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OPA2342EA250G4 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA2342EA250G4 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 13 page OPA342, 2342, 4342 8 SBOS106A APPLICATIONS INFORMATION OPA342 series op amps are unity gain stable and can operate on a single supply, making them highly versatile and easy to use. 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 OPA342 in unity-gain configuration. Operation is from VS = +5V with a 10k Ω load connected to V S/ 2. The input is a 5Vp-p sinusoid. Output voltage is approximately 4.997Vp-p. Power supply pins should be by passed with 0.01 µF ceramic capacitors. OPERATING VOLTAGE OPA342 series op amps are fully specified and guaranteed from +2.7V to +5.5V. In addition, many specifications apply from –40ºC to +85ºC. Parameters that vary significantly with operating voltages or temperature are shown in the Typical Performance Curves. RAIL-TO-RAIL INPUT The input common-mode voltage range of the OPA342 series extends 300mV 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 300mV above the positive supply, while the P-channel pair is on for inputs from 300mV below the negative supply to approximately (V+) –1.3V. There is a small transition re- gion, 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 transition 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. Within the 400mV transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation outside this region. For more information on designing with rail-to-rail input op amps, see Figure 3 “Design Optimization with Rail-to-Rail Input Op Amps.” FIGURE 2. Simplified Schematic. V BIAS1 V BIAS2 V IN+ V IN– Class AB Control Circuitry V O V– (Ground) V+ Reference Current FIGURE 1. Rail-to-Rail Input and Output. 5 µs/div Output (inverted on scope) Input G = +1, VS = +5V 5V 0V |
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