Overview
The LMK00105SQ/NOPB is a high-performance, ultra-low jitter LVCMOS fanout buffer and level translator produced by Texas Instruments. This device is designed to distribute five ultra-low jitter clocks from a variety of input sources, including differential, single-ended, or crystal inputs. It features a 2:1 input multiplexer and supports synchronous output enable for glitch-free operation. The LMK00105SQ/NOPB is ideal for applications requiring low skew, low jitter, and high power supply rejection ratio (PSRR), making it suitable for various networking, telecom, server, storage area networking, and medical equipment applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Core Supply Voltage (Vdd) | 2.375 | 3.3 | 3.45 | V |
| Output Supply Voltage (Vddo) | 1.425 | 1.5, 1.8, 2.5, 3.3 | Vdd | V |
| Ambient Temperature (TA) | -40 | 25 | 85 | °C |
| Output Skew | 6 | ps | ||
| Additive Phase Jitter (at 156.25 MHz) | 30 | fs | ||
| Package Type | WQFN-24 | |||
| Package Size | 4.0 mm × 4.0 mm × 0.8 mm |
Key Features
- 5 LVCMOS outputs, operating up to 200 MHz
- Universal input compatibility: LVPECL, LVDS, HCSL, SSTL, LVCMOS, and LVTTL
- Crystal oscillator interface with input frequency range of 10 to 40 MHz
- Low propagation delay and ultra-low skew of 6 ps
- Adjustable output power supply: 1.5 V, 1.8 V, 2.5 V, and 3.3 V for each bank
- Pin-programmable device configuration
- Synchronous output enable for glitch-free operation
- High PSRR and low additive jitter
Applications
- LO Reference Distribution for RRU Applications
- SONET, Ethernet, Fibre Channel Line Cards
- Optical Transport Networks
- GPON OLT/ONU
- Server and Storage Area Networking
- Medical Imaging
- Portable Test and Measurement
- High-End A/V
Q & A
- What is the maximum operating frequency of the LMK00105SQ/NOPB?
The LMK00105SQ/NOPB can operate up to 200 MHz.
- What types of input signals can the LMK00105SQ/NOPB accept?
The device can accept LVPECL, LVDS, HCSL, SSTL, LVCMOS, and LVTTL input signals.
- What is the output skew of the LMK00105SQ/NOPB?
The output skew is 6 ps.
- Can the output supply voltage be adjusted?
- What is the package type and size of the LMK00105SQ/NOPB?
The device is offered in a 24-pin WQFN package with dimensions of 4.0 mm × 4.0 mm × 0.8 mm.
- How does the output enable pin function?
The output enable pin (OE) synchronizes with the input clock to ensure glitch-free operation. When OE is High, the outputs are enabled; when it is Low, the outputs are held in a Low state and then go to a Disabled (Hi-Z) state after the next rising edge of the input clock.
- What is the recommended input slew rate for optimal performance?
An input slew rate of 2 V/ns (differential) or higher is recommended for the best possible phase noise and jitter performance.
- Can the LMK00105SQ/NOPB be driven by a crystal oscillator?
- What are some common applications of the LMK00105SQ/NOPB?
Common 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, Portable Test and Measurement, and High-End A/V.
- How should unused outputs be handled in the LMK00105SQ/NOPB?
Unused outputs should be left floating with a minimum copper length to minimize capacitance and ensure minimal output current consumption.
