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OPA4197IPWR Datasheet(PDF) 27 Page - Texas Instruments |
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OPA4197IPWR Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 56 page  SAR ADC REFP VINP VINM 1 4:2 Mux + + + Antialiasing Filter Gain Network Gain Network High-Voltage Level Translation VCM High-Voltage Multiplexed Input Reference Driver 2 4 Voltage Reference RC Filter Buffer RC Filter 16 Bits 400 kSPS Delay Digital Counter For Multiplexer CONV 5 3 Very Low Output Impedance Input-Filter Bandwidth High-Impedance Inputs No Differential Input Clamps Fast Settling-Time Requirements Attenuate High-Voltage Input Signal Fast-Settling Time Requirements Stability of the Input Driver Attenuate ADC Kickback Noise VREF Output: Value and Accuracy Low Temp and Long-Term Drift Fast logic transition ±20-V, 10-kHz Sine Wave ±20-V, 10-kHz Sine Wave + + + + Shmidtt Trigger Counter REF3240 Voltage Divider OPA350 VCM Generation Circuit n n CH0+ CH0- CH3+ CH3- OPA197 OPA197 OPA197 OPA197 OPA140 OPA197 OPA197 Gain Network 27 OPA197, OPA2197, OPA4197 www.ti.com SBOS737C – JANUARY 2016 – REVISED MARCH 2018 Product Folder Links: OPA197 OPA2197 OPA4197 Submit Documentation Feedback Copyright © 2016–2018, Texas Instruments Incorporated 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The OPAx197 family offers outstanding dc precision and ac performance. These devices operate up to 36-V supply rails and offer true rail-to-rail input/output, ultralow offset voltage and offset voltage drift, as well as 10-MHz bandwidth and high capacitive load drive. These features make the OPAx197 a robust, high- performance operational amplifier for high-voltage industrial applications. 8.2 Typical Applications 8.2.1 16-Bit Precision Multiplexed Data-Acquisition System Figure 53 shows a 16-bit, differential, 4-channel, multiplexed data-acquisition system. This example is typical in industrial applications that require low distortion and a high-voltage differential input. The circuit uses the ADS8864, a 16-bit, 400-kSPS successive-approximation-resistor (SAR) analog-to-digital converter (ADC), along with a precision, high-voltage, signal-conditioning front end, and a 4-channel differential multiplexer (mux). This application example explains the process for optimizing the precision, high-voltage, front-end drive circuit using the OPA197 and OPA140 to achieve excellent dynamic performance and linearity with the ADS8864. Figure 53. OPA197 in 16-Bit, 400-kSPS, 4-Channel, Multiplexed Data Acquisition System for High-Voltage Inputs With Lowest Distortion |
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