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OPA4340MDREP Datasheet(PDF) 9 Page - Texas Instruments |
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OPA4340MDREP Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 17 page  APPLICATION INFORMATION Rail-to-Rail Input V =+5,G=+1,R =10kW S L 5 5 0 V IN V OUT Operating Voltage OPA340-EP OPA2340-EP OPA4340-EP www.ti.com ................................................................................................................................................................................................ SBOS433 – AUGUST 2008 apply from –55°C to 125°C. Most behavior remains OPA340 series operational amplifiers are fabricated nearly unchanged throughout the full operating on a state-of-the-art 0.6-micron CMOS process. They voltage range. Parameters that vary significantly with are unity-gain stable and suitable for a wide range of operating voltages or temperature are shown in general-purpose applications. Rail-to-rail input/output Typical Characteristics. make them ideal for driving sampling A/D converters. In addition, excellent ac performance makes them well-suited for audio applications. The class AB output stage is capable of driving 600- Ω loads The input common-mode voltage range of the connected to any point between V+ and ground. OPA340 series extends 500 mV beyond the supply rails. This is achieved with a complementary input Rail-to-rail input and output swing significantly stage—an N-channel input differential pair in parallel increases dynamic range, especially in low-supply with a P-channel differential pair (as shown in applications. Figure 23 shows the input and output Figure 24). The N-channel pair is active for input waveforms for the OPA340 in unity-gain voltages close to the positive rail, typically configuration. Operation is from a single 5-V supply (V+) – 1.3 V to 500 mV above the positive supply, with a 10-k Ω load connected to VS/2. The input is a while the P-channel pair is on for inputs from 500 mV 5-VPP sinusoid. Output voltage is approximately below the negative supply to approximately 4.98 VPP. (V+) – 1.3 V. There is a small transition region, typically (V+) – 1.5 V to (V+) – 1.1 V, in which both Power-supply pins should be bypassed with 0.01- µF pairs are on. This 400-mV transition region can vary ceramic capacitors. ±300 mV with process variation. Thus, the transition region (both stages on) can range from (V+) – 1.8 V to (V+) – 1.4 V on the low end, up to (V+) – 1.2 V to (V+) – 0.8 V on the high end. OPA340 series operational amplifiers are laser-trimmed to reduce the offset voltage difference between the N-channel and P-channel input stages, resulting in improved common-mode rejection and a smooth transition between the N-channel pair and the P-channel pair. However, within the 400-mV transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation outside this region. A double-folded cascode adds the signal from the two input pairs and presents a differential signal to the Figure 23. Rail-to-Rail Input and Output class AB output stage. Normally, input bias current is approximately 200 fA; however, input voltages exceeding the power supplies by more than 500 mV can cause excessive current to flow in or out of the OPA340 series operational amplifiers are fully input pins. Momentary voltages greater than 500 mV specified from 2.7 V to 5 V. Parameters are ensured beyond the power supply can be tolerated if the over the specified supply range—a unique feature of current on the input pins is limited to 10 mA. This is the OPA340 series. In addition, many specifications easily accomplished with an input resistor, as shown in Figure 25. Many input signals are inherently current-limited to less than 10 mA; therefore, a limiting resistor is not required. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): OPA340-EP OPA2340-EP OPA4340-EP |
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