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MUX36D08IPWR 数据表(PDF) 29 Page - Texas Instruments |
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MUX36D08IPWR 数据表(HTML) 29 Page - Texas Instruments |
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29 / 52 page  ADS8864 REF VINP VINM + + + Charge Kickback Filter Gain Network Gain Network Gain Network High-Voltage Level Translation VCM High-Voltage Multiplexed Input Reference Driver REF3140 RC Filter OPA350 RC Filter Analog Inputs LED Photo Detector Bridge Sensor Thermocouple Current Sensing Optical Sensor OPA192 OPA192 OPA140 29 MUX36S16, MUX36D08 www.ti.com SLASED9C – NOVEMBER 2016 – REVISED OCTOBER 2019 Product Folder Links: MUX36S16 MUX36D08 Submit Documentation Feedback Copyright © 2016–2019, Texas Instruments Incorporated 9 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. 9.1 Application Information The MUX36xxx family offers outstanding input/output leakage currents and ultra-low charge injection. These devices operate up to 36 V, and offer true rail-to-rail input and output. The on-capacitance of the MUX36xxx is very low. These features makes the MUX36xxx a family of precision, robust, high-performance analog multiplexer for high-voltage, industrial applications. 9.2 Typical Application Figure 43 shows a 16-bit, differential, 8-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 mux. This TI Precision Design details the process for optimizing the precision, high-voltage, front-end drive circuit using the MUX36D08, OPA192 and OPA140 to achieve excellent dynamic performance and linearity with the ADS8864. Figure 43. 16-Bit Precision Multiplexed Data-Acquisition System for High-Voltage Inputs With Lowest Distortion 9.2.1 Design Requirements The primary objective is to design a ±20 V, differential, 8-channel, multiplexed, data-acquisition system with lowest distortion using the 16-bit ADS8864 at a throughput of 400 kSPS for a 10-kHz, full-scale, pure, sine-wave input. The design requirements for this block design are: • System supply voltage: ±15 V • ADC supply voltage: 3.3 V • ADC sampling rate: 400 kSPS • ADC reference voltage (REFP): 4.096 V • System input signal: A high-voltage differential input signal with a peak amplitude of 20 V and frequency (fIN) of 10 kHz are applied to each differential input of the mux. |
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