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ISL28230CBZ データシート(PDF) 11 Page - Intersil Corporation |
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ISL28230CBZ データシート(HTML) 11 Page - Intersil Corporation |
11 / 19 page ISL28130, ISL28230, ISL28430 11 Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com FN7623.7 February 13, 2014 For additional products, see www.intersil.com/en/products.html Applications Information Functional Description The ISL28130, ISL28230 and ISL28430 are low offset and low drift operational amplifiers with a very high open loop gain (150dB) and rail-to-rail input/output. They are designed to operate on a single supply range of 1.8V to 5.5V or a dual supply range of ±0.9V to ±2.75V while consuming only 20µA of supply current per channel. The ISL28130, ISL28230 and ISL28430 have a 400kHz gain-bandwidth. The high open loop gain, low offset voltage, high bandwidth and low 1/f noise make the ISL28130, ISL28230 and ISL28430 ideal for precision applications. Rail-to-rail Input and Output (RRIO) The RRIO CMOS amplifier uses parallel input PMOS and NMOS that enable the inputs to swing 100mV beyond either supply rail. The inverting and non-inverting inputs do not have back-to-back input clamp diodes and are capable of maintaining high input impedance at high differential input voltages. This is effective in eliminating output distortion caused by high slew rate input signals. The output stage uses common source connected PMOS and NMOS devices to achieve rail-to-rail output drive capability with 15mA current limit and the capability to swing to within 50mV of either rail while driving a 10kΩ load. IN+ and IN- Protection All input terminals have internal ESD protection diodes to both positive and negative supply rails, limiting the input voltage to within one diode beyond the supply rails. For applications in which either input is expected to exceed the rails by 0.5V, an external series resistor must be used to ensure the input currents never exceed 20mA (see Figure 23). Layout Guidelines for High Impedance Inputs To achieve maximum performance from the high input impedance and low offset voltage of the ISL28130, ISL28230 and ISL28430 amplifiers, care should be taken in the circuit board layout. The PC board surface must remain clean and free of moisture to avoid leakage currents between adjacent traces. Surface coating of the circuit board reduces surface moisture and provides a humidity barrier, reducing parasitic resistance on the board. High Gain, Precision DC-Coupled Amplifier The circuit in Figure 24 implements a single-stage DC-coupled amplifier with an input DC sensitivity of under 100nV that is only possible using a low VOS amplifier with high open loop gain. High gain DC amplifiers operating from low voltage supplies are not practical using typical low offset precision op amps. For example, consider a typical precision amplifier in a gain of 10kV/V. A low offset op amp with ±100µV VOS and 0.5µV/°C offset drift yields a DC error of >1V, with an additional 5mV/°C of temperature-dependent error. This amount of error makes it difficult to resolve DC input voltage changes in the mV range. The ±40µV max VOS and 150nV/°C temperature drift of the ISL28130, ISL28230, and ISL28430 produce a temperature-stable maximum DC output error of only ±400mV, with a maximum output temperature drift of 1.5mV/°C. The additional benefit of a very low 1/f noise corner frequency and some feedback filtering allows DC voltages and voltage fluctuations well below 10µV to be easily detected with a simple, single-stage amplifier. FIGURE 23. INPUT CURRENT LIMITING - + RIN RL VIN VOUT FIGURE 24. HIGH GAIN, PRECISION DC-COUPLED AMPLIFIER - + 100Ω RL VIN VOUT 1MΩ 1MΩ 100Ω -2.5V +2.5V ACL = 10kV/V CF 0.018µF |
同様の部品番号 - ISL28230CBZ |
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同様の説明 - ISL28230CBZ |
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