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AD5110 Datasheet(PDF) 19 Page - Analog Devices |
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AD5110 Datasheet(HTML) 19 Page - Analog Devices |
19 / 24 page Data Sheet AD5111/AD5113/AD5115 Rev. 0 | Page 19 of 24 RDAC ARCHITECTURE To achieve optimum performance, Analog Devices, Inc., has patented the RDAC segmentation architecture for all the digital potentiometers. In particular, the AD5111/AD5113/AD5115 employ a two-stage segmentation approach as shown in Figure 42. The AD5111/AD5113/AD5115 wiper switch is designed with the transmission gate CMOS topology and with the gate voltage derived from VDD. RL RL RL RL RS W RS A B BS 5-BIT/6-BIT/7-BIT ADDRESS DECODER TS Figure 42. AD5111/AD5113/AD5115 Simplified RDAC Circuit Low Wiper Resistance Feature In addition, the AD5111/AD5113/AD5115 include a new feature to reduce the resistance between terminals. These extra steps are called bottom scale and top scale. At bottom scale, the typical wiper resistance decreases from 70 Ω to 45 Ω. At top scale, the resistance between Terminal A and Terminal W is decreased by 1 LSB and the total resistance is reduced to 70 Ω. The extra steps are not equal to 1 LSB and are not included in the INL, DNL, R-INL, and R-DNL specifications. PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation—±8% Resistor Tolerance The AD5111/AD5113/AD5115 operate in rheostat mode when only two terminals are used as a variable resistor. The unused terminal can be floating or tied to the W terminal as shown in Figure 43. A W B A W B A W B Figure 43. Rheostat Mode Configuration The nominal resistance between Terminal A and Terminal B, RAB, is available in 5 kΩ, 10 kΩ, and 80 kΩ and has 128/64/32 tap points accessed by the wiper terminal. The 5-/6-/7-bit data in the RDAC latch is decoded to select one of the 128/64/32 possible wiper settings. The general equations for determining the digitally programmed output resistance between the W terminal and B terminal are AD5111: BS WB R R Bottom scale (1) W AB WB R R D D R 128 ) ( From 0 to 128 (2) AD5113: BS WB R R Bottom scale (3) W AB WB R R D D R 64 ) ( From 0 to 64 (4) AD5115: BS WB R R Bottom scale (5) W AB WB R R D D R 32 ) ( From 0 to 32 (6) where: D is the decimal equivalent of the binary code in the 5-/6-/7-bit RDAC register; 128, 64, and 32 refer to the top scale step. RAB is the end-to-end resistance. RW is the wiper resistance. RBS is the wiper resistance at bottom scale. |
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