規格
| Device Type | Dual-band RF frequency synthesizer IC |
| Maximum Listed Frequency | 1 GHz |
| Output Channel Count | 1 |
| Architecture | PLL RF synthesizer with integrated VCOs |
| Output Function | IF output |
| 封裝 | 24-TSSOP |
| Package Width | 0.173 inch |
| Overall Package Width | 4.40 mm |
| 安裝類型 | Surface mount |
| Nominal Frequency-Synthesis Band Count | Dual-band |
| Wireless Communications Use | Personal wireless communications applications |
| Integrated VCO | Yes |
| External VCO Requirement | Eliminated by integrated VCO architecture |
| External Varactor Requirement | Eliminated by integrated VCO architecture |
SI4112-D-GT 4.40 mm 腳位配置指南
SI4112-D-GT（4.40 mm 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： SI4112-D-GT.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI4112-D-GT 適用於 7 應用s: Wireless RF Transceiver, RF Down-Conversion Receiver, Wireless Transmitter, Intermediate-Frequency Signal Generation, Compact Wireless Communication Module, RF Signal-Source Subsystem, Wireless Communication Test Fixture.
Wireless RF Transceiver
The SI4112-D-GT fits wireless RF transceivers that need programmable frequency generation close to the RF signal chain. Its verified 1 GHz maximum listed frequency, dual-band synthesis, integrated VCOs, and IF output are useful for receiver or transmitter architectures requiring a compact local frequency source. The integration can reduce the number of external VCO and varactor components, but the design must still validate phase noise, tuning range, output level, matching, and reference-clock performance against the complete manufacturer datasheet.
推薦
RF Down-Conversion Receiver
In an RF down-conversion receiver, the SI4112-D-GT can generate a programmable local oscillator or IF-related signal for frequency translation. The verified IF output and dual-band synthesizer description make it relevant to compact wireless receiver designs. Engineers should confirm whether the selected synthesis band covers the required LO frequencies and verify reference sensitivity and phase noise, because those values are not provided in the verified snippets and directly determine receiver image and noise performance.
推薦
Wireless Transmitter
The SI4112-D-GT can serve as a compact RF source in wireless transmitter circuitry where a dual-band synthesizer and integrated VCO reduce external RF component count. The verified manufacturer description emphasizes price-sensitive, low-power personal-wireless use and elimination of external VCOs and varactor diodes. Before selecting it for a transmitter, verify output power, tuning accuracy, spur performance, supply range, and thermal behavior because these electrical limits are not supplied in the available records.
推薦
Intermediate-Frequency Signal Generation
The verified IF-output feature makes the SI4112-D-GT relevant to systems that need a controlled intermediate-frequency source. In a receiver or transmitter, this signal can support frequency conversion, channel-specific modulation, or test-oriented signal generation. The component should be placed with careful reference routing, RF grounding, impedance control, and output matching. Exact IF frequency range and output-level data must be obtained from the manufacturer datasheet before fixing the surrounding filter and amplifier network.
推薦
Compact Wireless Communication Module
The SI4112-D-GT is well aligned with compact wireless modules that prioritize board area and low external-component count. Its integrated VCO architecture can eliminate separate VCO and varactor assemblies, while the 24-TSSOP package supports surface-mount assembly. In a module design, verify the reference-clock source, loop-filter components, supply decoupling, RF output matching, and thermal path. The supplied sources support the use case but do not provide enough data to guarantee regulatory or operating-temperature compliance.
推薦
RF Signal-Source Subsystem
The SI4112-D-GT can provide the programmable RF source used in a larger signal-generation or conversion subsystem. Its dual-band operation, integrated VCOs, and IF output support frequency-agile RF architectures, while the compact TSSOP package can reduce PCB footprint compared with a discrete VCO implementation. The subsystem designer must account for reference jitter, loop bandwidth, output buffering, filtering, matching, and isolation between sensitive RF stages; those design values are not specified in the supplied search data.
推薦
Wireless Communication Test Fixture
A wireless communication test fixture can use the SI4112-D-GT as an RF frequency source when the test system needs compact programmable synthesis. The verified 1 GHz maximum listed frequency and IF output provide a useful starting point for fixture architecture, but a production test design requires confirmed tuning range, frequency accuracy, phase noise, output power, and calibration behavior. Use controlled reference routing and shielded RF layout to prevent unintended radiation and to make measurements repeatable across multiple units.
推薦
推薦產品摘要
工程參考資料，適用於 SI4112-D-GT — 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 | SI4112-D-GM | SI4112-D-GTR |
|---|---|---|---|
| Package | 24-TSSOP | TSSOP-24 | TSSOP-24 |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
主要差異化特點
- Integrated dual-band RF synthesizer architecture (對比SI4112-D-GM)
- Wireless personal-communications positioning (對比SI4112-D-GTR)
- Reduced external RF component count (對比Generic discrete-VCO PLL implementation)
設計說明
Keep the reference-clock and RF output paths short, with a continuous ground reference and minimal discontinuities. A frequency synthesizer can amplify reference and routing noise into phase and frequency errors, so use the manufacturer’s recommended reference and decoupling arrangements rather than general-purpose digital-layout assumptions.
Place input and output decoupling components close to the SI4112-D-GT pins and preserve the 24-TSSOP land pattern exactly as defined by the manufacturer package drawing. The verified data confirms the TSSOP-24 package but not individual pin names, so PCB release must wait for the official pinout and footprint verification.
Do not treat a related SI4112 suffix as a drop-in replacement without checking frequency range, electrical limits, reference interface, loop-filter requirements, and pin assignments. The supplied cross-reference results identify SI4112-D-GM and SI4112-D-GTR as related search candidates, but they do not establish full substitution equivalence.
Calculate dissipation from the actual supply voltage, output condition, and RF operating mode before selecting copper area or thermal relief. The verified records do not provide power dissipation, junction temperature, or thermal-resistance data, so a numerical thermal estimate would be speculative and should be avoided until those values are obtained from the manufacturer datasheet.
合規資訊
The supplied verified data identifies Skyworks Solutions and describes the device as an RF synthesizer for wireless communications, but it does not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements.
