Datasheet

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ADS1298ECG-FE/ADS1198ECG-FE Hardware Details

Table 10. External Reference Jumper Options

Internal Reference External Reference

ADS1298 Reference VREF = 2.5V VREFP = 4.096V VREFP = 2.5V

JP25 Don't Care 2-3 1-2

JP3 Not Installed Installed Installed

The software uses the V

REF

value from the Reference Voltage control (CONFIG3 register) in

Section 3.4.2.1) to calculate the input-referred voltage value for all the tests. The default value is 2.5V. If

the user is using an alternative value, the control must be updated to display the collected data to the

proper scale.

5.5 Analog Output Signals

Several output signals from the ADS1298 are provided on the J5 header. Table 11 lists the various test

signals and their location on the header. The PACEOUT pins can also be used as an auxiliary differential

input channel. Alternatively with appropriate user configuration, these pins may provide PACE detection

for use with external PACE detection circuitry (see PACE Detect Register in Section 3.4.4).

Table 11. Test Signals

Signal J5 Pin Number Signal

PACEOUT2 1 2 PACEOUT1

NOT CONNECTED 3 4 NOT CONNECTED

PWDNB 5 6 GPIO4

DAISY_IN 7 8 GPIO3

GND 9 10 NOT CONNECTED

5.6 Digital Signals

The ADS1298 digital signals (including SPI interface signals, some GPIO signals, and some of the control

signals) are available at connector J3. These signals are used to interface to the MMB0 board DSP. The

pinout for this connector is given in Table 12.

Table 12. Serial Interface Pinout

Signal J3 Pin Number Signal

START/CS 1 2 CLKSEL

CLK 3 4 GND

NC 5 6 GPIO1

CS 7 8 RESETB

NC 9 10 GND

DIN 11 12 GPIO2

DOUT 13 14 NC/START

DRDYB 15 16 NC

NC 17 18 GND

NC 19 20 NC

5.7 Analog Input Signals

The ADS1298ECG-FE provides users the option to feed in standard ECG signals from a patient simulator

to the DB15 connector (J1), or to feed inputs from any arbitrary signal source directly to the ADS1298.

SBAU171C–May 2010–Revised September 2012 ADS1298ECG-FE/ADS1198ECG-FE

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