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OPA2357 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA2357 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 30 page  OPA357 OPA2357 SBOS235E − MARCH 2002− REVISED MAY 2009 www.ti.com 11 APPLICATIONS INFORMATION The OPA357 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 or dual 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 OPA357 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. ENABLE FUNCTION The OPA357’s Enable function is implemented using a Schmitt trigger. The amplifier is enabled by applying a TTL HIGH voltage level (referenced to V−) to the Enable pin. Conversely, a TTL LOW voltage level (referenced to V−) will disable the amplifier, reducing its supply current from 4.9mA to only 3.4 µA per amplifier. Independent Enable pins are available for each channel (dual version), providing maximum design flexibility. For portable battery-operated applications, this feature can be used to greatly reduce the average current and thereby extend battery life. The Enable input can be modeled as a CMOS input gate with a 100k Ω pull-up resistor to V+. This pin should be connected to a valid high or low voltage or driven, not left open circuit. The enable time is 100ns and the disable time is only 30ns. This allows the OPA357 to be operated as a gated amplifier, or to have its output multiplexed onto a common output bus. When disabled, the output assumes a high-impedance state. RAIL-TO-RAIL INPUT The specified input common-mode voltage range of the OPA357 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. 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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