SI4122-D-GM - 1.5 GHz Dual-Band RF Synthesizer | Skyworks
N.º de pieza: SI4122-D-GM ✓ ActivoSI4122-D-GM Descripción general
An RF frequency synthesizer is a phase-locked-loop device that generates or translates a stable high-frequency carrier from a reference clock. Within the broader semiconductor hierarchy, the SI4122-D-GM is a PLL-based clock and timing IC, an RF synthesizer, and ultimately an integrated circuit used for wireless frequency generation. Its integrated VCOs reduce the need for external VCO components and varactor diodes, supporting compact and power-efficient wireless transmitter or receiver designs.
Key features include support for IF and dual-band RF synthesis, integrated VCOs, RF2 and IF outputs, and a usable upper frequency of 1.5 GHz. According to the available manufacturer information, the device is designed to reduce external passive-component count and eliminate external VCOs and varactor diodes. Those characteristics make it suitable for price-sensitive, low-power personal wireless communications equipment where integration and board area are important.
Technically, the device combines a phase-locked loop, integrated voltage-controlled oscillators, reference and RF synthesis functions, and an IF output path. The available product data specifies a supply-voltage range of 2.7 V to 3.6 V and current consumption of 18 mA to 27 mA. Exact phase noise, tuning-step, reference-input, temperature-coefficient, lock-time, and output-impedance details were not included in the supplied source data and therefore require confirmation from the manufacturer datasheet before final design release.
Typical applications include cellular and personal wireless communication equipment, dual-band RF front ends, wireless handsets, RF modems, and other systems requiring local RF carrier generation. The integrated VCO arrangement is particularly relevant to compact designs that cannot accommodate separate discrete VCO and varactor networks. The 2.7 V to 3.6 V operating range also allows use with low-voltage RF system rails.
Designers should preserve the exposed-pad thermal and electrical requirements of the 28-pin VQFN package and follow the manufacturer layout guidance for high-frequency RF routing. Reference, feedback, supply, and output paths should be kept short and appropriately decoupled. Since detailed loop-filter, reference-sensitivity, and decoupling values were not supplied in the verified excerpts, they must be taken directly from the official datasheet rather than inferred.
This product page consolidates verified distributor pricing, package and operating information, available same-family alternatives, and application-specific engineering guidance into one engineering reference. It also clearly separates confirmed parameters from data that still requires datasheet confirmation, helping designers avoid unsupported assumptions during schematic and PCB-layout reviews.
Alternativas directas para SI4122-D-GM — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con SI4122-D-GM (mismo factor de forma y huella) — difiere en Package, Product Type, Mounting Type, Maximum Frequency.
SI4122-D-GMR
✅ Sustitución directaConsulte el precio
Ver hoja de datos →SI4122-D-GTR
✅ Sustitución directaConsulte el precio
Ver hoja de datos →SI4113-D-GM
✅ Sustitución directaConsulte el precio
Ver hoja de datos →SI4122-D-GM Especificaciones
| Product Type | Dual-band RF frequency synthesizer IC |
| Maximum Stated Frequency | 1.5 GHz |
| Primary RF Frequency Range | 900 MHz to 1800 MHz |
| Secondary RF Frequency Range | 750 MHz to 1500 MHz |
| Output Power Range | -14 dBm to 1 dBm |
| Harmonic Range | -26 dBc to -20 dBc |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Supply Current Range | 18 mA to 27 mA |
| Output Signals | RF2 and IF outputs |
| VCO Integration | Integrated VCOs |
| Encapsulado | 28-pin VQFN with exposed pad |
| Tipo de montaje | Surface mount |
| Temperatura de funcionamiento | -40 °C to +85 °C |
| Recuento de pines | 28 pins |
| Manufacturer Description | IF and dual-band, low-noise RF frequency synthesis |
Guía de configuración de pines de SI4122-D-GM 28-pin vqfn with exposed pad
Configuración de pines para SI4122-D-GM (encapsulado 28-pin vqfn with exposed pad). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para SI4122-D-GM.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
SI4122-D-GM es adecuado para 6 aplicacións: Dual-Band Cellular Radio, Wireless Handset RF Front End, RF Modem and Transceiver, Industrial Wireless Data Link, RF Test and Measurement Instrument, Low-Voltage RF Communication Module.
Dual-Band Cellular Radio
SI4122-D-GM fits dual-band cellular radio designs requiring local carrier generation from a stable reference. Its verified dual-band ranges of 900 MHz to 1800 MHz and 750 MHz to 1500 MHz, together with RF2 and IF outputs, support transmitter and receiver signal-chain integration. The device operates from 2.7 V to 3.6 V and consumes 18 mA to 27 mA, which are useful constraints for compact handset and personal-communication platforms. Integrated VCOs can also reduce external VCO and varactor-component count. Final suitability depends on verifying phase noise, lock time, channel spacing, reference sensitivity, and output matching against the cellular standard.
Recomendado
Wireless Handset RF Front End
The SI4122-D-GM can support compact wireless-handset RF front ends where board area and power consumption are tightly constrained. Its integrated VCOs reduce the passive-component burden associated with discrete VCO and varactor implementations, while the 28-pin VQFN exposed-pad package supports dense surface-mount construction. The verified 1.5 GHz maximum frequency and dual-band coverage align with wireless personal-communications equipment. Engineers must still confirm output-power margin, phase-noise performance, locking behavior, and package-specific thermal and layout requirements before using it in a production handset.
Recomendado
RF Modem and Transceiver
SI4122-D-GM is suitable for RF modems and transceiver subsystems that need an on-chip RF synthesizer with both RF2 and IF outputs. The verified operating range reaches 1.5 GHz, output power is -14 dBm to 1 dBm, and supply current is 18 mA to 27 mA, providing a concrete starting point for power budgeting. Its 2.7 V to 3.6 V operating supply is suitable for low-voltage RF logic rails. Integration can shorten RF signal paths and reduce external components, although reference routing, loop-filter design, output matching, and lock-time verification remain essential before schematic release.
Recomendado
Industrial Wireless Data Link
The SI4122-D-GM can be evaluated for industrial wireless links operating in sub-GHz or cellular-related frequency allocations covered by its stated 750 MHz to 1500 MHz and 900 MHz to 1800 MHz ranges. Its integrated VCO architecture lowers the component count of the RF synthesizer, while its 2.7 V to 3.6 V supply range supports low-voltage embedded systems. In industrial equipment, designers should account for temperature performance across the verified -40 °C to +85 °C range, electromagnetic interference, reference-source stability, and the thermal design of the exposed pad.
Recomendado
RF Test and Measurement Instrument
SI4122-D-GM may be used in RF test equipment as a local source for controlled carrier generation. The verified -14 dBm to 1 dBm output range, RF2 output, and 1.5 GHz upper stated frequency make it relevant to compact instrument subcircuits. Because an RF synthesizer’s phase noise and reference purity can dominate measurement accuracy, the selected SI4122-D-GM configuration must be verified against the instrument’s noise floor and settling requirements. Controlled reference routing, isolated supply decoupling, and careful management of harmonics in the verified -26 dBc to -20 dBc range are important for predictable results.
Recomendado
Low-Voltage RF Communication Module
SI4122-D-GM is appropriate for compact RF communication modules built around a 2.7 V to 3.6 V supply. Its 18 mA to 27 mA current range provides a defined basis for power estimation, and the integrated VCO implementation can reduce board area by eliminating separate external VCO and varactor networks. The device is particularly relevant to private wireless, personal communications, and dual-band radio products. Before deployment, engineers should confirm lock time, reference-input sensitivity, channel spacing, spur performance, output matching, and exposed-pad grounding directly against the manufacturer documentation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SI4122-D-GM — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SI4122-D-GMR | SI4122-D-GTR | SI4113-D-GM |
|---|---|---|---|---|
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. |
| Package | VQFN-28 with exposed pad | VQFN-28 with exposed pad | VQFN-28 with exposed pad | VQFN-28 with exposed pad |
Diferenciadores clave
- Explicit dual-band and IF synthesis capability (frente a SI4113-D-GM)
- Verified 1.5 GHz RF synthesis class (frente a SI4122-D-GTR)
- Documented output performance range (frente a SI4113-D-GM)
- Low-voltage operating envelope (frente a SI4122-D-GMR)
Notas de diseño
Route the reference, RF output, feedback, and supply connections using the manufacturer reference layout. Keep the VQFN-28 exposed pad connected to the required ground-plane structure and minimize inductance between the pad and thermal vias. High-frequency synthesizer performance can be affected by trace length, return paths, and supply-return discontinuities, so do not substitute a generic QFN land pattern without checking the official package drawing.
Design the 2.7 V to 3.6 V supply rail to remain within the verified operating range under transient conditions. Place decoupling capacitors at the package supply pins and preserve a low-impedance return path to the exposed-pad ground structure. The verified current range of 18 mA to 27 mA is a useful baseline, but actual current can depend on operating mode and frequency; verify the datasheet operating-current conditions and capacitor values before schematic release.
Treat the reference input and RF outputs as controlled-impedance paths appropriate to the operating frequency. Keep sensitive reference routing away from RF output and switching-supply return currents, and confirm the required termination network from the manufacturer guidance. The available data specifies output power and harmonics but not impedance or reference sensitivity, so those values must be obtained from the official datasheet before modeling matching networks or calculating link budgets.
Use the exposed pad as both an electrical connection and a thermal path. Estimated power dissipation cannot be calculated from the supplied data because the device's internal efficiency and detailed operating-current conditions are not provided. Confirm maximum RF output conditions, ambient temperature, and the package thermal data in the datasheet, then size copper and thermal vias for the full -40 °C to +85 °C operating-temperature range.
Do not treat SI4122-D-GM, SI4122-D-GMR, SI4122-D-GTR, and SI4113-D-GM as automatically interchangeable based only on the search excerpts. Confirm pin names, exposed-pad requirements, frequency ranges, reference frequency, temperature grade, and ordering codes. Also do not infer a cross-brand drop-in replacement from generic parametric-search results because RF synthesizer compatibility depends on matching and loop behavior in addition to package and headline frequency limits.
Información de cumplimiento
The verified excerpts did not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than being inferred from the distributor listings.
