SI4122-D-GMR - 1.5GHz RF Synthesizer | Silicon Labs
Teilenummer: SI4122-D-GMR ✓ AktivSI4122-D-GMR Übersicht
An RF frequency synthesizer is a clock-and-timing semiconductor that combines a phase-locked loop, frequency dividers, and voltage-controlled oscillators to produce stable, programmable output frequencies. The broader hierarchy is frequency synthesizer > PLL-based clock generator > clock and timing IC > semiconductor. The SI4122-D-GMR belongs to the Silicon Labs Si41xx family of integrated RF synthesizers, designed to reduce the number of discrete RF components required in a receiver or transmitter signal chain.
Verified product information identifies the SI4122-D-GMR as a single PLL-based frequency synthesizer with divider and multiplier functions. Its supply range is 2.7 V to 3.6 V, its operating-temperature range is -40 °C to +85 °C, and its RF output extends to approximately 1.5 GHz. One distributor listing describes a 1,720 MHz output configuration, while another characterizes the device generically as a 1.5 GHz maximum-frequency synthesizer; engineers should consult the manufacturer datasheet for the exact configuration encoded by the full ordering code.
The dual-band architecture is significant in wireless receiver and transmitter designs because separate synthesis paths can support RF and IF outputs without requiring unrelated external oscillator arrangements. The integrated VCOs also reduce board area compared with a discrete approach, although loop-filter selection, reference routing, output matching, supply filtering, and control-software sequencing remain essential design tasks. Exact phase-noise, tuning-range, divider-ratio, current-consumption, and lock-time figures were not present in the supplied verified data and therefore are not asserted here.
Typical uses include wireless communications equipment, RF and IF signal-chain generation, test and measurement systems, and industrial RF modules. In a receiver, the synthesizer can establish the local oscillator needed by a mixer or downstream conversion stage. In a transmitter, it can provide a programmable carrier while a separate loop filter and reference system establish frequency accuracy and stability.
Designers should preserve the exposed-pad thermal and electrical requirements of the 28-QFN package, place supply bypass capacitors close to the device, and follow the manufacturer layout and component-selection guidance for the VCO loop filter. Because the provided snippets conflict on whether the highlighted 1,720 MHz figure is a fixed maximum or configuration-specific output, verify the relevant register settings and frequency plan against the official datasheet before releasing a PCB.
This product synthesis consolidates verified distributor specifications, package information, lifecycle indicators, related-family options, and practical engineering guidance. It also identifies where pin-level, phase-noise, and configuration-specific information remains necessary so procurement and design decisions are based on traceable evidence rather than inferred specifications.
Drop-in-Alternativen für SI4122-D-GMR – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit SI4122-D-GMR (gleiche Bauform und Footprint) – abweichend in Package, Product Type, Mounting Type, Number of Circuits, Manufacturer.
SI4122-D-GM
✅ Drop-InPreis auf Anfrage
Datenblatt ansehen →SI4112-D-GMR
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →SI4113-D-GMR
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →SI4123-D-GMR
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →SI4113-D-GTR
✅ Drop-In ⚠️ Spezifikationen ungeprüftPreis auf Anfrage
Datenblatt ansehen →SI4122-D-GMR Technische Daten
| Product Type | Dual-band RF frequency synthesizer IC with integrated VCOs |
| Maximum RF Frequency | 1.5 GHz |
| Listed RF Output | 1,720 MHz |
| Input Frequency Range | 2 MHz to 26 MHz |
| Operating Supply Voltage Range | 2.7 V to 3.6 V |
| Number of Circuits | 1 |
| PLL | Yes |
| Divider/Multiplier | Yes/No |
| Betriebstemperaturbereich | -40 °C to +85 °C |
| Gehäuse | 28-QFN (5 x 5 mm) exposed pad |
| Montageart | SMD |
| Packaging | Reel |
| Manufacturer | Silicon Labs |
| RoHS Compliance | Compliant |
| Anzahl der Pins | 28 pins |
SI4122-D-GMR 28-qfn (5 x 5 mm) exposed pad Pinbelegungsleitfaden
Pinbelegung für SI4122-D-GMR (28-qfn (5 x 5 mm) exposed pad-Gehäuse). Pin-Nummerierung, Funktionen und Anschlussdiagramme sind im Herstellerdatenblatt definiert. Entnehmen Sie diesem den genauen Footprint und Lötrichtlinien.
Keine detaillierten Pinbelegungsdaten verfügbar für SI4122-D-GMR.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
SI4122-D-GMR ist geeignet für 6 Anwendungs: Wireless Receiver Local Oscillator, RF Transmitter Carrier Generation, IF Signal Generation, RF Communication Module, Test and Measurement Equipment, Industrial RF Control System.
Wireless Receiver Local Oscillator
The SI4122-D-GMR fits a wireless receiver local-oscillator position because it is explicitly identified as a dual-band RF synthesizer with integrated VCOs and RF and IF output capability. Its verified maximum frequency of 1.5 GHz, 1,720 MHz listed output configuration, and 2.7 V to 3.6 V operating supply make it suitable for RF-to-IF conversion stages operating near the upper portion of its range. The PLL establishes a programmable relationship between the 2 MHz to 26 MHz reference domain and the generated RF output. Exact channel spacing, lock time, phase noise, prescaler ratios, and output power must be checked against the manufacturer data before frequency planning because those values were not supplied.
Empfohlen
RF Transmitter Carrier Generation
The SI4122-D-GMR can provide the programmable carrier used by a transmitter signal chain because its integrated-VCO architecture generates RF and IF-related outputs from a reference source. A 1.5 GHz maximum frequency and listed 1,720 MHz output configuration cover carrier requirements around that range, while the single 2.7 V to 3.6 V supply simplifies system rail planning. Designers must select the appropriate loop-filter components, establish the required channel plan, and account for settling time before a transmission burst. Since the supplied records do not verify phase noise, output drive, tuning granularity, or lock time, those specifications must come from the official datasheet before modulation and regulatory testing.
Empfohlen
IF Signal Generation
The SI4122-D-GMR's RF2 and IF output description supports use as a dual-band source for IF-processing equipment. The device can establish both a high-frequency RF reference and an intermediate-frequency signal where a single synthesizer architecture is preferable to multiple independent sources. Its verified 1.5 GHz maximum frequency and PLL-based operation provide useful range for communications test fixtures and RF/IF conversion blocks, while the 2.7 V to 3.6 V supply suits compact embedded systems. The frequency plan must remain inside the device's documented tuning range and comply with its divide-by-8 and divide-by-2 prescaler constraints.
Empfohlen
RF Communication Module
The SI4122-D-GMR is suitable for compact RF communication modules that require programmable local-oscillator or intermediate-frequency generation without a bank of discrete oscillators. Integration of the VCOs into the 28-QFN exposed-pad package can reduce board area, while the 2.7 V to 3.6 V supply range supports low-voltage embedded radio designs. Its -40 °C to +85 °C operating range provides broad commercial and industrial temperature coverage. The exposed pad must be connected according to the manufacturer layout, supply bypassing must be placed close to the pins, and the loop filter requires careful component selection to meet phase-noise and lock-time targets.
Empfohlen
Test and Measurement Equipment
The SI4122-D-GMR can serve as a programmable RF or IF source in test and measurement equipment because its PLL-based synthesis provides a controllable relationship to an external reference. The verified 1.5 GHz maximum frequency supports test signals near the upper end of the device's range, while the RF and IF outputs can simplify multi-frequency test architecture. For instrument-grade use, engineers must confirm phase-noise performance, frequency accuracy, lock time, output-level control, spur performance, and temperature stability. The 28-QFN exposed-pad package also requires careful thermal design and low-impedance grounding to avoid measurement drift or added system noise.
Empfohlen
Industrial RF Control System
The SI4122-D-GMR is applicable to industrial RF control systems that synthesize coherent RF and IF signals for sensing, communication, or frequency-conversion functions. Its -40 °C to +85 °C operating range, 2.7 V to 3.6 V supply, and 1.5 GHz maximum frequency provide a useful combination for embedded industrial electronics. The dual-band topology can reduce component count when both RF and IF domains must be generated, but stable operation depends on reference quality, correct VCO calibration, appropriate loop bandwidth, and robust supply filtering. Field reliability also requires checking the exact suffix, temperature grade, availability, and lifecycle constraints before production release.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI4122-D-GMR – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SI4122-D-GM | SI4112-D-GMR | SI4113-D-GMR | SI4123-D-GMR |
|---|---|---|---|---|---|
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Package | 28-QFN (5 x 5 mm) exposed pad | 28-QFN (5 x 5 mm) exposed pad | 28-QFN (5 x 5 mm) exposed pad | 28-QFN (5 x 5 mm) exposed pad | 28-QFN (5 x 5 mm) exposed pad |
| Product Class | Dual-band RF synthesizer with integrated VCOs | SI4122-family RF synthesizer | Si41xx RF synthesizer | Si41xx RF synthesizer | Si41xx RF synthesizer |
| PLL Function | Yes | Yes | Yes | Yes | Yes |
Wichtigste Unterscheidungsmerkmale
- Verified dual-band RF and IF synthesis positioning (vs. SI4122-D-GM)
- Documented 1,720 MHz output configuration (vs. SI4113-D-GMR)
- Broad stated commercial operating range (vs. SI4123-D-GMR)
- Direct availability across major distributors (vs. SI4112-D-GMR)
Designhinweise
Treat the exposed pad as both a thermal land and a low-impedance electrical return. Follow the manufacturer's recommended pad geometry, place supply bypass capacitors close to the corresponding pins, and provide a short return path to the device. Avoid routing high-speed or high-current RF outputs beneath the package where coupling or return-current discontinuity could degrade PLL behavior. The supplied data confirms a 28-QFN exposed-pad package but does not provide the recommended land pattern or pin assignments.
Power the device from a clean 2.7 V to 3.6 V rail and decouple close to the package using the capacitance values specified by the manufacturer. Because VCO phase noise can be influenced by supply ripple and reference jitter, verify the rail under worst-case load and keep switching-regulator harmonics away from the reference and RF paths. Do not infer the required capacitor values or supply-current headroom from the distributor summaries; obtain those figures from the official datasheet.
Do not substitute an Si41xx family member based only on its similar 28-QFN package and ordering pattern. The supplied cross-reference data explicitly supports SI4122-D-GM, while the other listed family candidates remain LLM-sourced same-family possibilities. Before substitution, compare every numbered lead, exposed-pad connection, supply limit, VCO band, prescaler ratio, loop-filter pin, programming interface, and register behavior. A package match alone does not establish drop-in equivalence.
Validate the reference, control, and RF output paths with the final PCB rather than relying only on simulation. Use a low-noise reference source, keep the loop-filter layout compact, and observe manufacturer grounding guidance so reference currents do not share a noisy return path with RF outputs. Measure phase noise, lock time, spurs, and output level across temperature before production. Exact acceptance limits were not included in the verified data and must be established from the datasheet and system requirements.
Compliance-Informationen
RoHS compliance is explicitly stated by the verified FindIC result. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was supplied. AEC-Q100 is marked not_applicable because this is an RF clock-and-timing IC rather than an automotive-qualified device.
