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CA3126M1 Datasheet(PDF) 8 Page - Harris Corporation |
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CA3126M1 Datasheet(HTML) 8 Page - Harris Corporation |
8 / 9 page 8-40 curve of the typical static phase error as a function of the free- running oscillator frequency is shown in Figure 2. It should be noted that the slope of the curve determines the DC gain of the phase-locked loop, i.e., 40Hz per degree. Thermal Considerations The circuit of the CA3126 is thermally compensated to achieve the optimal operating characteristics over the normal operating temperature range of TV receivers. Figures 3 and 4 show the oscillator and chroma-output amplitudes and phases as a func- tion of temperature (Terminals 8 and 15), respectively. Both the oscillator and chroma-output amplitudes and phases are measured relative to the chroma-input phase. The performance of the oscillator free-running frequency as a function of temperature is shown in Figure 5. All the tem- perature plots are characteristic of the test circuit with the indicated component types and values given. OSCILLATOR FREE-RUNNING FREQUENCY 300 -300 -200 -100 0 100 200 TA = 25 oC 6 400 (DEVIATION IN Hz FROM 3.579545MHz) 4 2 0 -2 -4 FIGURE 2. STATIC PHASE ERROR TEMPERATURE (oC) PHASE AMPLITUDE 100 -50 -25 0 25 50 75 60 70 80 90 100 110 CHROMA INPUT = 0.25VP-P, 3.58MHz CW SIGNAL -10 -5 0 FIGURE 3. AMPLITUDE AND PHASE VARIATIONS OF OSCILLATOR OUTPUT vs TEMPERATURE TEMPERATURE (oC) PHASE AMPLITUDE 100 -50 -25 0 25 50 75 80 90 100 110 120 130 CHROMA INPUT = 0.25VP-P, -10 5 10 15 0 -5 -15 140 3.58MHz CW SIGNAL FIGURE 4. AMPLITUDE AND PHASE VARIATIONS OF CHROMA OUTPUT vs TEMPERATURE TEMPERATURE (oC) 125 -50 -25 0 25 50 75 -150 -100 -50 0 50 100 100 CHROMA INPUT = 0VP-P FIGURE 5. VARIATION OF OSCILLATOR FREE RUNNING FREQUENCY vs TEMPERATURE CA3126 |
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