SBAU171D May   2010  – January 2016 ADS1198 , ADS1298

 

  1.   ADS1298ECG-FE/ADS1198ECG-FE
    1.     Trademarks
    2. 1 ADS1298ECG-FE/ADS1198ECG-FE Overview
      1. 1.1 Important Disclaimer Information
      2. 1.2 Introduction
      3. 1.3 Supported Features
      4. 1.4 Features Not Supported in Current Version
      5. 1.5 ADS1x98ECG-FE Hardware
      6. 1.6 Minimum System Requirements for ADS1x98ECG-FE Evaluation Software
    3. 2 Quick Start
      1. 2.1 Default Jumper/Switch Configuration
      2. 2.2 ADS1x98ECG-FE Operation
    4. 3 Using the ADS1298ECG-FE Software
      1. 3.1 Application User Menu
      2. 3.2 Top-Level Application Controls
      3. 3.3 About Tab
      4. 3.4 ADC Register Tab
        1. 3.4.1 Standby and Reset Controls
        2. 3.4.2 Channel Registers Tab (ADC Register)
          1. 3.4.2.1 Global Channel Registers
          2. 3.4.2.2 Channel Control Registers
        3. 3.4.3 LOFF and RLD Tab (ADC Register)
          1. 3.4.3.1 Lead-Off Detection and Current Direction Control Registers
          2. 3.4.3.2 Right Leg Drive Derivation Control Registers
        4. 3.4.4 GPIO and OTHER Registers Tab (ADC Register)
          1. 3.4.4.1 Wilson Central and Augmented Lead Registers
        5. 3.4.5 Register Map (ADC Register)
      5. 3.5 Analysis Tab
        1. 3.5.1 Scope Tab (Anaysis)
          1. 3.5.1.1 Zoom Tool
        2. 3.5.2 Histogram Tab (Analysis)
        3. 3.5.3 FFT Tab
        4. 3.5.4 ECG Tab (Analysis)
      6. 3.6 Save Tab
    5. 4 ADS1x98ECG-FE Input Signals
      1. 4.1 Input Short Testing
      2. 4.2 Internal Test Signals Input
      3. 4.3 Temperature Sensor
      4. 4.4 Normal Electrode Input
        1. 4.4.1 Capturing 12-Lead ECG Signals
      5. 4.5 MVDD Input, RLD Measurement, RLD Positive Electrode Driver, and RLD Negative Electrode Driver
      6. 4.6 Lead Derivation
      7. 4.7 Wilson Center Terminal (WCT)
      8. 4.8 Right Leg Drive
        1. 4.8.1 RLD Common Mode Voltage
        2. 4.8.2 Driving the RLD Cable Shield
      9. 4.9 PACE Detection
    6. 5 ADS1298ECG-FE/ADS1198ECG-FE Hardware Details
      1. 5.1 Jumper Description
      2. 5.2 Power Supply
      3. 5.3 Clock
      4. 5.4 Reference
      5. 5.5 Analog Output Signals
      6. 5.6 Digital Signals
      7. 5.7 Analog Input Signals
        1. 5.7.1 Patient Simulator Input
        2. 5.7.2 Arbitrary Input Signals
  2. ASchematics, BOM, Layout, and ECG Cable Details
    1. A.1 Overview
    2. A.2 ADS1x98ECG-FE Front-End Board Schematics
    3. A.3 Bill of Materials
      1. Table 13. Bill of Materials: ADS1x98ECG-FE
    4. A.4 Printed Circuit Board Layout
    5. A.5 ECG Cable Details
  3. BExternal Optional Hardware
    1. B.1 Optional External Hardware (Not Included)
    2. B.2 ADS1x98ECG-FE Power-Supply Recommendations
  4. CSoftware Installation
    1. C.1 Minimum Requirements
    2. C.2 Installing the Software

5.2 Power Supply

The ADS1x98EVM mounts on the MMB0 EVM with connectors J2, J3 and J4. The main power supplies (+5V, +3V and +1.8V) for the front-end board are supplied by the host board, MMB0, through connector J4. All other power supplies needed for the front-end board are generated on board by power management devices. The EVM is shipped in +3V unipolar supply configuration.

The ADS1298 can operate in a single supply with +3.0V to +5.0V analog supply (AVDD/AVSS) or bipolar mode supply (±1.5V to ±2.5V). An additional digital supply of and +1.8V to +3.0V digital supply (DVDD) is required for operation. The ADS1298EVM power consumption can be measured by removing the JP4 jumper and JP24 jumper to connect an ammeter. By shorting JP5, the ADS1298 can be placed in powerdown mode for low power consumption.

Test points TP5, TP6, TP7, TP8, TP9, TP10, and TP14 are provided to verify the power supplies voltages are correct. The test points and voltages are shown in Table 6.

Table 6. Power-Supply Test Points

Test Point Voltage
TP7 +5.0V
TP9 +1.8V
TP10 +3.3V
TP5 +3.0V
TP13 +2.5V
TP6 –2.5V
TP8 GND

The front-end board must be properly configured in order to achieve the various power-supply schemes. The default power-supply setting for the ADS1298ECG-FE is a bipolar analog supply of ±2.5V and DVDD of either +3V or +1.8V. Table 7 shows the board and component configurations for each analog power-supply scheme and Table 8 shows the board configurations for the digital supply.

Table 7. Analog Supply Configurations (AVDD/AVSS)

Unipolar Analog Supply Bipolar Analog Supply
AVDD/AVSS 3V 5V ±1.5V ±2.5V
JP20 1-2 1-2 2-3 2-3
JP2 2-3 2-3 1-2 1-2
U7 TPS73230 TPS73250 Don't Care Don't Care
U9 Don't Care Don't Care TPS73201 TPS73201
U8 Don't Care Don't Care TPS72301 TPS72301
R52 Don't Care Don't Care 21kΩ 47.5kΩ
R53 Don't Care Don't Care 78.7kΩ 43kΩ
R56 Don't Care Don't Care 23.3kΩ 49.9kΩ
R57 Don't Care Don't Care 95.3kΩ 46.4kΩ
C87, C67, C62 Not Installed Not Installed Not Installed Not Installed

Table 8. Digital Supply Configurations (DVDD/DGND)

DVDD +3.0V +1.8V
JP24 1-2 2-3