CLC020

SNLS046E – FEBRUARY 2000 – REVISED APRIL 2013

www.ti.com

The Test Out output is intended for monitoring by equipment presenting high impedance loading (>500

Ω). When

monitoring the Lock Detect output, the attached monitoring circuit should present a DC resistance greater than 5

k

Ω so that Lock Detect indicator operation is not affected.

Connect LOCK DETECT to TPG ENABLE for test pattern generator function.

Remove RP1 & RP3 and replace RP2 & RP4 with 50

Ω resistor packs for coax interfacing.

Install RP1-4 when using ribbon cable for input interfacing.

This board is designed for use with TTL power supplies only.

For optional ECL compatible load: R1A = R2A = 187; R1B = R2B = 124.

All resistances & impedances in Ohms. Values with 3 significant digits are 1%; with 2 digits 5%.

Figure 9. SD020EVK Schematic Diagram

MEASURING JITTER

The test method used to obtain the timing jitter value given in the AC Electrical Specification table is based on

procedures and equipment described in SMPTE RP 192-1996. The recommended practice discusses several

methods and indicator devices. An FFT method performed by standard video test equipment was used to obtain

the data given in this data sheet. As such, the jitter characteristics (or jitter floor) of the measurement equipment,

particularly the measurement analyzer, become integral to the resulting jitter value. The method and equipment

were chosen so that the test can be easily duplicated by the design engineer using most standard digital video

test equipment. In so doing, similar results should be achieved. The intrinsic jitter floor of the CLC020's PLL is

approximately 25% of the typical jitter given in the electrical specifications. In production, device jitter is

measured on automatic IC test equipment (ATE) using a different method compatible with that equipment. Jitter

measured using this ATE yields values approximately 50% of those obtained using the video test equipment.

12

Submit Documentation Feedback

Copyright © 2000–2013, Texas Instruments Incorporated

Product Folder Links: CLC020