Adicionar Charset na Conexão String SQL Server PHP

Adicionar Charset na Conexão String

$serverName = "bancodb\meubd, 1222"; //serverName\instanceName
$connectionInfo = array( "Database"=>"BancoSistem", "UID"=>"User1", "CharacterSet" => "UTF-8", "PWD"=>"minhaSenha");
$conn = sqlsrv_connect( $serverName, $connectionInfo);

if($conn){

}