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ADS1018-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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ADS1018-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 36 page VDD GND AIN0 VDD GND AIN1 VDD GND AIN2 VDD GND AIN3 AIN P AIN N GND Device ADS1018-Q1 SBAS741A – OCTOBER 2015 – REVISED NOVEMBER 2015 www.ti.com 8.3 Feature Description 8.3.1 Multiplexer The ADS1018-Q1 contains an input multiplexer (mux), as shown in Figure 8. Either four single-ended or two differential signals can be measured. Additionally, AIN0, AIN1, and AIN2 can be measured differentially to AIN3. The multiplexer is configured by bits MUX[2:0] in the Config register. When single-ended signals are measured, the negative input of the ADC is internally connected to GND by a switch within the multiplexer. Figure 8. Input Multiplexer When measuring single-ended inputs, the device does not output negative codes. These negative codes indicate negative differential signals; that is, (V(AINP) – V(AINN)) < 0. Electrostatic discharge (ESD) diodes to VDD and GND protect the ADS1018-Q1 inputs. To prevent the ESD diodes from turning on, keep the absolute voltage on any input within the range given in Equation 1: GND – 0.3 V < V(AINx) < VDD + 0.3 V (1) If the voltages on the input pins can possibly violate these conditions, use external Schottky diodes and series resistors to limit the input current to safe values (see the Absolute Maximum Ratings table). Also, overdriving one unused input on the ADS1018-Q1 may affect conversions currently taking place on other input pins. If overdriving unused inputs is possible, clamp the signal with external Schottky diodes. 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: ADS1018-Q1 |
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