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MITSUBISHI DIGITAL ASSP MITSUBISHI DIGITAL ASSP
M66510P/FP M66510P/FP
LASER-DIODE DRIVER LASER-DIODE DRIVER
DESCRIPTION The M66510 is a semiconductor laser diode driver that drives a semiconductor laser of the type whose cathode and the anode of monitor photodiode are connected to the stem. Laser driving current of up to 120mA can be set by applying constant voltage from outside to drive the laser diode. It operates from a 5V single power supply, allowing switching of laser driving current at a speed of 20M bits/sec. *: Our semiconductor laser is of R type. FEATURES * Built-in two outputs for monitoring laser power (comparator output and analog output) * With laser driving current forced off pin * High-speed switching (20M bits/s) * High driving current (120mA max.) * 5V single power supply APPLICATION Laser beam printer
PIN CONFIGURATION (TOP VIEW)
VCC1 CURRENT SETTING INPUT 1 CURRENT SETTING LOAD OUTPUT 1 CURRENT SETTING INPUT 2 CURRENT SETTING LOAD OUTPUT 2 LASER CURRENT FORCED OFF INPUT CURRENT SETTING LOAD OUTPUT 3 MONITOR LOAD INPUT 1 MONITOR LOAD INPUT 2
1
20 1RO 19 2RO 18 LD
VL1 2 1RC 3 VL2 4 2RC 5 VOFF 6 3RC 7 GND1 8
LASER CURRENT LOAD OUTPUT 1 LASER CURRENT LOAD OUTPUT 2 LASER DIODE OUTPUT MONITOR DIODE INPUT DATA INPUT MONITOR COMPARATOR OUTPUT MONITOR ANALOG OUTPUT DUTY CONTROL INPUT
M66510P/FP
17
GND2
16 PD 15 DATA 14 VCC2
13 CO 12 MO 11 CD
1RM 9 2RM 10
Outline 20P4K
BLOCK DIAGRAM
MONITOR OUTPUT MO 12 COMPARATOR OUTPUT CO 13
1RO 20
2RO 19
LINEAR AMPLIFIER
COMPARATOR (Vref = 1.2V)
CURRENT SETTING VL1 2 INPUT 1 1RC 3 CURRENT SETTING VL2 4 INPUT 2 2RC 5
CONSTANT CURRENT SOURCE (IL1) Max. 60mA
CONSTANT CURRENT SOURCE (IL2) Max. 30mA
3RC 7
CONSTANT CURRENT SOURCE (IL3) Max. 30mA
VCC1 1 VCC2 14 GND2 17 GND1 8 9 1RM 10 16 18 LD LASER DIODE OUTPUT DIFFERENTIAL AMPLIFIER CURRENT SWITCHING CIRCUIT IL = IL1 + IL2 + IL3 11 CD DUTY CONTROL INPUT 15 6
2RM PD MONITOR DIODE INPUT
DATA VOFF DATA INPUT LASER CURRENT FORCED OFF
VL1, 1RC: LASER CURRENT (IL1) SETTING PIN VL2, 2RC: LASER CURRENT (IL2) SETTING PIN 3RC: LASER CURRENT (IL3) SETTING PIN
VCC1, GND1: IC INTERNAL ANALOG POWER SUPPLY PIN VCC2, GND2: IC INTERNAL DIGITAL POWER SUPPLY PIN
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
FUNCTION The 66510 is a semiconductor laser diode driver that drives a semiconductor laser of the type (our R type) whose cathode and the anode of monitor photodiode are connected to the stem. Using the R type laser allows direct fixing the laser on a device for easy installation, thus improving its radiation efficiency. Laser driving current is set by applying voltage from outside. The M66510 is equipped with two independent voltage applying pins to provide higher accuracy of setting the current value.
It is also equipped with a laser current forced off pin to prevent overcurrent from flowing into the laser diode at the power-ON time. For detection of laser power, the monitor current of monitor photodiode built in the laser is converted into voltage by an external resistor to generate an analog output, and simultaneously the result of comparison with the internal reference voltage is output as TTL-level logic information.
PIN DESCRIPTIONS
Pin name LD PD VL1 1RC VL2 2RC 3RC DATA 1RM, 2RM MO CO VOFF 1RO 2RO CD VCC1 VCC2 GND1 GND2 Name Laser connecting pin Monitor diode connecting pin Voltage input pin for IL1 setting Load resistor connecting pin for IL1 setting Voltage input pin for IL2 setting Load resistor connecting pin for IL2 setting Load resistor connecting pin for IL3 setting Switching data input pin Monitor load resistor connecting pin Monitor analog output pin Monitor comparator output pin Laser current forced off input pin Load resistor connecting pin for laser current IL1 Load resistor connecting pin for laser current IL2/IL3 Duty compensating capacitor connecting pin Power supply pin 1 Power supply pin 2 GND pin 1 GND pin 2 Function Connects the anode of semiconductor laser diode. Connects the cathode of monitor photodiode. Voltage input for setting the output current (IL1) of current source 1. Connects IL1 setting load resistor between the pin and GND. Voltage input for setting the output current (IL2) of current source 2. Connects IL2 setting load resistor between the pin and GND. Connects IL3 setting load resistor between the pin and GND. If IL3 is not used, open the pin. Turns on the laser in the "L" position, and off in the "H" position. Connects between 1RM and 2RM the load resistor for converting monitor photodiode current into voltage. Analog output for monitoring laser power. Comparator output for monitoring laser power. Turns off all current source circuits in the "L" position. Connects load resistor for laser current IL1 between 1RO pin and VCC. Connects load resistor for laser current IL2 and IL3 between 2RO pin and VCC. Connects duty compensating capacitor of optical output switch waveforms between the pin and GND. If duty compensation is not required, open the pin. Power supply for internal analog circuits. Connected to positive power supply (+5V). Power supply for internal digital circuits. Connected to positive power supply (+5V). GND for internal analog circuits. GND for internal digital circuits.
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
DESCRIPTION OF OPERATION 1. Setting laser driving current The M66510 is provided internally with three constant current sources IL1, IL2 and IL3, allowing setting of each independent output current. The methods of setting IL1 to IL3 are given below in (1) to (3). (1) Method of setting IL1 IL1 is approximated by the VL1 pin input voltage and the resistor (RC1) connected between 1RC pin and GND as follows: VL1[V] IL1[mA] = 12 x RC1[k] However, 0 VL1 VCC - 1.8V, IL1(max.) = 60mA (2) Method of setting IL2 IL2 is approximated by the VL2 pin input voltage and the resistor (RC2) connected between 2RC pin and GND as follows: VL2[V] IL2[mA] = 6 x RC2[k] However, 0 VL2 Vcc - 1.8V, IL2(max.) = 30mA (3) Method of setting IL3 IL3 is approximated by the internal reference voltage (Vref) and the resistor (RC3) connected between 3RC pin and GND as follows: Vref[V] IL3[mA] = 10 x RC3[k] However, Vref = 1.2V (standard), IL3(max.) = 30mA
Note: The expressions for setting IL1 to IL3 are typical. Actually, the set values fluctuate several % depending on IC lot dispersion or operating ambient temperature (See the ELECTRICAL CHARACTERISTICS).
(2) The VM is output as an analog output from the MO pin through the buffer amplifier and compared to the internal reference voltage Vref (1.2V standard) by the comparator. Then the result of comparison is output from the CO pin on the TTL level.
- + VM RM - Differential amplifier LD PD Vref + CO output - Comparator + Buffer amplifier MO output
Condition VM < Vref VM > Vref
CO output "L" "H"
Monitor circuit schematic drawing
2. Switching operation The laser is turned on when DATA = "L". At this time, the laser driving current is IL1 + IL2 + IL3. The laser is turned off when DATA = "H". At this time, the laser driving current becomes almost 0 regardless of IL1 to IL3. 3. Usage of VOFF input The current which flows into the laser becomes 0 when DATA = "H". And the laser is turned off but the internal current sources are active. Contrarily, the internal current sources are turned off when VOFF = "L". It is therefore possible to prevent overcurrent from flowing into the laser by setting VOFF input to "L" until VCC reaches 3.5V (standard) at the power-ON time, for example (See 6. Internal reset). 4. Laser power monitor operation The M66510 outputs the information on monitor photodiode (PD) built in the laser from the MO and CO pins in the flow given below. (1) The current equal to the PD current produced through emission of the laser flows into the resistor (RM) connected between 1RM and 2RM. The potential difference (VM) produced on RM is converted into a level from GND by the internal differential amplifier.
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
5. 1RO/2RO pin The 1RO pin is used to connect the load resistor (RO1) for current source 1 (IL1). The 2RO pin is used to connect the load resistor (RO2) for current sources 2 (IL2) and 3 (IL3). Connecting the load resistor between each pin and Vcc reduces IC internal power dissipation. Set a resistance value so that each pin voltage does not go down to 3.5V or less. In other words, set a value such as meets the following expression: RO1(RO2)[] VCC - 3.5[V] Maximum load current [A] flowing into RO1(RO2)
Ex: When VCC = 5V and maximum load current of each source is 60mA, RO1 and RO2 will be 25 or less.
6. Internal reset operation The M66510 is provided with an internal reset circuit to prevent overcurrent from flowing into the laser at the power-ON time. The reset circuit operates within the range of VCC < 3.5V (standard) to turn off all the current sources. 7. VCC/GND pin The power supply pins include VCC1, VCC2, GND1 and GND2, each of which is as follows in terms of internal circuit: VCC1/GND1: Connected to an analog circuit. VCC2/GND2: Connected to a digital circuit. In actual wiring, pay attention to the following: (1) Make wiring width as wide as possible. Avoid redundant wiring. (2) Lay out an electrolytic capacitor for stabilizing voltage as close to VCC1/GND1 as possible. (3) Lay out a bypass capacitor as close to VCC2/GND2 as possible. Precaution for peripheral element wiring Lay out the peripheral elements required for M66510 operation as close to M66510 as possible.
Method of calculating power dissipation The power dissipation P of M66510 is given by the expression given below. P = ICC x VCC + I(1RO) x (V(1RO) - V(LD)) + I(2RO) x (V(2RO) - V(LD)) + IOL(CO) x VOL(CO) where, V(1RO) : 1RO pin voltage V(2RO) : 2RO pin voltage I(1RO) : 1RO pin load current I(2RO) : 2RO pin load current V(LD) : LD pin voltage IOL(CO) : CO pin "L" output current VOL(CO) : CO pin "L" output voltage For example, when VCC = 5.25V, V(1RO) = V(2RO) = 3.5V, I(1RO) = I(2RO) = 60mA, V(LD) = 2.5V, IOL(CO) = 8mA and VOL(CO) = 0.5V, the power dissipation at the laser-ON/OFF time is as follows: (1) Laser-ON time (DATA = "L", ICC=26mA) PON = 26 x 5.25 + 60 x (3.5 - 2.5) + 60 x (3.5 - 2.5) + 8 x 0.5 = 260.5(mW) (2) Laser-OFF time (DATA = "H", ICC = 44mA) POFF = 44 x 5.25 + 0 + 0 + 8 x 0.5 = 235(mW)
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
OPERATING WAVEFORM
P0
Laser output P
Laser output
Laser current lL lL3 lL1 lL2
lL1 : 0 ~ 60mA lL2 : 0 ~ 30mA lL3 : 0 ~ 30mA
Driving current pulse
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IL1 IL2 IL3 Pd Tstg Parameter Supply voltage Input voltage Output current Output current 1 Output current 2 Output current 3 Power dissipation Storage temperature DIP SOP IC unit, when Ta=25C (Note 1) IC unit, when Ta=25C (Note 2) VL1, VL2 DATA, VOFF CO 1RO, 2RO Conditions Ratings -0.5 ~ +7.0 -0.3 ~ VCC -0.3 ~ + 7 -0.3 ~ + 5.5 -0.3 ~ + 7 -90 -45 -45 1300 800 -65 ~ 150 Unit V V V mA mA mA mW C
When output is "H"
Note 1: When Ta 25C, do derating of 10.4mW/C. 2: When Ta 25C, do derating of 6.4mW/C.
RECOMMENDED OPERATINIG CONDITIONS
Symbol VCC IL1 IL2 IL3 Topr Parameter Supply voltage Output current 1 Output current 2 Output current 3 Operating ambient temperature Conditions Min. 4.75 Limits Typ. 5 Max. 5.25 -60 -30 -30 75 Unit V mA mA mA C
-20
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
ELECTRICAL CHARACTERISTICS (VCC = 5V 5%, Ta = -20 ~ 75C, unless otherwise noted)
Symbol VIH VIL VI VOH VOL VLD VOS VM Parameter "H" input voltage "L" input voltage Upper limit of effective input voltage "H" output voltage "L" output voltage Operating supply voltage Output offset voltage Output voltage variance width DATA, VOFF DATA, VOFF VL1, VL2 CO CO LD MO Test conditions Min. 2 VCC-1.8 2.7 Limits Typ.* Max. 0.8 VCC-1.4 0.4 0.5 2.5 30 20 0.05 20 -0.2 1 1.2 -1.1 -0.7 -62 0.037 -31 0.017 -31 -0.2 -1 17 30 IOH=-400mA IOL=4mA IOL=8mA Unit V V V V V V mV mV mV/C mA mA mA V mV/C mA mA/C mA mA/C mA mA mA
0
II
Input current
IMO=20mA, IPD=0mA (Note 3) IPD=-0.2~2.0mA, IMO=20mA, MO RM=1k (Note 4) Temperature coefficient RM=1k, IPD=-1.2mA VI=2.7V DATA, VOFF VI=0.4V VL1, VL2 VI=0~VCC Ta=-20~75C Temperature coefficient Ta=25~75C VL1=3V, RC1=560, VLD=2V LD
Temperature coefficient
Vref
Reference voltage
IL1 IL2 IL3 IOFF
Output current 1 (Note 5) Output current 2 (Note 5) Output current 3 (Note 5) Off-state output current
LD LD LD
VL2=3V, RC2=560, VLD=2V
Temperature coefficient
ICC
Supply current
RC3=360, VLD=2V VOFF=DATA=2V VOFF=DATA=0.8V VCC=5.25V, VOFF=4.5V, DATA=0V VL1=VL2=3.0V, RC1=RC2=560, RC3=360, DATA=4.5V 1RO, 2RO, LD open
-1 -20 26
mA 44
Note 3: IMO: MO pin output current. IPD: PD pin input current 4: RM: Resistance connected between 1RM and 2RM pins. 5: This indicates the input voltage - output current conversion characteristic. Use IL1 to IL3 within the range of limits of the recommended operating conditions. *: The standard value is given on VCC = 5V and at Ta = 25C. The items with Ta specified under test conditions are given on VCC = 5V.
ELECTRICAL CHARACTERISTICS (VCC = 5V, Ta = 25C)
Symbol fOP tRP1 Parameter Operating frequency Circuit response time 1 VL1/VL2 voltage LD current ILD(L)=0mA, ILD(H)=-60mA (Note 6) ILD(L)=-55mA, ILD(H)=-65mA (Note 6) IPD(L)=0mA, IPD(H)=-2mA, RM=1k (Note 7) |IPD|=0.2mA, RM=1k (Note 7) |IPD|=1mA (Note 7) |IPD|=0.2mA (Note 7) ILD(H)=-60mA (Note 8) ILD(H)=-60mA (Note 8) Test pin Input Output Test conditions Min. Limits Typ. 20 4.5 0.5 7 1 7 0.5 3 0.5 Max. Unit Mbps 7 ms 2 10 ms 3 10 2 5 2
tRP2
Circuit response time 2
PD current
MO voltage CO voltage
tRP3 tON tOFF
Circuit response time 3 Circuit ON time Circuit OFF time
PD current
ms ms ms
VOFF voltage LD current VOFF voltage LD current
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
NOTE 6: TEST CIRCUIT
NOTE 7: TEST CIRCUIT
5V Oscilloscope (input) VL1 P.G. tr = tf = 6ns 50 560 560 VL2 1RC 2RC 20 VCC 1RO 2RO LD PD lLD 20 20 VL1 VL2 Current probe Oscilloscope (output) 560 560 1RC 2RC 1RM RM 2RM GND CO 2RM MO GND VCC 1RO 2RO DATA PD lPD 20
5V
Oscilloscope (input) Current probe P.G. 50 tr = tf = 6ns
1RM DATA
Oscilloscope (output) Other pins are open.
Other pins are open.
TIMING CHART
VIH VL1, VL2 50% tRP1 50% VIL tRP1 90% ILD 10% ILD(L) ILD(H)
TIMING CHART
50% IPD tRP2, tRP3 MO=10% CO=1.5V tRP2, tRP3 MO=90% CO=1.5V 50% | |
IPD | IPD |
IPD(H) IPD(T)( V ) IPD(L)
VOH
MO, CO
VOL
V
: IPD when CO output is inverted.
NOTE 8: TEST CIRCUIT
5V 20 VL1 VL2 560 560 1RC 2RC VCC 1RO 2RO LD PD ILD 20
Current probe Oscilloscope (output)
Oscilloscope (input)
1RM DATA 2RM
P.G. tr = tf = 6ns 50
VOFF GND
Other pins are open.
TIMING CHART
1.5V VOFF 0V tOFF tON 90% ILD 10% ILD(L) ILD(H) 1.5V 3V
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
APPLICATION EXAMPLE
Control circuit 5V M66510 MO 12 Linear amplifier 13 Comparator (Vref = 1.2V) CO RO1 1RO RO2 20 20 2RO 19 20
VL1 RC1 560 1RC VL2 RC2 560 5V RC3 360 2RC
2 3
Constant current source (IL1) Max. 60mA Constant current source (IL2) Max. 30mA Constant current source (IL3) Max. 30mA
4 5
3RC
7
VCC1 0.1mF 0.22mF VCC2 GND2 GND1
1 14 17 8 9 10 16 18 PD LD Differential amplifier Power supply switching circuit IL = IL1 + IL2 + IL3 2RM CD 91pF RM 3k ML4403R Data stream Control signal 11 15 DATA 6 VOFF
1RM
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
STANDARD CHARACTERISTICS (VCC = 5V, Ta = 25C)
LASER CURRENT - CURRENT SETTING VOLTAGE CHARACTERISTIC
LASER CURRENT - RC3 RESISTANCE CHARACTERISTIC
-100
-50
LASER CURRENT IL1, IL2 (mA)
IL1 + lL2
-80
IL1(RC1=560)
LASER CURRENT IL3 (mA)
-40
-60
-30
IL2(RC2=560)
-40
-20
-20
-10
0 0 1 2 3 4 5
0 0.2
0.4
0.6
0.8
1.0
1.2
CURRENT SETTING INPUT VOLTAGE VL1, VL2 (V)
RC3 RESISTANCE (k)
MO OUTPUT - MONITOR CURRENT CHARACTERISTIC
CO OUTPUT - MONITOR CURRENT CHARACTERISTIC
MONITOR ANALOG OUTPUT VMO (V)
5
MONITOR COMPARATOR OUTPUT VCO (V)
5
4
VMO
3
4
3
2
2
RM=1k
1
RM=1k
1
0 0 -1 -2 -3 -4 -5
0 -0.8
-1.0
-1.2
-1.4
-1.6
-1.8
MONITOR CURRENT IPD (mA)
MONITOR CURRENT IPD (mA)
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MITSUBISHI DIGITAL ASSP
M66510P/FP
LASER-DIODE DRIVER
EVALUATION OF SWITCHING OPERATION WAVEFORM
Connector 0.1mF VCC 1 GND 2 RC1 VL1 3 680 VL2 4 RC2 VOFF 5 680 GND 6 JP CO 7 (Open) 390 MO 8 DATA 9 PD 10 8 GND1 9 1RM 10 2RM CO 13 MO 12 CD 11 91pF Oscilloscope (laser beam output) RC3 7 3RC VCC2 14 0.1 mF ML4403R Directly mounted on PC board 50 6 VOFF DATA 15 Laser power meter 5 2RC PD 16 Laser beam output 4 VL2 GND 17 3 1RC LD 18 22mF 1 VCC1 2 VL1 1RO 20 2RO 19 500 75pF RO 12 (V) (V) RLD CLD VCC = 5V Ta = 25C
RM 3k
Oscilloscope (data input) P.G. (Note 9) 50
V : The RLD and CLD optimum values depend on a type of laser used and a PCB pattern.
Note 9: tr = tf = 6ns, VO = 3Vp-p, duty = 50%
EVALUATION CIRCUIT
SWITCHING OPERATION WAVEFORM
2Mbit/s (t: 200ns/div) DATA input (2V/div) 3V 0V 5Mbit/s (t: 100ns/div)
3mW Laser beam output (1mW/div) 0mW
10Mbit/s (t: 50ns/div)
20Mbit/s (t: 20ns/div)
Note: The delay from DATA input to laser beam output includes a measurement delay.
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