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OPA725 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA725 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 28 page  OPA725, OPA2725 OPA726, OPA2726 SBOS278B − SEPTEMBER 2003 − REVISED JANUARY 2004 www.ti.com 11 APPLICATIONS INFORMATION OPA725 and OPA726 series 20MHz CMOS op amps have a fast slew rate, low noise, and excellent PSRR, CMRR, and AOL. These op amps can operate on typically 4.3mA 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. They are stable in a unity-gain configuration. Power-supply pins should be bypassed with 1nF ceramic capacitors in parallel with 1 µF tantalum capacitors. OPERATING VOLTAGE OPA725 series op amps are specified from 4V to 12V supplies over a temperature range of −40 °C to +125°C. They will operate well in ±5V or +5V to +12V power-supply systems. Parameters that vary significantly with operating voltage or temperature are shown in the Typical Characteristics. ENABLE/SHUTDOWN OPA725 series op amps require approximately 4.3mA quiescent current. The enable/shutdown feature of the OPA726 allows the op amp to be shut off to reduce this current to approximately 6 µA. The enable/shutdown input is referenced to the Enable Reference Pin, DGND (see Pin Configurations). This pin can be connected to logic ground in dual-supply op amp configurations to avoid level-shifting the enable logic signal, as shown in Figure 1. The Enable Reference Pin voltage, VDGND, must not exceed (V+) − 2V. It may be set as low as V−. The amplifier is enabled when the Enable Pin voltage is greater than VDGND + 2V. The amplifier is disabled (shutdown) if the Enable Pin voltage is less than VDGND + 0.8V. The Enable Pin is connected to internal pull-up circuitry and will enable the device if left unconnected. COMMON-MODE VOLTAGE RANGE The input common-mode voltage range of the OPA725 and OPA726 series extends from V− to (V+) − 2V. Common-mode rejection is excellent throughout the input voltage range from V− to (V+) − 3V. CMRR decreases somewhat as the common-mode voltage extends to (V+) − 2V, but remains very good and is tested throughout this range. See the Electrical Characteristics table for details. DGND Digital Logic Enable OPA726 +12V a) Single−Supply Configuration b) Dual−Supply Configuration DGND Digital Logic Enable OPA726 +5V −5V V OUT V OUT Figure 1. Enable Reference Pin Connection for Single- and Dual-Supply Configurations INPUT OVER-VOLTAGE PROTECTION Device inputs are protected by ESD diodes that will conduct if the input voltages exceed the power supplies by more than approximately 300mV. Momentary voltages greater than 300mV beyond the power supply can be tolerated if the current is limited to 10mA. This is easily accomplished with an input resistor in series with the op amp, as shown in Figure 2. The OPA725 series features no phase inversion when the inputs extend beyond supplies, if the input is current limited. R OPA725 V+ V − V IN V OUT 10mA max I OVERLOAD Figure 2. Input Current Protection for Voltages Exceeding the Supply Voltage |
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