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OPA336UJ Datasheet(PDF) 7 Page - Texas Instruments |
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OPA336UJ Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 24 page  OPA336, 2336, 4336 7 SBOS068C www.ti.com CAPACITIVE LOAD AND STABILITY OPA336 series op amps can drive a wide range of capaci- tive loads. However, all op amps under certain conditions may become unstable. Op-amp configuration, gain, and load value are just a few of the factors to consider when determining stability. When properly configured, OPA336 series op amps can drive approximately 10,000pF. An op amp in unity-gain configuration is the most vulnerable to capacitive load. The capacitive load reacts with the op amp’s output resistance, along with any additional load resistance, to create a pole in the response which degrades the phase margin. In unity gain, OPA336 series op amps perform well with a pure capacitive load up to about 300pF. Increasing gain enhances the amplifier’s ability to drive loads beyond this level. One method of improving capacitive load drive in the unity-gain configuration is to insert a 50 Ω to 100Ω resistor inside the feedback loop, as shown in Figure 3. This reduces ringing with large capacitive loads while maintaining DC R S 100 Ω OPAx336 C L R L V IN V OUT APPLICATIONS INFORMATION OPA336 series op amps are fabricated on a state-of-the-art 0.6 micron CMOS process. They are unity-gain stable and suitable for a wide range of general-purpose applications. Power-supply pins should be bypassed with 0.01 µF ceramic capacitors. OPA336 series op amps are protected against reverse battery voltages. OPERATING VOLTAGE OPA336 series op amps can operate from a +2.1V to +5.5V single supply with excellent performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in the typical characteristics. OPA336 series op amps are fully specified for operation from +2.3V to +5.5V; a single limit applies over the supply range. In addition, many parameters are ensured over the specified temperature range, –40 °C to +85°C. INPUT VOLTAGE The input common-mode range of OPA336 series op amps extends from (V–) – 0.2V to (V+) – 1V. For normal operation, inputs should be limited to this range. The absolute maximum input voltage is 300mV beyond the supplies. Thus, inputs greater than the input common-mode range but less than maximum input volt- age, while not valid, will not cause any damage to the op amp. Furthermore, the inputs may go beyond the power supplies without phase inversion, as shown in Figure 1, unlike some other op amps. Normally, input bias current is approximately 1pA. How- ever, input voltages exceeding the power supplies can cause excessive current to flow in or out of the input pins. Momentary voltages greater than the power supply can be tolerated as long as the current on the input pins is limited to 10mA. This is easily accomplished with an input resis- tor, as shown in Figure 2. 5k Ω OPAx336 10mA max +5V V IN V OUT I OVERLOAD FIGURE 1. No Phase Inversion with Inputs Greater than the Power-Supply Voltage. FIGURE 2. Input Current Protection for Voltages Exceeding the Supply Voltage. FIGURE 3. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive. 6V 0V V OUT |
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