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CAT5122SBI-00-T Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT5122SBI-00-T Datasheet(HTML) 8 Page - Catalyst Semiconductor |
8 / 11 page CAT5120/5121/5122 8 Doc. No. 2121, Rev. A APPLICATIONS INFORMATION The Minipots are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display con- trast. 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 3) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 4 shows a similar circuit for the CAT5121. Adjustable Gain Figure 5 shows 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 Minipots have a low 5ppm/ ˚C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. Figure 3. Positive LCD Bias Control Figure 4. Positive LCD Bias Control Figure 5a. Adjustable Gain Circuit Figure 5b. Adjustable Gain Circuit 30V W L H +5V VOUT 30V L H +5V VOUT VCC L H VIN VOUT VCC L H W VIN VOUT CAT5120 CAT5121 CAT5121 CAT5120 |
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Similar Description - CAT5122SBI-00-T |
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