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The maximum clock speed of a tracking ADC depends on the propagation delay of the DAC and the comparator. After every clock, the counter output has to propagate through the DAC and appear at the output. The compara- tor then takes some amount of time to respond to the change in DAC voltage, producing a new up/down control input to the counter. Tracking ADCs are not commonly available; in looking at the parts avail- able from Analog Devices, Maxim, and Burr-Brown (all three are manufac- turers of ADC components), not one tracking ADC is shown. This only makes sense: a successive approximation ADC with the same number of bits is faster. However, there is one case where a tracking ADC can be useful. If the input signal changes slowly with respect to the sampling clock, a tracking ADC may produce an output in fewer clocks than a successive approximation ADC. I saw a design once that implemented a tracking ADC in discrete hardware in exactly this situation. Flash ADC
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