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MAX5461EXT Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX5461EXT Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 10 page 32-Tap FleaPoT™, 2-Wire Digital Potentiometers 6 _______________________________________________________________________________________ Power-On Reset All parts in this family feature power-on reset (POR) cir- cuitry that sets the wiper position to midscale at power- up. By default, the chip is in the increment mode. Applications Information The MAX5460–MAX5468 are intended for circuits requiring digitally controlled adjustable resistance, such as LCD contrast control, where voltage biasing adjusts the display contrast. Controlling a Switch-Mode LCD Bias Generator Figure 3 shows an application where the variable resis- tor is used with a MAX1771 to make an adjustable posi- tive LCD-bias circuit. The output of the MAX1771 is a positive voltage that is digitally controlled through the MAX5461/MAX5464/MAX5467. Similarly, Figure 4 shows the application of the variable resistor in a digi- tally controlled negative LCD-bias circuit along with the MAX774/MAX775/MAX776. Alternative Positive LCD Bias Control Alternatively, use an op amp to provide buffering and gain to the output of the MAX5462/MAX5465/MAX5468. Connect the mechanical potentiometer to the positive input of a noninverting op amp (Figure 5) to select a portion of the input signal by digitally controlling the wiper terminal. Figure 6 shows a similar circuit for the MAX5461/MAX5464/MAX5467. Adjustable Gain Figure 7 shows how to use the variable resistor to digi- tally adjust the gain of a noninverting op amp configura- tion. Connect the MAX5461/MAX5464/MAX5467 in series with a resistor to ground to form the adjustable gain control of a noninverting amplifier. The MAX5460– MAX5468 have a low 5ppm/°C ratiometric tempco that allows for a very stable adjustable gain configuration over temperature. Figure 3. Adjustable Positive LCD Bias Figure 4. Adjustable Negative LCD Bias MAX774 MAX775 MAX776 OUT V+ SHDN CS FB EXT GND P 7 8 C2 0.1µF R3 0.07Ω R1 R2 RVAR C1 150µF 6 5 2 3 1 REF 4 Q1 Si9435 1N5822/ MBR340 L1 22µH C4 * VIN C3 0.1µF VOUT * MAX774 = 330µF, 10V MAX775/MAX776 = 120µF, 20V VOUT(MAX) = R2 , VOUT(MIN) = R2 VREF R1 VREF R1 + RVAR VREF - VFB ≥ 5µA (FOR 2% GAIN-SETTING ACCURACY) R1 + RVAR MAX5461 MAX5464 MAX5467 MAX1771 VIN = 5V REF SHDN AGND GND N MTD20N03HDL 7 EXT CS FB L1 22µH D1 1N5817-22 C4 300µF C5 C3 0.1µF 5 4 6 1 8 3 2 V+ C1 68µF VOUT = 12V AT 0.5A R2 RSENSE 40mΩ C2 0.1µF VREF = 1.5V R1 RVAR VOUT(MAX) = R2 + 1 VREF R1 VOUT(MIN) = ( R2 ) +1 VREF R1 + RVAR(MAX) MAX5461 MAX5464 MAX5467 |
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