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EL8188FWZ-T7 Datasheet(PDF) 7 Page - Intersil Corporation |
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EL8188FWZ-T7 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN7467.3 February 22, 2007 Application Information Introduction The EL8188 is a rail-to-rail input and output (RRIO), micro- power, precision, single supply op amp with an enable feature. This amplifier is designed to operate from single supply (2.4V to 5.0V) or dual supply ( ±1.2V to ±2.5V) while drawing only 50µA of supply current.The device achieves rail-to-rail input and output operation while eliminating the drawbacks of many conventional RRIO op amps. Rail-to-Rail Input The PFET input stage of the EL8188 has an input common- mode voltage range that includes the negative and positive supplies without introducing offset errors or degrading performance like some existing rail-to-rail input op amps. Many rail-to-rail input stages use two differential input pairs: a long-tail PNP (or PFET) and an NPN (or NFET). Severe penalties result from using this topology. As the input signal moves from one supply rail to the other, the op amp switches from one input pair to the other causing drastic changes in input offset voltage and an undesired change in the input offset current’s magnitude and polarity. The EL8188 achieves rail-to-rail input performance without sacrificing important precision specifications and without degrading distortion performance. The EL8188's input offset voltage exhibits a smooth behavior throughout the entire common-mode input range. Rail-to-Rail Output A pair of complementary MOSFET devices achieves rail-to-rail output swing. The NMOS sinks current to swing the output in the negative direction, while the PMOS sources current to swing the output in the positive direction. The EL8188 with a 100k Ω load swings to within 3mV of the supply rails. Enable/Disable Feature The EL8188 features an active low ENABLE pin that when pulled up to at least 2V disables the output, and drops the already low ICC to a 3µA trickle. The ENABLE pin has an internal pull down, so an undriven pin pulls to the negative rail, thereby enabling the op amp by default. The high impedance output during disable allows for connecting multiple EL8188s together to implement a Mux Amp. The outputs are connected together and activating the appropriate ENABLE pin selects the desired channel. If utilizing non-unity gain op amp configurations, then the loading effects of the disabled amplifiers’ feedback networks must be considered when evaluating the active amplifier’s performance in Mux Amp configurations. Note that feedthrough from the IN+ to IN- pins occurs on any Mux Amp disabled channel where the input differential voltage exceeds 0.5V (e.g., active channel VOUT = 1V, while disabled channel VIN = GND), so the mux implementation is best suited for small signal applications. If large signals are required, use series IN+ resistors, or large value RFs, to keep the feedthrough current low enough to minimize the impact on the active channel. See the “Usage Implications” on page 8 for more details. Pin Descriptions SO PIN NUMBER SOT-23 PIN NUMBER PIN NAME EQUIVALENT CIRCUIT DESCRIPTION 1 NC No internal connection 2 4 IN- Circuit 1 Amplifier’s inverting input 3 3 IN+ Circuit 1 Amplifier’s non-inverting input 4 2 VS- Circuit 4 Negative power supply 5 NC No internal connection 6 1 OUT Circuit 3 Amplifier’s output 7 6 VS+ Circuit 4 Positive power supply 8 5 ENABLE Circuit 2 Amplifier’s enable pin with internal pull-down; Logic “1” selects the disabled state; Logic “0” selects the enabled state. ENABLE OUT CIRCUIT 3 CIRCUIT 2 CAPACITIVELY COUPLED ESD CLAMP CIRCUIT 4 VS+ VS+ VS+ VS- VS- VS- IN- VS+ VS- CIRCUIT 1 IN+ EL8188 |
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