ADN2892ACPZ-RL7

3.3 V ， 4.25 Gbps的速率，限幅放大器 3.3 V, 4.25 Gbps, Limiting Amplifier

Product Details

The ADN2892 is a 4.25 Gbps limiting amplifier with integrated loss of signal LOS detection circuitry and a received signal strength indicator RSSI. This part is optimized for Fibre Channel FC and Gigabit Ethernet GbE optoelectronic conversion applications. The ADN2892 has a differential input sensitivity of 3.5 mV p-p and accepts up to a 2.0 V p-p differential input overload voltage. The ADN2892 has current mode logic CML outputs with controlled rise and fall times.

The ADN2892 has a selectable low-pass filter with a −3 dB cutoff frequency of 1.5 GHz. By setting BW_SEL to Logic 0, the filter can limit the relaxation oscillation of a low cost CD laser used in a legacy 1 Gbps FC transmitter. The limited BW also reduces the rms noise and in turn improves the receiver optical sensitivity for a lower data rate application, such as 1× FC and GbE.

By monitoring the bias current through a photodiode, the onchip RSSI detector measures the average power received with 2% typical linearity over the entire valid input range of the photodiode. The on-chip RSSI detector facilitates SFF-8472-compliant optical transceivers by eliminating the need for external RSSI detector circuitry.

Additional features include a programmable loss-of-signal LOS detector and output squelch. The ADN2892 is available in a 3 mm × 3 mm, 16-lead LFCSP.

**Applications**

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1×, 2×, and 4× FC transceivers 

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SFP/SFF/GBIC optical transceivers 

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GbE transceivers 

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Backplane receivers

### Features and Benefits

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Input sensitivity: 3.5 mV p-p 

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70 ps rise/fall times 

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CML outputs: 750 mV p-p differential 

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Bandwidth selectable for multirate 1×/2×/4× FC modules 

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Optional LOS output inversion 

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Programmable LOS detector: 3.5 mV to 35 mV 

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Rx signal strength indicator RSSI 

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SFF-8472-compliant average power measurement 

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Single-supply operation: 3.3 V 

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Low power dissipation: 160 mW 

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Available in space-saving, 3 mm × 3 mm, 16-lead LFCSP 

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Extended temperature range: −40°C to +95°C 

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SFP reference design available