ML4621

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.

VCC GND ................................................ 0.3V to 7.0V
VCC TTL GND TTL ................................... 0.3V to 7.0V
GND ............................................... 0.3V to VCC + 0.3V
Junction Temperature .............................................. 150°C
Storage Temperature Range ..................... 65°C to 150°C
Lead Temperature (Soldering, 10 sec) ..................... 260°C
Thermal Resistance (qJA)
24 Pin Narrow PDIP ......................................... 54°C/W
28 Pin PLCC ..................................................... 68°C/W

The ML4621 data quantizer is a low noise, wideband monolithic IC designed specifically for signal recovery applications in fiber-optic receiver systems. ML4621 contains a two stage wideband limiting amplifier which is capable of accepting an input signal as low as 2mV with a 55dB dynamic range. This high level of sensitivity is achieved by using a DC restoration feedback loop which nulls any offset voltage produced in the limiting amplifier. The output stage of ML4621 is a high speed comparator circuit with both TTL and ECL outputs. An enable pin is included for added control.

The minimum signal discriminator circuit of ML4621 provides a link monitor function with a user selectable reference voltage. This circuit monitors the peaks of the input signal and provides a logic level output indicating when the input falls below an acceptable level. This output of ML4621 can be used to disable the quantizer and/or drive an LED, providing a visible link status.