Overview
The LMK00101SQX/NOPB is a high-performance, ultra-low jitter LVCMOS fanout buffer and level translator produced by Texas Instruments. This device is designed to distribute 10 low-jitter clocks from a differential, single-ended, or crystal input, making it ideal for various networking, telecom, server, and storage area networking applications, as well as medical and test equipment.
The LMK00101 features a 3:1 input multiplexer, supports synchronous output enable for glitch-free operation, and operates with either a 2.5V or 3.3V core supply voltage. The output buffers can operate at the same supply voltage as the core or from a lower supply voltage (1.5V, 1.8V, 2.5V, or 3.3V), enabling lower power consumption and output-level compatibility.
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 | - | 85 | °C |
| Input Clock Frequency | - | - | 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 | - |
| Package Dimensions | - | - | 5.0 x 5.0 x 0.8 mm | - |
Key Features
- 10 LVCMOS/LVTTL outputs with frequencies up to 200 MHz
- Universal input supporting LVPECL, LVDS, HCSL, SSTL, and single-ended signals
- Ultra-low additive phase jitter: 30 fs at 156.25 MHz (12 kHz to 20 MHz)
- Low propagation delay and high PSRR (Power Supply Rejection Ratio)
- Separate core and output supply voltages (1.5V, 1.8V, 2.5V, or 3.3V)
- Pin-programmable device configuration
- Integrated crystal oscillator circuit supporting fundamental mode, AT-cut crystals
- Synchronous output enable for glitch-free operation
Applications
- LO reference distribution for RRU (Remote Radio Unit) applications
- SONET, Ethernet, Fibre Channel line cards
- Optical Transport Networks
- GPON OLT/ONU (Optical Line Terminal/Optical Network Unit)
- Server and Storage Area Networking
- Medical Imaging
- Portable Test and Measurement
- High-end Audio/Video equipment
Q & A
- What is the maximum clock frequency supported by the LMK00101?
The LMK00101 supports clock frequencies up to 200 MHz.
- What types of input signals does the LMK00101 support?
The LMK00101 supports universal inputs including LVPECL, LVDS, HCSL, SSTL, and single-ended signals.
- What is the additive phase jitter of the LMK00101 at 156.25 MHz?
The additive phase jitter is 30 fs at 156.25 MHz (12 kHz to 20 MHz).
- Can the output buffers operate at different supply voltages than the core?
- What is the package type and dimensions of the LMK00101?
The LMK00101 is offered in a 32-pin WQFN package with dimensions of 5.0 x 5.0 x 0.8 mm.
- Does the LMK00101 have an integrated crystal oscillator?
- How is the output enable controlled on the LMK00101?
The output enable is controlled using the OE pin, which has an internal pull-down resistor and supports synchronous output enable for glitch-free operation.
- What are some of the key applications for the LMK00101?
- How should unused outputs be handled in the LMK00101?
Unused outputs should be left floating with a minimum copper length to minimize capacitance and consume minimal output current.
- What is the significance of the SEL0 and SEL1 pins on the LMK00101?
The SEL0 and SEL1 pins are used for input clock selection, allowing the device to select between different clock inputs.
