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ISL28236FUZ-T7 Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL28236FUZ-T7 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 FN6921.0 June 18, 2009 Applications Information Introduction The ISL28236 is a dual channel Bi-CMOS rail-to-rail input, output (RRIO) micropower precision operational amplifier. The part is designed to operate from single supply (2.4V to 5.5V) or dual supply (±1.2V to ±2.75V). The ISL28236 has an input common mode range that extends 0.25V above the positive rail and down to 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. Thus causing drastic changes in input offset voltage and an undesired change in magnitude and polarity of input offset current. The ISL28236 solves this problem using an internal charge-pump to provide a voltage boost to the V+ supply rail driving the input differential pair. This results in extending the input common voltage rails to 0.25V beyond the V+ positive rail. The input offset voltage exhibits a smooth behavior throughout the extended common-mode input range. The input bias current versus the common-mode voltage range gives an undistorted behavior from the negative rail to 0.25V higher than the positive rail. Power Supply Decoupling The internal charge pump operates at approximately 27MHz and oscillator ripple doesn’t show up in the 5MHz bandwidth of the amplifier. Good power supply decoupling with 0.01µF capacitors at each device power supply pin, is the most effective way to reduce oscillator ripple at the amplifier output. Figure 36 shows the electrical connection of these capacitors using split power supplies. For single supply operation with V- tied to a ground plane, only a single 0.01µF capacitor from V+ is needed. When multiple ISL28236 op amps are used on a single PC board, each op amp will require a 0.01µF decoupling capacitor at each supply pin Rail-to-Rail Output The rail-rail output stage uses CMOS devices that typically swing to within 3mV of the supply rails with a 100k Ω load. The NMOS sinks current to swing the output in the negative direction. The PMOS sources current to swing the output in the positive direction. Pin Descriptions ISL28236 (8 Ld SOIC) (8 Ld MSOP) PIN NAME FUNCTION EQUIVALENT CIRCUIT 2 (A) 6 (B) IN- IN-_A IN-_B inverting input Circuit 1 3 (A) 5 (B) IN+ IN+_A IN+_B Non-inverting input See Circuit 1 4 V- Negative supply Circuit 2 1 (A) 7 (B) OUT OUT_A OUT_B Output Circuit 3 8 V+ Positive supply See Circuit 2 IN+ IN- V+ V- V+ V- CAPACITIVELY COUPLED ESD CLAMP V+ V- OUT ISL28236 |
Similar Part No. - ISL28236FUZ-T7 |
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Similar Description - ISL28236FUZ-T7 |
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