Overview
The LMK00101SQ/NOPB from Texas Instruments is a high-performance, ultra-low jitter LVCMOS fanout buffer and level translator. This device is designed to distribute 10 ultra-low jitter clocks from a variety of input sources, including differential, single-ended, or crystal inputs. It is particularly suited for applications requiring low noise and high precision clock distribution, such as in networking, telecommunications, server and storage area networking, and medical equipment.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Core Supply Voltage (Vdd) | 2.375 | 3.3 | 3.45 | V |
| Output Supply Voltage (Vddo) | 1.425 | - | Vdd | V |
| Operating Temperature (TA) | -40 | 25 | 85 | °C |
| Input Frequency Range | 10 | - | 40 | MHz |
| Output Frequency Range | DC | - | 200 | MHz |
| Additive Phase Jitter at 156.25 MHz | - | 30 | - | fs (12 kHz to 20 MHz) |
| Output Skew | - | 6 | - | ps |
| Package Type | - | 32-pin WQFN | - | - |
Key Features
- 10 LVCMOS/LVTTL outputs with ultra-low jitter
- Universal input capability: supports LVPECL, LVDS, HCSL, SSTL, and single-ended or differential inputs
- Crystal oscillator interface for fundamental mode, AT-cut crystals
- 3:1 input multiplexer for clock input selection
- Pin-programmable device configuration
- Separate core and output supply voltages (1.5 V, 1.8 V, 2.5 V, and 3.3 V)
- Low propagation delay and high PSRR (Power Supply Rejection Ratio)
- Output enable for glitch-free operation
- Compact 32-pin WQFN package (5.0 x 5.0 x 0.8 mm)
Applications
- LO Reference Distribution for RRU (Remote Radio Unit) Applications
- SONET, Ethernet, Fibre Channel Line Cards
- Optical Transport Networks
- GPON OLT/ONU (Gigabit Passive Optical Network Optical Line Terminal/Optical Network Unit)
- Server and Storage Area Networking
- Medical Imaging Equipment
- Portable Test and Measurement Equipment
- High-end Audio/Video Systems
Q & A
- What is the primary function of the LMK00101SQ/NOPB?
The LMK00101SQ/NOPB is a high-performance, ultra-low jitter LVCMOS fanout buffer and level translator designed to distribute 10 ultra-low jitter clocks from various input sources.
- What types of input signals can the LMK00101SQ/NOPB support?
The device supports universal inputs including LVPECL, LVDS, HCSL, SSTL, and single-ended or differential signals.
- What is the frequency range for the input and output clocks?
The input frequency range is from 10 MHz to 40 MHz, and the output frequency range is from DC to 200 MHz.
- What is the additive phase jitter of the LMK00101SQ/NOPB at 156.25 MHz?
The additive phase jitter is 30 fs (12 kHz to 20 MHz).
- Can the output supply voltage be different from the core supply voltage?
- What is the package type and size of the LMK00101SQ/NOPB?
The device is offered in a 32-pin WQFN package with dimensions of 5.0 x 5.0 x 0.8 mm.
- How is the clock input selection controlled on the LMK00101SQ/NOPB?
Clock input selection is controlled using the SEL0 and SEL1 pins.
- What is the purpose of the OE (Output Enable) pin?
The OE pin allows for glitch-free operation by enabling or disabling the outputs.
- Can the LMK00101SQ/NOPB be used with less than ten outputs?
- What are some typical applications for the LMK00101SQ/NOPB?
Typical applications include LO reference distribution for RRU, SONET, Ethernet, Fibre Channel line cards, optical transport networks, GPON OLT/ONU, server and storage area networking, medical imaging, and high-end audio/video systems.
