SI5391P-A-GM - Ultra-Low Jitter 12-Output Clock Generator
Артикул: SI5391P-A-GM ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.4 | $164,00 |
| 100 | $14.85 | $1.485,00 |
| 500 | $13.6 | $6.800,00 |
| 1.000 | $12.75 | $12.750,00 |
SI5391P-A-GM Обзор
A clock generator is a frequency-synthesis component that produces one or more precisely controlled timing references from a single input reference. Clock generators occupy the timing hierarchy above quartz crystals (which provide only a single fixed frequency) and below PLLs that lock to external references. The SI5391P belongs to the broader family of programmable clock generators that internalize MultiSynth fractional-divider technology to generate "any-frequency, any-output" combinations, eliminating discrete oscillator inventory in complex multi-rail designs.
Key features of the SI5391P-A-GM include a 48 MHz crystal reference input, support for three independent clock domains, I2C/SPI serial configuration with non-volatile memory for default configuration restore, and precision calibration that linearizes the internal MultiSynth to achieve 95 fs maximum phase jitter across the supported frequency plan. Each output can be independently set to LVPECL, LVDS, HCSL, CMOS, or SSTL levels through software, allowing one part to replace multiple discrete XOs in PCB layout.
Architecturally, the device combines a low-noise PLL, four MultiSynth fractional dividers, and per-output level translators. The MultiSynth architecture achieves 0 ppm frequency synthesis error while maintaining sub-100 fs RMS jitter, which directly translates to bit-error-rate improvements in 100G/400G optical transceivers and to ENOB headroom in high-speed ADCs. The 1 GHz internal VCO is divided down through MultiSynth blocks rather than traditional sigma-delta modulators, avoiding spurs in sensitive spectrum windows.
Typical applications include 100G/400G Ethernet PHY line cards, OTU4 long-haul optical module reference clocks, FPGA and ASIC fabric clocks, JESD204B/C SerDes reference generation for high-speed data converters, wireless base-station timing distribution, and broadcast video reference generation. Its low intrinsic jitter makes it suitable as a master clock for RF DACs and ADCs where aperture jitter limits signal-to-noise ratio at IF frequencies above 1 GHz.
When designing with the SI5391P, ensure the AC-coupling capacitor network on each differential output matches the 100-ohm termination scheme and that the PCB layout keeps the 48 MHz crystal traces short and symmetric. Decoupling the AVDD pins with both bulk and high-frequency ceramic capacitors within 2 mm of the exposed pad is critical to achieving datasheet jitter specifications.
Аналоги без доработки для SI5391P-A-GM — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
SI5391P-A09580-GM
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI5391P-A10302-GM
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI5391P-A13082-GM
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI5391C-A-GMR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI5391B-A10865-GM
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI5391P-A-GM Характеристики
| Функция | Clock Generator IC |
| Количество выходов | 12 |
| Maximum Output Frequency | 312.5 MHz |
| RMS Phase Jitter (Typical) | 69 fs at 156.25 MHz |
| RMS Phase Jitter (Maximum) | 95 fs at 156.25 MHz and 312.5 MHz |
| Crystal Reference Frequency | 48 MHz |
| Number of Clock Domains | 3 (independent) |
| Calibration Grade | Precision Calibration (P-grade) |
| Output Logic Formats | LVPECL, LVDS, HCSL, CMOS, SSTL (software-selectable) |
| Number of Reference Inputs | 15 (max, includes XA/XB crystal pair) |
| Configuration Interface | I2C / SPI (selectable) |
| Configuration Memory | Internal non-volatile memory (NVM) |
| Корпус | 64-VFQFN Exposed Pad |
| Тип монтажа | Surface Mount |
| Диапазон рабочих температур | -40C to +85C (industrial) |
Руководство по цоколевке SI5391P-A-GM в корпусе 64-vfqfn exposed pad
Цоколевка для SI5391P-A-GM (корпус 64-vfqfn exposed pad). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для SI5391P-A-GM.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
SI5391P-A-GM подходит для 6 применениеs: 100G/400G Ethernet PHY Line-Card Timing, OTU4 Long-Haul Optical Module Reference, JESD204B/C Converter Reference Clock, Wireless Base Station Timing, FPGA/ASIC Transceiver Reference Clock, Broadcast Studio Video Reference.
100G/400G Ethernet PHY Line-Card Timing
On 100G and 400G Ethernet PHY line cards, the SI5391P-A-GM provides 156.25 MHz reference clocks with 69 fs RMS typical jitter - well inside the IEEE 802.3bm and OIF CEI-25G-LR jitter budget for 25G NRZ lanes. Placed near the QSFP28 cage retimer or the network processor's SERDES reference pins, it replaces up to 12 discrete oscillator XOs with one package. Per the Si5391 datasheet reference design, each LVPECL output is AC-coupled through a 100-ohm termination network; the low intrinsic jitter translates directly into improved link BER at line rates up to 25.78 Gbps per lane.
Рекомендуется
OTU4 Long-Haul Optical Module Reference
Inside OTU4 coherent optical modules, the SI5391P-A-GM supplies the local oscillator (LO) reference clocks at 156.25 MHz or 311.04 MHz for the I/Q modulator driver and the integrated tunable laser assembly. Its 69 fs jitter floor preserves phase-noise margins required for DP-QPSK and 16-QAM constellation decode. Per the Skyworks datasheet, the CMOS output stage can directly drive a DSP/CFP2-DCO clock pin, eliminating an external buffer. The exposed pad provides 36 C/W theta_JA, allowing dense modules without derating.
Рекомендуется
JESD204B/C Converter Reference Clock
The SI5391P-A-GM is designed as the device-clock and SYSREF generator for JESD204B/C analog-to-digital and digital-to-analog converters. Its 69 fs RMS jitter satisfies the JESD204B Subclass 1 deterministic-latency phase budget for up to 5 GSPS ADCs. The device outputs the SYSREF pulse train and per-converter device clock with deterministic phase alignment, supporting subclass 1 latency calibration. Each output can be independently set to LVDS or LVPECL; ClockBuilder Pro provides JESD204B template frequency plans for ADC-to-FPGA links.
Рекомендуется
Wireless Base Station Timing
In 4G/5G base-station radio units, the SI5391P-A-GM synthesizes the CPRI/eCPRI reference clocks at 122.88 MHz, 153.6 MHz, and 245.76 MHz, plus the system sync clock at 30.72 MHz for the baseband ASIC. Its 12 outputs cover the entire radio unit's clock tree from one device. Per the Si5391 datasheet, RMS jitter at 122.88 MHz is similar to the 156.25 MHz figure of 69 fs, preserving EVM and ACLR margins for LTE-A and 5G NR signals. The exposed pad keeps the package within thermal envelope at full output loading.
Рекомендуется
FPGA/ASIC Transceiver Reference Clock
The SI5391P-A-GM provides programmable reference clocks for Xilinx Ultrascale+/Versal and Intel Stratix-10/Agilex transceiver reference pins. Its software-selectable output formats (LVPECL, LVDS, HCSL, CMOS) drive every common FPGA REFCLK requirement. According to the Si5391 reference manual, the device's low jitter preserves GTX/GTH/GTY and F-Tile transceiver eye margins at 28 Gbps NRZ and 56 Gbps PAM4. Per-output independent frequency synthesis eliminates the need for multiple XO/VCXO parts in FPGA mezzanine cards.
Рекомендуется
Broadcast Studio Video Reference
In broadcast studio routers and 4K/8K video-processing equipment, the SI5391P-A-GM distributes 27 MHz, 74.25 MHz, and 148.5 MHz timing references with low phase noise so SMPTE ST 2059-2 and AES67 audio-over-IP synchronization stays inside spec. The P-grade calibration ensures that any-frequency pairings (e.g., video pixel clock plus audio word clock) hold low relative jitter under temperature. According to manufacturer data, the device's TTL/CMOS output option drives HDMI and SDI serializer reference pins directly.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для SI5391P-A-GM — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SI5391P-A09580-GM | SI5391P-A10302-GM | SI5391P-A13082-GM | SI5391C-A-GMR | SI5391B-A10865-GM |
|---|---|---|---|---|---|---|
| Package | 64-VFQFN Exposed Pad | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same |
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Maximum Output Frequency | 312.5 MHz | 312.5 MHz | 625 MHz | 312.5 MHz | 1028 MHz | 350 MHz |
| Number of Outputs | 12 | 12 | 12 | 12 | 12 | 12 |
| RMS Phase Jitter (Max) | 95 fs | 95 fs | 95 fs | 95 fs | 200 fs typical | 300 fs typical |
| Calibration Grade | P (Precision) | P (Precision) | P (Precision) | P (Precision) | C (Standard) | B (Standard) |
| Crystal Reference | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 750 MHz |
| Output Logic Formats | LVPECL/LVDS/HCSL/CMOS/SSTL | LVPECL/LVDS/HCSL/CMOS/SSTL | LVPECL/LVDS/HCSL/CMOS/SSTL | LVPECL/LVDS/HCSL/CMOS/SSTL | LVPECL/LVDS/HCSL/CMOS/SSTL | LVPECL/LVDS/HCSL/CMOS/SSTL |
| Configuration Interface | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI | I2C / SPI |
Ключевые отличия
- Calibrated for the 156.25/312.5 MHz Ethernet frequency plan (против SI5391C-A-GMR)
- Lower-output-frequency precision variant available (против SI5391P-A10302-GM)
- Same 12-output multi-format capability (против SI5391B-A10865-GM)
Заметки по проектированию
Per the Si5391 datasheet layout section, keep the 48 MHz crystal traces between the XA and XB pins and the crystal short (< 5 mm), symmetric, and surrounded by a ground pour. Place the load capacitors (per the crystal manufacturer's CL specification) as close to the XA/XB pins as possible. A continuous ground plane under the entire crystal area is mandatory to avoid coupled spurious noise that directly corrupts the PLL reference and degrades output jitter by tens of femtoseconds. Avoid routing any digital signal traces near the crystal traces or the AVDD pins.
Decouple each AVDD pin with a 10 uF bulk tantalum or ceramic capacitor within 2 mm of the pin, plus a 0.1 uF X7R ceramic bypass in parallel, per the Si5391 reference design. Use a ferrite bead in series with each AVDD rail to isolate the analog supply from any switching regulator that feeds the board. Estimated: at full 12-output switching load each AVDD pin draws approximately 80 mA, so the ferrite bead must be rated for at least 100 mA DC with low DCR (< 0.1 ohm) to avoid more than 10 mV of IR-drop ripple on the analog supply.
Do not substitute a 25 MHz or 40 MHz crystal at the XA/XB pins - the SI5391P family is calibrated only for 48 MHz and any other reference will cause output jitter to exceed 95 fs and may produce fractional spur tones in the output spectrum. Also, when AC-coupling LVPECL outputs the 100-ohm termination network should be referenced to VTT = VDD - 2 V, not to ground, to maintain DC bias at the Si5391 differential output stage. Finally, the exposed pad MUST be soldered to a continuous ground plane through at least 9 thermal vias for reliable operation at all 12 outputs.
Информация о соответствии
RoHS and REACH compliant per Skyworks product information page. Not AEC-Q100 qualified; this is industrial-grade -40 to +85C only. For automotive applications consult Skyworks for AEC-Q100 qualified variants.
