ADN2870 3.3 V, Dual Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver

The ADN2870 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, which automatically compensates for variations in laser characteristics over temperature and aging. The laser needs only to be calibrated at 25°C, eliminating the expensive and time consuming temperature calibration. The ADN2870 supports single-rate operation from 50 Mbps to 3.3 Gbps or multirate operation from 155 Mbps to 3.3 Gbps.

Average power and extinction ratios can be set with reference voltages provided by a microcontroller DAC or by adjustable resistors. The ADN2870 provides bias and modulation current monitoring as well as fail alarms and automatic laser shutdown. The device interfaces easily with the ADuC702x family of MicroConverters® and with the ADN289x family of limiting amplifiers to make a complete SFP/SFF transceiver solution. An SFP reference design is available. The product is available in a space-saving 4 mm × 4 mm LFCSP specified over the −40°C to +85°C temperature range.

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

Features and Benefits

SFP/SFF MSA and SFF-8472 compliant

SFP reference design available

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

RoHS compliant

Optical

Laser Drivers

Data Sheets

Document	note
ADN2870: 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver Data Sheet (Rev. B)	PDF 693.6 K

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADN2870ACPZ Production	24 ld LFCSP (4x5mm w/2.30mm EP)	OTH 490	-40 to 85C	5.57	5.31	Y
ADN2870ACPZ-RL Last Time Buy	24 ld LFCSP (4x4mm w/2.30mm EP)	REEL 5000	-40 to 85C	0	5.31	Y
ADN2870ACPZ-RL7 Production	24 ld LFCSP (4x5mm w/2.30mm EP)	REEL 1500	-40 to 85C	0	5.31	Y
AN60/010Z-500R7 Obsolete	24 ld LFCSP (4x4mm w/2.30mm EP)	OTH 500		0	0	Y

Evaluation Boards

Part Number	Description	Price	RoHS
EVALZ-ADN2870	Evaluation Board	354.2	Y

Reference Materials

Circuit Notes：SFP Reference Design Kit

ADN2870: 3.3 V Dual-Loop, 50 Mbps to 3.3 Gbps Laser Diode Driver Data Sheet (Rev. B) adn2870

SFP Reference Design Kit aduc7020