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ISL21009DFB825Z Scheda tecnica(PDF) 9 Page - Intersil Corporation |
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ISL21009DFB825Z Scheda tecnica(HTML) 9 Page - Intersil Corporation |
9 / 13 page 9 FN6327.1 February 14, 2007 Applications Information FGA Technology The ISL21009 voltage reference uses 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. Micropower Operation The ISL21009 consumes extremely low supply current due to the proprietary FGA technology. Low noise performance is achieved using optimized biasing techniques. Supply current is typically 95µA and noise is 4µVP-P benefitting precision, low noise portable applications such as handheld meters and instruments. FIGURE 27. VOUT NOISE, 0.1Hz to 10Hz FIGURE 28. LOAD TRANSIENT RESPONSE FIGURE 29. LOAD TRANSIENT RESPONSE Typical Performance Curves (ISL21009-50) (R EXT = 100kΩ) (Continued) GAIN IS x1000, NOISE IS 4µVp-p -50µA 50µA 7mA -7mA ISL21009 |
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