SI4136-BM
SI4136-BM - 2.5 GHz RF Synthesizer | Silicon Labs | Wireless
Silicon Labs SI4136-BM is an integrated RF frequency synthesizer IC with a maximum operating frequency of 2.5 GHz, a 2.7 V to 3.6 V supply range, and a 28-VFQFN exposed-pad surface-mount package. Designed for wireless communications, the device combines three VCOs, loop filters, reference and VCO dividers, and phase detectors in one monolithic component. Its programmable divider and powerdown settings are controlled through a three-wire serial interface, reducing external RF infrastructure while supporting IF and RF synthesis.
A frequency synthesizer is a clock-and-timing device that generates, multiplies, divides, and locks a reference signal to a selected output frequency. The SI4136 belongs to the PLL frequency-synthesizer and RF-synthesizer hierarchy, where a phase-locked loop steers an oscillator to maintain a controlled relationship between a stable reference and an RF output. This makes the device relevant to wireless transceivers, RF modems, frequency-agile communications equipment, and embedded RF systems rather than ordinary low-frequency clock distribution.
The SI4136-BM combines three integrated VCOs with programmable dividers and phase detectors. This architecture allows the synthesizer to cover multiple RF conversion paths while centralizing frequency planning in a serial-programmable device. The verified component data identifies PLL operation, crystal input, clock output, one circuit, and support for divider and multiplier functions. The three-wire serial programming interface is important because it reduces the number of discrete control connections required by the system.
The SI4136-BM is specified for a maximum frequency of 2.5 GHz and an operating supply range of 2.7 V to 3.6 V, making it suitable for compact RF systems whose supply architecture is already designed around low-voltage semiconductor rails. Its exposed pad provides a thermal and electrical connection to the PCB, but the required thermal-management details and exact pad-layout guidance must be taken from the manufacturer datasheet before layout release. The 28-VFQFN footprint is a surface-mount package intended for manufacturing reflow and automated assembly.
Typical applications include wireless communication modules, RF front-end supporting ICs, IF/RF conversion chains, and industrial or consumer products requiring programmable frequency generation. In these systems, the synthesizer establishes a stable RF or intermediate-frequency reference while the surrounding transceiver handles signal mixing, modulation, filtering, and power amplification. Integration can reduce board area and assembly complexity, although system designers must still verify reference-noise requirements, loop-filter settings, startup behavior, and regulatory output requirements.
Designers should preserve the exposed-pad copper connection, place supporting components according to the manufacturer’s reference layout, and keep sensitive RF and reference traces away from noisy switching nodes. Because the verified data does not provide the complete pin-level electrical table, pin names, oscillator tuning range, reference frequency, divider ratios, output characteristics, or recommended loop-filter values, those parameters require confirmation in the official datasheet. This page combines the verified product identity, package, supply, frequency, and sourcing information with practical design guidance without filling unavailable values with assumptions.
This product-data summary distinguishes SI4136-BM from ordinary fixed-frequency oscillators by emphasizing its integrated VCOs, dividers, phase detectors, loop filters, and serial programming. For procurement, verify current manufacturer identity and lifecycle status with an authorized distributor because search results reference both Silicon Labs and Skyworks Solutions, and confirm the exact package, temperature range, and electrical configuration against the latest manufacturer documentation.
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