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OPA4374AIDRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA4374AIDRG4 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 37 page  OPA373, OPA2373 OPA374 OPA2374, OPA4374 SBOS279E − SEPTEMBER 2003 − REVISED MAY 2008 www.ti.com 11 DRIVING ADCs The OPA373 and OPA374 series op amps are optimized for driving medium-speed sampling ADCs. The OPA373 and OPA374 op amps buffer the ADC input capacitance and resulting charge injection, while providing signal gain. The OPA373 is shown driving the ADS7816 in a basic noninverting configuration, as shown in Figure 7. The ADS7816 is a 12-bit, MicroPower sampling converter in the MSOP-8 package. When used with the low-power, miniature packages of the OPA373, the combination is ideal for space-limited, low-power applications. In this configuration, an RC network at the ADC input can be used to provide anti-aliasing filtering. Figure 8 shows the OPA373 driving the ADS7816 in a speech band-pass 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. The OPA373 is shown in the inverting configuration described in Figure 9. In this configuration, filtering may be accomplished with the capacitor across the feedback resistor. ENABLE/SHUTDOWN OPA373 and OPA374 series op amps typically require 585 µA quiescent current. The enable/shutdown feature of the OPA373 allows the op amp to be shut off in order to reduce this current to less than 1 µA. ADS7816 12−Bit ADC DCLOCK D OUT CS/SHDN OPA373 +5V V IN V+ 2 +In 3 −In V REF 8 4 GND Serial Interface 1 0.1 µF 0.1 µF 7 6 5 NOTE: ADC Input = 0 to V REF V IN =0V to 5V for 0V to 5V output. RC network filters high frequency noise. 500 Ω 3300pF f SAMPLE =100kHz Figure 7. The OPA373 in Noninverting Configuration Driving the ADS7816 C 3 33pF V+ 3 1 8 4GND 5 6 7 −IN +IN 2 DCLOCK Serial Interface C 2 1000pF R 1 1.5k Ω R 4 20k Ω R 5 20k Ω R 6 100k Ω R 8 150k Ω R 9 510k Ω R 7 51k Ω D OUT V REF V+ = +2.7V to +5V CS/SHDN C1 1000pF Electret Microphone(1) G = 100 Passband 300Hz to 3kHz R 3 1M Ω R 2 1M Ω NOTE: (1) Electret microphone powered by R 1. ADS7816 12−Bit ADC 1/2 OPA2373 1/2 OPA2373 Figure 8. The OPA2373 as a Speech Bypass Filtered Data Acquisition System |
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