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OPA348AIDCKR Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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OPA348AIDCKR Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 19 page OPA348, 2348, 4348 7 SBOS213C www.ti.com FIGURE 3. OPA348—No Phase Inversion with Inputs Greater than the Power-Supply Voltage. APPLICATIONS INFORMATION OPA348 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. The OPA348 series features wide bandwidth and unity-gain stability with rail-to-rail input and output for increased dynamic range. Figure 1 shows the input and output waveforms for the OPA348 in unity-gain configuration. Operation is from a single +5V supply with a 100k Ω load connected to V S/ 2. The input is a 5Vp-p sinusoid. Output voltage is approximately 4.98Vp-p. Power-supply pins should be bypassed with 0.01 µF ceramic capacitors. on the high end. Within the 200mV transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation outside this region. FIGURE 1. The OPA348 Features Rail-to-Rail Input/Output. 5V 0V G = +1V/V, V S = +5V 20 µs/div Output (Inverted on Scope) OPERATING VOLTAGE OPA348 series op amps are fully specified and tested from +2.5V to +5.5V. However, supply voltage may range from +2.1V to +5.5V. Parameters are tested over the specified supply range—a unique feature of the OPA348 series. In addition, all temperature specifications apply from –40 °C to +125 °C. Most behavior remains virtually unchanged through- out the full operating voltage range. Parameters that vary significantly with operating voltages or temperature are shown in the Typical Characteristics. COMMON-MODE VOLTAGE RANGE The input common-mode voltage range of the OPA348 series extends 200mV beyond the supply rails. This is achieved with a complementary input stage—an N-channel input differ- ential 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+) – 1.2V to 300mV above the positive supply, while the P-channel pair is on for inputs from 300mV below the negative supply to approximately (V+) – 1.4V. There is a small transition region, typically (V+) – 1.4V to (V+) – 1.2V, in which both pairs are on. This 200mV transition region, shown in Figure 2, can vary ±300mV with process variation. Thus, the transition region (both stages on) can range from (V+) – 1.7V to (V+) – 1.5V on the low end, up to (V+) – 1.1V to (V+) – 0.9V 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 power supplies without phase inversion, as shown in Figure 3. 5V 0V G = +1V/V, V S = +5V 10 µs/div V IN V OUT –0.5 Common-Mode Voltage (V) OFFSET VOLTAGE vs FULL COMMON-MODE VOLTAGE RANGE 0 V– 0.5 1.5 12.5 23.5 3 4.5 5 45.5 2 1.5 1 0.5 0 –0.5 –1 –1.5 –2 V+ FIGURE 2. Behavior of Typical Transition Region at Room Temperature. |
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