Overview
The CDCM1802RGTRG4, produced by Texas Instruments, is a clock buffer with programmable divider, featuring LVPECL (Low-Voltage Positive Emitter-Coupled Logic) I/O and LVCMOS (Low-Voltage Complementary Metal-Oxide-Semiconductor) output. This device is designed to distribute one differential clock input to one LVPECL differential clock output and one single-ended LVCMOS output. It is particularly suited for driving 50-Ω transmission lines and operates over a wide temperature range from -40°C to 85°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VQFN (RGT) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Power Supply Voltage | 3.3 (2.5-V functional) | V |
| LVPECL Signaling Rate | Up to 800 MHz | MHz |
| LVCMOS Signaling Rate | Up to 200 MHz | MHz |
| Output Skew (LVCMOS to LVPECL) | 1.6 ns | ns |
| Receiver Input Threshold | ±75 mV | mV |
| Junction-to-Ambient Thermal Resistance | 48.4 | °C/W |
Key Features
- Distributes one differential clock input to one LVPECL differential clock output and one single-ended LVCMOS output.
- Programmable output divider for both LVPECL and LVCMOS outputs.
- 1.6-ns output skew between LVCMOS and LVPECL transitions to minimize noise.
- 3.3-V power supply with 2.5-V functional capability.
- Signaling rates up to 800 MHz for LVPECL and 200 MHz for LVCMOS.
- Differential input stage with a wide common-mode range and VBB bias voltage output for single-ended input signals.
- 16-pin VQFN package (3.00 mm × 3.00 mm).
- Enable pin (EN) to disable or enable all outputs simultaneously.
- Control pins (S0 and S1) for selecting different output mode settings.
Applications
- Networking and Data Communications
- Medical Imaging
- Portable Test and Measurement
- High-end Audio/Video (A/V) Systems
Q & A
- What is the CDCM1802RGTRG4 used for?
The CDCM1802RGTRG4 is used as a clock buffer to distribute one differential clock input to one LVPECL differential clock output and one single-ended LVCMOS output.
- What is the operating temperature range of the CDCM1802RGTRG4?
The operating temperature range is from -40°C to 85°C.
- What are the signaling rates for LVPECL and LVCMOS outputs?
The signaling rates are up to 800 MHz for LVPECL and up to 200 MHz for LVCMOS.
- How does the CDCM1802RGTRG4 minimize noise during signal transitions?
The device minimizes noise by introducing a 1.6-ns output skew between LVCMOS and LVPECL transitions.
- What is the purpose of the VBB output pin?
The VBB output pin provides a common-mode voltage reference for single-ended input signals.
- How can the output modes be controlled on the CDCM1802RGTRG4?
The output modes can be controlled using the S0 and S1 control pins, which are 3-level inputs.
- What is the function of the EN pin on the CDCM1802RGTRG4?
The EN pin enables or disables all outputs simultaneously and can be configured in three different ways: tied to GND, pulled down to VDD/2, or left floating.
- What is the package type and size of the CDCM1802RGTRG4?
The package type is VQFN (RGT) with 16 pins, and the package size is 3.00 mm × 3.00 mm.
- What are some common applications of the CDCM1802RGTRG4?
Common applications include networking and data communications, medical imaging, portable test and measurement, and high-end A/V systems.
- How should the input of the CDCM1802RGTRG4 be terminated for optimized noise performance?
The input should be properly terminated using recommended AC-coupling or DC-coupling techniques as described in the application notes SCAA062 and SCAA059.
