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LT6656AIS6-2.5TRPBF Datasheet(PDF) 13 Page - Linear Technology |
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LT6656AIS6-2.5TRPBF Datasheet(HTML) 13 Page - Linear Technology |
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13 / 18 page  LT6656 6656fa 0.1µF 10µF LT6656-2.5 3V ≤ VIN ≤ 18V 6656 TA02 PB0/AIN0/AREF/MOSI MCU 5 PB1/INT0/AIN1/MISO/OC1A 6 PB2/ADC1/SCK/T0/INT0 7 PB3/ADC2 2 PB4/ADC3 3 PB5/RESET/ADC0 1 VCC/VREF GND OUT IN Typical applicaTions Regulator Reference The robust input and output of the LT6656 along with its high output current make it an excellent precision low power regulator as well as a reference. The LT6656 would be a good match with a small, low power microcontroller. Using the LT6656 as a regulator reduces power consump- tion, decreases solution size and increases the accuracy of the microcontroller’s on board ADC. Figure 12. Microcontroller Reference and Regulator Low Power ADC Reference Low power ADCs draw only a few µAs during their idle period and well over 100µA during conversions. Despite these surges of current, the ADC in reality can have very low power consumption. Figure 13 shows the LTC2480, a low power delta sigma ADC. When the ADC is disabled its quiescentcurrent(IQ)isroughly1µA,duringconversionthe IQ jumps up to 160µA. In reality, the power consumption is not only based on the IQ during conversion, but the real power consumption of the ADC is set by the conversion time and the sample rate. The LTC2480 shown in Figure 13 has a conversion time of 160ms which sets the maximum samplerateof6samplespersecond.Themaximumsample ratealsosetsthemaximumcurrentconsumptionto160µA, but at slower sample rates the ADC will have significantly lower average current draw. If the ADC is sampled at 1 sample per second the average current drawn by the ADC during a 1 second interval would only be 26.4µA. When taking into consideration the current drawn by the refer- ence, the total current draw is only 27.4µA. This system is greatlysimplifiedbecausetheprecisionreferencedoesnot need to be cycled on and off to save power. Furthermore, leaving the reference on continuously eliminates concern for turn-on settling time. Figure 13. Low Power ADC Reference 0.1µF 5.1V ≤ VIN ≤ 18V 4.7µF 6656 TA05 DIFFERENTIAL INPUT ±VREF • 0.5 (±2.5V) AT 1sps, IQ = 27.4µA LT6656-5 IN OUT SDO IN– CS SCK IN+ LTC2480 VCC REF |
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