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OPA2364IDGKR Datasheet(PDF) 10 Page - Texas Instruments |
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OPA2364IDGKR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 27 page OPA363, 2363, 364, 2364, 4364 SBOS259B 10 www.ti.com FIGURE 7. The OPA363 and OPA364 Directly Drive the ADS8324. FIGURE 9. OPA2363 Configured as Half of a Dual Stereo Headphone Driver. FIGURE 8. Driving the 12-Bit A/D Converter on the MSP430. BUFFERED REFERENCE VOLTAGE Many single-supply applications require a mid-supply refer- ence voltage. The OPA363 and OPA364 offer excellent capacitive load drive capability, and can be configured to provide a 0.9V reference voltage, as can be seen in Figure 6. For appropriate loading considerations, see the “Capacitive Load” section. AUDIO APPLICATIONS The OPA363 and OPA364 op amp family has linear offset voltage over the entire input common-mode range. Com- bined with low-noise, this feature makes the OPA363 and OPA364 suitable for audio applications. Single supply 1.8V operation allows the OPA2363 and OPA2364 to be optimal candidates for dual stereo-headphone drivers and micro- phone pre-amplifiers in portable stereo equipment, see Fig- ures 9 and 10. FIGURE 6. The OPA363 and OPA364 Provide a Stable Reference Voltage. V+ R 1 10k Ω R 2 10k Ω 0.9V OPAx363 OPAx364 V+ C L = 1µF ADS8324 V+ = 1.8V V+ = 1.8V OPA363 OPA364 V IN 100 Ω 1nF MSP430 V+ V+ V IN 100 Ω 1nF OPA363 OPA364 V+ V– 20k Ω 1/2 OPA2363 One of Right or Left Channel One of Right or Left Headphone Out 10k Ω 20k Ω V+ V– Internally Biased 20k Ω 1/2 TPS6100 20k Ω 10k Ω 1 µF 47pF V– DIRECTLY DRIVING THE ADS8324 AND THE MSP430 The OPA363 and OPA364 series op amps are optimized for driving medium speed (up to 100kHz) sampling A/D convert- ers. However, they also offer excellent performance for higher speed converters. The no crossover input stage of the OPA363 and OPA364 directly drive A/D converters without degradation of differential linearity and THD. They provide an effective means of buffering the A/D converters input capaci- tance and resulting charge injection while providing signal gain. Figure 7 and Figure 8 show the OPA363 and OPA364 configured to drive the ADS8324 and the 12-bit A/D converter on the MSP430. |
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