The AD800 and AD802 were designed to operate with standard ECL signal levels at the data input. Although not recommended, smaller input signals are tolerable. Figure 8, 14, and 20 show the bit error rate performance versus input signal-tonoise ratio for input signal amplitudes of full 900 mV ECL, and decreased amplitudes of 80 mV and 20 mV. Wideband amplitude noise is summed with the data signals as shown in Figure 2. The full ECL and 80 mV signals give virtually indistinguishable results. The 20 mV signals also provide adequate performance when in lock, but signal acquisition may be impaired.