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CAT5271 Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT5271 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 14 page CAT5271, CAT5273 http://onsemi.com 8 Table 9. CODES AND CORRESPONDING RWA RESISTANCE FOR RAB = 100 kW, VDD = 5 V D (Dec.) RWA (W) Output State 255 441 Full Scale 128 50,050 Midscale 1 99,659 1 LSB 0 100,050 Zero Scale Typical device to device resistance matching is lot dependent and may vary by up to 20%. ESD Protection GND LOGIC Digital Input GND Potentiometer Figure 15. ESD Protection Networks W, A, B Terminal Voltage Operating Range The CAT5271/CAT5273 VDD and GND power supply define the limits for proper 3-terminal digital potentiometer operation. Signals or potentials applied to terminals A, B or the wiper must remain inside the span of VDD and GND. Signals which attempt to go outside these boundaries will be clamped by the internal forward biased diodes. W, A, B CAT5271 LOGIC GND Figure 16. VDD Power-up Sequence Because ESD protection diodes limit the voltage compliance at terminals A, B, and W (see Figure 15), it is recommended that VDD/GND be powered before applying any voltage to terminals A, B, and W. The ideal power-up sequence is: GND, VDD, digital inputs, and then VA/B/W. The order of powering VA, VB, VW, and the digital inputs is not important as long as they are powered after VDD/GND. Power Supply Bypassing Good design practice employs compact, minimum lead length layout design. Leads should be as direct as possible. It is also recommended to bypass the power supplies with quality low ESR Ceramic chip capacitors of 0.01 mF to 0.1 mF. Low ESR 1 mF to 10 mF tantalum or electrolytic capacitors can also be applied at the supplies to suppress transient disturbances and low frequency ripple. As a further precaution digital ground should be joined remotely to the analog ground at one point to minimize the ground bounce. CAT5271 GND + 10 mF 0.1 mF Figure 17. Power Supply Bypassing VDD VDD C3 C1 |
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Similar Description - CAT5271 |
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