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ISL60007CIB825Z Fiches technique(PDF) 6 Page - Intersil Corporation |
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ISL60007CIB825Z Fiches technique(HTML) 6 Page - Intersil Corporation |
6 / 10 page 6 FN8087.3 April 21, 2006 Applications Information FGA Technology The ISL60007 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 ISL60007 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 ISL60007 consumes extremely low supply current due to the proprietary FGA technology. Supply current at room temperature is typically 400nA 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 15. Data acquisition circuits providing 12 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. FIGURE 13. ZOUT vs f vs CL FIGURE 14. VOUT NOISE Typical Performance Curves, 2.5V Reference VIN = 3.0V, IOUT = 0mA, TA = 25°C Unless Otherwise Specified (Continued) 0 20 40 60 80 100 120 140 1 10 100 1k 10k 100k FREQUENCY (Hz) NO 1nF LOAD LOAD 10nF LOAD 100nF LOAD 10s/DIV VIN = +3.0V 0.001µF-0.01µF SERIAL BUS VIN VOUT GND ISL60007 REF IN ENABLE SCK SDAT A/D CONVERTER 12 TO 24-BIT 0.01µF 10µF FIGURE 15. ISL60007 |
Numéro de pièce similaire - ISL60007CIB825Z |
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Description similaire - ISL60007CIB825Z |
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