MK2771-15RLF - 100MHz VCXO Clock Source | Renesas
MPN: MK2771-15RLF ✓ نشطMK2771-15RLF نظرة عامة
A VCXO is a crystal oscillator whose frequency can be adjusted with an external control voltage. This feedback-control function belongs to the broader clock-generator hierarchy, which includes oscillators, phase-locked loops, frequency synthesizers, clock buffers, and timing-control devices. Such devices establish the timing reference for processors, communications equipment, consumer receivers, and other digital systems that must coordinate data transfer or synchronize multiple internal circuits.
The MK2771-15RLF combines a crystal reference with voltage-controlled frequency adjustment and clock-generation circuitry. Its control input spans 0 V to 3 V, while the available tuning range is ±100 ppm. This allows a system controller to compensate for long-term crystal drift, board-to-board variation, and changes in operating temperature. A 100 MHz nominal output provides a high-frequency reference for downstream clock-generation or timing circuitry without requiring the external system to use a high-performance discrete oscillator arrangement.
The 4.75 V to 5.25 V operating range supports conventional 5 V clock-generation infrastructure. Because this is a controlled clock source rather than a general-purpose low-power timer, the design must account for its supply requirements, output load conditions, control-voltage sensitivity, and the thermal environment around the crystal and package. Decoupling close to the supply pins is especially important when the generated clocks feed sensitive digital, communications, or signal-processing circuitry.
Typical uses include set-top box main clock generation, digital video receiver timing, communications equipment, embedded multimedia systems, and other platforms requiring a voltage-trimmed 100 MHz reference. The tuning interface can be driven by a DAC, a filtered control loop, or a dedicated clock-control circuit when exact frequency alignment is needed. The device is especially relevant where fixed-frequency oscillator accuracy alone cannot compensate for environmental or production variations.
When laying out a board around the MK2771-15RLF, route the supply and ground connections directly to the relevant pins, place the decoupling capacitor at the same end of the PCB, and keep the voltage-control path away from high-current switching nodes. Confirm the output-drive and loading requirements against the manufacturer pin and electrical-characteristics tables before finalizing buffer or fan-out stages.
This page combines the confirmed device specifications, application guidance, pin-location resources, and engineering considerations needed to evaluate the MK2771-15RLF for a new 100 MHz clock-source design.
بدائل مباشرة لـ MK2771-15RLF — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
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اطلب بدائلMK2771-15RLF المواصفات
| Device Type | VCXO and clock synthesizer |
| Nominal Output Frequency | 100 MHz |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Voltage Control Input Range | 0 V to 3 V |
| Frequency Tuning Range | ±100 ppm |
| Package Type | 28-pin SSOP |
| Package Width | 3.90 mm (0.154 inch) |
| نوع التركيب | Surface mount |
| Packaging Type | Tube |
دليل تكوين أطراف MK2771-15RLF 3.90 mm (0.154 inch)
تكوين الأطراف لـ MK2771-15RLF (حزمة 3.90 mm (0.154 inch)). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
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التطبيقات النموذجية
MK2771-15RLF مناسب لـ 6 التطبيقs: Set-Top Box Main Clock, Digital Video Receiver Timing, Communications Equipment Reference Clock, Embedded Multimedia Platform, Clock Distribution System, Industrial Control Module.
Set-Top Box Main Clock
The MK2771-15RLF is suited to the main timing reference of a set-top box because it combines a 100 MHz crystal-based source with a 0 V to 3 V voltage-control input and a documented tuning range of ±100 ppm. The control voltage can be adjusted by a system controller to compensate for crystal aging, temperature drift, or production variation. Its 4.75 V to 5.25 V supply requirement fits a conventional 5 V clock architecture, while the 28-pin SSOP supports compact, surface-mount receiver designs.
موصى به
Digital Video Receiver Timing
A digital video receiver can use the MK2771-15RLF as a voltage-trimmed 100 MHz reference when multiple internal domains require a stable clock relationship. The ±100 ppm adjustment range allows a supervisory loop to correct long-term frequency drift without replacing the crystal assembly. Place a dedicated supply bypass capacitor near the device and route the control trace away from high-current switching stages, because power and control noise can otherwise appear as unintended clock modulation.
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Communications Equipment Reference Clock
The MK2771-15RLF can provide a trimmable 100 MHz reference in communications equipment that derives multiple internal or downstream clocks from a common source. Voltage-controlled tuning permits calibration against a more accurate system reference and supports compensation for temperature-dependent crystal changes. The implementation should preserve a quiet 5 V supply, minimize control-trace coupling, and verify the output loading and jitter requirements of every downstream clock domain before release to production.
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Embedded Multimedia Platform
Embedded multimedia systems can use the MK2771-15RLF as a frequency-correctable 100 MHz timing source for video processing, control logic, and communications blocks. Because the VCXO tuning range is ±100 ppm, the host controller can maintain alignment with another clock domain or apply periodic calibration. The device should be placed near the clock-consuming circuitry, with its supply return connected to a low-impedance ground plane and its control input protected from switching-node interference.
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Clock Distribution System
The MK2771-15RLF can act as the upstream reference for a clock-distribution network when the system requires a common, adjustable 100 MHz source rather than several independent oscillators. A trimmed reference reduces long-term frequency disagreement between distribution branches. Keep the VCXO close to the first buffer or distribution stage, preserve a continuous return path, and follow the manufacturer output-loading requirements so that clock edges and amplitude remain predictable across the fan-out network.
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Industrial Control Module
An industrial control module can use the MK2771-15RLF when precise coordination is needed between processors, communications interfaces, and data-conversion circuits. The external tuning capability allows calibration to offset board-level or temperature-related frequency variation. For industrial deployment, verify the device's rated operating-temperature limits against the enclosure environment and isolate the control input from motors, relays, power converters, and other sources of large transient currents.
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ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ MK2771-15RLF — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Brand | Renesas Electronics |
| Package | 28-pin SSOP |
| Device Type | VCXO and clock synthesizer |
| Nominal Output Frequency | 100 MHz |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Voltage Control Input Range | 0 V to 3 V |
| Frequency Tuning Range | ±100 ppm |
| Mounting Type | Surface mount |
| Packaging Type | Tube |
أبرز الفروقات
- Integrated voltage-based frequency correction (مقابلFixed-frequency oscillator alternatives)
- Purpose-built 100 MHz clock-source device (مقابلGeneral-purpose oscillator alternatives)
- Conventional 5 V operating range (مقابلLower-voltage clock-generator alternatives)
ملاحظات التصميم
Route the 5 V supply, ground, and voltage-control paths directly to the MK2771-15RLF pins, and place the supply bypass capacitor at the same end of the PCB. Keep the VCXO control trace away from switching nodes, relay drivers, and high-current power inductors. Because the control input tunes the clock, coupling from these sources can become frequency modulation rather than merely a separate analog-noise problem.
Use a stable 4.75 V to 5.25 V source and verify the regulator's ability to support the device's operating current plus downstream clock loads. Place a local bypass capacitor at the supply pins and provide a low-impedance ground return. Do not assume that the operating supply range alone guarantees acceptable clock amplitude; confirm output levels, load limits, and rise-time behavior from the manufacturer electrical-characteristics tables.
Do not apply a control voltage outside the documented 0 V to 3 V range, and do not treat the control input as a logic enable. If automatic frequency control is used, establish the loop gain and settling behavior before calibration. Also avoid substituting another MK2771 variant solely because its description mentions set-top clock generation; verify the exact pinout, frequency, supply range, control range, and package dimensions.
Preserve a continuous clock path from the oscillator to the first receiver and minimize stub lengths, especially when the output drives a divider, buffer, or long trace. Confirm the permitted capacitive and resistive loading before adding fan-out stages. If the clock feeds sensitive timing circuits, keep adjacent switching traces away from the clock and control nets to reduce edge corruption and unintended phase variation.
معلومات الامتثال
The manufacturer documentation confirms the device category, clock frequency, voltage ranges, package, and intended application. Specific RoHS, REACH, lead-free, halogen-free, and conflict-minerals declarations were not identified for the exact ordering code.
