CLC020

www.ti.com

SNLS046E – FEBRUARY 2000 – REVISED APRIL 2013

APPLICATION INFORMATION

A typical application circuit for the CLC020 is shown in Figure 8. This circuit demonstrates the capabilities of the

CLC020 and allows its evaluation in a variety of configurations. An assembled demonstration board with more

comprehensive evaluation options is available, part number SD020EVK. The board may be ordered through any

of Texas Instruments's sales offices. Complete circuit board layouts and schematics, for the SD020EVK are

available on Texas Instruments' WEB site in the application information for this device.

APPLICATION CIRCUIT

Figure 8. Typical Application Circuit

Several different input and output drive and loading options can be constructed on the SD020EVK application

circuit board, Figure 9. Pin headers are provided for input cabling and control signal access. The appropriate

value resistor packs, 220 and 330

Ω for TTL or 50Ω for signal sources requiring such loading, should be installed

at RP1-4 before applying input signals.

The board's outputs may be DC interfaced to PECL inputs by first installing 124

Ω resistors at R1B and R2B,

changing R1A and R2A to 187

Ω and replacing C1 and C2 with short circuits. The PECL inputs should be directly

connected to J1 and J2 without cabling. If 75

Ω cabling is used to connect the CLC020 to the PECL inputs, the

voltage dividers used on the CLC020 outputs must be removed and re-installed on the circuit board where the

PECL device is mounted. This will provide correct termination for the cable and biasing for both the CLC020's

outputs and the PECL inputs. It is most important to note that a 75

Ω or equivalent DC loading (measured with

respect to the negative supply rail) must always be installed at both of the CLC020's SDO outputs to obtain

proper signal levels from device. When using 75

Ω Thevenin-equivalent load circuits, the DC bias applied to the

SDO outputs should not exceed +3V with respect to the negative supply rail. Serial output levels should be

Copyright © 2000–2013, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Links: CLC020