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OPA2354 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA2354 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 33 page OPA354 OPA2354 OPA4354 SBOS233E − MARCH 2002− REVISED MAY 2009 www.ti.com 11 APPLICATIONS INFORMATION The OPA354 is a CMOS, rail-to-rail I/O, high-speed, voltage-feedback operational amplifier designed for video, high-speed, and other applications. It is available as a single, dual, or quad op amp. The amplifier features a 100MHz gain bandwidth, and 150V/ µs slew rate, but it is unity-gain stable and can be operated as a +1V/V voltage follower. OPERATING VOLTAGE The OPA354 is specified over a power-supply range of +2.7V to +5.5V ( ±1.35V to ±2.75V). However, the supply voltage may range from +2.5V to +5.5V ( ±1.25V to ±2.75V). Supply voltages higher than 7.5V (absolute maximum) can permanently damage the amplifier. Parameters that vary over supply voltage or temperature are shown in the typical characteristics section of this data sheet. RAIL-TO-RAIL INPUT The specified input common-mode voltage range of the OPA354 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, as shown in Figure 1. The N-channel pair is active for input voltages close to the positive rail, typically (V+) − 1.2V to 100mV above the positive supply, while the P-channel pair is on for inputs from 100mV below the negative supply to approximately (V+) − 1.2V. There is a small transition region, typically (V+) − 1.5V to (V+) − 0.9V, in which both pairs are on. This 600mV transition region can vary ±500mV with process variation. Thus, the transition region (both input stages on) can range from (V+) − 2.0V to (V+) − 1.5V on the low end, up to (V+) − 0.9V to (V+) − 0.4V on the high end. A double-folded cascode adds the signal from the two input pairs and presents a differential signal to the class AB output stage. RAIL-TO-RAIL OUTPUT A class AB output stage with common-source transistors is used to achieve rail-to-rail output. For high-impedance loads (> 200 Ω), the output voltage swing is typically 100mV from the supply rails. With 10 Ω loads, a useful output swing can be achieved while maintaining high open-loop gain. See the typical characteristic curve Output Voltage Swing vs Output Current. V BIAS1 V BIAS2 V IN+ V IN− Class AB Control Circuitry V O V − (Ground) V+ Reference Current Figure 1. Simplified Schematic |
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