M61880FP

MITSUBISHI < DIGITAL ASSP > M61880FP Laser-diode driver / controller DESCRIPTION The M61880FP is a semiconductor laser-diode driver/ controller. Its functions are the driving and laser power control of a specific type(Mitsubishi's N-type laser)of semiconductor laser diode,in which the anode of a semiconductor laser diode is connected in stem structure to the cathode of a monitoring photodiode. The IC has a laser drive current output pin of sink type and is capable of driving a laser diode on a maximum bias current of 40mA and a maximum switching current of 100 mA,which is switching at a rate of 200Mbps. Since the M61880FP has a built in sample-hold circuit,it is possible to realize an internal APC* system that requires no external device for laser power control. *:Automatic Power Control PIN CONFIGURATION (TOP VIEW) OUTPUT TO SWITCHING CURRENT SETTING LOAD RS 1 20 19 18 17 16 15 14 13 12 11 Vcc2 RO NC LD GND2 PD MONITORING DIODE INPUT SWITCHING DATA INPUT LASER CURRENT OUTPUT LASER CURRENT LOAD OUTPUT GND1 2 OUTPUT TO BIAS CURRENT SETTING LOAD BIAS CURRENT SETTING VOLTAGE INPUT REFERENCE VOLTAGE OUTPUT REFERENCE VOLTAGE INPUT HOLDING CAPACITOR LOAD INPUT/OUTPUT SAMPLE-HOLD CONTROL INPUT RB VB 3 4 5 6 7 8 Vref Vr CH S/H FEATURES Built-in sample-hold circuit for internal APC function Hold error voltage is less than 1% for 1µs(C=0.047µF) High speed switching 200Mbps Large driving current 100mA (max) Capable of setting bias current (40mA max) 5V single power supply ...