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OPA340-EP Datasheet(PDF) 11 Page - Texas Instruments |
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OPA340-EP Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 19 page  10 to W 20W OPAx340 V+ V IN V OUT R S R L C L ADS7816 12-BitA/D DCLOCK D OUT CS/SHDN OPA340 +5V V IN V+ 2 +In 3 - In V REF 8 4 GND Serial Interface 1 0.1mF 0.1mF 7 6 5 NOTE:A/DInput=0toV REF V =0Vto5Vfor IN 0Vto5Voutput. RCnetworkfiltershighfrequencynoise. 500W 3300pF OPA340-EP www.ti.com SBOS433A – AUGUST 2008 – REVISED APRIL 2011 CAPACITIVE LOAD AND STABILITY DRIVING A/D CONVERTERS The OPA340 can drive a wide range of capacitive The OPA340 is optimized for driving medium speed loads. However, all operational amplifiers under (up to 100 kHz) sampling A/D converters. However, it certain conditions may become unstable. Op amp also offers excellent performance for higher speed configuration, gain, and load value are just a few of converters. The OPA340 provides an effective means the factors to consider when determining stability. An of buffering the A/D converter ’s input capacitance and operational amplifier in unity gain configuration is resulting charge injection while providing signal gain. most susceptible to the effects of capacitive load. The Figure 27 and Figure 28 show the OPA340 driving an capacitive load reacts with the operational amplifier ’s ADS7816. The ADS7816 is a 12-bit, micro-power output resistance, along with any additional load sampling converter in the tiny MSOP-8 package. resistance, to create a pole in the small-signal When used with the miniature package options of the response which degrades the phase margin. In unity OPA340 series, the combination is ideal for gain, OPA340 series operational amplifiers perform space-limited and low-power applications. For further well, with a pure capacitive load up to approximately information consult the ADS7816 data sheet. With the 1000 pF. Increasing gain enhances the amplifier ’s OPA340 in a noninverting configuration, an RC ability to drive more capacitance. See the typical network at the amplifier ’s output can be used to filter performance curve Small-Signal Overshoot vs high-frequency noise in the signal (see Figure 27). In Capacitive Load. the inverting configuration, filtering may be accomplished with a capacitor across the feedback One method of improving capacitive load drive in the resistor (see Figure 28). unity gain configuration is to insert a 10- Ω to 20-Ω resistor in series with the output, as shown in Figure 26. This significantly reduces ringing with large capacitive loads. However, if there is a resistive load in parallel with the capacitive load, it creates a voltage divider introducing a dc error at the output and slightly reduces output swing. This error may be insignificant. For example, with RL = 10 kΩ and RS = 20 Ω, there is only approximately 0.2% error at the output. Figure 26. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive Copyright © 2008–2011, Texas Instruments Incorporated 11 |
Similar Part No. - OPA340-EP_15 |
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Similar Description - OPA340-EP_15 |
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