Texas Instruments ADS131E08EVM-PDK, Руководство пользователя, Страница: 10 / 39

ADS131E08EVM Daughter-Card Hardware Overview
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10 SBAU200C – June 2012 – Revised April 2020
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Performance Demonstration Kit for the ADS131E08
3 ADS131E08EVM Daughter-Card Hardware Overview
CAUTION
Many of the components on the ADS131E08EVM are susceptible to damage
by electrostatic discharge (ESD). Customers are advised to observe proper
ESD handling procedures when unpacking and handling the EVM, including the
use of a grounded wrist strap, bootstraps, or mats at an approved ESD
workstation. An electrostatic smock and safety glasses should also be worn.
The ADS131E08EVM-PDK board is a four-layer circuit board. The board layout and schematics are
appended to the end of this document.
The ADS131E08EVM-PDK is configured to be used with the TI MMB0 data converter evaluation platform.
The key features of the ADS131E08 system on a chip (SOC) are:
• Eight integrated instrumentation amplifiers (INAs) and eight, 24-bit, high-resolution ADCs
• Low power consumption
• Data rates of 1 kSPS, 2 kSPS, 4 kSPS, 8 kSPS, 16 kSPS, 32 kSPS, and 64 kSPS (NOTE: 32 kSPS
and 64 kSPS data capture is
not supported by the current version of the firmware).
• 3-V to 5-V unipolar or bipolar analog supply, and 1.8-V to 3-V digital supply
• SPI data interface
The following sections explain some of the hardware settings possible with the EVM for evaluating the
ADS131E08 under various test conditions.
3.1 Power Supply
The ADS131E08EVM mounts on the MMB0 board with connectors J1, J2, and J3. The main power
supplies (+5 V, +3 V, and +1.8 V) for the front-end board are supplied by the host MMB0 board through
connector J3. All other power supplies required for the front-end board are generated onboard by power
management devices.
The ADS131E08 operates in unipolar mode using a +3.0-V to +5.0-V analog supply (AVDD/AVSS) and a
+1.8-V to +3.3-V digital supply (DVDD), or in bipolar mode using the onboard analog supply (±1.5 V to
±2.5 V). The power consumption of the front-end board is measured by using the JP3 jumper. Power
down the ADS131E08 by shorting jumper JP4.
Test points TP4, TP5, TP6, TP7, TP8, TP9, TP10, and TP13 are provided to verify that the host power
supplies are correct. The corresponding voltages are shown in
Table 2 .
Table 2. Power-Supply Test Points
Test Point Voltage
TP7 +5.0 V
TP4 –4.96 V
TP9 +1.8 V
TP10 +3.3 V
TP5 +3.0 V
TP13 +2.5 V
TP6 –2.5 V
TP8 GND