SY88923V

Micrel, Inc. 5V/3.3V 2.5Gbps HIGH-SPEED LIMITING POST AMPLIFIER SY88923V SY88923V FEATURES s 3.3V and 5V power supply options s Up to 2.5Gbps operation s Low noise s Chatter-Free LOS Generation s Open Collector TTL LOS Output s TTL /EN Input s Differential PECL inputs for data s Single power supply s Designed for use with Micrel's Laser Diode Driver and Controller s Available in a tiny 10-pin (3mm) MSOP APPLICATIONS s 1.25Gbps and 2.5Gbps Gigabit Ethernet s 531Mbps, 1062Mbps and 2.12Gbps Fibre Channel s 622Mbps SONET s Gigabit Interface Converter s 2.5Gbps SDH/SONET s 2.5Gbps Proprietary Links DESCRIPTION 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 2.5Gbps. Signals as small as 5mVPP 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. 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 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 show in Figure 3. Performance Curves show th...