SI4123-D-GM - Dual-Band RF Synthesizer | Skyworks
MPN: SI4123-D-GM ✗ انتهى عمره الإنتاجيSI4123-D-GM نظرة عامة
A frequency synthesizer generates a stable, programmable output signal by combining a phase-locked loop with a voltage-controlled oscillator. An RF synthesizer extends this function into the radio-frequency domain and is used to establish carrier or intermediate-frequency signals in wireless receivers, transmitters, and related communication equipment. The SI4123 family is positioned as a low-power, price-sensitive solution for personal wireless communications.
The SI4123-D-GM integrates the VCO functions, which the Skyworks product description says reduces the external passive-component count and eliminates external VCOs and varactor diodes. This integration can simplify RF board layouts and reduce assembly requirements. Its dual-band capability allows one device family to address multiple wireless frequency plans, while programmable synthesis gives system designers flexibility in setting the generated frequency.
Typical wireless communication uses include RF front-end signal generation, intermediate-frequency synthesis, and dual-band transceiver support. The 2.7 V to 3.6 V supply range is suitable for low-voltage RF systems, while the listed 18 mA to 27 mA current range should be checked against the actual operating mode and frequency plan. The exposed-pad package also requires attention to PCB thermal dissipation and layout quality.
Designers should follow the manufacturer datasheet for the complete pinout, recommended loop-filter components, reference-clock requirements, RF output matching network, and decoupling layout. The available search results identify the device as obsolete or associated with an obsolete product status in comparison pages, so lifecycle confirmation should be completed before new production sourcing. This page consolidates verified distributor results, cross-reference findings, package information, application context, and engineering cautions.
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الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع SI4123-D-GM (نفس عامل الشكل والبصمة) — يختلف في Manufacturer, Number of Circuits.
SI4123-D-GMR
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عرض ورقة البيانات ←SI4123-D-GM المواصفات
| Product Type | Dual-band RF frequency synthesizer |
| Integrated VCOs | Integrated VCOs |
| Frequency Range 1 | 900 MHz to 1800 MHz |
| Frequency Range 2 | 750 MHz to 1500 MHz |
| Supply Voltage Range | 2.7 V to 3.6 V |
| تيار التغذية | 18 mA to 27 mA |
| Output Power | -14 dBm to +1 dBm |
| Harmonic Rejection | -26 dBc to -20 dBc |
| العلبة | 28-pin VFQFN with exposed pad |
| Number of Circuits | 13 circuits |
| Application Category | Clock generators, PLLs, and frequency synthesizers |
| RF Application | Wireless personal communications |
| نوع التركيب | Surface mount |
| Manufacturer | Skyworks Solutions Inc. |
| حالة دورة الحياة | Obsolete |
دليل تكوين أطراف SI4123-D-GM 28-pin vfqfn with exposed pad
تكوين الأطراف لـ SI4123-D-GM (حزمة 28-pin vfqfn with exposed pad). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ SI4123-D-GM.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
SI4123-D-GM مناسب لـ 6 التطبيقs: Wireless Transmitter RF Signal Generation, Wireless Receiver Intermediate-Frequency Synthesis, Dual-Band Radio-Frequency Front End, Low-Voltage Wireless Communication Module, RF Test and Measurement Signal Source, Legacy Wireless Product Maintenance.
Wireless Transmitter RF Signal Generation
The SI4123-D-GM fits wireless transmitter designs that need programmable RF synthesis across the listed 750 MHz to 1500 MHz and 900 MHz to 1800 MHz ranges. Its integrated VCOs can remove external VCO and varactor assemblies, reducing the number of discrete RF components that must be assembled and tuned. Place the device with a controlled reference clock, a datasheet-approved loop filter, and an RF output matching network, then verify output power and unwanted-signal performance with the actual antenna and PA load.
موصى به
Wireless Receiver Intermediate-Frequency Synthesis
Use the SI4123-D-GM when a wireless receiver requires a stable programmable intermediate-frequency source. The dual-band synthesis capability provides flexibility for frequency plans that use different RF and IF regions, while the listed 2.7 V to 3.6 V supply range supports low-voltage receiver architectures. The RF section must be isolated from sensitive receiver paths, and the loop-filter and reference-clock components should be selected only after confirming tuning and phase-noise requirements in the manufacturer documentation.
موصى به
Dual-Band Radio-Frequency Front End
The SI4123-D-GM is suited to dual-band RF front-end subsystems where the radio must synthesize signals for more than one supported frequency region. Integration of the VCOs can simplify the front end and reduce external RF passive count, which is valuable when board area and assembly cost are constrained. The implementation should separate high-level RF routing from sensitive reference and control paths, and should be validated for channel accuracy, spurious signals, output power, and behavior across both listed bands.
موصى به
Low-Voltage Wireless Communication Module
The 2.7 V to 3.6 V operating range and listed 18 mA to 27 mA supply-current range make the SI4123-D-GM relevant to low-voltage wireless communication modules. Integration may reduce the external component count compared with a discrete VCO implementation, helping designers target compact RF hardware. Because the product is reported obsolete, new module designs should first confirm lifecycle availability and consider a qualified active alternative rather than committing solely to a legacy part.
موصى به
RF Test and Measurement Signal Source
The SI4123-D-GM can be evaluated as a programmable RF source for bench and subsystem testing where the required frequency lies within its listed bands. Its dual-band synthesis and integrated VCOs make it useful for generating repeatable local oscillator or intermediate-frequency signals during receiver and transmitter characterization. Measurement setups should account for output power variation, reference-clock stability, loop-filter behavior, package parasitics, and the need to calibrate cable and fixture losses.
موصى به
Legacy Wireless Product Maintenance
Because the SI4123-D-GM is identified as obsolete in the supplied cross-reference data, it may still be relevant to maintenance and repair of deployed wireless equipment. An identical-orderable replacement must be confirmed through manufacturer or authorized-channel records rather than inferred from a generic cross-reference tool. Before substitution, compare the complete pinout, VFQFN dimensions and exposed-pad connection, supply current, frequency bands, control signaling, RF output level, and lifecycle documentation.
موصى به
بيانات مرجعية هندسية لـ SI4123-D-GM — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | SI4123-D-GMR |
|---|---|---|
| Package | 28-pin VFQFN with exposed pad | 28-pin VQFN with exposed pad |
| Brand | Skyworks Solutions Inc. | Silicon Laboratories |
أبرز الفروقات
- Integrated VCO architecture (مقابلSI4123-D-GMR)
- Dual-band frequency coverage (مقابلSI4123-D-GMR)
- Low-voltage wireless positioning (مقابلSI4123-D-GMR)
ملاحظات التصميم
Follow the manufacturer reference layout for the 28-pin VFQFN exposed-pad package. Keep RF output routing short and controlled, connect the exposed pad using the recommended thermal-via pattern, and keep the reference-clock and loop-filter paths away from sensitive RF nodes. Because the supplied data identifies an exposed-pad package, inspect the package drawing and land pattern before fabrication rather than relying only on the generic QFN name.
Design the 2.7 V to 3.6 V supply rail with local high-frequency decoupling and adequate transient response for the listed 18 mA to 27 mA operating-current range. Place bypass capacitors close to the supply and ground pins, verify startup behavior, and avoid noisy digital or switching-regulator coupling into the synthesizer reference and RF sections. Confirm the actual current at the intended frequency and output setting rather than sizing only from the headline range.
Validate phase noise, reference spurious signals, tuning accuracy, and output matching across the intended frequency bands. The supplied data gives broad frequency and output-power ranges but does not provide phase-noise or spur plots, so those requirements must be measured or obtained from the manufacturer. Use controlled impedance, short RF paths, and a defined RF load during prototype measurements.
Do not substitute a similarly named SI4123 variant without checking the complete pinout, package dimensions, exposed-pad connection, frequency range, supply limits, control interface, and RF output specification. The supplied comparison page describes SI4123-D-GMR as potentially similar, but it does not provide complete verified parameter values. Treat cross-reference pages as leads for engineering review, not as proof of drop-in replacement.
معلومات الامتثال
The supplied search snippets do not provide authoritative compliance declarations for this part. RoHS, REACH, lead-free, halogen-free, and conflict-minerals status should be confirmed from the manufacturer or authorized distributor documentation.
