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Overview

Texas Instruments offers a wide range of phase lock loop (PLL) building block products. The products offer flexibility to the design engineer with a selection of both analog and digital PLL products.

For general purpose video clock synchronization and generation, TI's TLC29xx CMOS family of products are an industry leader in analog PLL's because of their variable frequency locking point capability. High speed and stable oscillation make these devices suitable for high performance operation. Typical applications include:

  • Frequency Synthesis
  • Modulation/Demodulation
  • Fractional Frequency Division

The TLC29xx is composed of a voltage-controlled oscillator (VCO) and an edge-triggered type phase frequency detector (PFD). The TLC2932 VCO + PFD can be used for CLK generation for any signal processing requiring a locking range of 8-to-50 MHz at 5 Volt operation. The TLC2933 VCO + PFD has a locking range from 47-to-100 MHz. TLC29xx does not exhibit the noise and jitter problems found with many custom ASIC's which degrade their performance. The TLC2942 uses TI's multichip packaging technology to encase two TLC2932 chips. The multichip packaging ensures that the chips are completely independent (substrate and leadframe) hence rendering complete isolation and no performance degradation due to common substrate noise or jitter.

An external bias resistor (RBIAS) sets the oscillation frequency range of the VCO. The VCO has a divide-by-two output frequency function. The high speed PFD detects the phase difference between the reference frequency input and the variable frequency input supplied by external counter logic. Both the VCO and the PFD have an inhibit function which increases flexibility and can be used as a power-down mode.

The TLC2943 is a dual TLC2933 in a multichip packaged format. The TLC2940 is a standalone VCO. The scheduled release for both these products is 1Q2000.