SI4112-BM - 1 GHz IF Synthesizer | Silicon Labs
MPN: SI4112-BM ✗ Tapus ng BuhaySI4112-BM Ulas
A frequency synthesizer is a clock-and-timing integrated circuit that generates a controlled output frequency from a reference source. The PLL and integrated VCO provide a compact way to produce stable intermediate-frequency signals in RF receivers, transmitters, and communication systems. In the product hierarchy, this part is a frequency-synthesizer IC, then a PLL/clock-and-timing IC, then a timing and RF synthesis building block within a wireless communication system.
The verified listing gives the device's headline frequency capability as 1 GHz. Its 28-VFQFN exposed-pad package is intended for compact surface-mount designs and provides a defined thermal and electrical land pattern. Because the exposed pad is part of the package, the PCB footprint must include the manufacturer's recommended thermal-pad connection and layout. The listed operating temperature range is -40°C to 85°C. Other detailed electrical timing, phase-noise, current, supply-voltage, and tuning-range values were not included in the supplied data and must be confirmed from the manufacturer datasheet before design release.
Typical applications include IF synthesis in wireless personal communications, RF receiver and transmitter signal chains, and other communication systems requiring a compact integrated synthesizer. The integrated VCO can reduce the external component count compared with a discrete VCO implementation, but it does not remove the need to validate loop stability, reference noise, tuning range, output drive, and layout performance.
The principal design consideration is lifecycle risk: SI4112-BM is marked obsolete in the verified GlobalSpec result. For new production, evaluate an active replacement only after checking its frequency range, package, pinout, supply voltage, reference requirements, and RF performance. Treat distributor inventory as temporary and validate the specific lot before committing to a long-term design.
This page consolidates the verified manufacturer and distributor information, explicit lifecycle status, package identity, and sourcing context. It also records missing datasheet parameters rather than inferring them, while the comparison and application notes help engineers distinguish an obsolete but documented device from an unverified substitute.
Mga alternatibo na pwedeng ilagay na SI4112-BM — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Wala ng magagamit na drop-in alternatibo para sa produkto na ito.
Hilingin ang AlternatiboSI4112-BM Mga Spesipikasyon
| Device Type | Frequency Synthesizer IC |
| Synthesis Function | IF and dual-band RF frequency synthesis |
| Maximum Stated Frequency | 1 GHz |
| Number of Circuits | 1 |
| Integrated VCO | Yes |
| Input Type | Crystal |
| Type ng Output | Clock |
| Temperature na Operasyon | -40°C to 85°C |
| Packhaging | 28-MLP-EP, 5x5 mm |
| Package Type | 28-VFQFN exposed pad |
| Mounting | SMD (SMT) |
| Katayuan ng Lifecycle | Obsolete (EOL) |
Gabay sa Pin Configuration ng SI4112-BM 28-vfqfn exposed pad
Pin configuration para sa SI4112-BM (28-vfqfn exposed pad package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa SI4112-BM.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
SI4112-BM ay nararapat para sa 6 aplikasyons: IF Signal Generation in Wireless Receivers, Wireless Transmitter IF Up-Conversion, Dual-Band RF Communication Systems, Legacy Wireless Handset Repair, RF Test and Measurement Fixtures, Industrial RF Communication Modules.
IF Signal Generation in Wireless Receivers
SI4112-BM fits legacy wireless receiver signal chains that require IF frequency synthesis from a crystal reference. Its verified identity as a frequency-synthesizer IC with clock output and 1 GHz stated capability makes it suitable for maintaining an existing IF-generation stage rather than creating a new platform from scratch. The integrated VCO approach can reduce external RF components, but the design must preserve the original reference, feedback, and output-network topology. Because the device is obsolete, use controlled inventory and validate phase noise, lock behavior, and output level on the actual receiver fixture.
Inirekomenda
Wireless Transmitter IF Up-Conversion
The SI4112-BM can be evaluated in a legacy transmitter path where a local IF oscillator is required for frequency conversion. Its stated 1 GHz synthesizer capability and crystal input provide a compact clock-generation function, while the integrated VCO architecture avoids relying on a separate VCO assembly. Integration does not guarantee RF performance: the transmitter design must verify output amplitude, spurious content, tuning range, reference sensitivity, and impedance matching. Obsolete lifecycle status makes this approach most appropriate for repairs or qualified legacy platforms, not unrestricted new-product launches.
Inirekomenda
Dual-Band RF Communication Systems
SI4112-BM is relevant to communication systems requiring IF or dual-band RF synthesis because the related Si4112-D family is described by Skyworks as performing those functions. The verified package and lifecycle data make it useful for maintaining a proven architecture with a 28-MLP-EP footprint. Engineering review should compare the target synthesizer's tuning range and channel plan, then measure lock range, reference spur levels, phase noise, and output isolation in the final board. A related family member is not automatically a drop-in replacement; the original layout and RF test limits must be retained during validation.
Inirekomenda
Legacy Wireless Handset Repair
For repair and continuation of an existing wireless handset design, SI4112-BM may be practical when the original board uses the same 28-MLP-EP footprint and the replacement must match the proven clock and IF behavior. The verified distributor inventory data indicates availability through multiple channels, but the part is obsolete, so availability should be treated as temporary. Procurement should include traceability, ESD handling, and a sample-level RF test. Do not substitute a related synthesizer solely by family name; confirm pinout, reference frequency, supply voltage, and output-network requirements first.
Inirekomenda
RF Test and Measurement Fixtures
A laboratory or production fixture may use SI4112-BM to reproduce the IF signal expected by a legacy communication assembly. The device's crystal input, clock output, 1 GHz stated frequency capability, and integrated synthesizer function make it useful for controlled diagnostic setups. The fixture should use the original reference and RF interfaces wherever possible so that differences are attributable to the replacement rather than a changed test environment. Since detailed phase-noise, lock, and output specifications were not supplied, characterize them experimentally before using the device as a general-purpose signal source.
Inirekomenda
Industrial RF Communication Modules
SI4112-BM may be considered for an obsolete industrial communication module that retains the same RF architecture and requires a maintenance-only supply. The compact 28-MLP-EP package supports dense equipment, and the integrated VCO can simplify the RF synthesizer implementation compared with discrete components. However, industrial production programs need a stable lifecycle path, documented thermal behavior, and guaranteed sourcing; none of those lifecycle assurances can be inferred from the distributor pages. Use a controlled BOM and a last-time-buy or repair strategy only after confirming the system's actual operating requirements.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for SI4112-BM — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | Si4112-D-GM |
|---|---|---|
| Device Type | Frequency Synthesizer IC | RF synthesizer |
| Brand | Silicon Labs | Skyworks |
| Synthesis Function | IF and dual-band RF synthesis | IF and dual-band RF synthesis |
| Verified Drop-In Status | Not applicable | Not verified |
Pangunahing mga Pagkakaiba
- Integrated IF and dual-band RF synthesis (kumpara saSi4112-D-GM)
- 1 GHz stated synthesizer capability (kumpara saSi4112-D-GM)
- Obsolete lifecycle classification (kumpara saSi4112-D-GM)
Talaan ng Disenyo
Use the manufacturer footprint for the 28-MLP-EP package and preserve the exposed-pad connection specified by the datasheet. Keep the reference, feedback, decoupling, and RF output components in the recommended placement and impedance environment. The verified excerpts do not include trace dimensions or loop-filter values, so the original CAD or current manufacturer layout data should control the PCB release.
Do not treat Si4112-D-GM as a drop-in replacement solely because it belongs to the related Si4112-D family. Verify pinout, package dimensions, supply voltage, reference-input requirements, tuning range, output drive, and RF performance before substitution. Also do not infer current price or lead time from historical inventory; the target is obsolete and procurement availability must be reconfirmed for each order.
Preserve the original reference and feedback layout when evaluating this synthesizer. Compare lock range, reference spur levels, phase noise, output amplitude, and harmonic content at the same fixture and temperature used by the original product. The supplied data does not quantify these parameters, so laboratory characterization is required before using a replacement or salvaged device in a performance-critical RF path.
Impormasyon ng Pagsunod sa Kautusan
The supplied excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The product is listed as obsolete; compliance declarations must be obtained from the manufacturer or an authorized supply-chain source.
