2251TA
22 Gbps Single Differential Input Linear TIA/VGA Amplifier

Applications

• 40G RZ-DQPSK receivers

Features

• Supports data rates up to 22.5 Gbps
• Linear TIA with integrated VGA
• Differential input and output
• 50 Ω to 5000 Ω differential electrical gain
• Adjustable bandwidth: 17 GHz – 24 GHz, typical
• Adjustable amplitude: 200 – 700 mVpp differential
• Automatic or manual gain control
• Peak detector output
• Low power consumption: 275 mW typical
• Available in die form

Description

The 2251TA is a single, differential linear transimpedance/variable-gain amplifier (TIA/VGA).The device is designed for 40 G DQPSK receivers.

The 2251TA offers two gain control modes: manual gain control and automatic gain control. In manual mode, the gain is controlled from 50 Ω to 5000 Ω differential. In automatic mode, the gain is automatically adjusted to deliver a constant output voltage.

The 2251TA provides linear amplification for current levels from 60 μApp to 4 mApp differential.

The 2251TA includes an adjustable bandwidth feature that allows the user to optimize receiver frequency response and output eye quality.  Small-signal bandwidth is adjustable from 17 GHz to 24 GHz, typical.  Output return loss is better than 10 dB to 11 GHz.

The 2251TA includes a peak detector output for closed loop control of a front-end optical demodulator.

The 2251TA operates from a single +3.3 V power supply, consumes 275 mW typical, and is available in die form.

 

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