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OP2177ARM データシート(PDF) 10 Page - Analog Devices |
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OP2177ARM データシート(HTML) 10 Page - Analog Devices |
10 / 20 page REV. B OP1177/OP2177/OP4177 –10– FUNCTIONAL DESCRIPTION OP1177 is the fourth generation of ADI’s industry standard OP07 amplifier family. OP1177 is a very high-precision, low-noise opera- tional amplifier with the highly desirable combination of extremely low offset voltage and very low input bias currents. Unlike JFET amplifiers, the low bias and offset currents are relatively insensitive to ambient temperatures, even up to 125 °C. For the first time, Analog Devices’ proprietary process technology and linear design expertise have produced a high-voltage amplifier with superior performance to the OP07, OP77, and OP177 in a tiny MSOP 8-lead package. Despite its small size the OP1177 offers numerous improvements including low wide- band noise, very wide input and output voltage range, lower input bias current, and complete freedom from phase inversion. OP1177 has the widest specified operating temperature range of any similar device in a plastic surface-mount package. This is increasingly important as PC board and overall system sizes continue to shrink, causing internal system temperatures to rise. Power consumption is reduced by a factor of four from the OP177 while bandwidth and slew rate increase by a factor of two. The low power dissipation and very stable performance versus temperature also act to reduce warm-up drift errors to insignificant levels. Open-loop gain linearity under heavy loads is superior to competitive parts like OPA277, improving dc accuracy and reducing distortion in circuits with high closed-loop gains. Inputs are internally protected from overvoltage conditions referenced to either supply rail. Like any high-performance amplifier, maximum performance is achieved by following appropriate circuit and PC board guidelines. The following sections provide practical advice on getting the most out of the OP1177 under a variety of application conditions. Total Noise Including Source Resistors The low input current noise and input bias current of the OP1177 make it useful for circuits with substantial input source resistance. Input offset voltage increases by less than 1 µV max per 500 Ω of source resistance. The total noise density of the OP1177 is: e e i R kTR n TOTAL nn S S , =+ () + 2 2 4 Where, en is the input voltage noise density in is the input current noise density RS is the source resistance at the noninverting terminal k is Boltzman’s constant (1.38 10 –23 J/K) T is the ambient temperature in Kelvin (T = 273 + °C) For RS < 3.9 k Ω, en dominates and ee n TOTAL n , ≈ For 3.9 k Ω < RS < 412 kΩ, voltage noise of the amplifier, current noise of the amplifier translated through the source resistor, and thermal noise from the source resistor all contribute to the total noise. For RS > 412 k Ω, the current noise dominates and ei R n TOTAL n S , ≈ The total equivalent rms noise over a specific bandwidth is expressed as: Ee BW n n TOTAL = () , Where BW is the bandwidth in Hertz. NOTE: The above analysis is valid for frequencies larger than 50 Hz. When considering lower frequencies, flicker noise (also known as 1/f noise) must be taken into account. For a reference on noise calculations refer to Bandpass KRC or Sallen-Key Filter section. Gain Linearity Gain linearity reduces errors in closed-loop configurations. The straighter the gain curve, the lower the maximum error over the input signal range will be. This is especially true for circuits with high closed-loop gains. The OP1177 has excellent gain linearity even with heavy loads, shown in Figure 1. Compare its performance to the OPA277, shown in Figure 2. Both devices were measured under identical conditions with RL = 2 k Ω. The OP2177 (dual) has virtually no distortion at lower voltages. It was compared to the OPA277 at several supply voltages and various loads. Its performance exceeded that of its counterpart by far. SCALE – V VSY = 15V RL = 2k OP1177 Figure 1. Gain Linearity SCALE – V VSY = 15V RL = 2k OPA277 Figure 2. Gain Linearity Input Overvoltage Protection When their input voltage exceeds the positive or negative supply voltage, most amplifiers require external resistors to protect them from damage. The OP1177 has internal protective circuitry that allows volt- ages as high as 2.5 V beyond the supplies to be applied at the input of either terminal without any harmful effects. |
同様の部品番号 - OP2177ARM |
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同様の説明 - OP2177ARM |
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