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CAT5121TBI-10GT3 Datasheet(PDF) 6 Page - ON Semiconductor |
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CAT5121TBI-10GT3 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 11 page CAT5120, CAT5121, CAT5122 http://onsemi.com 6 APPLICATIONS INFORMATION The devices are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast. Alternative Positive LCD Bias Control Use an op amp to provide buffering and gain on the output of the CAT5120. Connect the mechanical potentiometer to the positive input of a noninverting op amp (Figure 9) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 10 shows a similar circuit for the CAT5121. Adjustable Gain Figures 11 and 12 show how to use the variable resistor to digitally adjust the gain of a noninverting op amp configuration. Connect the CAT5121 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. The devices have a low 5 ppm/C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. 30 V W L H +5 V 30 V L H +5 V L H L H W CAT5120 CAT5121 CAT5121 CAT5120 Figure 9. Positive LCD Bias Control Figure 10. Positive LCD Bias Control Figure 11. Adjustable Gain Circuit Figure 12. Adjustable Gain Circuit VOUT VOUT VIN VCC VOUT VIN VOUT VCC |
Similar Part No. - CAT5121TBI-10GT3 |
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Similar Description - CAT5121TBI-10GT3 |
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