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19-1594 Rev 0; 12/99
MAX3669 Evaluation Kit
General Description
The MAX3669 evaluation kit (EV kit) is an assembled
demonstration board that provides easy optical or elec-
trical evaluation of the MAX3669, a 622Mbps laser dri-
ver with current monitors and automatic power control
(APC) circuitry. Although the MAX3669 EV kit is
shipped in the electrical configuration, this EV kit also
provides configuration instructions for optical operation.
o
Fully Assembled and Tested
o
+3.3V or +5V Operation
o
On-Board Input Termination
o
Independent Electrical Monitoring of Modulation
and Bias Currents
Features
Evaluates: MAX3669
Component Suppliers
SUPPLIER
AVX
Coilcraft
Murata
Zetex
PHONE
803-946-0690
847-639-6400
814-237-1431
516-543-7100
FAX
803-626-3123
847-639-1469
814-238-0490
516-864-7630
PART
MAX3669EVKIT
Ordering Information
TEMP. RANGE
-40°C to +85°C
IC PACKAGE
32 TQFP
Note:
Please indicate that you are using the MAX3669 when
contacting these component suppliers.
Component List for Electrical Configuration
DESIGNATION
C1, C12
C2, C3, C6, C20
C4, C7, C10, C11
C8
C16
C19
C21
D1
J1, J2, J5
L3
P1
None
Q1
R1, R2, R3, R24
R5
R6, R7, R21
R8, R9
R10, R11
R12
R13, R22, R25
R14
R15
R16
QTY
2
4
4
1
1
1
1
1
3
1
1
1
1
4
1
3
2
2
1
3
1
1
1
DESCRIPTION
0.01µF ±10% ceramic caps (0402)
0.01µF ±10% ceramic caps (0603)
1µF ceramic capacitors (0805)
100pF ±10% ceramic cap (0402)
0.1µF ±10% ceramic capacitor (0805)
10µF ±10%, 10V min tantalum cap
AVX TAJC106K016
5pF ±5% ceramic capacitor (0402)
LED
SMA connectors (edge mount)
1.2µH inductor
Coilcraft 1008LS-122XKBC
2-pin header (0.1in centers)
Shunt for P1
PNP transistor
Zetex FMMT591A
1.5kΩ ±5% resistors (0603)
12.4Ω ±1% resistor (0402)
84.5Ω ±1% resistors (0603)
124Ω ±1% resistors (0603)
20Ω ±1% resistors (0603)
10Ω ±1% resistor (0402)
0Ω resistors (0603)
50kΩ variable resistor
200kΩ variable resistor
100kΩ variable resistor
DESIGNATION
R18
R20
R23
R26, R28
U1
U3
VCC, GND, TP1,
TP4, TP5, TP6,
TP8–TP11
None
None
QTY
1
1
1
2
1
1
10
1
1
DESCRIPTION
110Ω ±5% resistor (0603)
0Ω resistor (0402)
15Ω ±5% resistor (0603)
392Ω ±1% resistors (0603)
MAX3669EHJ 32-pin TQFP
MAX495ESA 8-pin SOIC
Test points
MAX3669 data sheet
MAX3669 EV kit PC board
(Rev. A)
Component Modifications
for Optical Configuration
DESIGNATION QTY
J5
L2
R5
R13
R19
R20
R22
R23
U2
1
1
1
1
1
1
1
1
1
Remove
3.3µH inductor
Coilcraft 1008CS-332XKBC
Remove
Remove
20Ω ±5% resistor (0402)
5Ω ±5% resistor (0402)
Remove
Remove
User-supplied laser diode
1
DESCRIPTION
________________________________________________________________
Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3669 Evaluation Kit
Evaluates: MAX3669
Quick Start
Electrical Setup (Default)
In the electrical configuration, an automatic power con-
trol (APC) test circuit is included to emulate a semicon-
ductor laser with a monitor photodiode. Monitor diode
current is provided by Q1, which is controlled by an
operational amplifier (U3). The APC test circuit, consist-
ing of U3 and Q1, applies the simulated monitor diode
current to the MAX3669’s MD pin. The ratio of I
BIAS
/
I
MD
is R24 / R23 = 100. To ensure proper operation in
the electrical configuration, set up the evaluation board
as follows:
1) Verify inductor L2 is not installed.
2) Remove the shunt from P1 to enable the output.
Note:
When performing the following resistance
checks, manually set the ohmmeter to a high range to
avoid forward biasing the on-chip ESD protection
diodes.
3) Adjust R14, the MOD (R
MODSET
) potentiometer, for
10kΩ resistance between pins 2 and 3 (test point 5
and ground).
4) Adjust R15, the BIAS (R
BIASMAX
) potentiometer, for
10kΩ resistance between pins 2 and 3 (test point 4
and ground).
5) Adjust R16, the APC (R
APCSET
) potentiometer, for
10kΩ resistance between pins 2 and 3 (test point 6
and ground).
6) Power up the board with a +3.3V supply.
7) Apply a differential input signal (max amplitude
≤800mV
per side) to J1 and J2 (DATA+ and DATA-).
8) Attach a high-speed oscilloscope with 50Ω inputs
to J5.
9) Adjust R
BIASMAX
(R15) and R
APCSET
(R16) until the
desired laser-bias current is achieved (refer to the
note in the
Applications Information
section of the
MAX3669 data sheet).
10) Adjust R
MODSET
(R14) until the desired laser-modu-
lation current is achieved.
Note:
See
Adjustment and Control Descriptions.
Optical Setup
For optical operation, the electrical APC test circuit
must be disabled. For optical evaluation of the MAX3669,
configure the EV kit as described in
Component
Modifications for Optical Configuration:
1) Remove the shunt from P1 to enable the output.
2) Connect a TO-style header laser and monitor diode
(Figure 1) as follows:
• Keeping the leads to the laser diode as short as
possible, connect the laser diode on the compo-
nent side of the board between R20 and V
CC
with the cathode connected to R20 and the
anode connected to V
CC
.
• Connect the monitor diode on the underside of the
the board with the anode connected to the
MAX3669’s MD pin and the cathode connected to
V
CC
.
Note:
When performing resistance checks, manually
set the ohmmeter to a high range to avoid forward bias-
ing the on-chip ESD protection diodes.
3) Adjust R14, the MOD (R
MODSET
) potentiometer, for
maximum resistance between pins 2 and 3 (test
point 5 and ground).
4) Adjust R15, the BIAS (R
BIASMAX
) potentiometer, for
maximum resistance between pins 2 and 3 (test
point 4 and ground).
5) Adjust R16, the APC (R
APCSET
) potentiometer, for
desired optical power. (Refer to the
Design
Procedure
section of the MAX3669 data sheet.)
6) Power up the board with a +3.3V supply.
7) Apply a differential input signal (≤800mV per side)
to J1 and J2 (DATA+ and DATA-).
8) Attach the laser-diode output to an optical/electrical
converter.
9) Adjust R15 until LED D1 is no longer illuminated.
Laser power can be monitored at the laser diode
with an optical/electrical converter (refer to the note
in the
Applications Information
section of the
MAX3669 data sheet).
10) Adjust R14 until the desired optical amplitude is
achieved. Optical amplitude can be observed on an
oscilloscope connected to an optical/electrical con-
verter.
2
_______________________________________________________________________________________
MAX3669 Evaluation Kit
Evaluates: MAX3669
CONFIGURATION 1
CONFIGURATION 2
TOP OF PC BOARD
TOP OF PC BOARD
V
CC
V
CC
L2
V
CC
V
CC
L2
SOLDER
BRIDGES
TO-46 CAN
LASER/PHOTODIODE
PAIR
BOTTOM OF PC BOARD
SOLDER
BRIDGES
D3
D3
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
PD
BOTTOM OF PC BOARD
PD
BOTTOM OF PC BOARD
V
CC
V
CC
SOLDER
BRIDGES
V
CC
V
CC
L2
D3
LD
PD
V
CC
V
CC
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD
TOP OF PC BOARD
L2
V
CC
V
CC
V
CC
V
CC
TO-46 CAN
LASER/PHOTODIODE
PAIR
BOTTOM OF PC BOARD
SOLDER
BRIDGES
D3
LD
PD
V
CC
V
CC
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3669 EV Kit
_______________________________________________________________________________________
3
Evaluates: MAX3669
R16
100k R
APCSET
TP3
CW
TP5
R3
1.5k
C15
C9
R4
R2
1.5k
R1
1.5k
C16
0.1µF
MD
31 30
N.C.
N.C.
GND
N.C.
CAPC
VCC
24
23
22
21
20
VCC
19
18
17
VCC
R10
20Ω
C7
1µF
R19
R11
20Ω
VCC
C8
100pF
R12
10Ω
C4
1µF
R20
0Ω
MODSET
APCSET
C1
0.01µF
29 28
27
26
25
32
BIASMAX
TP4
R14
50k R
MODSET
CW
R15
200k R
BIASMAX
CW
TP6
TP7
MAX3669 Evaluation Kit
GND
FAIL
N.C.
N.C.
GND
V
CC
ENABLE
BIAS
R21
84.5Ω
R29
P1
P3
VCC
C19
10µF
C20
0.01µF
TP1
VCC
TP10
D1
RED
TP9
R18
110Ω
C6
0.01µF
BIAS
R22
0Ω
C12
0.01µF
R25
0Ω
C18
C5
P4
L2
VCC
P5
GND
L3
1.2µH
VCC
R24
1.5k
VCC
Figure 2. MAX3669 EV Kit Schematic—Electrical Configuration
C2
0.01µF
1
V
CC
V
CC
V
CC
VCC
3
DATA+
DATA-
GND
V
CC
BIASMON
OUT+
V
CC
VCC
C21
5pF
BIAS
J5
OUT
MODMON
OUT-
V
CC
GND
4
2
MD
4
U1
MAX3669
GND
5
VCC
C3
0.01µF
7
8
TP8
VCC
9
10
11
12
13
14
15
16
R27
VCC
R26
392Ω
TP11
R28
392Ω
6
R7
84.5Ω
R5
12.4Ω
4
5
U3
R17
VCC
J1
C10
1µF
R6
84.5Ω
DATA+
R8
124Ω
J2
C11
1µF
DATA-
R9
124Ω
_______________________________________________________________________________________
2
3
R23
15Ω
Q1
FMMT591A
MAX495
VCC
7
R13
0Ω
MD
VCC
R17
TP6
TP3
TP5
R3
1.5k
C15
C9
R4
R2
1.5k
MD
C16
0.1µF
31 30
N.C.
N.C.
GND
N.C.
CAPC
MODSET
APCSET
VCC
24
23
22
21
20
VCC
19
18
17
VCC
R10
20Ω
C7
1µF
R11
20Ω
VCC
C8
100pF
R12
10Ω
C4
1µF
R20
5Ω
C1
0.01µF
29 28
27
26
25
V
CC
R1
1.5k
C2
0.01µF
1
V
CC
V
CC
V
CC
VCC
3
DATA+
DATA-
GND
V
CC
BIASMON
OUT+
V
CC
FAIL
N.C.
N.C.
GND
V
CC
BIAS
VCC
C21
5pF
BIAS
MODMON
ENABLE
GND
OUT-
V
CC
GND
4
2
MD
BIASMAX
32
R
MODSET
CW
R15
TP4
CW
200k R
BIASMAX
R16
100k R
APCSET
CW
R14
50k
TP7
VCC
J1
C10
1µF
R6
84.5Ω
*
DATA+
U1
MAX3669
GND
R8
124Ω
5
VCC
C3
0.01µF
7
8
TP8
VCC
9
10
11
12
13
14
15
16
R27
VCC
VCC
R26
392Ω
TP11
R28
392Ω
6
Figure 3. MAX3669 EV Kit Schematic—Optical Configuration
R7
84.5Ω
R19
20Ω
R29
P1
P3
VCC
C19
10µF
VCC
TP10
R5
D1
RED
4
5
U3
J2
C11
1µF
DATA-
R9
124Ω
R21
84.5Ω
C5
C18
VCC
C12
0.01µF
C20
0.01µF
R25
0Ω
TP1
P4
L2
3.3µH
GND
P5
L3
1.2µH
VCC
R24
1.5k
R23
2
3
TP9
R18
110Ω
R22
Q1
FMMT591A
MAX495
VCC
C6
0.01µF
BIAS
7
* TO PHOTOLASER (SEE FIGURE 1 FOR
PHOTOLASER CONNECTION).
R13
Evaluates: MAX3669
_______________________________________________________________________________________
VCC
MD
MAX3669 Evaluation Kit
5

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