1340TL
TIA / LIA with RSSI

Applications

• SONET OC-192 and SDH STM-64 transponders
• Short, intermediate, long reach, and long haul optical receiver modules
• 10 Gbps Ethernet
• Broadband instrumentation

Features

• Supports data rates up to 12.5 Gbps
• Differential electrical gain: 12 kΩ 
• Input-referred noise density: 10 pA / rt Hz
• Input overload current: 4 mA min 
• Output voltage: 440 mVpp
• Receive signal strength indicator (RSSI)
• Adjustable DC offset control
• Squelch / output enable
• Fast rise and fall times: 17 ps
• Low power consumption: 165 mW
• Typical input sensitivity: -19 dBm (ρ = 0.85 A / W, ER = 9 dB)
• Single +3.3 V power supply
• Available in die form (980 μm x 980 μm)

Description

The 1340TL transimpedance amplifier / limiting amplifier (TIA / LIA) is designed to support data rates up to 12.5 Gbps. This device is intended for use with PIN photodetectors and is capable of amplifying input currents from 20μA and 5 mA with low duty cycle distortion. The 1340TL exhibits a typical input sensitivity of -19 dBm while maintaining a BER of 10^–12.

With 12 kΩ of differential gain, the 1340TL eliminates the need for a stand-alone LIA to amplify signals from a TIA.  The output level of the TIA / LIA ranges from 200 mV (minimum input) to 440 mV peak-to-peak.  This part has RSSI to help align fiber and monitor the input power level, an output enable to allow system debugging, and an adjustable DC offset to allow for adjustment of the decision threshhold of the limiting amplifier.  The DC offset level is automatically adjusted to 50% of eye crossing if no adjustments are made to the DCA pin.

The 1340TL has fast rise and fall times and low power consumption. The TIA / LIA operates off a single +3.3 V power supply and is available in die form.

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