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ISL28138FBZ-T7 データシート(PDF) 11 Page - Intersil Corporation |
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ISL28138FBZ-T7 データシート(HTML) 11 Page - Intersil Corporation |
11 / 16 page 11 FN6336.2 February 19, 2008 Applications Information Introduction The ISL28138 and ISL28238 are single and dual channel CMOS rail-to-rail input, output (RRIO) micropower precision operational amplifiers. The parts are designed to operate from single supply (2.4V to 5.5V) or dual supply (±1.2V to ±2.75V). The parts have an input common mode range that extends 0.25V above the positive rail and 100mV below the the negative supply rail. The output operation can swing within about 3mV of the supply rails with a 100k Ω load. Rail-to-Rail Input 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 ISL28138 and ISL28238 achieve input rail-to-rail operation 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 100mV below the negative rail and 0.25V higher than the V+ rail. Pin Descriptions ISL28138 (6 Ld SOT-23) ISL28138 (8 Ld SOIC) ISL28238 (8 Ld SOIC) (8 Ld MSOP) PIN NAME FUNCTION EQUIVALENT CIRCUIT 1, 5 NC Not connected 42 2 (A) 6 (B) IN- IN-_A IN-_B inverting input Circuit 1 33 3 (A) 5 (B) IN+ IN+_A IN+_B Non-inverting input (See circuit 1) 2 4 4 V- Negative supply Circuit 2 16 1 (A) 7 (B) OUT OUT_A OUT_B Output Circuit 3 6 7 8 V+ Positive supply (See circuit 2) 58 EN Chip enable Circuit 4 IN- V+ V- IN+ V+ V- CAPACITIVELY COUPLED ESD CLAMP V+ V- OUT V+ V- EN ISL28138, ISL28238 |
同様の部品番号 - ISL28138FBZ-T7 |
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同様の説明 - ISL28138FBZ-T7 |
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