SI4123-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks Solutions
料号： SI4123-D-GT ✗ 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-GT 概述
An RF frequency synthesizer is a phase-locked-loop device that generates stable, programmable RF or IF carrier signals for wireless transmitters, receivers, and related communication equipment. The SI4123-D-GT belongs to the RF synthesizer family and integrates two VCOs, allowing dual-band operation without requiring external VCOs or varactor diodes. Its intended role is local oscillator or carrier generation in systems requiring accurate frequency selection and low-noise RF performance.
Verified product information lists a 900 MHz to 1.8 GHz primary frequency range and a 750 MHz to 1.5 GHz secondary range, an output-power range of -14 dBm to +1 dBm, and harmonic levels from -26 dBc to -20 dBc. The specified supply-voltage range is 2.7 V to 3.6 V, with current consumption from 18 mA to 27 mA. These values position the device for compact, low-power wireless products operating near direct-conversion or low-IF architectures.
The integrated VCO approach reduces external passive-component count compared with discrete oscillator implementations. It can also simplify RF board layout by eliminating external varactor tuning networks, although loop-filter selection, reference routing, supply decoupling, output matching, and phase-noise requirements remain essential to achieve predictable RF performance.
Typical applications include wireless personal communications, dual-band cellular equipment, RF transceivers, IF-generating receiver paths, and compact RF communication modules. The device is most appropriate when the system operates from a 2.7 V to 3.6 V supply and needs programmable synthesis across either of the verified frequency bands.
Designers should verify the manufacturer’s reference circuit and pin-specific programming requirements before layout. Keep the reference, synthesizer, and RF output paths short, provide the required bypass capacitors at the supply pins, and preserve controlled impedance routing for high-frequency outputs. Because exact pin names, register behavior, loop-filter values, and absolute phase-noise data were not supplied in the verified data, those details must be confirmed from the manufacturer datasheet.
This page consolidates the verified manufacturer description, distributor package information, frequency, power, supply, and current data into an application-oriented engineering summary. It also distinguishes true drop-in alternatives from functional RF substitutes, preventing redesign-level parts from being presented as pin-compatible replacements.
直接替换替代料： SI4123-D-GT ——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-GT （相同外形与封装尺寸） ——差异在于 Package, RoHS Status, Device Type, Input-to-Output Ratio, Integrated VCOs.
快速对比工具——选择替代料号进行并排对比：
SI4113-D-GT
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →SI4123-D-GT 规格参数
| Device Type | Dual-band RF frequency synthesizer with integrated VCOs |
| Primary Frequency Range | 900 MHz to 1800 MHz |
| Secondary Frequency Range | 750 MHz to 1500 MHz |
| Maximum Stated Frequency | 1.8 GHz |
| Output Power Range | -14 dBm to +1 dBm |
| Harmonic Level Range | -26 dBc to -20 dBc |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Supply Current Range | 18 mA to 27 mA |
| Integrated VCOs | 2 integrated VCOs |
| 封装 | 24-pin TSSOP, 0.173 inch width, 4.40 mm width |
| 安装类型 | Surface mount |
| Product Category | Phase-locked loop / RF synthesizer |
| Application Domain | Wireless personal communications |
| RoHS 状态 | RoHS indicated for SI4123-D-GT in verified comparison data |
SI4123-D-GT 24-pin tssop, 0.173 inch width, 4.40 mm width 引脚配置指南
SI4123-D-GT（24-pin tssop, 0.173 inch width, 4.40 mm width 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-GT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SI4123-D-GT 适用于 6 应用s: Dual-Band Wireless Transceiver, Cellular RF Signal Generation, Low-IF Receiver, Compact RF Communication Module, Wireless Personal Communications, RF Test and Measurement Front End.
Dual-Band Wireless Transceiver
The SI4123-D-GT is suitable for dual-band wireless transceiver platforms that need programmable RF synthesis in a compact 2.7 V to 3.6 V design. Its integrated VCOs eliminate external VCOs and varactor diodes, reducing the external component count described by Skyworks Solutions. The verified 900 MHz to 1800 MHz and 750 MHz to 1500 MHz ranges make it relevant for systems supporting two RF bands. The designer must still set the loop-filter components and confirm phase noise, reference requirements, and output power for each channel.
推荐
Cellular RF Signal Generation
The SI4123-D-GT can provide programmable frequency synthesis for RF sections of compact cellular and personal-wireless equipment. Its dual-band capability supports product variants that must cover the verified 900 MHz to 1800 MHz range and the 750 MHz to 1500 MHz range. The 18 mA to 27 mA operating-current range helps power-conscious designers, while the 2.7 V to 3.6 V supply range simplifies integration with low-voltage RF systems. Exact channel plans, modulation requirements, and regulatory limits must be validated separately.
推荐
Low-IF Receiver
In a low-IF receiver, the SI4123-D-GT can generate a controlled local oscillator or IF-related carrier for signal conversion. The integrated dual-VCO architecture helps avoid discrete tuning components and can reduce board-level part count. The verified output-power range of -14 dBm to +1 dBm provides a useful starting point for RF path planning, although the actual usable level depends on configuration and matching. Designers should use controlled-impedance routing and keep the reference and sensitive RF nodes away from noisy digital return paths.
推荐
Compact RF Communication Module
The SI4123-D-GT is appropriate for compact RF communication modules where a dedicated synthesizer is needed without an external VCO assembly. Its integrated VCOs support a lower component count, while the verified TSSOP-24 surface-mount package supports dense PCB construction. The module designer must plan local bypass capacitors, a stable reference source, an approved loop filter, and RF output matching. The 1.8 GHz maximum stated frequency should be checked against the module’s antenna, matching network, enclosure, and regulatory requirements.
推荐
Wireless Personal Communications
The SI4123-D-GT is explicitly targeted by Skyworks Solutions at wireless personal communications, combining dual-band synthesis with integrated VCOs. It is useful where product variants need different RF ranges without changing the external oscillator architecture. The verified 2.7 V to 3.6 V supply range and 18 mA to 27 mA current range support low-power integration, while the output range of -14 dBm to +1 dBm informs the RF budget. Exact receiver sensitivity and transmitter compliance remain dependent on the complete signal chain, not this IC alone.
推荐
RF Test and Measurement Front End
The SI4123-D-GT can serve as a programmable RF signal source for selected test and measurement front ends when its verified frequency, supply, and output specifications fit the instrument architecture. Its dual-band coverage allows the same synthesizer platform to address two instrument bands, and the integrated VCOs reduce the complexity of maintaining multiple external oscillators. For measurement-grade performance, the engineer must verify phase noise, tuning accuracy, reference stability, calibration method, and output accuracy from the complete datasheet rather than infer them from maximum frequency alone.
推荐
推荐产品汇总
工程参考数据： SI4123-D-GT ——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 | SI4113-D-GT |
|---|---|---|
| Package | 24-pin TSSOP, 0.173 inch width, 4.40 mm width | TSSOP-24 |
| Brand | Skyworks Solutions | Skyworks Solutions |
关键差异点
- Integrated dual-VCO architecture （对比 Discrete VCO implementation)
- Dual-band frequency coverage （对比 Single-band RF synthesizer)
- Low-voltage RF integration （对比 Higher-voltage RF synthesizer)
- Wireless personal-communications positioning （对比 General-purpose clock generator)
设计说明
Use the manufacturer’s reference layout as the starting point for the 24-pin TSSOP footprint. Keep the reference path, VCO-related connections, supply pins, and RF outputs short, and preserve controlled impedance for RF routes. Maintain a continuous ground reference beneath and around the device where the package and board stackup allow it; inadequate return paths can degrade phase noise and RF isolation even when the nominal component values are correct.
The SI4123-D-GT is verified for a 2.7 V to 3.6 V supply range and 18 mA to 27 mA current range. Place the required bypass capacitors close to the supply pins, verify their voltage and temperature ratings, and keep switching-regulator noise away from the reference and RF paths. Treat 27 mA as a verified upper listed current rather than a complete worst-case design limit, because transient, temperature, and configuration data were not provided.
The integrated VCO architecture reduces external tuning components but does not eliminate RF layout sensitivity. Route the outputs through the intended matching network, minimize discontinuities, and keep the loop-filter and reference components close to their associated pins according to the manufacturer circuit. Validate phase noise, spur levels, output power, and tuning accuracy with the final board and enclosure rather than relying only on nominal synthesizer specifications.
合规信息
RoHS status is indicated by the verified SI4123-D-GT comparison listing. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was supplied.
