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EL8178FWZ-T7 Datasheet(PDF) 10 Page - Intersil Corporation |
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EL8178FWZ-T7 Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 15 page 10 FN7504.6 March 17, 2008 Application Information Introduction The EL8178 is a rail-to-rail input and output (RRIO), micropower, precision, single supply op amp with an enable feature. This amplifier is designed to operate from single supply (2.4V to 5.5V) or dual supply (±1.2V to ±2.75V) while drawing only 55µA 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 EL8178 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 changes in input offset voltage and an undesired change in the input offset current’s magnitude and polarity. The EL8178 achieves rail-to-rail input performance without sacrificing important precision specifications and without degrading distortion performance. The EL8178'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 achieve 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 EL8178 with a 100k Ω load swings to within 3mV of the supply rails. Results of Overdriving the Output Caution should be used when overdriving the output for long periods of time. Overdriving the output can occur in three ways: 1. The input voltage times the gain of the amplifier exceeds the supply voltage by a large value. 2. The output current required is higher than the output stage can deliver. 3. Operating the device in slew rate limit. These conditions can result in a shift in the Input Offset Voltage (VOS) as much as 1µV/hr of exposure under these conditions. Enable/Disable Feature The EL8178 features an active low EN pin that when pulled up to at least 2V, disables the output and drops the ICC to a 3µA. The EN pin has an internal pull-down, so an undriven pin pulls to the negative rail, thereby enabling the op amp by default. For applications where the EN pin is not being used, it is recommended that the EN pin be permanently tyed to ground. The high impedance output during disable allows for connecting multiple EL8178s together to implement a Mux Amp. The outputs are connected together and activating the appropriate EN pin selects the desired channel. If utilizing non-unity gain op amp configurations, then the loading Pin Descriptions SO PIN NUMBER SOT-23 PIN NUMBER 6 Ld WLCSP PIN NUMBER PIN NAME EQUIVALENT CIRCUIT DESCRIPTION 1 A1 NC No internal connection 2 4 C1 IN- Circuit 1 Amplifier’s inverting input 3 3 C2 IN+ Circuit 1 Amplifier’s non-inverting input 4 2 B2 V- Circuit 4 Negative power supply 5 NC No internal connection 6 1 A2 OUT Circuit 3 Amplifier’s output 7 6 B1 V+ Circuit 4 Positive power supply 85 EN Circuit 2 Amplifier’s enable pin with internal pull-down; Logic “1” selects the disabled state; Logic “0” selects the enabled state. EN OUT CIRCUIT 3 CIRCUIT 2 CAPACITIVELY COUPLED ESD CLAMP CIRCUIT 4 V+ V+ V+ V- V- V- IN- V+ V- CIRCUIT 1 IN+ EL8178 |
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