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MAX5402 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5402 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 9 page 256-Tap, µPoT, Low-Drift, Digital Potentiometer ________________________________________________________________________________________ 7 Applications Information The MAX5402 is intended for a variety of circuits where accurate, fine-tuned adjustable resistance is required, such as in adjustable voltage or adjustable gain circuit configurations. The MAX5402 is used in either a poten- tiometer divider or a variable resistor configuration. Adjustable Current to Voltage Converter Figure 4 shows the MAX5402 used with a MAX4250 low-noise op amp to precisely tune a current-to-voltage converter. Pins H and W of the MAX5402 are connect- ed to the node between R3 and R2, and pin L is con- nected to ground. Adjustable Gain Amplifier The MAX5402 is used again with the MAX4250 to make a digitally adjustable gain circuit as shown in Figure 5. The normal feedback resistor is replaced with the MAX5402 in a variable resistor configuration, so that the gain of the circuit can be digitally controlled. Adjustable Voltage Reference In Figure 6, the MAX5402 is shown with the MAX6160 to make an adjustable voltage reference. In this circuit, the H pin of the MAX5402 is connected to the OUT pin of the MAX6160, the L pin of the MAX5402 is connect- ed to GND, and the W pin of the MAX5402 is connect- ed to the ADJ pin of the MAX6160. The MAX5402 allows precise tuning of the voltage reference output. A low 5ppm/°C ratiometric tempco allows a very stable adjustable voltage overtemperature. +5V R3 VO / IS = R3(1 + R2 / R1) + R2 R2 R1 MAX4250 VO W H L MAX5402 Figure 4. I to V Converter +5V VS VO R2 VO / VS = 1 + R2 / R1 R1 W H L MAX4250 MAX5402 Figure 5. Noninverting Amplifier Data Word B0 (D7) B1 (D6) B2 (D5) B3 (D4) B4 (D3) B5 (D2) B6 (D1) B7 (D0) (MSB) First Bit In (LSB) Last Bit In Figure 3. Serial Data Format |
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