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Laser Driver for Projectors

MAX3600

General Description

The MAX3600 laser driver for projectors supports video

imaging with red, blue, and green lasers. Each output

includes a 10-bit video digital-to-analog converter (DAC)

with programmable gain and offset. For operation with

synthetic green lasers, the driver includes a periodic off

function and a fourth output with a random-noise generator.

The MAX3600B/R/G are monochrome drivers for blue,

red, and green lasers. The MAX3600A guarantees

higher full-scale output currents than the MAX3600, and

is recommended for new designs.

Applications

RGB Pico Laser Projector

Up to WXGA and 1080p Resolution Projectors

Monochrome Blue, Green, or Red Pico Laser

Projector

Features

S Integrates Four Current-Output Laser Drivers

S Compatible with Red, Blue, and Green Lasers

S 10-Bit Video DACs, f

CLK

= 1MHz to 160MHz

S 8-Bit Gain and Offset DACs

S 2ns Output Switching Time

S Serial Port Control

S Laser Enable

S Random-Noise Generator and Periodic Off

S 5mm x 5mm, 40-Pin TQFN Package (0.4mm Pitch)

19-4720; Rev 2; 8/10

Simplified Functional Diagram

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

†

Not recommended for new designs.

††

Future product—contact factory for availability.

Typical Operating Circuits and Pin Configuration appear at

end of data sheet.

MAX3600

MAX3600A

VIDEO1

SYNC

10-BIT VIDEO

3-WIRE BUS

OUTPUT ENABLE

OUT1

OUT2

OUT4

OUT3

CCD

BLUE LASER

CCA

VEE_T, V

GREEN

RED

NOISE

BLUE

VIDEO DEMULTIPLEXER

SERIAL PORT

CLK

REF

SDA

SCL

CONTROL LOGIC

EN_MAIN

OUTPUT 2

OUTPUT 1

VIDEO2

PRBS NOISE

GENERATOR

OUTPUT 4

PERIODIC OFF

OUTPUT 3VIDEO3

RED LASER

NOISE DIODE

GREEN LASER

PART TEMP RANGE PIN-PACKAGE

MAX3600CTL+

†

0NC to +70NC

40 TQFN-EP*

MAX3600ACTL+

0NC to +70NC

40 TQFN-EP*

MAX3600RCTL+

††

0NC to +70NC

40 TQFN-EP*

MAX3600GCTL+

††

0NC to +70NC

40 TQFN-EP*

MAX3600BCTL+

††

0NC to +70NC

40 TQFN-EP*

Summary of content (23 pages)

PAGE 1
9-4720; Rev 2; 8/10 Laser Driver for Projectors The MAX3600B/R/G are monochrome drivers for blue, red, and green lasers. The MAX3600A guarantees higher full-scale output currents than the MAX3600, and is recommended for new designs.
PAGE 2
MAX3600 Laser Driver for Projectors ABSOLUTE MAXIMUM RATINGS Supply Voltage Range, VCCA, VCCD....................-0.3V to +4.0V Voltage Range at VA1, VA2, VA4...........................-0.3V to +6.0V Voltage Range at VA3...........................................-0.3V to +8.5V Voltage Range at OUT1............................ -0.3V to (VA1 + 0.3V) Voltage Range at OUT2............................ -0.3V to (VA2 + 0.3V) Voltage Range at OUT3............................ -0.3V to (VA3 + 0.
PAGE 3
Laser Driver for Projectors MAX3600 ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V Q5%, TA = 0NC to +70NC, TJ P +125NC, EN_MAIN high, VC_ R 0.9V, unless otherwise noted.
PAGE 4
MAX3600 Laser Driver for Projectors ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V Q5%, TA = 0NC to +70NC, TJ P +125NC, EN_MAIN high, VC_ R 0.9V, unless otherwise noted.) (Note 1, Equation 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS (102) MHz (1040) kHz (150) MHz PO GENERATOR Pixel Clock Range for PO Operating condition Minimum PO Pulse Width Four subpixels PLL Bandwidth 24 3.
PAGE 5
Laser Driver for Projectors PIXEL TIME (ns) VIDEO CODE DBITS 0 0 1111111111 — — 1 10 0000000000 10 1.0 2 20 0111111111 9 0.9 3 30 1000000000 10 1.0 4 40 1000000001 1 0.1 RC MAX3600 Table 1.
PAGE 6
Typical Operating Characteristics (VCC = 3.3V, TA = +25NC, EN_MAIN high, unless otherwise noted. VC_ = VA_ - VOUT_.) 1.2 0.6 0.4 0.2 0.4 0.2 LSB 0.8 0 0 -0.2 -0.4 -0.2 -0.4 -0.8 -0.4 -0.6 -1.2 -0.6 -0.8 -1.6 -0.8 -1.0 -2.0 400 600 800 1000 0 200 400 600 800 -1.0 1000 0 800 VIDEO DNL OUT1 (gs1 = 20h, TA = -40°C) VIDEO DNL OUT2 (gs2 = 20h, TA = -40°C) VIDEO DNL OUT3 (gs3 = 20h, TA = -40°C) 1.6 1.2 1.0 0.8 0.6 0.4 0.2 0.4 0.2 LSB 0.8 LSB 0.4 0 0 0 -0.2 -0.4 -0.
PAGE 7
Laser Driver for Projectors gs4 = FFh 2.0 MAX3600 toc11 MAX3600 toc10 90 70 MAX3600 toc12 GAIN DNL VIDEO INL OUT4 VIDEO DNL OUT4 28 VIDEO_ = 3FFh 1.2 OUT1, OUT2, OUT3, OUT4 18 50 LSB LSB LSB 0.4 gs4 = FFh, TJ = +125°C, VC_ = 0.9V 30 -0.4 10 -1.2 8 gs4 = 20h, TA = -40°C 400 600 800 1000 200 0 400 VIDEO CODE 800 -2.
PAGE 8
Typical Operating Characteristics (continued) (VCC = 3.3V, TA = +25NC, EN_MAIN high, unless otherwise noted. VC_ = VA_ - VOUT_.) 100 OUT2 5 RISE TIME (ns) OUT3 OUT4 90 85 80 OUT1 75 VIDEO IS SQUARE WAVE: 3FFh (HIGH), 0 (LOW) 70 0 0.3 0.6 0.9 1.2 4 3 OUT4 OUT3 1 0.7 0.5 1.5 OUT2 OUT1 0.9 1.1 OUT4 3 1 OUT1 1.3 0.6 0.4 1.5 0.8 gs_ = 40h, os_ = FFh 5 3 OUT3 OUT2 2 OUTPUT FALL TIME vs. COMPLIANCE VOLTAGE (VA_ - VOUT_) 3.0 gs_ = FFh, os_ = 0 2.5 FALL TIME (ns) 4 1.
PAGE 9
Laser Driver for Projectors PIN NAME 1 D0 2 D1 3 D2 4 D3 5 D4 6 D5 7 D6 8 D7 9 D8 MAX3600 Pin Description FUNCTION Synchronous Video Data Inputs. D0 is the LSB; D9 is the MSB. 10 D9 11 SYNC 12 CLK Video Clock Input 13 RES Reserved for Future Use. Leave open. 14 OUT3 15 VA3 Blue Laser Supply Voltage 16, 24, 32 VEE Ground Connections. Connect to 0V.
PAGE 10
MAX3600 Laser Driver for Projectors Detailed Description OUTPUT1, OUTPUT2, and OUTPUT3 support operation with red, green, and blue lasers. OUTPUT4 and the PRBS generator provide noise as required for certain synthetic green lasers. The MAX3600R (Figure 3), MAX3600G (Figure 4), and MAX3600B (Figure 5) are monochrome laser drivers. The laser driver for projectors supports video imaging with red, blue, and green lasers. Each output includes a 10-bit video DAC with programmable gain and offset.
PAGE 11
Laser Driver for Projectors SYNC VCCA VA2 VIDEO BUFFERS D0 D2 VA1 D3 10 os1 gs1 EN1 D6 D7 D8 VIDEO OFFSET GAIN EN OUTPUT1 OUT1 VCCA VA1 MAX3600B D1 +VRED RED LASER D2 10 D4 D5 os3 gs3 EN3 D7 VA4 D8 VIDEO OFFSET GAIN EN OUTPUT3 +3.3V VA2 VA3 D3 D6 D9 OUT3 +VBLUE BLUE LASER D9 CLK CLK VEE_T, VEE REF CS SDA SCL SYNC VIDEO BUFFERS D0 VA4 D1 D5 +3.
PAGE 12
MAX3600 Laser Driver for Projectors Equation 1: Video Input Buffers The synchronous video data inputs (D0 to D9, SYNC, × os  VIDEO GHIGH × gs  OS CLK, and PO) are pseudo-differential. Each input is com-= −I OUT + GLOW  +  HIGH   + OS LOW 3FFh FFh FFh     pared to VREF, as shown in Figure 6. D0 to D9, PO, and SYNC can be left open. SYNC can be connected to REF if not used (for reduced power consumption).
PAGE 13
Laser Driver for Projectors D +VCC IOUT (A) Q VIDEO1 Q VA 0 D VC = VA - VOUT LASER DRIVER OUT VC (V) D Q MAX3600 VIDEO DEMULTIPLEXER VIDEO2 VA - VOUT IOUT Q 0 TIME D D VIDEO3 Figure 9. Output Compliance Voltage Q D DATA TO OUTPUT CHARACTERISTIC IOUT D9:D0 CLK 0 fPIXEL D SYNC Q 1 GAIN OFFSET CLK_SEL CLOCK ON BOTH EDGES (DDR) 0 CLOCK ON RISING EDGE Figure 7.
PAGE 14
Control Logic The control logic provides video selection, laser enable, and power savings. Video Selection The video demultiplexer creates signals VIDEO1, VIDEO2, and VIDEO3. The VSEL[1/3/4] bits can be used to select the input video for OUTPUT1, OUTPUT3, and OUTPUT4. Laser Control When EN_MAIN is low, all driver outputs are off. This signal works asynchronously (no clock is required to disable outputs).
PAGE 15
Laser Driver for Projectors PO START SUBPIXEL PRBS Oscillator PO STOP 1 . . . . . . . . . m 1 . . . . . . . . . m PO VIDEO2 1 1 PIXEL 1 PIXEL 2 PRBS Generator TIME Figure 13. PO Subpixels PO_M PRBS_N Output 4 can be used to generate random noise. A 32-bit shift register with feedback generates pseudorandom codes. The PRBS_SEL bit selects the PRBS clock source. Serial Port and Registers Table 4.
PAGE 16
MAX3600 Laser Driver for Projectors WRITE MODE CS tT tL tCH SCL 0 1 2 SDA A6 3 4 5 6 7 A3 A2 A1 A0 R/W 8 9 10 11 12 13 14 D7 D6 D5 D4 D3 D2 D1 15 tDS tCL A5 A4 tDH D0 MSB LSB READ MODE CS tL tT tCH SCL 0 1 2 SDA A6 3 4 5 6 7 8 9 tDS tCL A5 A4 10 11 12 13 14 15 tD A3 A2 A1 R/W A0 D7 D6 D5 D4 D3 D2 D1 D0 tDH Figure 14. Serial Port Timing Diagram Table 6.
PAGE 17
Laser Driver for Projectors BIT NAME DEFAULT 7:5 X 0 Unused. 4 VSEL1 0 Video select for OUTPUT1. 0 = VIDEO1, 1 = VIDEO2. 3 VSEL3 0 Video select for OUTPUT3. 0 = VIDEO3, 1 = VIDEO2. 2 VSEL4 0 Video select for OUTPUT4. 0 = PRBS, 1 = VIDEO2. 1 PRBS_SEL 0 PRBS clock source select. 1 = fPRBS1, 0 = fPIXEL. 0 CLK_SEL 1 Pixel clock source select. 0 = CLK pin, 1 = SYNC pin. MAX3600 Table 7. cnfig Register Bit Description DESCRIPTION Table 8.
PAGE 18
Laser Driver for Projectors MAX3600 Power-On-Reset POWER-ON RESET VCCA VPOR1 VA1 AND POR1 AND POR2 VPOR2 VA2 The power-on reset monitors the supply voltages of the circuit (Figure 15). It is recommended that VCC be applied to the IC before VA1 to VA4 are applied as shown in Figure 16. On power-down, it is recommended that VA1 to VA4 are powered down before VCC. Failure to follow the sequencing recommendation can result in device stress, but has not been observed to cause immediate damage.
PAGE 19
Laser Driver for Projectors It is best to solder the laser to the PCB. If a connector is required, minimize inductance. Inductance > 10nH at OUT2 could cause large ringing. When routing OUTPUT1 and OUTPUT2, route connections to the VA_ pins on the top layer, and connect the OUT_ pins to the laser through vias. Laser Driver Thermal Considerations The circuit is designed to meet specifications with an operating junction temperature (TJ) up to +125NC.
PAGE 20
Laser Driver for Projectors MAX3600 Typical Operating Circuits ENABLE (3.3V CMOS) VIDEO CLOCK (3.3V CMOS) VIDEO SYNC (CMOS) VIDEO (CMOS) GREEN OFF* (CMOS) EN_MAIN CLK SYNC D0–D9 PO LASER DRIVER 10 MAX3600 MAX3600A +1.8V TO +3.3V VDDQ +VRED VA1 CA1 RED LASER OUT1 CC1 RC1 +VNOISE +VGREEN VA4 VA2 CC2 CA2 RC2 CA3 RD2 REF VIDEO PROCESSOR OUT2 OUT4 GREEN LASER +VBLUE VA3 VIDEO MARKER* (3.3V CMOS) CHIP SELECT (3.3V CMOS) SERIAL DATA (3.3V CMOS) SERIAL CLOCK (3.
PAGE 21
Laser Driver for Projectors +VDDQ 10 D0–D9 VDDQ/2 CHIP-SELECT RED (3.3V CMOS) VIDEO MARKER RED (3.3V CMOS) 10 CLOCK GREEN (CMOS) MAX3600R D0–D9 CHIP-SELECT GREEN (3.3V CMOS) GREEN OFF (3.3V CMOS) VIDEO MARKER GREEN (3.3V CMOS) 10 RPO VEE_T, VEE EP CLOCK BLUE (CMOS) CHIP-SELECT BLUE (3.3V CMOS) VIDEO MARKER BLUE (3.
PAGE 22
tSU tH CLK V V V 20 EN_MAIN VEE 32 19 SCL VM 33 18 CS VA1 37 VCCD 38 16 VEE 15 VA3 14 OUT3 13 RES *EP + REF 39 12 CLK 11 SYNC 4 5 6 D5 3 D4 2 D3 1 D2 PO 40 D1 Figure 22. Configuration 2: Video Data Format 17 SDA MAX3600 MAX3600A MAX3600R MAX3600G MAX3600B VA1 35 OUT1 36 V = VIDEO DATA. VEE_T 30 29 28 27 26 25 24 23 22 21 N.C.
PAGE 23
Laser Driver for Projectors REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 7/09 Initial release — 1 10/09 Corrected errors for SCL in Figure 14 16 8/10 Removed future status from the MAX3600A in the Ordering Information table; added the soldering temperature to the Absolute Maximum Ratings section; in the Electrical Characteristics table updated the analog supply voltage and analog supply current values, added compliance voltage, updated maximum offset values, and added propagation d