Hi,
I recently purchased the ADS1298ECGFE-PDK (Analog front end + MMB0).
I'm currently exploring the use of the ASD1298ECGFE with another microcontroller. Thus, I'm trying to understand how the ADS1298ECGFE is meant to be powered up. I'm reading the datasheet but i don't understand what is required.
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.
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 powersupply
scheme and Table 8 shows the board configurations for the digital supply.
In the first paragraph, it says that I need to supply 5V, 3V and 1.8V at the correct pin to J4 connector and the on-board power management will provide the necessary powers.
However, in the last paragraph, it says that I need to provide bipolar and digital supply.
- Bipolar analog supply of +/- 2.5V
- Digital supply of either 3V or 1V
Could you please advise.
Thanks
Regards,
Aslam