SI4123-D-GM - Dual-Band RF Synthesizer | Skyworks
料号： SI4123-D-GM ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SI4123-D-GM 概述
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.
直接替换替代料： SI4123-D-GM ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SI4123-D-GM （相同外形与封装尺寸） ——差异在于 Manufacturer, Number of Circuits.
快速对比工具——选择替代料号进行并排对比：
SI4123-D-GMR
✅ 直接替换📋 参考替代料（不在目录中）
SI4123-D-GM 规格参数
| 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 |
| 电源电流 | 18 mA to 27 mA |
| Output Power | -14 dBm to +1 dBm |
| Harmonic Rejection | -26 dBc to -20 dBc |
| 封装 | 28-pin VFQFN with exposed pad |
| Number of Circuits | 13 circuits |
| Application Category | Clock generators, PLLs, and frequency synthesizers |
| RF Application | Wireless personal communications |
| 安装类型 | Surface mount |
| Manufacturer | Skyworks Solutions Inc. |
| 生命周期状态 | Obsolete |
SI4123-D-GM 28-pin vfqfn with exposed pad 引脚配置指南
SI4123-D-GM（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： SI4123-D-GM.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI4123-D-GM 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： SI4123-D-GM ——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 | SI4123-D-GMR |
|---|---|---|
| Package | 28-pin VFQFN with exposed pad | 28-pin VQFN with exposed pad |
| Brand | Skyworks Solutions Inc. | Silicon Laboratories |
关键差异点
- Integrated VCO architecture （对比 SI4123-D-GMR)
- Dual-band frequency coverage （对比 SI4123-D-GMR)
- Low-voltage wireless positioning （对比 SI4123-D-GMR)
设计说明
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.
合规信息
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.
