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DS3903 Datenblatt(PDF) 11 Page - Maxim Integrated Products |
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DS3903 Datenblatt(HTML) 11 Page - Maxim Integrated Products |
11 / 11 page Triple 128-Position Nonvolatile Digital Potentiometer Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. the appropriate device address bit, and the read/write bit, the slave device outputs an acknowledge signal on the SDA line. Applications Information Power-Supply Decoupling To achieve the best results when using the DS3903, decouple the power supply with a 0.01µF or 0.1µF capacitor. Use a high-quality ceramic surface-mount capacitor if possible. Surface-mount components mini- mize lead inductance, which improves performance, and ceramic capacitors tend to have adequate high- frequency response for decoupling applications. Write Protection The write-protect pin has an internal pullup resistor. To be able to adjust the potentiometers’ position, this pin must be grounded. This pin can be left floating or con- nected to VCC to write protect the potentiometer posi- tions. Wiper Resistance and Wiper Current Limit Two substantial differences between digital poten- tiometers and mechanical potentiometers are the wiper resistance and the wiper current limit. The wiper resis- tance (RW) is a result of the interconnecting materials on the IC between the internal resistive elements and the wiper pin. This can be modelled by using an ideal potentiometer, with a resistance of RW connected between the ideal wiper and wiper terminal of the digi- tal potentiometer. One final note about the wiper resis- tance is that it has a high temperature coefficient (approximately +3000PPM), which can be noticeable in certain circuit configurations. The wiper current limit (IW) is also due to the intercon- necting materials between the internal resistive ele- ments and the wiper terminal. While it may be possible to exceed this value for a short period without prob- lems, exceeding the wiper current limit is a long-term reliability problem. Both characteristics can be minimized in designs by connecting the wiper terminal to high-impedance loads. This reduces both the current through the wiper and the voltage drop across the wiper resistance. Using a Potentiometer as a Variable Resistor There are two ways to make a digital potentiometer into a variable resistor. The first is to short the wiper terminal to the high- or low-side terminal. This places wiper resistance in parallel with the resistance from the wiper to the high or low side of the potentiometer. The advan- tage of this method is that it reduces the current through the wiper, which is advantageous if the current is approaching the wiper current limit. The disadvan- tage is that the wiper resistance makes the resistance versus position nonlinear, particularly for low-resistance values. The second way is to attach the wiper terminal, and either the low- or high-side terminal. The unattached terminal is connected to the wiper by the resistance internal to the part, and stays at the same voltage as the wiper. This method provides a linear resistance ver- sus position function, but it limits the current through the resistance to IW since there is no current load shar- ing between the wiper resistance and the paralleled resistive elements. Both configurations are heavily influenced by the wiper resistance, particularly over temperature, where its tem- perature coefficient noticeably affects the resistor’s value. Chip Information TRANSISTOR COUNT: 10,793 SUBSTRATE CONNECTED TO GROUND Package Information For the latest package outline information, go to www.maxim-ic. com/packages. |
Ähnliche Teilenummer - DS3903 |
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Ähnliche Beschreibung - DS3903 |
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