Hi Nagarjuna,
You don't need DATA ADMIN privilege to connect excel to HANA.
First you need to create a ODBC connection between Excel and HANA.
Then the user that needs to connect to HANA, needs SELECT access to SAP HANA Views present in _SYS_BIC schema and also the relevant Analytic Privilege.
If you want to try, you can grant SELECT access on _SYS_BIC schema and Analytic Privilege _SYS_BI_CP_ALL to your user and see if you are able to connect to HANA via Excel.
But these privileges shouldn't be given to end users.
You can check below blog on creating end users:
HANA Security: Creating End Users with minimal rights
Regards,
Vivek