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AN-761 Application Note5/25/2005
Overview
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
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
- 1×, 2×, and 4× FC transceivers
- SFP/SFF/GBIC optical transceivers
- GbE transceivers
- Backplane receivers
Product Categories
Product Lifecycle
Not Recommended for New Designs
This designates products ADI does not recommend broadly for new designs.
Evaluation Kits (1)
Documentation & Resources
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SFP Reference Design Kit1/1/2000
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| 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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