A photodiode structure (300) includes a first plurality of co-located light band detectors that generate analog detector signals, a first multiplexing circuit (440) coupled to the first plurality of analog detector signals, which sequentially generates each of the first plurality of analog detector signals at a first multiplexed output (444), a second multiplexing circuit (445) coupled to a first plurality of reference signals, which sequentially generates at a second multiplexed output (449) each of the first plurality of reference signals in synchronism with the first multiplexed output (444); and a single digital pixel sensor circuit (315) having inputs coupled to the first and second multiplexed outputs, which sequentially generates a series of digital outputs based on the first and second multiplexed outputs (444. 449).