ADN2872 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver
Like the ADN2870, the ADN2872 laser diode driver is designed
for advanced SFP and SFF modules, using SFF-8472 digital
diagnostics. The device features dual-loop control of the average
power and extinction ratio (ER), which automatically compensates
for variations in laser characteristics over temperature and aging.
The laser needs only be calibrated at 25°C, eliminating the need
for expensive and time consuming temperature calibration. The
ADN2872 supports single-rate operation from 50 Mbps to
3.3 Gbps, or multirate operation from 155 Mbps to 3.3 Gbps.
With a new alarm scheme, this device avoids the shutdown issue
caused by the system transient generated from various lasers.
The average power and ER can be set with a voltage provided by
a microcontroller digital-to-analog converter (DAC) or by a
trimmable resistor. The device provides both bias and modulation
current monitoring, as well as fail alarms and automatic laser
shutdown. The ADN2872, a SFF-/SFP-compliant laser diode driver,
can work with the Analog Devices, Inc., ADuC7019, ADuC7020,
and ADuC7023 MicroConverter® family and the ADN2890,
ADN2891, and ADN2892 limiting amplifier family, to form a
complete SFP/SFF transceiver solution. The ADN2872 is available
in a space-saving 4 mm × 4 mm LFCSP specified over the
−40°C to +85°C temperature range.
Applications
Features and Benefits- SFP/SFF and SFF-8472 MSA compliant
- SFP reference design available
- Any rate from 50 Mbps to 3.3 Gbps operation
- Dual-loop control of average power and extinction ratio
- Typical rise/fall time: 60 ps
- Bias current range: 2 mA to 100 mA
- Modulation current range: 5 mA to 90 mA
- Laser FAIL alarm and automatic laser shutdown (ALS)
- Bias and modulation current monitoring
- 3.3 V operation
- 4 mm × 4 mm LFCSP
- Voltage setpoint control
- Resistor setpoint control
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Data Sheets
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| ADN2872ACPZ Production | 24 ld LFCSP (4x5mm w/2.30mm EP) | OTH 490 | -40 to 85C | 5.01 | 4.78 | Y |
| ADN2872ACPZ-R7 Production | 24 ld LFCSP (4x5mm w/2.30mm EP) | REEL 1500 | -40 to 85C | 0 | 4.78 | Y |
| ADN2872ACPZ-RL Last Time Buy | 24 ld LFCSP (4x5mm w/2.30mm EP) | REEL 5000 | -40 to 85C | 0 | 4.78 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVALZ-ADN2872 | Evaluation Board | -1 | Y |
