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OPA2374AIDCNTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA2374AIDCNTG4 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 37 page  OPA373, OPA2373 OPA374 OPA2374, OPA4374 SBOS279E − SEPTEMBER 2003 − REVISED MAY 2008 www.ti.com 9 APPLICATIONS The OPA373 and OPA374 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. Rail-to-rail input and output make them ideal for driving sampling Analog-to-Digital Converters (ADCs). Excellent ac performance makes them well-suited for audio applications. The class AB output stage is capable of driving 100k Ω loads connected to any point between V+ and ground. The input common-mode voltage range includes both rails, allowing the OPA373 and OPA374 series op amps to be used in virtually any single-supply application up to a supply voltage of +5.5V. Rail-to-rail input and output swing significantly increases dynamic range, especially in low-supply applications. Power-supply pins should be bypassed with 0.01 µF ceramic capacitors. OPERATING VOLTAGE The OPA373 and OPA374 op amps are specified and tested over a power-supply range of +2.7V to +5.5V ( ±1.35V to ±2.75V). However, the supply voltage may range from +2.3V to +5.5V ( ±1.15V to ±2.75V). Supply voltages higher than 7.0V (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. COMMON-MODE VOLTAGE RANGE The input common-mode voltage range of the OPA373 and OPA374 series extends 200mV 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. The N-channel pair is active for input voltages close to the positive rail, typically (V+) − 1.65V to 200mV above the positive supply, while the P-channel pair is on for inputs from 200mV below the negative supply to approximately (V+) − 1.65V. There is a 500mV transition region, typically (V+) − 1.9V to (V+) − 1.4V, in which both pairs are on. This 500mV transition region, shown in Figure 1, can vary ±300mV with process variation. Thus, the transition region (both stages on) can range from (V+) − 2.2V to (V+) − 1.7V on the low end, up to (V+) − 1.6V to (V+) − 1.1V on the high end. Within the 500mV transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation outside this region. Common−Mode Voltage (V) −0.5 0 0.5 V − 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 2.0 1.5 1.0 0.5 0 −0.5 −1.0 −1.5 −2.0 V+ Figure 1. Behavior of Typical Transition Region at Room Temperature RAIL-TO-RAIL INPUT The input common-mode range extends from (V−) − 0.2V to (V+) + 0.2V. For normal operation, inputs should be limited to this range. The absolute maximum input voltage is 500mV beyond the supplies. Inputs greater than the input common-mode range but less than the maximum input voltage, while not valid, will not cause any damage to the op amp. Unlike some other op amps, if input current is limited, the inputs may go beyond the supplies without phase inversion, as shown in Figure 2. 1 µs/div 5V 0V V IN V OUT G= +1V/V, V S =5V Figure 2. OPA373: No Phase Inversion with Inputs Greater Than the Power-Supply Voltage Normally, input bias current is approximately 500fA; however, input voltages exceeding the power supplies by more than 500mV can cause excessive current to flow in or out of the input pins. Momentary voltages greater than 500mV beyond the power supply can be tolerated if the current on the input pins is limited to 10mA. This is easily accomplished with an input resistor; see Figure 3. (Many input signals are inherently current-limited to less than 10mA, therefore, a limiting resistor is not required.) |
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