General description
The TZA3026 is a transimpedance amplifier with Automatic Gain Control (AGC), designed to be used in STM4/OC12 fiber optic links. It amplifies the current generated by a photo detector (PIN diode or avalanche photodiode) and converts it to a differential output voltage. It offers a current mirror of average photo current for RSSI monitoring to be used in SFF8472 compliant modules.
The low noise characteristics makes it suitable for STM4/OC12 applications, but also for FTTx applications.

Features
■ Low equivalent input noise current, typically 67 nA (RMS)
■ Wide dynamic range, typically 0.85 µA to 1.5 mA (p-p)
■ Differential transimpedance of 14 kΩ (typical)
■ Bandwidth from DC to 650 MHz (typical)
■ Differential outputs
■ On-chip AGC with possibility of external control
■ Single supply voltage 3.3 V, range 2.9 V to 3.6 V
■ Bias voltage for PIN diode
■ Current output of average photo current for RSSI monitoring
■ Identical ports available on both sides of die for easy bond layout and RF polarity selection

Applications
■ Digital fiber optic receiver modules in telecommunications transmission systems, in high speed data networks or in FTTx systems