SY88923AV

The SY88923AV incorporates a programmable level detect function to identify when the input signal has been lost. The LOS output will change from logic "LOW" to logic "HIGH" when input signal is smaller than the swing set by LOSLVL. This information can be fed back to the EN input of the SY88923AV to maintain stability under loss-of-signal condition. Using LOSLVL pin, the sensitivity of the level detection can be adjusted. The LOSLVL voltage can be set by connecting a resistor divider between VCC and VREF shown in Figure 3. "Typical Operating Characteristics" on page 6 show the relationship between input level sensitivity and the voltage set on LOSLVL. The LOS output is a TTL open collector output that requires a pull-up resistor for proper operation, Figure 1. (see PDF file)