Well - it's a bit of a mix. I believe that all teams get the same base amount, which is the largest part of things. Then they get smaller amounts on top of that based on how many times they are on TV for the main evening games, so the better/more popular teams get a little more there.
Having said that, the German model is one of the most equitable systems, which is one of the main reasons why there is more parity, and the lower clubs can compete and win in most games - unlike Spain, for example, where Real and Barcelona are 30 points ahead of their nearest competition most years, and the real battle is for third place.
The flip side is that making it to European competitions is even bigger, since that is the main way to supplement the standard money a club can expect.