Status: In Production
The SY88923V limiting post amplifier with its high gain and wide bandwidth is ideal for use as a post amplifier in fiber-optic receivers with data rates up to 2.5Gb/s. Signals as small as 5mVp-p can be amplified to drive devices with PECL inputs. The SY88923V generates a chatter-free Loss of Signal (LOS) open collector TTL output. The SY88923V incorporates a programmable level detect function to identify when the input signal has been lost. This information can be fed back to the EN input of the device 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. Figure 3 and Figure 4 show the relationship between input level sensitivity and the voltage set on LOSLVL. Figure 5 shows the relationship between input level sensitivity and resistor divider ratio.
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