Overview
The LMK00334-Q1, produced by Texas Instruments, is a four-output clock buffer and level translator designed for high-frequency, low-jitter clock and data distribution. This device is AEC-Q100 qualified for automotive applications, ensuring it operates within a temperature range of –40°C to 105°C. It features a 3:1 input multiplexer, accepting various clock inputs such as LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks, as well as a crystal input. The device distributes the selected input clock to two banks of two HCSL outputs and one LVCMOS output, making it versatile for various applications requiring precise clock signals.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Core Supply Voltage | 3.3 ± 5% | V |
| Output Supply Voltage | 3.3 V ± 5%, 2.5 V ± 5% | V |
| Operating Temperature Range | –40°C to 105°C | °C |
| Input Clock Frequency Range | Up to 400 MHz | Hz |
| Crystal Frequency Range | 10 to 40 MHz | Hz |
| Additive RMS Jitter (100 MHz) | 30 fs (typical) | fs |
| PSRR at 156.25 MHz | –72 dBc | dBc |
| Package Type | 32-pin WQFN (5 mm × 5 mm) | |
| Junction-to-Ambient Thermal Resistance | 38.1 °C/W | °C/W |
Key Features
- AEC-Q100 Qualified for Automotive Applications with a temperature range of –40°C to 105°C.
- 3:1 Input Multiplexer supporting LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks, and a crystal input.
- Two banks of two HCSL outputs and one LVCMOS output with synchronous enable input.
- High PSRR of –72 dBc at 156.25 MHz.
- Low additive RMS jitter of 30 fs (typical) at 100 MHz.
- Pin-controlled configuration for output buffer modes.
- Three independent output buffer supplies (3.3 V and 2.5 V ± 5%).
Applications
- Infotainment systems: telematics, head units.
- Control units: infotainment, autonomous driving controllers.
- ADAS (Advanced Driver Assistance Systems): autonomous driving controllers.
- Distribution of reference clocks for ADCs, DACs, multi-gigabit Ethernet, XAUI, fibre channel, SATA/SAS, SONET/SDH, CPRI, and high-frequency backplanes.
Q & A
- What is the operating temperature range of the LMK00334-Q1?
The operating temperature range is –40°C to 105°C.
- What types of clock inputs does the LMK00334-Q1 support?
The device supports LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks, as well as a crystal input.
- What is the typical additive RMS jitter at 100 MHz?
The typical additive RMS jitter at 100 MHz is 30 fs.
- What is the PSRR at 156.25 MHz?
The PSRR at 156.25 MHz is –72 dBc.
- What are the output supply voltage options?
The output supply voltage options are 3.3 V ± 5% and 2.5 V ± 5%.
- What is the package type and size of the LMK00334-Q1?
The package type is a 32-pin WQFN with a size of 5 mm × 5 mm.
- What are some common applications of the LMK00334-Q1?
Common applications include infotainment systems, control units, ADAS, and high-frequency backplanes.
- How is the output buffer mode controlled?
The output buffer mode is controlled through pin strapping.
- What is the junction-to-ambient thermal resistance of the LMK00334-Q1?
The junction-to-ambient thermal resistance is 38.1 °C/W.
- Is the LMK00334-Q1 AEC-Q100 qualified?
Yes, the LMK00334-Q1 is AEC-Q100 qualified for automotive applications.
