MK2771-15R - 100MHz VCXO Clock Synthesizer | Renesas
MPN: MK2771-15R ✓ פעילMK2771-15R סקירה
A VCXO is a crystal oscillator whose frequency can be adjusted with an external control voltage. It belongs to the clock oscillator and timing-control hierarchy, where a stable crystal reference is combined with voltage-controlled tuning to compensate for reference-clock errors. A clock synthesizer performs the related function of generating or distributing multiple timing signals. The MK2771-15R integrates these concepts for consumer set-top equipment where adjustable, low-jitter timing is useful without requiring a high-cost external frequency-control solution.
Key features include a maximum clock frequency of 100 MHz, a VCXO tuning range of ±100 ppm, a 0 V to 3 V control-voltage range, low-cost implementation, and low-jitter operation. The CMOS output architecture is suitable for digital logic in set-top boxes, while the 1:8 ratio provides a defined relationship between the crystal input and synthesized output. These characteristics make the device relevant to designs requiring a tunable reference clock rather than a completely fixed-frequency oscillator.
Technically, the MK2771-15R combines a crystal-based oscillator, voltage-controlled frequency adjustment, and clock-synthesis functions on one integrated circuit. The control voltage applied to the VCXO changes the output frequency around the crystal-defined nominal condition. Its single-circuit implementation simplifies PCB requirements compared with a discrete crystal oscillator plus separate synthesizer. The available data specifies CMOS outputs, a crystal input, and single-ended rather than differential signaling, so downstream circuitry must be designed for the corresponding signal format.
Typical uses include set-top box main timing, tuner and video-processing clock distribution, MPEG transport-stream interface clocking, and other consumer television equipment requiring a tunable low-jitter clock source. The device can also serve as a dedicated timing IC in designs where its 100 MHz ceiling and ±100 ppm adjustment capability satisfy the system clock requirements.
Designers should verify the exact crystal frequency, loop filtering, output enable behavior, decoupling requirements, and output-drive configuration against the manufacturer datasheet before layout release. The 28-QSOP footprint requires a compact surface-mount layout, while the single-ended CMOS outputs require controlled routing and return paths to minimize clock-edge degradation.
This page consolidates the verified manufacturer and distributor information, distinguishes documented parameters from unavailable details, and provides application guidance, purchasing context, and design cautions without presenting unverified specifications as fact.
חלופות תחליף ישיר עבור MK2771-15R — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
אין חלופות תואמות Drop-in עבור מוצר זה.
בקשת חלופותMK2771-15R מפרטים
| Product Type | VCXO and clock synthesizer |
| Primary Application | Set-top boxes |
| Maximum Output Frequency | 100 MHz |
| VCXO Control Voltage Range | 0 V to 3 V |
| Frequency Tuning Range | ±100 ppm |
| Output Logic | CMOS |
| Clock Input | Crystal |
| PLL | Yes |
| Number of Circuits | 1 circuit |
| Input-to-Output Ratio | 1:8 |
| Differential Input | No |
| Differential Output | No |
| מארז | 28-QSOP, 0.154 inch (3.90 mm) width |
| Jitter | Low |
| Cost Position | Low-cost device |
מדריך תצורת פינים של MK2771-15R 28-qsop, 0.154 inch (3.90 mm) width
תצורת פינים עבור MK2771-15R (מארזת 28-qsop, 0.154 inch (3.90 mm) width). מספרי פינים, פונקציות ותרשימי חיבורים מוגדרים ב-Datasheet של היצרן. יש לעיין בו לקבלת ה-footprint המדויק והנחיות הלחמה.
אין נתוני פריסת פינים מפורטים עבור MK2771-15R.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
MK2771-15R מתאים עבור 6 יישוםs: Set-Top Box Main Clock, Tuner and Demodulator Timing, MPEG Transport-Stream Clocking, Consumer Video Processing, Low-Cost Tunable Clock Reference, Digital Television Receiver Timing.
Set-Top Box Main Clock
The MK2771-15R is specifically designed for set-top boxes and combines a voltage-controlled crystal oscillator with clock synthesis in one 28-QSOP IC. Its maximum output frequency of 100 MHz and ±100 ppm tuning range suit systems that need a reference clock capable of limited adjustment. The device generates single-ended CMOS clock outputs, reduces the need for a discrete oscillator and separate synthesis stage, and supports a 1:8 input-to-output ratio. Designers must select the crystal and PLL settings according to the manufacturer guidance, while controlling return paths and output loading to preserve jitter performance.
מומלץ
Tuner and Demodulator Timing
The MK2771-15R can supply a tunable CMOS timing reference to tuner, demodulator, and transport-stream processing sections of a set-top box. Its 0 V to 3 V VCXO control input permits up to ±100 ppm clock adjustment, which is useful when correcting small reference offsets without changing the crystal itself. The 100 MHz maximum frequency provides headroom for common digital video-processing clock domains. Integration reduces component count, but the clock architecture and PLL settings must be validated against the receiver subsystem’s sampling requirements and jitter tolerance.
מומלץ
MPEG Transport-Stream Clocking
The MK2771-15R is applicable as a system clock source for MPEG transport-stream processing, where consistent digital timing supports serialized data transfer and synchronization. Its integrated VCXO and clock synthesizer provide a single-ended CMOS output with a documented maximum frequency of 100 MHz and a 1:8 input-to-output ratio. Using the IC can simplify the clock tree compared with separate oscillator and synthesis components. The actual transport-stream interface should be evaluated for required frequency, jitter, and PLL-loop bandwidth, and the control voltage must be filtered to avoid unwanted modulation.
מומלץ
Consumer Video Processing
The MK2771-15R can serve as a reference clock for consumer television and video-processing electronics that operate from a crystal-defined source but benefit from voltage adjustment. Its 100 MHz ceiling, PLL capability, and ±100 ppm tuning range offer more flexibility than a fixed oscillator while maintaining a low-cost integration approach. The CMOS output is compatible with conventional digital timing distribution when signal integrity is managed correctly. Designers should confirm whether the target video IC expects a specific clock multiple, edge polarity, and jitter level before committing the circuit.
מומלץ
Low-Cost Tunable Clock Reference
The MK2771-15R is useful where modest frequency adjustment is needed but a high-cost programmable clock source would be excessive. Applying a control voltage from 0 V to 3 V changes the output by up to ±100 ppm, allowing small system-level corrections while the crystal maintains the nominal reference. The integrated PLL and clock synthesizer provide additional timing functions in the same 28-QSOP device. This approach is most appropriate when the required tuning range is narrow and the control signal can be kept clean, because voltage noise or poor filtering may degrade the resulting clock quality.
מומלץ
Digital Television Receiver Timing
The MK2771-15R was developed for set-top-box environments and can provide the system timing reference used by digital television receiver chains. Its low-jitter VCXO architecture, 100 MHz maximum output, and 0 V to 3 V tuning control are appropriate for systems requiring a stable but adjustable clock source. The single-ended CMOS output makes it usable with compatible digital logic, provided the PCB layout maintains short return paths and controlled impedance. Receiver designers should verify jitter against the demodulator and video timing specifications rather than relying only on frequency accuracy.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MK2771-15R — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה |
|---|---|
| Package | 28-QSOP, 0.154 inch (3.90 mm) width |
| Brand | Renesas Electronics |
| Product Type | VCXO and clock synthesizer |
| Maximum Output Frequency | 100 MHz |
| VCXO Control Voltage Range | 0 V to 3 V |
| Frequency Tuning Range | ±100 ppm |
| Output Logic | CMOS |
| Clock Input | Crystal |
| Input-to-Output Ratio | 1:8 |
| PLL | Yes |
מבדילים עיקריים
- Integrated voltage adjustment and clock synthesis (לעומתFixed-frequency crystal oscillator)
- Designed specifically for set-top-box timing (לעומתGeneral-purpose clock oscillator)
- Single-chip clock-tree simplification (לעומתDiscrete crystal oscillator plus external synthesizer)
הערות תכנון
Place the crystal, associated load components, and device clock pins using the manufacturer’s reference layout. The available evidence confirms a 28-QSOP package and crystal input but does not provide a verified pin map, so the complete datasheet must be consulted before routing. Keep clock traces short, provide a continuous ground reference, and avoid routing the sensitive crystal node beneath digital or switching-clock traces to reduce pickup and phase-noise conversion.
The verified 0 V to 3 V specification applies to the VCXO control input and must not be mistaken for the complete device supply-voltage range. Use the manufacturer’s recommended supply, decoupling, and control-voltage circuit values. In particular, filter the VCXO control voltage when it originates from a DAC or digitally controlled source, because control-signal noise can modulate clock frequency and degrade jitter. The required supply-voltage and decoupling values remain unavailable in the supplied data.
Route each single-ended CMOS clock output with a continuous reference plane, minimize stub lengths, and match the receiver’s input expectations. The verified specifications identify CMOS outputs but do not provide drive strength, rise time, or capacitive-load limits. Confirm those electrical characteristics in the datasheet before assuming a particular trace length or topology, and evaluate edge degradation at the 100 MHz maximum output frequency rather than only at the nominal operating point.
Do not treat the ±100 ppm VCXO range as a general-purpose PLL programming range, and do not substitute a suffix variant without verifying pin compatibility. The cross-reference results identify MK2771-15RLF as physically related to the family but do not establish equivalence. Validate crystal frequency, PLL ratio, control polarity, output configuration, and lifecycle status. A clock oscillator that powers incorrectly can prevent system start-up even when basic output frequency measurements appear correct.
מידע על תאימות
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals compliance. AEC-Q100 is treated as not applicable because this is a set-top-box clock-generation IC rather than an automotive-qualified device.
