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TLC2942IDBR Datasheet(PDF) 4 Page - Texas Instruments |
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TLC2942IDBR Datasheet(HTML) 4 Page - Texas Instruments |
4 / 29 page TLC2942 HIGH-PERFORMANCE DUAL PHASE-LOCKED LOOP BUILDING BLOCK SLAS146B – NOVEMBER 1996 – REVISED JUNE 1997 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description multichip module The TLC2942 is a multichip module (MCM) product that uses two TLC2932 chips. A newly developed lead frame for TLC2942IBD is specially shaped and cut in the package to electrically isolate one chip from another. The two chips are completely independent from each other to perform the best stable oscillation and locking. If asynchronous locking operation is required for these two PLL blocks, each TLC2942 VCO and PFD can achieve the same stability as the single chip TLC2932IPW. Three NC terminals are on both sides of the package between chip1 and chip2 due to the lead frame shape. To avoid performance degradation, special attention is needed for each PLL block PCB layout especially for supply voltage lines and GND patterns. voltage-controlled oscillator (VCO) VCO1 and VCO2 have the same typical characteristics. Each VCO oscillation frequency is determined by an external resistor (RBIAS) connected between each VCO VDD and BIAS terminals. The oscillation frequency and range depends on this register value. The bias resistor value for the minimum temperature coefficient is nominally 3.3 k Ω with VDD = 3 V and nominally 2.2 kΩ with VDD = 5 V. For the lock frequency range refer to the recommended operating conditions. Figure 1 shows the typical frequency variation and VCO control voltage. VCO Oscillation Frequency Range Bias Resistor (RBIAS) 1/2 VDD VCO Control Voltage (VCOIN) Figure 1. VCO1 and VCO2 Oscillation Frequency VCO output frequency 1/2 divider SELECT1 and SELECT2 select between fosc and 1/2 fosc for the VCO output frequencies as shown in Table 1. Table 1. SELECT1 and SELECT2 Function Table SELECT1 VCO1 OUTPUT FREQUENCY SELECT2 VCO2 OUTPUT FREQUENCY Low fosc1 Low fosc2 High 1/2 fosc1 High 1/2 fosc2 |
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