Overview
The ADN2872ACPZ-RL is a laser diode driver integrated circuit designed by Analog Devices Inc. for advanced Small Form Factor (SFF) and Small Form-factor Pluggable (SFP) modules. This device is optimized for controlling high-power single-mode lasers and is compliant with SFF-8472 digital diagnostics. It features dual-loop control of the average power and extinction ratio (ER), which automatically compensates for variations in laser characteristics over temperature and aging, eliminating the need for expensive temperature calibration.
The ADN2872 supports single-rate operation from 50 Mbps to 3.3 Gbps and multirate operation from 155 Mbps to 3.3 Gbps, making it versatile for various fiber optic applications. It also includes bias and modulation current monitoring, fail alarms, and automatic laser shutdown (ALS) to ensure reliable operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Conditions/Comments |
|---|---|---|---|---|---|
| Laser Bias Current (IBIAS) | 2 | 100 | 100 | mA | Output Current, IBIAS when ALS High: 0.2 mA |
| Compliance Voltage (IBIAS) | 1.2 VCC | V | |||
| Modulation Current (IMODP, IMODN) | 5 | 90 | 90 | mA | Output Current, IMOD when ALS High: 0.05 mA |
| Compliance Voltage (IMOD) | 1.5 VCC | V | |||
| Rise Time | 60 | 104 | 104 | ps | |
| Fall Time | 60 | 96 | 96 | ps | |
| Random Jitter | 0.8 | 1.1 | 1.1 | ps rms | |
| Deterministic Jitter | 35 | ps | 20 mA < IMOD < 90 mA | ||
| Pulse Width Distortion | 30 | ps | 20 mA < IMOD < 90 mA | ||
| Average Power Set (PAVSET) Pin Capacitance | 80 | pF | Voltage: 1.1 to 1.2 V |
Key Features
- Dual-loop control of average power and extinction ratio (ER) to compensate for variations in laser characteristics over temperature and aging.
- Supports single-rate operation from 50 Mbps to 3.3 Gbps and multirate operation from 155 Mbps to 3.3 Gbps.
- Bias and modulation current monitoring.
- Fail alarms and automatic laser shutdown (ALS).
- 3.3 V operation with a temperature range of −40°C to +85°C.
- Space-saving 4 mm × 4 mm LFCSP package.
- Compatible with SFF-8472 digital diagnostics.
- Can be controlled by a microcontroller digital-to-analog converter (DAC) or a trimmable resistor.
Applications
- Multirate OC3 to OC48-FEC SFP/SFF modules.
- 1×/2×/4× Fibre Channel SFP/SFF modules.
- LX-4 modules.
- DWDM/CWDM SFP modules.
- 1GE SFP/SFF transceiver modules.
Q & A
- What is the primary function of the ADN2872ACPZ-RL?
The ADN2872ACPZ-RL is a laser diode driver designed for controlling current and voltage in high-power single-mode lasers, particularly in SFP and SFF modules.
- What are the supported data rates for the ADN2872ACPZ-RL?
The device supports single-rate operation from 50 Mbps to 3.3 Gbps and multirate operation from 155 Mbps to 3.3 Gbps.
- What type of control does the ADN2872ACPZ-RL use for average power and extinction ratio?
The device uses dual-loop control to maintain the average power and extinction ratio, compensating for variations in laser characteristics over temperature and aging.
- What safety features does the ADN2872ACPZ-RL include?
The device includes fail alarms and automatic laser shutdown (ALS) to ensure reliable operation.
- How is the ADN2872ACPZ-RL controlled?
The device can be controlled by a microcontroller digital-to-analog converter (DAC) or a trimmable resistor.
- What is the operating voltage of the ADN2872ACPZ-RL?
The operating voltage is 3.3 V.
- What is the temperature range of the ADN2872ACPZ-RL?
The device operates over a temperature range of −40°C to +85°C.
- What package type is the ADN2872ACPZ-RL available in?
The device is available in a 4 mm × 4 mm LFCSP package.
- Is the ADN2872ACPZ-RL compatible with any specific diagnostics standards?
Yes, it is compatible with SFF-8472 digital diagnostics.
- What are some common applications of the ADN2872ACPZ-RL?
Common applications include multirate OC3 to OC48-FEC SFP/SFF modules, Fibre Channel modules, LX-4 modules, DWDM/CWDM SFP modules, and 1GE SFP/SFF transceiver modules.
