Overview
The CDCLVD1208RHDR, produced by Texas Instruments, is a 2:8 low additive jitter LVDS clock buffer. This device is designed to distribute one of two selectable clock inputs (IN0 and IN1) to eight pairs of differential LVDS clock outputs (OUT0 through OUT7) with minimal skew. It supports clock frequencies up to 800 MHz and is compatible with LVDS, LVPECL, and LVCMOS input signals. The CDCLVD1208RHDR is packaged in a 28-pin, 5-mm × 5-mm VQFN package and operates within an industrial temperature range of –40°C to 85°C. It is specifically designed for driving 50-Ω transmission lines and includes features such as low additive jitter, low output skew, and ESD protection exceeding 3-kV HBM and 1-kV CDM.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VQFN (28) | - |
| Package Size | 5-mm × 5-mm | - |
| Operating Temperature Range | –40°C to 85°C | °C |
| Device Power Supply | 2.375 V to 2.625 V | V |
| Clock Frequency | Up to 800 MHz | MHz |
| Low Additive Jitter | < 300 fs RMS (10 kHz to 20 MHz) | fs |
| Low Output Skew | 45 ps (Maximum) | ps |
| Input Types | LVDS, LVPECL, LVCMOS | - |
| LVDS Outputs | 8 pairs, ANSI EIA/TIA-644A Standard Compatible | - |
| ESD Protection | Exceeds 3-kV HBM, 1-kV CDM | - |
Key Features
- 2:8 Differential Buffer
- Low Additive Jitter: < 300 fs RMS in 10 kHz to 20 MHz
- Low Output Skew of 45 ps (Maximum)
- Universal Inputs Accept LVDS, LVPECL, and LVCMOS
- Selectable Clock Inputs Through Control Pin
- 8 LVDS Outputs, ANSI EIA/TIA-644A Standard Compatible
- Clock Frequency: Up to 800 MHz
- LVDS Reference Voltage, VAC_REF, Available for Capacitive Coupled Inputs
- Industrial Temperature Range: –40°C to 85°C
- ESD Protection Exceeds 3-kV HBM, 1-kV CDM
Applications
- Telecommunications and Networking
- Medical Imaging
- Test and Measurement Equipment
- Wireless Communications
- General-Purpose Clocking
Q & A
- What is the primary function of the CDCLVD1208RHDR?
The CDCLVD1208RHDR is a clock buffer that distributes one of two selectable clock inputs to eight pairs of differential LVDS clock outputs.
- What types of input signals does the CDCLVD1208RHDR support?
The device supports LVDS, LVPECL, and LVCMOS input signals.
- What is the maximum clock frequency supported by the CDCLVD1208RHDR?
The device supports clock frequencies up to 800 MHz.
- What is the operating temperature range of the CDCLVD1208RHDR?
The device operates within an industrial temperature range of –40°C to 85°C.
- How many LVDS outputs does the CDCLVD1208RHDR provide?
The device provides eight pairs of differential LVDS clock outputs.
- What is the package type and size of the CDCLVD1208RHDR?
The device is packaged in a 28-pin, 5-mm × 5-mm VQFN package.
- What level of ESD protection does the CDCLVD1208RHDR offer?
The device offers ESD protection exceeding 3-kV HBM and 1-kV CDM.
- How does the IN_SEL pin function in the CDCLVD1208RHDR?
The IN_SEL pin selects the input that is routed to the outputs. If left open, it disables the outputs.
- What is the significance of the VAC_REF voltage in the CDCLVD1208RHDR?
The VAC_REF voltage is available for capacitive coupled inputs and ensures proper operation when driving single-ended inputs.
- In which applications is the CDCLVD1208RHDR commonly used?
The device is commonly used in telecommunications, medical imaging, test and measurement equipment, wireless communications, and general-purpose clocking applications.
