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 k? (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