AN-761 Application Note5/25/2005
Features and Benefits
- Input sensitivity: 3.5 mV p-p
- 70 ps rise/fall times
- CML outputs: 750 mV p-p differential
- Bandwidth selectable for multirate 1×/2×/4× FC modules
- Optional LOS output inversion
- Programmable LOS detector: 3.5 mV to 35 mV
- Rx signal strength indicator (RSSI)
- SFF-8472-compliant average power measurement
- Single-supply operation: 3.3 V
- Low power dissipation: 160 mW
- Available in space-saving, 3 mm × 3 mm, 16-lead LFCSP
- Extended temperature range: −40°C to +95°C
- SFP reference design available
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.
- 1×, 2×, and 4× FC transceivers
- SFP/SFF/GBIC optical transceivers
- GbE transceivers
- Backplane receivers
Product Lifecycle Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
Documentation & Resources
SFP Reference Design Kit1/1/2000
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|ADN2892ACPZ-500RL7||Material Declaration||Reliability Data||16-Lead LFCSP (3mm x 3mm w/ EP)|
|ADN2892ACPZ-RL7||Material Declaration||Reliability Data||16-Lead LFCSP (3mm x 3mm w/ EP)|
|Wafer Fabrication Data|
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