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OPA2353EA250G4 Datasheet(PDF) 8 Page - Texas Instruments |
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OPA2353EA250G4 Datasheet(HTML) 8 Page - Texas Instruments |
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8 / 26 page  8 OPA353, 2353, 4353 ® APPLICATIONS INFORMATION OPA353 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. They are well suited for controlling the output power in cell phones. These applications often require high speed and low noise. In addition, the OPA353 series offers a low cost solution for general purpose and consumer video applications (75 Ω drive capability). Excellent ac performance makes the OPA353 series well suited for audio applications. Their bandwidth, slew rate, low noise (5nV/ √Hz), low THD (0.0006%), and small pack- age options are ideal for these 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 voltage supply applica- tions. Figure 1 shows the input and output waveforms for the OPA353 in unity-gain configuration. Operation is from a single +5V supply with a 1k Ω load connected to VS /2. The input is a 5Vp-p sinusoid. Output voltage is approximately 4.95Vp-p. Power supply pins should be bypassed with 0.01 µF ceramic capacitors. OPERATING VOLTAGE OPA353 series op amps are fully specified from +2.7V to +5.5V. However, supply voltage may range from +2.5V to +5.5V. Parameters are guaranteed over the specified supply range—a unique feature of the OPA353 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 guaranteed input common-mode voltage range of the OPA353 series extends 100mV beyond the supply rails. This is achieved with a complementary input stage—an N-channel input differential pair in parallel with a P-channel differential pair (see Figure 2). The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 1.8V to 100mV above the positive supply, while the P-channel pair is on for inputs from 100mV below the negative supply to approximately (V+) – 1.8V. There is a small transition region, typically (V+) – 2V to (V+) – 1.6V, in which both pairs are on. This 400mV transition region can vary ±400mV with process variation. Thus, the transition region (both input stages on) can range from (V+) – 2.4V to (V+) – 2.0V on the low end, up to (V+) – 1.6V to (V+) – 1.2V on the high end. FIGURE 2. Simplified Schematic. V BIAS1 V BIAS2 V IN+ V IN– Class AB Control Circuitry V O V– (Ground) V+ Reference Current 0 5V VS = +5, G = +1, RL = 1kΩ VIN FIGURE 1. Rail-to-Rail Input and Output. 5V 0 VOUT |
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