Overview
The LMK00301ARHSR from Texas Instruments is a 3-GHz, 10-output differential fanout buffer and level translator designed for high-frequency, low-jitter clock and data distribution. This component offers high performance, versatility, and power efficiency, making it ideal for replacing fixed-output buffer devices and increasing timing margin in various systems. It features a 3:1 input multiplexer with two universal inputs and one crystal input, and it can distribute the selected input clock to two banks of five differential outputs and one LVCMOS output.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Frequency Range (CLKin0/CLKin0*, CLKin1/CLKin1*) | Functional | DC | 3.1 GHz | ||
| Core Supply Voltage (VCC) | -0.3 | 3.3 ± 5% | 3.6 | V | |
| Output Supply Voltage (VCCO) | -0.3 | 3.3 V or 2.5 V ± 5% | 3.6 | V | |
| Operating Temperature Range | -40°C | +85°C | °C | ||
| LVPECL Additive Jitter (10 kHz to 1 MHz) | CLKin: 156.25 MHz | 20 fs RMS | |||
| LVPECL Additive Jitter (12 kHz to 20 MHz) | CLKin: 156.25 MHz | 51 fs RMS | |||
| PSRR (LVPECL) | At 156.25 MHz | -65 dBc | |||
| PSRR (LVDS) | At 156.25 MHz | -76 dBc | |||
| Output Frequency Range (LVPECL) | DC | 3100 MHz | |||
| Output Frequency Range (LVDS) | DC | 2100 MHz | |||
| Output Frequency Range (HCSL) | DC | 800 MHz |
Key Features
- 3:1 input multiplexer with two universal inputs operating up to 3.1 GHz and accepting LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks.
- One crystal input accepting 10 MHz to 40 MHz crystal or single-ended clock.
- Two banks with five differential outputs each, configurable as LVPECL, LVDS, HCSL, or Hi-Z per bank.
- LVCMOS output with synchronous enable input for runt-pulse-free operation.
- High PSRR: -65 dBc (LVPECL) and -76 dBc (LVDS) at 156.25 MHz.
- Pin-controlled configuration for output buffer types.
- Three independent VCCO output supplies: 3.3 V or 2.5 V ± 5%.
- Industrial temperature range: -40°C to +85°C.
Applications
- Clock distribution and level translation for ADCs, DACs, multi-gigabit Ethernet, XAUI, Fibre Channel, SATA/SAS, SONET/SDH, CPRI.
- Switches, routers, line cards, timing cards.
- Servers, computing, PCI Express (PCIe 3.0, 4.0, 5.0, 6.0).
- Remote radio units and baseband units.
- High-frequency backplanes.
Q & A
- What is the maximum input frequency for the universal inputs of the LMK00301?
The universal inputs can operate up to 3.1 GHz.
- What types of clock inputs can the LMK00301 accept?
The LMK00301 can accept LVPECL, LVDS, CML, SSTL, HSTL, HCSL, or single-ended clocks.
- How many differential output banks does the LMK00301 have, and what are the output types?
The LMK00301 has two banks with five differential outputs each, configurable as LVPECL, LVDS, HCSL, or Hi-Z per bank.
- What is the operating temperature range of the LMK00301?
The operating temperature range is -40°C to +85°C.
- What are the power supply options for the LMK00301?
The core supply voltage is 3.3 V ± 5%, and the output supplies can be either 3.3 V or 2.5 V ± 5%.
- What is the PSRR of the LMK00301 for LVPECL and LVDS outputs?
The PSRR is -65 dBc for LVPECL and -76 dBc for LVDS at 156.25 MHz.
- Can the LMK00301 be used in high-frequency applications?
Yes, the LMK00301 is designed for high-frequency, low-jitter clock and data distribution.
- What are some common applications of the LMK00301?
Common applications include clock distribution and level translation for various high-speed interfaces, servers, computing, and remote radio units.
- Does the LMK00301 have any special configuration options?
Yes, the output buffer types can be configured using pin controls.
- Is the LMK00301 suitable for use in industrial environments?
Yes, it operates within an industrial temperature range of -40°C to +85°C.
