Overview
The LMK00306SQX/NOPB from Texas Instruments is a 3-GHz, 6-output ultra-low additive jitter differential clock buffer and level translator. This device is designed for high-frequency, low-jitter clock and data distribution, making it ideal for various high-speed applications. It features a 3:1 input multiplexer, allowing selection from two universal inputs or one crystal input, and distributes the selected clock to two banks of three differential outputs each, along with one LVCMOS output. The device operates from a 3.3 V core supply and three independent 3.3 V or 2.5 V output supplies, ensuring high performance, versatility, and power efficiency.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Core Supply Voltage (Vcc) | 3.3 V ± 5% | V | ||
| Output Supply Voltage (Vcco) | 3.3 V / 2.5 V ± 5% | V | ||
| Universal Input Frequency | Up to 3.1 GHz | Hz | ||
| Crystal Input Frequency | 10 MHz | 40 MHz | Hz | |
| Output Types | LVPECL, LVDS, HCSL, or Hi-Z | |||
| LVPECL Additive Jitter (RMS) | 20 fs (10 kHz to 1 MHz) | 51 fs (12 kHz to 20 MHz) | fs | |
| PSRR (LVPECL/LVDS) | -65 dBc (156.25 MHz) | -76 dBc (156.25 MHz) | dBc | |
| Operating Temperature Range | -40°C | +85°C | °C | |
| Package Type | 36-lead WQFN (6 mm × 6 mm) |
Key Features
- 3:1 input multiplexer with two universal inputs and one crystal input.
- Accepts LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks.
- Two banks with three differential outputs each, configurable as LVPECL, LVDS, HCSL, or Hi-Z.
- LVCMOS output with synchronous enable input.
- High PSRR: -65 / -76 dBc at 156.25 MHz for LVPECL/LVDS outputs.
- Pin-controlled configuration.
- 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.
- High-frequency backplanes, switches, routers, line cards, timing cards.
- Servers, computing, PCI Express (PCIe 3.0).
- Remote radio units and baseband units.
Q & A
- What is the maximum frequency of the universal inputs on the LMK00306?
The universal inputs on the LMK00306 can operate up to 3.1 GHz. - What types of clock signals can the LMK00306 accept?
The LMK00306 can accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks. - How many differential outputs does the LMK00306 have?
The LMK00306 has two banks of three differential outputs each. - What is the typical additive jitter of the LVPECL outputs?
The typical additive jitter of the LVPECL outputs is 20 fs RMS (10 kHz to 1 MHz) and 51 fs RMS (12 kHz to 20 MHz). - What is the power supply voltage range for the core and output supplies?
The core supply voltage is 3.3 V ± 5%, and the output supplies can operate at 3.3 V or 2.5 V ± 5%. - What is the operating temperature range of the LMK00306?
The operating temperature range is -40°C to +85°C. - What package type is the LMK00306 available in?
The LMK00306 is available in a 36-lead WQFN package (6 mm × 6 mm). - What are some common applications of the LMK00306?
Common applications include clock distribution and level translation for high-speed interfaces, servers, computing, and telecommunications equipment. - How does the LMK00306 handle clock input selection?
The LMK00306 features a 3:1 input multiplexer that allows selection from two universal inputs or one crystal input. - What is the purpose of the LVCMOS output with synchronous enable input?
The LVCMOS output with synchronous enable input allows for runt-pulse-free operation when enabled or disabled.
