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TLA202X Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza TLA202X
Descripción Electrónicos  Cost-Optimized, Ultra-Small, 12-Bit, System-Monitoring ADCs
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TLA202X Datasheet(HTML) 9 Page - Texas Instruments

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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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