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OPA2340UA Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA2340UA Datasheet(HTML) 8 Page - Burr-Brown (TI) |
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8 / 20 page  8 ® OPA340/2340/4340 APPLICATIONS INFORMATION OPA340 series op amps are fabricated on a state-of-the-art 0.6 micron CMOS process. They are unity-gain stable and suitable for a wide range of general purpose applications. Rail-to-rail input/output make them ideal for driving sam- pling 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 connected to any point between V+ and ground. Rail-to-rail input and output swing significantly increases dynamic range, especially in low supply applications. Figure 1 shows the input and output waveforms for the OPA340 in unity-gain configuration. Operation is from a single +5V supply with a 10k Ω load connected to V S /2. The input is a 5Vp-p sinusoid. Output voltage is approxi- mately 4.98Vp-p. Power supply pins should be bypassed with 0.01 µF ceramic capacitors. OPERATING VOLTAGE OPA340 series op amps are fully specified from +2.7V to +5V. However, supply voltage may range from +2.5V to +5.5V. Parameters are guaranteed over the specified supply range—a unique feature of the OPA340 series. In addition, many specifications apply from –40 °C to +85°C. Most behavior remains virtually unchanged throughout the full operating voltage range. Parameters which vary signifi- cantly with operating voltages or temperature are shown in the typical performance curves. RAIL-TO-RAIL INPUT The input common-mode voltage range of the OPA340 series extends 500mV beyond the supply rails. This is achieved with a complementary input stage—an N-channel input differential pair in parallel with a P-channel differen- tial pair (see Figure 2). The N-channel pair is active for input voltages close to the positive rail, typically (V+) –1.3V to 500mV above the positive supply, while the P-channel pair is on for inputs from 500mV below the negative supply to approximately (V+) –1.3V. There is a small transition region, typically (V+) –1.5V to (V+) –1.1V, in which both pairs are on. This 400mV transition region can vary ±300mV with process variation. Thus, the transi- tion region (both stages on) can range from (V+) –1.8V to (V+) –1.4V on the low end, up to (V+) –1.2V to (V+) –0.8V on the high end. FIGURE 2. Simplified Schematic. V S = +5, G = +1, RL = 10kΩ VIN FIGURE 1. Rail-to-Rail Input and Output. V BIAS1 V BIAS2 V IN+ V IN– Class AB Control Circuitry V O V– (Ground) V+ Reference Current 5 5 0 VOUT |
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