MAXIM MAX3667 Technical data

_________________________Quick Start

1) Ensure that solder bridges SJ1, SJ2, and SJ4 are
shorted.

2) Ensure that solder bridge SJ5 is open.

3) Install shunt JU3 between pins 1 and 2.

4) Install shunt JU1 between pins 2 and 3.

5) Open JU10.

6) Turn the R13 (APCSET) potentiometer counter­clockwise to 50kΩ (maximum turn).

________________General Description

The MAX3667 evaluation kit (EV kit) is an assembled,
surface-mount demonstration board that provides easy
optical evaluation of the MAX3667.

____________________________Features

♦ Fully Assembled and Tested
♦ Board is Configured for 3.3V Operation
♦ PECL Input Termination Provided On-Board
♦ Independent Electrical Monitoring of Modulation

and Bias Currents

Evaluates: MAX3667

MAX3667 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

1

QTY DESCRIPTION

C1, C2, C4,

C5, C7–C10,

C12, C13,
C15, C16,

C17, C19

14

C3 1

C6, C14 2

1µF ±10%, 25V min ceramic
capacitors

C11 1

C18, C20 2

100µF ±10%, 16V tantalum capacitors
Digi-Key P5231-ND or
Panasonic ECE-A1CGE101

R1, R2 2

R3, R5, R13 3

R4, R6 2

R7, R20 2 100Ω ±1% resistors

R8, R9 2 82.5Ω ±1% resistors

R11 1 4.75Ω ±1% resistor
R12 1 20kΩ ±5% resistor

0.01µF ±10%, 25V min ceramic
capacitor

1000pF ±10%, 25V min ceramic
capacitor

0.1µF ±10%, 25V min ceramic
capacitors

SUPPLIER PHONE FAX

AVX

[phone]
[phone]

[phone]

______________Component Suppliers

_______________________________________________________________________Component List

DESIGNATION

130Ω ±1% resistors
50kΩ Bournes variable resistors

Digi-Key 3296W-503-ND

1.5kΩ ±5% resistors

Central
Semiconductor

[phone] [phone]

Murata

[phone]
[phone]

[phone]

Zetex [phone] [phone]

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone].
For small orders, phone [phone] ext. 3468.

DESIGNATION QTY DESCRIPTION

R17, R18 2 49.9Ω ±1% resistors

R19 1 232Ω ±1% resistor
R21 1 22.1Ω ±1% resistor

SJ1, SJ2, SJ4 3

Trace gap jumpers. Short with solder.

SJ5 1

Trace gap jumper. Leave open.

L1 1

470nH inductor
Coilcraft 1008CS-471XKBC

J1–J4 4

SMA connectors (edge mount)
E.F. Johnson 142-0701-801
Digi-Key J502-ND

JU1, JU3 2

3-pin headers (0.1" centers)
Digi-Key S1012-36-ND

JU10 1

2-pin header (0.1" center)
Digi-Key S1012-36-ND

VCC, GND 2

1-pin headers
Mouser test point 151-203

JU1, JU3,

JU10

3

Shunts
Digi-Key S9000-ND

U1 1 MAX3667ECJ (32-pin TQFP)
None 1 MAX3667 circuit board
None 1 MAX3667 data sheet

R15 1 2kΩ ±5% resistor

19-1311; Rev 1; 3/98

PART

MAX3667EVKIT -40°C to +85°C

TEMP. RANGE IC PACKAGE

32 TQFP

_______________Ordering Information

Evaluates: MAX3667

7) Turn the R3 (MODSET) potentiometer counter­clockwise to 50kΩ (maximum turn).

8) Attach a high-impedance voltmeter to J3 (BIAS­MON).

9) Attach a high-impedance oscilloscope to J4 (MOD­MON).

10) Apply a PECL-compatible differential input signal
across J1 to J2.

11) Connect a TO46-style header laser diode and mon­itor (Figure 1).

12) Attach the laser diode output to an optical/electrical
converter.

13) Power the board up with a +3.3V power source at
the 3.3V pin and GND pin. Set the current limit to
300mA.

14) Adjust APCSET (R13) clockwise until the desired
laser bias is achieved. Bias can be monitored at J3
(BIASMON). The conversion factor is (V

BIASMON

/

50) x 38 (typical) = I

BIAS

. Power can also be moni­tored at the laser diode with an optical/electrical
converter.

15) Adjust MODSET (R3) clockwise until the desired
modulation current is achieved. Modulation can be
monitored at J4 (MODMON). The conversion factor is
(V

MODMON

/ 50) x 33 (typical) = I

MOD

. Modulation
can also be observed on an oscilloscope connected
to an optical/electrical converter.

MAX3667 Evaluation Kit

2 _______________________________________________________________________________________

COMPONENT NAME FUNCTION

R5 BIASSET

In open-loop operation (APC not used) this potentiometer adjusts the bias current
applied to the laser. Note that R6 limits the maximum bias current.

R13 APCSET

In closed-loop operation (APC engaged) this potentiometer adjusts the bias current
applied to the laser. Note that R15 limits the maximum bias current.

R3 MODSET

This potentiometer adjusts the modulation current applied to the laser. Note that R4
limits the maximum modulation current.

JU1 DISABLE

Shunting between pins 1 and 2 (high) disables the part. Shunting pins 2 and 3
enables the part.

JU3 APC

In closed-loop operation (APC engaged) pins 1 and 2 must be shunted. In open-loop
operation pins 2 and 3 must be shunted.

JU10 — Open when in closed-loop mode. Shunted when in open-loop mode.

J3 BIASMON

Monitors the bias current at the laser. BIASMON is typically 1/38 of the actual laser
bias current. When SJ1 is closed and using a high-impedance meter, current at
BIASMON = V

BIASMON

/ 49.9Ω.

J4 MODMON

Monitors the modulation current at the laser. If using a high-impedance scope,
ensure that SJ2 is closed. I

MODMON

= (voltage on oscilloscope) / 49.9Ω. I

MODMON

is

typically 1/33 of the actual laser modulation current (I

QMOD

). If using a 50Ω terminat-

ed scope, ensure that SJ2 is open. Conversion factor is the same as above.
SJ1 50Ω termination See BIASMON (J3).
SJ2 50Ω termination See MODMON (J4).

SJ4 —

When using APC, this solder jumper should be shorted. When APC is not being

used, ensure that the solder jumper is open.

SJ5 —

When using APC, this solder jumper should be open. When APC is not being used,

ensure that the solder jumper is shorted.

_______________Adjustment and Control Descriptions (

see

Quick Start

first

)

Evaluates: MAX3667

MAX3667 Evaluation Kit

_______________________________________________________________________________________ 3

FOUR SOLDER WIRE CONTACTS:
2 TOP (LASER) AND
2 BOTTOM (MONITOR)

SMA CONNECTORS

VIEW FROM TOP

V

CC

LASER ANODE
CONNECTION

MONITOR CATHODE
CONNECTION

LASER DIODE/MONITOR ASSEMBLY

VIEW FROM BOTTOM

OPTICAL FIBER

V

CC

Figure 1. Attachment of Laser Diode/Monitor to MAX3667 EV Kit