Datasheet 1.2r0: LOOPBBEN register is not specified entirely in the documentation

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Originally logged by @chemeris : LOOPBBEN register is not specified entirely in the documentation. Check the "LMS6002D IF-RF LoopBack Options.pdf" for a diagram of its connections and the values below for details about controlling it. To use BB loopback you must power down the stage preceding to the one you're connecting loopback to. LOOPBBEN[1:0]: Baseband loopback switches control 00 – All switches are open (default) 01 – provides TXLPF output to baseband loopback 10 – provides TXVGA1 output to baseband loopback 11 – provides envelop/peak detector output to baseband loopback