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ISL28488FAZ-T7 数据表(PDF) 10 Page - Intersil Corporation |
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ISL28488FAZ-T7 数据表(HTML) 10 Page - Intersil Corporation |
10 / 13 page 10 FN6339.1 June 28, 2007 Applications Information Introduction The ISL28288 and ISL28488 are dual and quad CMOS rail-to-rail input, output (RRIO) micropower operational amplifiers. These devices are designed to operate from a single supply (2.4V to 5.0V) or dual supplies (±1.2V to ±2.5V) while drawing only 120 μA of supply current. This combination of low power and precision performance makes these devices suitable for solar and battery power applications. 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 ISL28288 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 100mV below the negative rail and 10% higher than the V+ rail (0.5V higher than V+ when V+ equals 5V). Input 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. There is an additional pair of back-to-back diodes across the input terminals. For applications where the input differential voltage is expected to exceed 0.5V, external series resistors must be used to ensure the input currents never exceed 5mA. Rail-to-Rail Output A pair of complementary MOSFET devices are used to achieve the rail-to-rail output swing. The NMOS sinks current to swing the output in the negative direction. The PMOS sources current to swing the output in the positive direction. The ISL28288 with a 100k Ω load will swing to within 4mV of the positive supply rail and within 3mV of the negative supply rail. Enable/Disable Feature The ISL28288 offers an EN pin that disables the device when pulled up to at least 2.0V. In the disabled state (output in a high impedance state), the part consumes typically 4µA. By disabling the part, multiple ISL28288 parts can be connected together as a MUX. In this configuration, the outputs are tied together in parallel and a channel can be selected by the EN pin. The loading effects of the feedback resistors of the disabled amplifier must be considered when multiple amplifier outputs are connected together. The EN pin also has an internal pull down. If left open, the EN pin will pull to the negative rail and the device will be enabled by default. Using Only One Channel The ISL28288 is a dual op amp. If the application only requires one channel, the user must configure the unused channel to prevent it from oscillating. The unused channel will oscillate if the input and output pins are floating. This will result in higher than expected supply currents and possible 10 OUT_C Circuit 3 Amplifier C output 11 IN-_C Circuit 1 Amplifier C inverting input 12 IN+_C Circuit 1 Amplifier C non-inverting input 14 IN+_D Circuit 1 Amplifier D non-inverting input 15 IN-_D Circuit 1 Amplifier D inverting input 16 OUT_D Circuit 3 Amplifier D output 8, 9 NC - No internal connection Pin Descriptions (Continued) ISL28288 (10 LD MSOP) ISL28488 (16 LD QSOP) PIN NAME EQUIVALENT CIRCUIT DESCRIPTION LOGIC PIN V+ V- V+ V- OUT CIRCUIT 3 CIRCUIT 1 CIRCUIT 2 V+ V- CIRCUIT 4 IN- V+ V- IN+ CAPACITIVELY COUPLED ESD CLAMP ISL28288, ISL28488 |
类似零件编号 - ISL28488FAZ-T7 |
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类似说明 - ISL28488FAZ-T7 |
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