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ISL21080DIH312Z-TK Arkusz danych(PDF) 11 Page - Intersil Corporation |
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ISL21080DIH312Z-TK Arkusz danych(HTML) 11 Page - Intersil Corporation |
11 / 17 page 11 FN6934.2 October 14, 2009 Applications Information FGA Technology The ISL21080 series of voltage references use the floating gate technology to create references with very low drift and supply current. Essentially, the charge stored on a floating gate cell is set precisely in manufacturing. The reference voltage output itself is a buffered version of the floating gate voltage. The resulting reference device has excellent characteristics which are unique in the industry: very low temperature drift, high initial accuracy, and almost zero supply current. Also, the reference voltage itself is not limited by voltage bandgaps or zener settings, so a wide range of reference voltages can be programmed (standard voltage settings are provided, but customer-specific voltages are available). The process used for these reference devices is a floating gate CMOS process, and the amplifier circuitry uses CMOS transistors for amplifier and output transistor circuitry. While providing excellent accuracy, there are limitations in output noise level and load regulation due to the MOS device characteristics. These limitations are addressed with circuit techniques discussed in other sections. Nanopower Operation Reference devices achieve their highest accuracy when powered up continuously, and after initial stabilization has taken place. This drift can be eliminated by leaving the power on continuously. The ISL21080 is the first high precision voltage reference with ultra low power consumption that makes it possible to leave power on continuously in battery operated circuits. The ISL21080 consumes extremely low supply current due to the proprietary FGA technology. Supply current at room temperature is typically 350nA, which is 1 to 2 orders of magnitude lower than competitive devices. Application circuits using battery power will benefit greatly from having an accurate, stable reference, which essentially presents no load to the battery. In particular, battery powered data converter circuits that would normally require the entire circuit to be disabled when not in use can remain powered up between conversions as shown in Figure 17. Data acquisition circuits providing 12 bits to 24 bits of accuracy can operate with the reference device continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. Other reference devices consuming higher supply currents will need to be disabled in between conversions to conserve battery capacity. Absolute accuracy will suffer as the device is biased and requires time to settle to its final value, or, may not actually settle to a final value as power on time may be short. Table 1 shows an example of battery life in years for ISL21080 in various power on condition with 1.5µA maximum current consumption. High Current Application FIGURE 15. DIFFERENT VIN AT ROOM TEMPERATURE FIGURE 16. DIFFERENT VIN AT HIGH TEMPERATURE (+85°C) 1.492 1.494 1.496 1.498 1.500 1.502 0 5 10 15 20 25 30 ILOAD (mA) 35 VIN = 5V VIN = 3.3V VIN = 3.5V 1.492 1.494 1.496 1.498 1.500 1.502 0 5 10 15 20 25 30 ILOAD (mA) VIN = 5V VIN = 3.5V VIN = 3.3V 35 TABLE 1. EXAMPLE OF BATTERY LIFE IN YEARS FOR ISL21080 IN VARIOUS POWER ON CONDITIONS WITH 1.5µA MAX CURRENT BATTERY RATING (mAH) CONTINUOUS 50% DUTY CYCLE 10% DUTY CYCLE 40 3 6 30* 225 16.3* 32.6* 163* NOTE: *Typical Li-ion battery has a shelf life of up to 10 years. ISL21080 |
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