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AD5241 데이터시트(PDF) 11 Page - Analog Devices |
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AD5241 데이터시트(HTML) 11 Page - Analog Devices |
11 / 16 page REV. B AD5200/AD5201 –11– CODE – Decimal 100.0 10.0 0.1 032 1.0 64 96 128 160 192 224 256 RAB = 10k RAB = 50k TPC 31. AD5200 I MAX vs. Code CODE – Decimal 100.0 10.0 0.1 04 1.0 812 16 20 24 28 32 RAB = 10k RAB = 50k TPC 32. AD5201 I MAX vs. Code OPERATION The AD5200/AD5201 provide 255 and 33 positions digitally- controlled variable resistor (VR) devices. Changing the programmed VR settings is accomplished by clocking in an 8-bit serial data word for AD5200, and a 6-bit serial data word for AD5201, into the SDI (Serial Data Input) pins. Table I provides the serial register data word format. The AD5200/AD5201 are preset to a midscale internally during power-on condition. In addition, the AD5200/AD5201 contain power shutdown SHDN pins that place the RDAC in a zero power consump- tion state where the immediate switches next to Terminals A and B are open-circuited. Meanwhile, the wiper W is connected to B terminal, resulting in only leakage current consumption in the VR structure. During shutdown, the VR latch contents are maintained when the RDAC is inactive. When the part is returned from shutdown, the stored VR setting will be applied to the RDAC. Table I. AD5200 Serial-Data Word Format 7 B6 B5 B4 B3 B2 B1 B0 B 7 D6 D5 D4 D3 D2 D1 D0 D B S MB S L 27 20 Table II. AD5201 Serial-Data Word Format 5 B * 4 B3 B2 B1 B0 B 5 D * 4 D3 D2 D1 D0 D B S MB S L 25 20 *Six data bits are needed for 33 positions. PROGRAMMING THE VARIABLE RESISTOR Rheostat Operation The nominal resistance of the RDAC between Terminals A and B are available with values of 10 k Ω and 50 kΩ. The final two digits of the part number determine the nominal resistance value, e.g., 10 k Ω = 10 and 50 kΩ = 50. The nominal resistance (RAB) of AD5200 has 256 contact points accessed by the wiper terminal. The 8-bit data word in the RDAC latch of AD5200 is decoded to select one of the 256 possible settings. In both parts, the wiper’s first connection starts at the B terminal for data 00H. This B-terminal connection has a wiper contact resistance of 50 Ω as long as valid V DD/VSS is applied, regardless of the nominal resistance. For a 10 k Ω part, the second connection of AD5200 is the first tap point with 89 Ω [RWB = RAB/255 + RW = 39 Ω + 50 Ω] for data 01H. The third connection is the next tap point representing 78 + 50 = 128 Ω for data 02H. Due to its unique internal structure, AD5201 has 5-bit + 1 resolution, but needs a 6-bit data word to achieve the full 33 steps resolution. The 6-bit data word in the RDAC latch is decoded to select one of the 33 possible settings. Data 34 to 63 will automatically be equal to Position 33. The wiper 00H connection of AD5201 gives 50 Ω. Similarly, for a 10 k Ω part, the first tap point of AD5201 yields 363 Ω for data 01H, 675 Ω for data 02H. For both AD5200 and AD5201, each LSB data value increase moves the wiper up the resistor ladder until the last tap point is reached. Figures 2a and 2b show the simplified diagrams of the equivalent RDAC circuits. |
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