19-1420; Rev 1; 6/00
MAX3867 Evaluation Kit
General Description
The MAX3867 evaluation kit (EV kit) is an assembled
demonstration board that provides optical or electrical
evaluation of the MAX3867.
The EV kit is composed of two independent sections on
the PC board. The output of the electrical evaluation
section is interfaced to an SMA connector, which can
be connected to a 50Ω terminated oscilloscope. The
output of the optical evaluation section is configured for
attachment to a laser/monitor diode.
o
Fully Assembled and Tested
o
+3.3V to +5.0V Operation
o
Input Termination Provided On-Board
Features
Evaluates: MAX3867
Ordering Information
PART
MAX3867EVKIT
TEMP. RANGE
-40°C to +85°C
IC PACKAGE
48 TQFP
Electrical Component List
DESIGNATION QTY
C14, C21, C31,
C33, C44
C24, C25, C28,
C32
C26, C27, C29,
C30, C34
C37, C39
C40
C41, C45
C42
C43
D3
5
4
5
2
1
2
1
1
1
DESCRIPTION
Do not install.
0.01µF ±10% ceramic capacitors
(0402)
0.1µF ±10% ceramic capacitors (0603)
0.056µF ±10% ceramic capacitors
(0603)
10µF ±20% tantalum (16V) capacitor
AVX TAJC106M016
0.01µF ±10% ceramic capacitors
(0603)
0.22µF ±10% ceramic capacitor (0603)
1000pF ±10% ceramic capacitor (0402)
LED
Digi-Key P363-ND
SMA edge-mount connectors
EFJohnson 142-0701-801 or
Digi-Key J502-ND
Shunts
Digi-Key S9000-ND
2-pin headers (0.1in center)
Digi-Key S1012-36-ND
1kΩ ferrite beads (0805)
Murata BLM21A102S
1.2µH inductor
Coilcraft 1008LS-122XKBC
600Ω ferrite beads (0603)
Murata BLM11A601SPT
R41
R42
R43, R45
R44
R46
U2
U3
TP2, TP3, TP8,
TP10–TP13,
VCC1, GND1
TP17, TP18
None
None
1
1
2
1
1
1
1
9
2
1
1
DESIGNATION QTY
Q2
R5, R22, R47
R23
R25, R26, R30,
R31
R28, R29, R32,
R33
R34
R37
R38, R49
R40
1
3
1
4
4
1
1
2
1
DESCRIPTION
PNP transistor (SOT23)
Zetex FMMT591A (“91A” marking)
1.5kΩ ±1% resistors (0603)
1kΩ ±1% resistor (0603)
84.5Ω ±1% resistors (0402)
124Ω ±1% resistors (0402)
110Ω ±1% resistor (0603)
Do not install.
49.9Ω ±1% resistors (0402)
100kΩ variable resistor
Bournes or Digi-Key 3296W-104-ND
50kΩ variable resistor
Bournes or Digi-Key 3296W-503-ND
200kΩ variable resistor
Bournes or Digi-Key 3296W-204-ND
0Ω resistors (0603)
24.9Ω ±1% resistor (0402)
15Ω ±1% resistor (0603)
MAX3867ECM (48-pin TQFP)
MAX495ESA
Test points
Digi-Key 5000K-ND
Do not install.
MAX3867 data sheet
MAX3867 EV kit circuit board (Rev D)
J5–J9
5
JU4, JU5
JU4, JU5
L7, L13
L9
L10, L11
2
2
2
1
2
________________________________________________________________
Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3867 Evaluation Kit
Evaluates: MAX3867
Optical Component List
DESIGNATION QTY
C1–C4, C17,
C38
C5, C8, C9,
C15, C18, C35
C6
C7
C10–C13, C23
C16
C19
C20, C22, C36
D1
6
6
1
1
5
1
1
3
1
DESCRIPTION
0.01µF ±10% ceramic capacitors
(0402)
Do not install.
1000pF ±10% ceramic capacitor
(0402)
0.056µF ±10% ceramic capacitor
(0603)
0.1µF ±10% ceramic capacitors (0603)
0.22µF ±10% ceramic capacitor (0805)
10µF ±20% tantalum (16V) capacitor
AVX TAJC106M016
0.01µF ±10% ceramic capacitors
(0603)
LED
Digi-Key P363-ND
SMA edge-mount connectors
EFJohnson 142-0701-801 or
Digi-Key J502-ND
2-pin headers (0.1in center)
Digi-Key S1012-36-ND
Shunts
Digi-Key S9000-ND
1kΩ ferrite bead (0805)
Murata BLM21A102S
600Ω ferrite bead (0603)
Murata BLM11HA601SPT
0Ω resistor (0603)
DESIGNATION QTY
L4
L5, L6
R1, R2
R3
R6, R7, R10,
R11
R8, R9, R12,
R13
R14
R15
R16
R18
R19
R20
R21
R27
R35, R48
R36
TP1, TP4, TP5,
TP6, TP14,
VCC, GND
TP15, TP16
U1
1
2
2
1
4
4
1
1
1
1
1
1
1
1
2
1
7
2
1
DESCRIPTION
1.2µH Inductor
Coilcraft 1008LS-122XKBC
600Ω ferrite beads (0603)
Murata BLM11A601SPT
1.5kΩ ±1% resistors (0603)
1.0kΩ ±1% resistor (0603)
84.5Ω ±1% resistors (0402)
124Ω ±1% resistors (0402)
50kΩ variable resistor
Bournes or Digi-Key 3296W-503-ND
200kΩ variable resistor
Bournes or Digi-Key 3296W-204-ND
100kΩ variable resistor
Bournes or Digi-Key 3296W-104-ND
110Ω ±1% resistor (0603)
Do not install.
27.4Ω ±1% resistor (0402)
49.9Ω ±1% resistor (0402)
24.9Ω ±1% resistor (0402)
0Ω resistors (0603)
43.2Ω ±1% resistor (0402)
Test points
Digi-Key 5000K-ND
Do not install.
MAX3867ECM (48-pin TQFP)
J1–J4
4
JU1, JU2
JU1, JU2
L1
L2
L3
2
2
1
1
1
Component Suppliers
SUPPLIER
AVX
Coilcraft
Digi-Key
EFJohnson
Murata
Zetex
PHONE
803-946-0690
847-639-6400
218-681-6674
402-474-4800
814-237-1431
516-543-7100
FAX
803-626-3123
847-639-1469
218-681-3380
402-474-4858
814-238-0490
516-864-7630
Quick Start
Electrical Evaluation
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
(MD) current is provided by Q2, which is controlled by
an operational amplifier (U3). The APC test circuit, con-
sisting of U3 and Q2, applies the simulated MD current
(the laser bias current divided by 100) to the MD pin of
the MAX3867. To ensure proper operation in the electri-
cal configuration, set up the evaluation board as fol-
lows:
1) If data is to be latched, remove the shunt from JU4
to enable the input clock; otherwise, leave the shunt
in place.
2
_______________________________________________________________________________________
MAX3867 Evaluation Kit
2) Remove the shunt from JU5 to enable the outputs.
Note:
When performing the following resistance checks,
manually set the ohmmeter to a high range to avoid for-
ward biasing the on-chip ESD protection diodes.
3) Adjust R41, the MOD potentiometer, for 10kΩ resis-
tance between pins 1 and 3 (test point 3 and
ground).
4) Adjust R42, the BIAS potentiometer, for 10kΩ resis-
tance between pins 1 and 3 (test point 2 and
ground).
5) Adjust R40, the APC potentiometer, for 10kΩ resis-
tance between pins 1 and 3 (test point 8 and ground).
6) Apply a differential input signal (max amplitude
≤800mV
per side) to J7 and J8 (DATA+ and DATA-).
7) If the latch is enabled, apply a differential clock sig-
nal (max amplitude
≤
800mV per side) to J5 and J6
(CLK+ and CLK-).
8) Attach a high-speed oscilloscope with 50Ω inputs
to J9.
9) Power up the board with a +3.3V supply.
10) Adjust R42 until the desired laser bias current is
achieved:
I
BIAS
=
V
TP13
- V
TP12
15Ω
•
cutout portion on the top (component) side of
the PC board. Solder the laser diode cathode to
the center pad, and solder the anode to either
of the other two pads (they are both connected
to V
CC
).
Connect the monitor photodiode to two of the
five pads on the bottom (solder) side of the PC
board, directly below the laser diode pads.
Three of these pads (the middle and outside
positions) are initially not connected. The other
two pads are connected to V
CC
. Solder the
anode and cathode of the monitor photodiode
to any two of the three pads that are not con-
nected. Then connect the anode to the MD pin
by shorting the corresponding solder jumper
(Figure 1). Connect the cathode to V
CC
by using
solder to bridge to an adjacent V
CC
pad.
Evaluates: MAX3867
Note:
When performing resistance checks, manually
set the ohmmeter to a high range to avoid for-
ward biasing the on-chip ESD protection diodes.
4) Adjust R14, the MOD potentiometer, for maximum
resistance between pins 1 and 3 (test point 5 and
ground).
5) Adjust R15, the BIAS potentiometer, for maximum
resistance between pins 1 and 3 (test point 4 and
ground).
6) Adjust R16, the APC potentiometer, for desired opti-
cal power. (Refer to the
Design Procedure
section
of the MAX3867 data sheet.)
7) Apply a differential input signal (≤800mV per side)
to J1 and J2 (DATA+ and DATA-).
8) Apply a differential clock signal (≤800mV per side)
to J3 and J4 (CLK+ and CLK-).
9) Attach the laser diode fiber connector to an opti-
cal/electrical converter.
10) Power up the board with a +3.3V supply.
11) Adjust R15 until the LED (D1) is no longer illuminat-
ed. Optical power can be observed on an oscillo-
scope connected to an optical/electrical converter.
12) Adjust R14 until the desired optical amplitude is
achieved. Optical amplitude can be observed on
an oscilloscope connected to an optical/electrical
converter.
11) Adjust R41 until the desired laser modulation cur-
rent is achieved:
Signal Amplitude (Volts)
I
MOD
=
25Ω
Optical Evaluation
For optical evaluation of the MAX3867, configure the EV
kit as follows:
1) If data is to be latched, remove the shunt from JU1
to enable the input clock; otherwise, leave the shunt
in place.
2) Remove the shunt from JU2 to enable the outputs.
3) The EV kit is designed to allow connection of a vari-
ety of possible laser/monitor diode pin configura-
tions. Connect a TO-header-style laser with MD
(Figure 1) as follows:
•
Keeping its leads as short as possible, connect
the laser diode to two of the three pads in the
_______________________________________________________________________________________
3
MAX3867 Evaluation Kit
Evaluates: MAX3867
Adjustment and Control Descriptions (see Quick Start first)
COMPONENT
OPTICAL
JU1
JU2
—
R14
R15
ELECTRICAL
JU4
JU5
J8
R41
R42
NAME
FUNCTION
Enables/disables the clock input. Shunt for direct data transmission.
Remove shunt to enable clock input.
Enables/disables the output currents. Shunt to disable the part.
Remove shunt for normal operation.
Electrical Output
Adjusts the laser modulation current.
Adjusts the laser bias current. In open-loop mode, R15 or R42 adjusts
the laser bias current. In closed-loop operation, R15 or R42 adjusts the
maximum laser bias current.
For closed-loop operation, R16 or R40 adjusts the MD current level.
TTL low level indicates a failure in the APC loop.
Refer to the
Design
section of the MAX3867 data sheet. Set APC cur-
rent, then increase bias current until LED goes off (LED is illuminated
when the APC loop is open, and off when the APC loop is closed).
CLOCK DISABLE
OUTPUT DISABLE
Electrical Output SMA
MOD
BIAS
R16
TP1
D1
R40
TP10
D3
APC
Fail Indicator
Fail Indicator
4
_______________________________________________________________________________________
MAX3867 Evaluation Kit
Evaluates: MAX3867
CONFIGURATION 1
CONFIGURATION 2
TOP OF PC BOARD
V
CC
R20
V
CC
TOP OF PC BOARD
V
CC
R20
V
CC
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
PD
PD
SOLDER
BRIDGES
V
CC
V
CC
SOLDER
BRIDGES
TO MD
V
CC
V
CC
TO MD
BOTTOM OF
PC BOARD
BOTTOM OF
PC BOARD
CONFIGURATION 3
CONFIGURATION 4
TOP OF PC BOARD
V
CC
R20
V
CC
TOP OF PC BOARD
V
CC
R20
V
CC
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
LD
TO-46 CAN
LASER/PHOTODIODE
PAIR
PD
PD
SOLDER
BRIDGES
V
CC
V
CC
SOLDER
BRIDGES
TO MD
V
CC
V
CC
TO MD
BOTTOM OF
PC BOARD
BOTTOM OF
PC BOARD
Figure 1. Attachment of Laser Diode/Monitor Diode to MAX3867 EV Kit
_______________________________________________________________________________________
5
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