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OPA2705EA/250 Datasheet(PDF) 8 Page - Texas Instruments |
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OPA2705EA/250 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 15 page OPA705, 2705, 4705 8 SBOS182A APPLICATIONS INFORMATION OPA705 series op amps can operate on 160 µA quiescent current from a single (or split) supply in the range of 4V to 12V ( ±2V to ±6V), making them highly versatile and easy to use. The OPA705 is unity-gain stable and offers 1MHz bandwidth and 0.6V/ µs slew rate. Rail-to-rail input and output swing helps maintain dynamic range, especially in low supply applications. Figure 1 shows the input and output waveforms for the OPA705 in unity- gain configuration. Operation is from a ±5V supply with a 100k Ω load connected to V S/ 2. The input is a 10Vp-p sinusoid. Output voltage is approximately 10Vp-p. Power-supply pins should be bypassed with 1000pF ceramic capacitors in parallel with 1 µF tantalum capacitors. OPERATING VOLTAGE OPA705 series op amps are fully specified and guaranteed from +4V to +12V over a temperature range of –40ºC to +85ºC. Parameters that vary significantly with operating volt- ages or temperature are shown in the Typical Characteristics. RAIL-TO-RAIL INPUT The input common-mode voltage range of the OPA705 series extends 300mV beyond the supply rails at room temperature. 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 2. The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 2.0V to 300mV above the positive supply, while the P- channel pair is on for inputs from 300mV below the negative supply to approximately (V+) – 1.5V. There is a small transition region, typically (V+) – 2.0V to (V+) – 1.5V, in which both pairs are on. This 500mV transition region can vary ±100mV with process variation. Thus, the transition region (both stages on) can range from (V+) – 2.1V to (V+) – 1.4V on the low end, up to (V+) – 1.9V to (V+) – 1.6V on the high end. Within the 500mV transition region PSRR, CMRR, offset voltage, and offset drift, and THD may vary compared to operation outside this region. FIGURE 2. Simplified Schematic. FIGURE 1. Rail-to-Rail Input and Output. Input Output (inverted on scope) G = +1, V S = ±5V 200 µs/div V O V– V+ V IN+ V IN– |
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