i suggest you to use ADC 0848. it has eight multiplexed channels through which it recieves analog signal so you can connect both your lm 35 and ldr sensors by selecting an appropriate step size.
adc0804 has only one input so you can give it input from either lm35 or ldr. also you must note that the output of adc0804 is an 8 bit parallel. then how can you send 16 bits