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ISL28276IAZ датащи(PDF) 10 Page - Intersil Corporation |
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ISL28276IAZ датащи(HTML) 10 Page - Intersil Corporation |
10 / 12 page 10 FN6301.0 June 23, 2006 Pin Descriptions Applications Information Introduction The ISL28276 is an enhanced rail-to-rail input micropower precision operational amplifiers with an enable feature. The part is designed to operate from single supply (2.4V to 5.0V) or dual supply ( ±1.2V to ±2.5V). The device is capable of swinging 0.5V above a 5.0V supply (0.25V for a 2.4V supply) and to within 10mV from ground. The ISL28276 maintains CMRR performance for input voltages greater than the positive supply. The output operation can swing within about 3mV of the supply rails with a 100k Ω load (reference Figures 29 through 32). Rail-to-Rail Input The input common-mode voltage range of the ISL28276 goes from negative supply to positive supply without introducing additional offset errors or degrading performance associated with a conventional rail-to-rail input operational amplifier. Many rail-to-rail input stages use two differential input pairs, a long-tail PNP (or PFET) and an NPN (or NFET). Severe penalties have to be paid for this circuit topology. As the input signal moves from one supply rail to another, the operational amplifier switches from one input pair to the other causing drastic changes in input offset voltage and an undesired change in magnitude and polarity of input offset current. The ISL28276 achieves input rail-to-rail without sacrificing important precision specifications and degrading distortion performance. The devices’ input offset voltage exhibits a smooth behavior throughout the entire common-mode input range. The input bias current versus the common-mode voltage range gives us an undistorted behavior from typically 10mV above the negative rail and 10% higher than the V+ rail (0.5V higher than V+ when V+ equals 5v). ISL28276 (16 LD QSOP) PIN NAME EQUIVALENT CIRCUIT DESCRIPTION 1 NC No internal connection 2 NC No internal connection 3 OUT_A Circuit 3 Amplifier A output 4 IN-_A Circuit 1 Amplifier A inverting input 5 IN+_A Circuit 1 Amplifier A non-inverting input 6EN_A Circuit 2 Amplifier A enable pin internal pull-down; Logic “1” selects the disabled state; Logic “0” selects the enabled state. 7 V- Circuit 4 Negative power supply 8 NC No internal connection 9 NC No internal connection 10 NC No internal connection 11 EN_B Circuit 2 Amplifier B enable pin with internal pull-down; Logic “1” selects the disabled state; Logic “0” selects the enabled state. 12 IN+_B Circuit 1 Amplifier B non-inverting input 13 IN-_B Circuit 1 Amplifier B inverting input 14 OUT_B Circuit 3 Amplifier B output 15 V+ Circuit 4 Positive power supply 16 NC No internal connection IN- V+ V- LOGIC PIN V+ V- V+ V- OUT CIRCUIT 3 CIRCUIT 1 CIRCUIT 2 IN+ V+ V- CAPACITIVELY COUPLED ESD CLAMP CIRCUIT 4 ISL28276 |
Аналогичный номер детали - ISL28276IAZ |
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Аналогичное описание - ISL28276IAZ |
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