155Mbps to 2.5Gbps Burst-Mode Laser Driver
8 Maxim Integrated
MAX3643
Pin Description
PIN NAME FUNCTION
1 V
CCA
Analog Supply Voltage
2 IN+ Noninverted Data Input, LVPECL Compatible
3 IN- Inverted Data Input, LVPECL Compatible
4 V
CCS
Signal Supply Voltage
5 BEN+ Noninverted Burst-Enable Input, LVPECL Compatible
6 BEN- Inverted Burst-Enable Input, LVPECL Compatible
7 BENOUT Burst-Enable Output, LVCMOS. Signal replicates BEN input.
8 EN Enable Input LVCMOS. Active low enables BIAS± and OUT± outputs.
9 BCMON
Bias Current Monitor. Current out of this pin develops a ground-referenced voltage across an
external resistor proportional to the bias current.
10 IMAX Current-Limit Reference. Connect a resistor from IMAX to GND to set maximum I
BIAS
plus I
MOD
.
11 MDOUT Monitor Diode Out. Analog Output for sample/hold.
12 MDIN Monitor Diode In. Analog Input for sample/hold.
13 BIAS- Connect BIAS- to V
CC
Through a 10 Resistor and Switching Diode
14 BIAS+ Laser Bias Current Output. Modulation current flows into this pin when BEN input is high.
15, 18 V
CCO
Output Supply Voltage
16 OUT+
Laser Modulation Current Output. Modulation current flows into this pin when both BEN and IN
inputs are high.
17 OUT- Connect OUT- to Laser Diode Anode Through a 15 Resistor and Switching Diode
19 GND Supply Ground. This pin must be connected to ground.
20 MODSET Modulation Current Set. Current from this pin to ground sets the laser modulation current.
21 VMSET MODSET Reference. A ground-referenced voltage at this point establishes the MODSET reference.
22 VREF Reference Voltage Output. May be used for VMSET, VBSET.
23 VBSET BIASSET Reference. A ground-referenced voltage at this point establishes the BIASSET reference.
24 BIASSET Bias Current Set. Current from this pin to ground sets the laser bias current.
— EP
Exposed Paddle (Ground). The exposed pad must be soldered to the circuit board ground for proper
thermal and electrical operation.
