MK2771-16RLF 50MHz VCXO Set-Top Clock | Renesas
N.º da peça: MK2771-16RLF ✗ Fim de vidaMK2771-16RLF Visão geral
A voltage-controlled crystal oscillator, or VCXO, is a crystal oscillator whose output frequency can be adjusted with an external control voltage. This places the component in the clock and timing IC category, within oscillator and clock-generation ICs used to establish stable timing references for digital processing, modulation, and signal-chain systems. Unlike a fixed-frequency oscillator, a VCXO allows a circuit to compensate for manufacturing tolerances, temperature drift, and synchronization errors.
The MK2771-16 is designed for set-top box clock-source applications. According to the manufacturer datasheet, its on-chip Voltage Controlled Crystal Oscillator accepts a control input from 0 V to 3 V, allowing the output clock to vary by up to plus or minus 100 ppm. The device operates from a 4.75 V to 5.25 V supply, supporting conventional 5 V equipment architectures. Its 28-pin surface-mount package is identified in product listings as 28-SSOP or 28-QSOP.
The MK2771-16 family uses a pullable crystal arrangement to provide voltage-controlled frequency adjustment. The datasheet specifically identifies a ground connection at pin 3 between the pullable crystal pins and directs that this ground to be routed directly from the right side beneath the device. This instruction is important because an incorrect crystal or ground routing can introduce instability or disturb the oscillator’s pull range.
Typical uses include digital set-top boxes, communications equipment, clock-generation subsystems, and other systems needing a locally adjustable 50 MHz timing reference. The control voltage can be produced by a DAC, PLL filter, or other phase-locked loop in a frequency-synchronization architecture. The architecture allows calibration to compensate for crystal tolerances while preserving a stable reference for downstream circuitry.
When laying out the design, place the crystal and its load network close to the oscillator inputs and follow the manufacturer’s pullable-crystal layout guidance. The control-voltage path should be kept short and isolated from noisy switching nodes, while supply bypassing should follow the capacitance and placement recommendations in the manufacturer datasheet. These measures protect phase noise and clock stability.
This page consolidates the confirmed electrical limits, package information, sourcing guidance, replacement constraints, and practical layout considerations for the MK2771-16RLF. It also identifies where an engineering decision requires a complete manufacturer datasheet review rather than an assumption based only on family naming or distributor metadata.
Alternativas drop-in para MK2771-16RLF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasMK2771-16RLF Especificações
| Device Type | VCXO and set-top clock source |
| Nominal Output Frequency | 50 MHz |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Control Voltage Range | 0 V to 3 V |
| Frequency Adjustment Range | plus or minus 100 ppm |
| Oscillator Architecture | On-chip voltage-controlled crystal oscillator |
| Encapsulamento | 28-pin QSOP, 0.154 inch by 3.90 mm width |
| Tipo de montagem | Surface mount |
| Shipping Format for RLF | Tube |
| Ground Pin in Crystal Interface | Pin 3 |
| Crystal Layout Requirement | Application Note MAN05 |
| Status RoHS | Compliant |
| Lead-Free Status | Lead free |
Guia de Configuração de Pinos do MK2771-16RLF 28-pin qsop, 0.154 inch by 3.90 mm width
Configuração de pinos para MK2771-16RLF (pacote 28-pin qsop, 0.154 inch by 3.90 mm width). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para MK2771-16RLF.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
MK2771-16RLF é adequado para 6 aplicaçãos: Digital Set-Top Box Clock Source, Communications Equipment Frequency Reference, Phase-Locked Loop Calibration, Digital Processing Timing Reference, Consumer Receiver Timing, Industrial Instrumentation Reference Clock.
Digital Set-Top Box Clock Source
The MK2771-16RLF is designed for set-top box timing because it combines a 50 MHz VCXO with set-top clock-generation circuitry in a 28-pin QSOP package. Its 4.75 V to 5.25 V operating range fits conventional 5 V equipment, while the 0 V to 3 V control input provides up to plus or minus 100 ppm adjustment. A tuner, demodulator, or processor system can use this adjustable reference to compensate for crystal tolerance and improve synchronization. The pullable-crystal network and pin 3 ground route should follow the manufacturer’s Application Note MAN05 guidance.
Recomendado
Communications Equipment Frequency Reference
The MK2771-16RLF can provide an adjustable local reference in communications equipment that must reconcile crystal tolerances with an external timing source. Its nominal 50 MHz output is suited to digital signal-processing chains, while the control-voltage input allows calibration through a DAC, PLL filter, or timing controller. The plus or minus 100 ppm pull capability provides tuning margin without replacing the crystal oscillator architecture. Designers should preserve a quiet control path and route the pin 3 ground directly beneath the device as specified by the manufacturer datasheet.
Recomendado
Phase-Locked Loop Calibration
In a phase-locked loop calibration architecture, the MK2771-16RLF supplies a tunable crystal reference whose output can be shifted by the external 0 V to 3 V control voltage. This makes the device useful where a fixed crystal alone cannot meet the phase-error budget or acquisition requirement. Its 50 MHz nominal output can feed a divider or comparator stage, allowing fine calibration to occur without changing the crystal itself. The loop bandwidth, loop filter, and control-voltage noise must be engineered around the device’s documented pull behavior.
Recomendado
Digital Processing Timing Reference
The MK2771-16RLF can serve as the local timing reference for a digital processor, demodulator, or interface subsystem requiring an adjustable 50 MHz clock. Its VCXO architecture permits production calibration to compensate for component tolerance, reducing reliance on a fixed-output oscillator when the system can tune the control voltage. The 28-pin QSOP package supports compact surface-mount assembly, but the sensitive crystal section still needs careful layout. Keep supply and control paths separated from noisy switching nodes and follow the specified crystal-load network.
Recomendado
Consumer Receiver Timing
The MK2771-16RLF is appropriate for consumer receivers and tuner systems that need a stable yet calibratable clock reference. The 50 MHz nominal output provides a convenient timing foundation for digital demodulation, while the control input allows factory or startup calibration to compensate for crystal variation. Its 4.75 V to 5.25 V supply range supports established 5 V receiver architectures. Implementation should minimize loop area around the crystal, keep the control voltage clean, and verify temperature and aging performance against the complete manufacturer electrical-characteristics table.
Recomendado
Industrial Instrumentation Reference Clock
The MK2771-16RLF can support an instrumentation subsystem that requires a locally adjustable reference instead of an entirely fixed oscillator. Its plus or minus 100 ppm tuning capability permits alignment to an external measurement or synchronization signal, while the 50 MHz output can feed timing, sampling, or divider circuits. The device requires a stable 5 V supply and careful separation between sensitive oscillator routing and high-current switching stages. Production designs should verify phase noise, aging, startup behavior, and temperature stability against the full manufacturer datasheet.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MK2771-16RLF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto |
|---|---|
| Brand | Renesas Electronics |
| Package | 28-pin QSOP, 0.154 inch by 3.90 mm width |
| Device Type | VCXO and set-top clock source |
| Nominal Output Frequency | 50 MHz |
| Supply Voltage Range | 4.75 V to 5.25 V |
| Control Voltage Range | 0 V to 3 V |
| Frequency Adjustment Range | plus or minus 100 ppm |
| Shipping Format | Tube for RLF suffix |
| RoHS Status | Compliant |
| Lead-Free Status | Lead free |
Principais diferenciais
- Purpose-built adjustable set-top clock source (vs MK2771-15RLFTR)
- Defined pullable-crystal ground implementation (vs MK2771-16RLFTR)
- Tube shipping format for the exact RLF order code (vs MK2771-16RLFTR)
Notas de projeto
Follow Application Note MAN05 for the pullable crystal layout, with the MK2771-16 exception shown in the manufacturer datasheet. Pin 3 is a ground connection between the pullable crystal pins, and it must be brought in directly from the right side underneath the device. Place the crystal and prescribed load components close to their associated pins, minimize the oscillator-loop area, and keep switching-current paths away from this sensitive region.
Treat the 0 V to 3 V control input as a precision analog signal even though its voltage range is simple. Route it away from clocks, relay coils, switching-regulator nodes, and other high-edge-rate nets. If a DAC or PLL filter drives the control voltage, preserve a clean return path and evaluate control-line noise because modulation of the tuning input can appear directly as clock phase noise or timing jitter.
Use a stable 4.75 V to 5.25 V supply and place the manufacturer-recommended bypass capacitors close to the supply pins. Keep the input and ground planes continuous beneath the device where the package and layout guidance permit. Confirm the actual supply-current limit, startup behavior, and decoupling requirements in the manufacturer electrical-characteristics and application sections before committing the power tree.
Do not treat a related suffix or family member as a drop-in replacement without verification. MK2771-16RLFTR changes the shipping presentation, while MK2771-15RLFTR is a different family member and the available comparison does not prove identical electrical or pin behavior. For any substitution, compare frequency, pull range, control polarity, crystal topology, jitter, supply limits, pin assignment, and package dimensions.
Informações de conformidade
The verified component comparison identifies the MK2771-16RLF as RoHS compliant and lead free. No definitive REACH, halogen-free, conflict-minerals, or automotive-qualification declaration appears in the verified product records.
