Overview
The LMK00301ARHST, produced by Texas Instruments, is a 3-GHz, 10-output differential fanout buffer designed for high-frequency, low-jitter clock and data distribution, and level translation. This component is ideal for replacing fixed-output buffer devices and increasing timing margin in various systems. It operates from a 3.3-V core supply and three independent 3.3-V or 2.5-V output supplies, offering high performance, versatility, and power efficiency.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | WQFN (48 pins) | |
| Package Size | 7.00 mm × 7.00 mm | |
| Core Supply Voltage (VCC) | 3.3 V ± 5% | V |
| Output Supply Voltages (VCCO) | 3.3 V or 2.5 V ± 5% | V |
| Input Frequency Range (CLKin) | Up to 3.1 GHz | |
| Crystal Frequency Range (OSCin) | 10 MHz to 40 MHz | |
| Output Types | LVPECL, LVDS, HCSL, or Hi-Z (selectable per bank) | |
| LVPECL Additive Jitter (at 156.25 MHz) | 20 fs RMS (10 kHz to 1 MHz), 51 fs RMS (12 kHz to 20 MHz) | fs |
| PSRR (Power Supply Rejection Ratio) | -65 dBc (LVPECL), -76 dBc (LVDS) at 156.25 MHz | dBc |
Key Features
- 3:1 input multiplexer with two universal inputs and one crystal input.
- Two banks with five differential outputs each, configurable as LVPECL, LVDS, HCSL, or Hi-Z.
- LVCMOS output with synchronous enable input for runt-pulse-free operation.
- Pin-controlled configuration for output buffer types.
- High PSRR: -65 dBc (LVPECL) and -76 dBc (LVDS) at 156.25 MHz.
- Industrial temperature range: -40°C to +85°C.
Applications
- Clock distribution and level translation for ADCs, DACs, multi-gigabit Ethernet, XAUI, Fibre Channel, SATA/SAS, SONET/SDH, CPRI.
- Switches, routers, line cards, timing cards.
- Servers, computing, PCI Express (PCIe 3.0, 4.0, 5.0, 6.0).
- Remote radio units and baseband units.
Q & A
- What is the primary function of the LMK00301ARHST? The LMK00301ARHST is a 3-GHz, 10-output differential fanout buffer designed for high-frequency, low-jitter clock and data distribution, and level translation.
- What are the input options for the LMK00301ARHST? The device has two universal inputs that operate up to 3.1 GHz and accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks, and one crystal input that accepts 10 MHz to 40 MHz crystal or single-ended clock.
- What are the output configurations available for the LMK00301ARHST? The device has two banks with five differential outputs each, which can be independently configured as LVPECL, LVDS, HCSL, or Hi-Z.
- What is the power supply requirement for the LMK00301ARHST? The device operates from a 3.3-V core supply and three independent 3.3-V or 2.5-V output supplies.
- What is the operating temperature range of the LMK00301ARHST? The operating temperature range is -40°C to +85°C.
- What are the typical applications of the LMK00301ARHST? Typical applications include clock distribution and level translation for various high-speed interfaces, switches, routers, servers, and remote radio units.
- How does the LMK00301ARHST handle jitter? The device features ultra-low additive jitter, with 20 fs RMS (10 kHz to 1 MHz) and 51 fs RMS (12 kHz to 20 MHz) at 156.25 MHz.
- What is the significance of the PSRR in the LMK00301ARHST? The high PSRR (-65 dBc for LVPECL and -76 dBc for LVDS at 156.25 MHz) indicates excellent power supply noise rejection.
- Can the LMK00301ARHST be used in safety-critical applications? It is important to consult the datasheet and Texas Instruments' guidelines for use in safety-critical applications.
- What package options are available for the LMK00301ARHST? The device is available in a 48-pin WQFN package.
