company blog about TI LMK00308SQ 3GHz Ultra-Low Additive Jitter Differential Clock Buffer With 8 Configurable Outputs

TI LMK00308SQ 3GHz Ultra-Low Additive Jitter Differential Clock Buffer With 8 Configurable Outputs

With the rapid development of 5G, AI and IoT technologies, the market demand for high-performance clock buffers continues to grow. The LMK00308SQ has become the preferred choice of many customers due to its excellent performance and reliability. Shenzhen Mingjiada Electronics Co., Ltd. is now supplying TI LMK00308SQ ultra-low additive jitter differential clock buffer. The LMK00308SQ is a high-performance clock buffer, suitable for the clock signal requirements of very high application scenarios, such as high-performance computing, server motherboards and communications equipment.

Details of LMK00308SQ:

1，Product Description Of LMK00308SQ

LMK00308SQ is a 3-GHz, 8-output differential fanout buffer intended for high-frequency, low-jitter clock/data distribution and level translation. The input clock can be selected from two universal inputs or one crystal input. The selected input clock is distributed to two banks of 4 differential outputs and one LVCMOS output. Both differential output banks can be independently configured as LVPECL, LVDS, or HCSL drivers, or disabled. The LVCMOS output has a synchronous enable input for runt-pulse-free operation when enabled or disabled. The LMK00308 operates from a 3.3 V core supply and 3 independent 3.3 V/2.5 V output supplies.

LMK00308SQ provides high performance, versatility, and power efficiency, making it ideal for replacing fixed-output buffer devices while increasing timing margin in the system.

2，Specification Of LMK00308SQ

Type：Fanout Buffer (Distribution), Multiplexer, Translator

Number of Circuits：1

Ratio - Input:Output：3:9

Differential - Input:Output：Yes/Yes

Input：CML, HCSL, HSTL, LVDS, LVPECL, SSTL, Crystal

Output：HCSL, LVCMOS, LVDS, LVPECL

Frequency - Max：3.1 GHz

Voltage - Supply：3.15V ~ 3.45V

Operating Temperature：-40°C ~ 85°C

Number of Outputs: 9 Output

Max Output Freq: 3.1 GHz

Propagation Delay - Max: 2.3 ns

Output Type: HCSL, LVCMOS, LVDS, LVPECL

Supply Voltage - Min: 3.15 V

Supply Voltage - Max: 3.45 V

Unit Weight: 54.700 mg

3，Feature Of LMK00308SQ

3:1 Input Multiplexer:

Two Universal Inputs Operate up to 3.1 GHz and Accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or Single-Ended Clocks

One Crystal Input Accepts a 10 to 40 MHz Crystal or Single-Ended Clock

Two Banks with 4 Differential Outputs Each:

LVPECL, LVDS, HCSL, or Hi-Z (Selectable Per Bank)

LVPECL Additive Jitter with LMK03806 Clock Source at 156.25 MHz:

20 fs RMS (10 kHz to 1 MHz)

51 fs RMS (12 kHz to 20 MHz)

High PSRR: -65 / -76 dBc (LVPECL/LVDS) at 156.25 MHz

LVCMOS Output with Synchronous Enable Input

Pin-Controlled Configuration

VCC Core Supply: 3.3 V ± 5%

3 Independent VCCO Output Supplies: 3.3 V/2.5 V ± 5%

Industrial Temperature Range: -40°C to +85°C

40-lead WQFN (6 mm × 6 mm)

4，LMK00308SQ has the following features:

Ultra-low jitter performance: LMK00308SQ supports up to 3100 MHz output frequency to ensure clock signal stability and accuracy.

Multiple Output Types: LMK00308SQ supports multiple output types such as HCSL, LVCMOS, LVDS and LVPECL to meet different application requirements.

Wide temperature range: Operating temperature range of -40°C to +85°C for harsh industrial environments.

High integration: WQFN-40 package, compact size, suitable for high-density circuit design.

Compared with similar products, the LMK00308SQ offers significant advantages in terms of jitter performance and output flexibility, making it particularly suitable for application scenarios where the quality of the clock signal is critical.

5，Application Scenarios Of LMK00308SQ

Communication and Networking: LMK00308SQ is used for high-speed data transmission and network synchronisation to improve system jitter margin.

Medical imaging: The LMK00308SQ ensures the accuracy and stability of imaging systems when driven by low-jitter clock signals.

Test and Measurement: The LMK00308SQ provides stable clock signals for high-precision test equipment, reducing measurement errors.

Wireless Infrastructure: The LMK00308SQ supports high-frequency clock distribution to optimise the performance of wireless communication systems.

6，Functional Block Diagram Of LMK00308SQ

7，LVPECL Output Swing (VOD) vs. Frequency Of LMK00308SQ