MK2705STR - MPEG Audio Clock Synthesizer | Renesas
料号： MK2705STR ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MK2705STR 概述
A clock synthesizer is a clock-and-timing integrated circuit that creates, distributes, or translates timing signals for another circuit. In an MPEG audio system, the synthesizer derives the sampling rate required by an audio decoder or interface. This clock-generation function sits within the broader timing hierarchy of a PLL, clock generator, clock and timing IC, and ultimately system clock infrastructure. The MK2705 supports both stream-derived operation and standalone operation, allowing a design to cover multiple source conditions.
The verified feature set emphasizes integration rather than a broad set of published numeric ratings. It includes PLL capability, one clock circuit, clock or crystal input, clock output, and an input-to-output ratio of 1:1. Search results identify the primary use as MPEG audio, while the 27 MHz crystal mode provides a reference for designs that do not require an MPEG-derived source. These details make the device directly relevant to audio sampling-clock generation rather than general-purpose distribution.
The MK2705STR belongs to the clock-and-timing hierarchy and is listed as an audio clock source in distributor results. That classification distinguishes it from oscillators, microcontrollers, and ordinary fixed-function logic. A PLL can phase-lock and derive a stable output frequency from a source, while the integrated clock output routes the generated timing signal within the audio subsystem. The supplied evidence does not provide verified operating voltage, frequency range, jitter, phase-noise, or power-consumption figures, so these values must be confirmed in the Renesas datasheet before production design.
Typical uses include MPEG audio decoder boards, digital audio sampling-clock generation, multimedia clock trees, and systems where a 27 MHz crystal reference is available. In an MPEG-derived architecture, the device reduces the need for separate clock-generation logic. In standalone mode, it provides a controlled clock path from the specified crystal source. Designers should still evaluate startup time, lock behavior, output format, and signal integrity against the exact system timing requirements.
The main design consideration is source and package verification. Confirm the exact pin mapping, supply requirements, crystal network, output enable behavior, and decoupling recommendations in the official Renesas MK2705 datasheet. Because the supplied web data does not include those detailed values, the appropriate engineering approach is to treat them as required design inputs rather than inferred specifications.
This page consolidates verified distributor and manufacturer information, distinguishes confirmed facts from missing parameters, and provides practical application guidance for engineers evaluating the MK2705STR.
直接替换替代料： MK2705STR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MK2705STR （相同外形与封装尺寸） ——差异在于 Product Type, Package, Input-to-Output Ratio, PLL.
快速对比工具——选择替代料号进行并排对比：
MK2705SLF
✅ 直接替换✓ 有现货
$3.6413 / 个
查看数据手册 →MK2704S
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →MK2705S
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →MK2705STR
✅ 直接替换✓ 有现货
联系询价
查看数据手册 →MK2705
✅ 直接替换📋 参考替代料（不在目录中）
MK2705STR 规格参数
| Product Type | Clock/Frequency Synthesizer |
| Primary Purpose | Audio, MPEG |
| PLL | Yes |
| Main Function | Synchronous clock generation for audio sampling rates derived from an MPEG stream |
| Standalone Clock Mode | 27 MHz crystal input |
| Number of Circuits | 1 |
| Input Type | Clock, Crystal |
| 输出类型 | Clock |
| Input-to-Output Ratio | 1:1 |
| 封装 | 8-pin SOIC |
MK2705STR 8-pin soic 引脚配置指南
MK2705STR（8-pin soic 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MK2705STR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MK2705STR 适用于 6 应用s: MPEG Audio Decoder Clocking, Digital Audio Sampling-Clock Generation, Multimedia and MPEG Player Timing, Standalone 27 MHz Crystal Clock Reference, Consumer Audio Interface Timing, Synchronous MPEG Audio Subsystem.
MPEG Audio Decoder Clocking
The MK2705STR is a strong fit for MPEG audio decoder clocking because its verified purpose is synchronous generation of audio sampling-clock rates from an MPEG stream, and it includes an integrated PLL. In this architecture, the device accepts a clock or crystal input and supplies a clock output to the decoder timing section. The 1:1 input-output ratio should be checked against the exact decoder interface, while the absence of verified jitter and phase-noise figures means the system designer must review the Renesas datasheet before setting audio-quality margins. Its single-circuit 8-pin SOIC implementation also reduces the clock-tree footprint compared with a discrete solution.
推荐
Digital Audio Sampling-Clock Generation
For digital audio products, the MK2705STR can provide a dedicated sampling-clock path instead of deriving timing independently throughout the signal chain. Its verified clock output, PLL capability, and MPEG/audio classification align with systems that require stable sampling timing for converters or digital-audio processing. The device is particularly relevant when the design can accept an 8-pin SOIC clock component and needs either MPEG-derived generation or local crystal-based operation. The designer should confirm output frequency, polarity, jitter, and supply requirements from the official datasheet before treating the clock as suitable for a specified audio sample rate.
推荐
Multimedia and MPEG Player Timing
The MK2705STR is suited to multimedia-player timing blocks where an MPEG stream determines the audio sampling-clock requirement. By integrating synchronous clock generation and a PLL in one device, it can simplify the relationship between the MPEG timing source and downstream audio circuitry. The verified 1:1 ratio is a useful starting constraint, but it must be reconciled with the system’s actual clock tree and divider architecture. For production designs, compare the MK2705STR startup and lock requirements with the player’s display, storage, and audio startup sequence, and verify all missing electrical and timing limits from the manufacturer documentation.
推荐
Standalone 27 MHz Crystal Clock Reference
The MK2705STR can operate as a standalone clock source using a 27 MHz crystal, which is useful when a product needs a local timing reference without relying on a continuously available MPEG-derived source. In this configuration, the crystal and associated passive network become critical design elements; their values and stability requirements are not provided in the verified search data and must come from the Renesas datasheet. The integrated single-circuit structure can reduce discrete component count, but the design must still verify startup, frequency tolerance, load capacitance, output waveform, and supply decoupling.
推荐
Consumer Audio Interface Timing
In consumer audio interfaces, a centralized clock synthesizer can reduce repeated clock generation and provide a defined source for sampling and conversion blocks. The MK2705STR’s verified audio/MPEG purpose, clock input, clock output, and PLL make it relevant to compact audio products with an MPEG-oriented signal source. Its 8-pin SOIC package supports conventional surface-mount assembly, although the exact exposed-pad or thermal arrangement must be confirmed from the package drawing. Engineers should check supply voltage, startup sequence, output drive, and audio jitter tolerance before integrating it with converters or digital filters.
推荐
Synchronous MPEG Audio Subsystem
The MK2705STR can serve as the timing element in a synchronous MPEG audio subsystem where a common reference must be distributed to sampling and processing blocks. Its integrated PLL provides the functional basis for deriving a required clock from the supplied source, while the clock output provides a dedicated route into the next timing domain. The verified 1:1 input-output ratio is important because it can simplify system planning when the source clock is already suitable. However, the supplied evidence does not state lock time, jitter, phase noise, or output frequency limits, so those values must be validated before deployment in high-performance audio equipment.
推荐
推荐产品汇总
工程参考数据： MK2705STR ——对比、设计指导和合规信息。
选型指南
关键差异点
- Supports both MPEG-derived and 27 MHz crystal clock modes （对比 MK2704S)
- Integrated PLL in a compact 8-pin SOIC （对比 MK2705SLF)
- Clear MPEG/audio positioning （对比 MK2704S)
设计说明
Place the MK2705STR close to the clock source and the circuit receiving its clock output. Keep the clock path short and maintain a continuous ground reference; excessive trace length, stubs, and vias can degrade clock quality even when the nominal frequency is correct. Because the verified data confirms an 8-pin SOIC package but does not provide the pinout, route the PCB only after checking the official Renesas pin drawing.
Follow the manufacturer’s recommended supply and decoupling arrangement for the MK2705STR. The supplied search data does not specify operating voltage, current, or bypass capacitor values, so do not infer these from the 27 MHz crystal or MPEG-clock description. Confirm the power rails and capacitor tolerances in the official datasheet, then verify startup and steady-state operation with an oscilloscope and a representative MPEG clock source.
Evaluate clock amplitude, edge quality, jitter, and loading at the receiver rather than assuming that the nominal clock output is sufficient. The verified material identifies a clock output and PLL but does not publish the corresponding jitter or phase-noise limits. In a digital-audio design, measure the output across the intended source, trace, termination, and load conditions, and leave timing margin for the downstream converter or decoder.
Do not substitute a part based only on the MK2705 family name or a generic clock-generator classification. A valid drop-in replacement requires the exact 8-pin SOIC footprint, identical pin functions, compatible supply requirements, and equivalent timing behavior. The available cross-reference results mention MK2705SLF and MK2704S but do not establish those conditions, so validate both datasheets and mechanical drawings before substitution.
合规信息
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Confirm current compliance and qualification documentation with Renesas or the authorized distributor.