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TLA202X Datasheet(PDF) 9 Page - Texas Instruments |
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TLA202X Datasheet(HTML) 9 Page - Texas Instruments |
9 / 33 page VDD GND AIN0 VDD GND AIN1 VDD GND AIN2 VDD GND AIN3 AINP AINN GND TLA2024 Copyright © 2017, Texas Instruments Incorporated 9 TLA2021, TLA2022, TLA2024 www.ti.com SBAS846 – NOVEMBER 2017 Product Folder Links: TLA2021 TLA2022 TLA2024 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 Multiplexer Figure 8 shows that the TLA2024 contains an analog input multiplexer (MUX). Four single-ended or two differential signals can be measured. Additionally, AIN0 and AIN1 can be measured differentially to AIN3. The multiplexer is configured by bits MUX[2:0] in the configuration 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 The TLA2021 and TLA2022 do not have an input multiplexer and can either measure one differential signal or one single-ended signal. For single-ended measurements, connect the AIN1 pin to GND externally. In subsequent sections of this data sheet, AINP refers to AIN0 and AINN refers to AIN1 for the TLA2021 and TLA2022. Electrostatic discharge (ESD) diodes connected to VDD and GND protect the TLA202x analog inputs. Keep the absolute voltage on any input within the range shown in Equation 1 to prevent the ESD diodes from turning on. GND – 0.3 V < V(AINX) < VDD + 0.3 V (1) If the voltages on the analog input pins can potentially violate these conditions, use external Schottky diodes and series resistors to limit the input current to safe values (see the Absolute Maximum Ratings table). |
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