SY88903V

Micrel, Inc. 5V/3.3V 1.25Gbps HIGH-SPEED LIMITING POST AMPLIFIER SY88903V SY88903V FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ 3.3V and 5V power supply option Up to 1.25Gbps operation Low noise Chatter-free LOS generation Open collector TTL LOS output TTL /EN Input Differential PECL inputs for data Single power supply Designed for use with laser diode driver and controller ■ Available in a tiny 10-pin (3mm × 3mm) MSOP DESCRIPTION The SY88903V 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 1.25Gbps. Signals as small as 5mVpp can be amplified to drive devices with PECL inputs. The SY88903V generates a chatter-free, Loss-of-Signal (LOS), open-collector TTL output. The SY88903V is an integrated limiting amplifier intended for high-frequency fiber optic applications. The circuit connects to typical transimpedance amplifiers found within a fiber optics link. The linear signal output from a transimpedance amplifier can contain significant amounts of noise, and may vary in amplitude over time. The SY88903V limiting amplifier quantizes the signal and outputs a voltage-limited waveform. The /EN pin allows the user to disable the output signal without removing the input signal. The SY88903V 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 conditio...