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DS1666-100 Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS1666-100 Datasheet(HTML) 2 Page - Dallas Semiconductor |
2 / 7 page DS1666, DS1666S 022698 2/7 GRAPH OF AUDIO TAPER Figure 1 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 LOW TERMINAL HIGH TERMINAL % OF ACTIVE DIGITAL TAPS 1 3 2 1 OPERATION The CS, U/D and INC inputs control the position of the wiper along the resistor array (Figure 1). When CS is ac- tive (low), a high to low transition on the INC will incre- ment or decrement an internal counter depending on the level of the U/D pin. When the U/D pin is low, the counter will decrement. When the U/D pin is high, the counter will increment. The state of the U/D pin can be changed while CS is active allowing for precise adjustment during cali- bration. The output of the counter is decoded to set the position of the wiper. When the CS input transitions to the high (inactive) level, the value of the counter is stored and the wiper position is maintained until power (VCC) is lost. When power is restored, the DS1666 returns to the de- fault setting and positions the wiper to 10 percent. The value of the end–to–end and end–to–wiper position is in- determinate while VCC is not applied. The DS1666 has a resistor array that resembles an au- dio taper potentiometer as shown in Figure 1 1. Since the taper is not linear, exact resistance values for each of the 128 positions of the resistor is not specified. How- ever, the end-to-end resistance is specified to be within ±20 percent of the stated resistor value over an indus- trial temperature range of –40 °C to +85°C. ANALOG CHARACTERISTICS End–to–End Resistance Tolerance = ±20 percent Typical Noise = <120 dB/Hz REF:IV Temperature Coefficient = ±800 PPM/°C typical Resistance at tap #74=18% ± 2% of total resistance. PIN DESCRIPTIONS VH The high end of the potentiometer. This terminal is capable of handling input volt- ages between ±5 volts. VL The Low end of the potentiometer. This terminal is capable of handling input volt- ages between ±5 volts. VW The wiper terminal of the potentiometer. The value of the wiper is controlled by the U/D and the INC pins. Up/Down The U/D input controls the direc- (U/D) tion of the wiper movement when setting the potentiometer. Increment Toggling INC will move the potentiome- (INC) ter wiper by either incrementing or decre- menting the counter. Chip Select The device is selected when CS input is (CS) low. The current counter value is stored when CS is returned high. |
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