Overview
The LMK00105SQE/NOPB from Texas Instruments is a high-performance, ultra-low jitter LVCMOS fanout buffer and level translator. 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 supports synchronous output enable for glitch-free operation and is ideal for applications requiring low skew, low jitter, and high power supply rejection ratio (PSRR). The LMK00105 operates with core supply voltages of 2.5 or 3.3 V and adjustable output supply voltages of 1.5, 1.8, 2.5, or 3.3 V, making it versatile for various networking, telecom, server, and storage area networking applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Ambient Temperature | -40 | 25 | 85 | °C |
| Core Supply Voltage (Vdd) | 2.375 | 3.3 | 3.45 | V |
| Output Supply Voltage (Vddo) | 1.425 | - | 3.3 | V |
| Output Skew | - | 6 | 25 | ps |
| Propagation Delay (tPD) | 0.85 | 1.4 | 2.2 | ns |
| Additive Phase Jitter | - | - | 30 | fs (at 156.25 MHz, 12 kHz to 20 MHz) |
| Output Frequency (fCLKout) | - | - | 200 | MHz |
| Package Type | - | - | 24-Pin WQFN | - |
| Package Size | - | - | 4.0 mm × 4.0 mm × 0.8 mm | - |
Key Features
- 5 LVCMOS outputs with ultra-low jitter
- Universal input support: LVPECL, LVDS, HCSL, SSTL, LVCMOS, and LVTTL
- Crystal oscillator interface with input frequency range of 10 to 40 MHz
- Low propagation delay and output 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
- High power supply rejection ratio (PSRR)
- Output enable pin for glitch-free operation
- 24-pin WQFN package (4.0 mm × 4.0 mm × 0.8 mm)
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 output frequency of the LMK00105?
The LMK00105 can operate up to 200 MHz.
- What types of input signals can the LMK00105 accept?
The LMK00105 can accept LVPECL, LVDS, HCSL, SSTL, LVCMOS, and LVTTL input signals.
- What is the typical output skew of the LMK00105?
The output skew is typically 6 ps.
- Can the output supply voltage be different from the core supply voltage?
- What is the package type and size of the LMK00105?
The LMK00105 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) enables the outputs when held High and disables them when held Low, ensuring glitch-free operation.
- What is the recommended input slew rate for optimal performance?
A high slew rate of 2 V/ns (differential) or higher is recommended for the best possible phase noise and jitter performance.
- Can the LMK00105 be used with less than five outputs?
- What are some common applications of the LMK00105?
- How does the device handle thermal management?
