call csvde in powershell

I am trying to call CSVDE in powershell passing some credentials to it. Its part of a bigger picture so I cant just run CSVDE seperately. 

Cant seem to get it right. 

Any ideas?

Thanks in advance.

___

$cred = Get-Credential

$domain = "testdomain"

$cmd = "csvde -f $outputFile -r "(objectclass=msExchDynamicDistributionList)" -s $domain"

$outputFile = "c:\scripts\DynamicGroups.csv"

#Get Groups:

Invoke-command -ScriptBlock {$cmd}