CLC001 CLC001 Serial Digital Cable Driver with Adjustable Outputs Literature Number: SNLS066B
CLC001 Serial Digital Cable Driver with Adjustable Outputs General Description Applications The CLC001 is a monolithic, high-speed cable driver designed for use in SMPTE 259M serial digital video and ITU-T G.703 serial digital data transmission applications. The CLC001 drives 75Ω transmission lines (Belden 8281 or equivalent) at data rates up to 622 Mbps. Controlled output rise and fall times (400 ps typical) minimize transitioninduced jitter. The output voltage swing is adjustable from 800 mVp-p to 1.
CLC001 Typical Application 10132901 www.national.
θJC Surface Mount AJE Reliability Information If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 4V Output Current 27 mA Maximum Junction Temperature Storage Temperature Range Transistor count −65˚C to +150˚C Lead Temperature ≥ 7 kV ESD Rating (MM) ≥ 500V Package Thermal Resistance θJA Surface Mount AJE Supply Voltage Range (VDD - VSS) +3.0V to +3.
CLC001 AC Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified (Note 3) Symbol Parameter Conditions Min Typ Max Units 400 800 ps tr, tf Rise time, Fall time tos Output overshoot tjit Output jitter (Note 7) 25 ps tpd Propagation delay (Note 5) 1.9 ns 20%–80%, (Notes 4, 5) 5 % Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed.
CLC001 Test Loads (Continued) 10132903 FIGURE 2. Test Circuit Pin Descriptions Pin # Name Description 1 VBB Optional, bias voltage (may be used to bias inputs) - see device operation section for details. If unused leave as no connect (NC). 2 VIN+ Positive input pin 3 VIN- Negative input pin 4 RREF Output driver level control. Connect a resistor to ground to set output voltage swing.
CLC001 Device Operation INPUT INTERFACING Numerous input configurations exist for applying PECL, LVPECL, and LVDS signals to the input of the CLC001. Inputs may be single-ended or differential, AC or DC coupled. The VBB pin may be used to provide a DC bias voltage to the inputs. Leave this pin as a no connect when no bias is needed. Note that DC-coupled inputs such as direct LVDS and LVPECL connections are self-biasing and do not require use of the VBB pin.
25Ω gives the equivalent termination resistance of 75Ω. RBB set at 5kΩ provides 1.25V of DC bias to the input. (Continued) Figure 5 shows the CLC001 with an AC-coupled, single ended input connection. The 82.5Ω resister in parallel with 10132905 FIGURE 5. Single Ended 75Ω Coaxial Cable, AC-coupled A typical DC-coupled, twisted pair cable connection is shown in Figure 6. The CLC001 is driven differentially.
CLC001 Device Operation used in conjunction with two 50Ω resistors to filter common mode noise. RBB set at 5kΩ provides 1.25V of DC bias to each input. (Continued) Figure 7 shows an AC-coupled, twisted pair cable application. It implements a center tap capacitance termination 10132907 FIGURE 7. Twisted Pair Cable, AC-coupled PECL or LVPECL drivers may be interfaced to the CLC001 as shown in Figure 8. The voltage divider network will reduce the PECL output to the proper levels.
media specific, but typically is between 100 and 120Ω. This resistor should be located close to the CLC001 inputs pins to minimize the resulting stub length between the resistor and device pads. The CLC001 supports ± 100mV thresholds across the entire LVDS common mode range of 0.1V to 2.3V for a 200mV differential signal. (Continued) A typical LVDS input connection is shown in Figure 9. The media is driven differentially by an LVDS driver.
CLC001 Device Operation vices. The evaluation boards can be ordered through National’s Distributors. Supplies are limited, please check for current availability. (Continued) OUTPUT INTERFACING The CLC001 has two complementary, ground referenced outputs designed to drive AC-coupled and terminated 75Ω coaxial cables. The outputs are single ended; however, they could be treated as a single differential output as long as current paths from each output go to ground.
CLC001 Serial Digital Cable Driver with Adjustable Outputs Physical Dimensions inches (millimeters) unless otherwise noted Order Number CLC001AJE NS Package Number M08A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com.
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