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19-1451; Rev 0; 3/99
MAX3866 Evaluation Kit
General Description
The MAX3866 evaluation kit (EV kit) is a fully assem-
bled, chip-on-board (COB) electrical demonstration kit.
It provides easy evaluation of the MAX3866 2.5Gbps,
+3.3V combined transimpedance/limiting amplifier.
Features
o
Easy +3.3V or +5.0V Electrical Evaluation of
MAX3866
o
Evaluation of Adjustable Loss-of-Power (LOP)
o
Fully Assembled and Tested
o
EV Kit Designed for 50Ω I/O Interface
Evaluates: MAX3866
Component List
DESIGNATION QTY
C1, C2, C3,
C5–C8
C9, J2, J3, L2,
R4, R10, R11,
R12, TP2, TP3
L1
R1
R2
R3, R7
R5, R8
R6
R9
CR1
INPUT (J1),
OUT+ (J4),
OUT- (J5)
LOP
VCCS, VCCD,
GND
VCCS
U1
None
None
None
None
None
7
DESCRIPTION
100nF, 25V min, 10% ceramic capaci-
tors (0603)
Leave site open
1µH inductor
Coilcraft 1008CS-102 XKBB, 10%
500Ω potentiometer
150Ω, 1% resistor (0402)
1kΩ, 1% resistors (0402)
49.9Ω, 1% resistors (0402)
1kΩ potentiometer
1MΩ potentiometer
LED
SMA connectors (edge mount)
E.F. Johnson 142-0701-801 or
Digi-Key J502-ND
Test point
Mouser 151-203
2-pin headers (0.1" centers)
Digi-Key S1012-36-ND
Shunt (installed)
Digi-Key S9000-ND
MAX3866E/D
MAX3866 circuit boards, Rev. B
MAX3866 data sheet
MAX3866 EV kit data sheet
0.5" spacers
Screws for the spacers
Ordering Information
PART
MAX3866EVKIT
TEMP. RANGE
-40°C to +85°C
0
1
1
1
2
2
1
1
1
3
Component Suppliers
SUPPLIER
AVX
Central Semiconductor
Murata
Zetex
PHONE
803-946-0690
516-435-1110
814-237-1431
516-543-7100
FAX
803-626-3123
516-435-1824
814-238-0490
516-864-7630
Note:
Please indicate that you are using the MAX3866 when
ordering from these suppliers.
Electrical Quick Start
1) Attach matched 50Ω SMA cables from a 50Ω oscillo-
scope to OUT+ and OUT-. Set the oscilloscope to
20mV/div and 200ps/div. A single-ended evaluation
is acceptable; however, the cable not terminated
into the scope should be terminated with a 50Ω load
at the end of the cable.
2) Ensure that there is a shunt across the VCCS pins.
(Remove shunt for 5.0V operation.)
3) Attach ground to either side of the GND 2-pin
header and +3.3V (or +5.0V) to either side of the
VCCD 2-pin header.
4) Connect a 50Ω cable between the output of a 50Ω
source and the input of the EV kit. Set the source to
produce a 2.0Vp-p, 2.5Gbps 1-0 pattern.
5) Adjust R9 and R6 to produce a DC current of 1mA
(1mA = 2.0Vp-p / 1kΩ / 2) through R7. This can be
verified by checking for a 1V drop across R7.
6) Verify that the input pattern is present at the output.
1
1
3
1
1
2
1
1
3
6
________________________________________________________________
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.
MAX3866 Evaluation Kit
Evaluates: MAX3866
Adjustment and Control Description
CONTROL
VCCD
NAME
VCCD
FUNCTION/MANIPULATION
Power-Supply Voltage. Both pins of this dual-pin header are the same
point.
Power-Supply Select Jumper.
Do not apply any external voltages at
this point.
Both pins of this 2-pin header are not connected electrically.
Depending on what the operating voltage is, either place a shunt at
VCCS or remove the shunt from VCCS. When evaluating at 3.14V to
3.47V, ensure that there is a shunt on VCCS. If the evaluation voltage is
5.0V to 5.5V, remove this shunt and place a 100nF capacitor in location
C8. (EV kit is shipped with 100nF in the C8 location; see
Figure 1.)
Single-Ended Input, 3mVp-p to 2.5Vp-p range. This translates into a
current of 3µA to 2.5mA, respectively (voltage at input) / (R3 = 1kΩ).
Note that the EV kit input is terminated for a 50Ω source.
Signal Outputs (AC-coupled). Note that the EV kit outputs are designed
for 50Ω termination.
Sets the LOP Threshold. For normal operation, Maxim recommends R8
+ R1 = 510Ω. However, if other values are desired, please refer to the
Typical Operating Characteristics
section (Assert/Deassert vs. R
PD
) of
the MAX3866 data sheet.
Micro and Macro Current Adjustment. Simulates the average DC
current portion of a diode. The amount of current that should be set
through these potentiometers is calculated by the formula (AC current
into MAX3866) / 2 = DC bias current.
LOP is active high. Therefore, when an LOP condition exists, the LED
will be off.
Solder Jumper. For normal operation, ensure that this solder jumper is
open.
TTL Output, active high. Probe this test point only with a high-imped-
ance lead.
VCCS
VCCS
J1
INPUT
J4, J5
OUTP, OUTM
R1
—
R6, R9
—
CR1
SJ2
TP1
DIODE
—
LOP
2
_______________________________________________________________________________________
ZTEST1
J2
SMA F
Z
O
= 50
1
C9
OPEN
R12
OPEN
VCCS
VCCD
1
2
C7
100nF
C8
100nF
1
L2
OPEN
2
R9
1M
3
2
CHF-
CHF+ VCCS VCCS
LOP
GND
GND
VCCD VCCD
LOP
FIL-
C1
100nF
GND
P2
(C8 IS NOT REQUIRED
IN 3.3V OPERATION.)
2
1
VCCD
P1 (3.13V... 3.47V OR
4.5V....5.5V)
2
R11
OPEN
ZTEST2
J3
SMA
1
F
Figure 1. MAX3866 EV Kit Schematic
1
1
3
2
L1
1µH
R6
1k
R2
150Ω
CR1
DIODE
VCCD
2
R10
OPEN
SJ2
SOLDER JUMPER
OPEN
INPUT
J1
SMA F
1
C3
100nF
R7
1k
U1
GND
OUT+
IN+
R3
1k
GND
C5
100nF
1
OUT+
J4
SMA
2
OUT-
J5
SMA
2
MAX3866
IN-
GND
N.C.
PDC
INV
GND
GND
GND
R5
50Ω
LINE TERMINATION
OUT-
GND
CPD- CPD+
GND
R4
OPEN
C6
100nF
1
2
R8
50Ω
C2
100nF
2
1
R1
500Ω
3
Evaluates: MAX3866
_______________________________________________________________________________________
MAX3866 Evaluation Kit
3
MAX3866 Evaluation Kit
Evaluates: MAX3866
1.0"
Figure 2. MAX3866 EV Kit Component Placement Guide—
Component Side
4
_______________________________________________________________________________________
MAX3866 Evaluation Kit
Evaluates: MAX3866
1.0"
Figure 3. MAX3866 EV Kit PC Board Layout—Component Side
1.0"
Figure 4. MAX3866 EV Kit—Ground Plane
_______________________________________________________________________________________
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