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OPA4348AIDRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA4348AIDRG4 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 32 page  R I OPA348 V IN V OUT R F C FB C IN C L OPA348 OPA2348 OPA4348 SBOS213G – NOVEMBER 2001 – REVISED MARCH 2013 www.ti.com In unity-gain inverter configuration, phase margin can DRIVING A/D CONVERTERS be reduced by the reaction between the capacitance The OPA348 series op amps are optimized for driving at the op amp input, and the gain setting resistors, medium-speed sampling Analog-to-Digital Converters thus degrading capacitive load drive. Best (ADCs). The OPA348 op amps buffer the ADCs input performance is achieved by using small valued capacitance and resulting charge injection while resistors. For example, when driving a 500pF load, providing signal gain. reducing the resistor values from 100k Ω to 5kΩ decreases overshoot from 55% to 13% (see the The OPA348 in a basic noninverting configuration typical characteristic Small-Signal Overshoot vs Load driving the ADS7822, see Figure 25. The ADS7822 is Capacitance, Figure 13). However, when large valued a 12-bit, microPOWER sampling converter in the resistors cannot be avoided, a small (4pF to 6pF) MSOP-8 package. When used with the low-power, capacitor, CFB, can be inserted in the feedback, as miniature packages of the OPA348, the combination shown in Figure 24. This significantly reduces is ideal for space-limited, low-power applications. In overshoot by compensating the effect of capacitance, this configuration, an RC network at the ADC’s input CIN, which includes the amplifier's input capacitance can be used to provide for anti-aliasing filter and and PC board parasitic capacitance. charge injection current. The OPA348 in noninverting configuration driving ADS7822 limited, low-power applications. In this configuration, an RC network at the ADC’s input can be used to provide for antialiasing filter and charge injection current. See Figure 26 for the OPA2348 driving an ADS7822 in a speech bandpass filtered data acquisition system. This small, low-cost solution provides the necessary amplification and signal conditioning to interface directly with an electret microphone. This circuit will operate with VS = 2.7V to 5V with less than 250 μA typical quiescent current. Figure 24. Improving Capacitive Load Drive 10 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: OPA348 OPA2348 OPA4348 |
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