Maxim MAX3866 Quick Start Manual

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.

General Description

The MAX3866 evaluation kit (EV kit) is a fully assem­bled, chip-on-board (COB) electrical demonstration kit.
It provides easy evaluation of the MAX3866 2.5Gbps,
+3.3V combined transimpedance/limiting amplifier.

Features

♦ Easy +3.3V or +5.0V Electrical Evaluation of

MAX3866

♦ Evaluation of Adjustable Loss-of-Power (LOP)
♦ Fully Assembled and Tested
♦ EV Kit Designed for 50Ω I/O Interface

Evaluates: MAX3866

MAX3866 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

1

19-1451; Rev 0; 3/99

SUPPLIER PHONE FAX

AVX 803-946-0690 803-626-3123

Component List

Central Semiconductor 516-435-1110 516-435-1824
Murata 814-237-1431 814-238-0490
Zetex 516-543-7100 516-864-7630

PART

MAX3866EVKIT -40°C to +85°C

TEMP. RANGE

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

Ordering Information

Component Suppliers

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

3

INPUT (J1),

OUT+ (J4),

OUT- (J5)

LED1CR1

1MΩ potentiometer1R9

1kΩ potentiometer1R6

49.9Ω, 1% resistors (0402)2R5, R8

1kΩ, 1% resistors (0402)2R3, R7

DESIGNATION

150Ω, 1% resistor (0402)1R2

500Ω potentiometer1R1

1µH inductor
Coilcraft 1008CS-102 XKBB, 10%

1L1

Leave site open0

C9, J2, J3, L2,

R4, R10, R11,

R12, TP2, TP3

100nF, 25V min, 10% ceramic capaci­tors (0603)

7

C1, C2, C3,

C5–C8

DESCRIPTIONQTY

Test point
Mouser 151-203

1LOP

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

3

VCCS, VCCD,

GND

Shunt (installed)
Digi-Key S9000-ND

1VCCS

MAX3866E/D1U1
MAX3866 circuit boards, Rev. B2None
MAX3866 data sheet1None
MAX3866 EV kit data sheet1None

0.5" spacers3None
Screws for the spacers6None

Note: Please indicate that you are using the MAX3866 when
ordering from these suppliers.

Evaluates: MAX3866

MAX3866 Evaluation Kit

2 _______________________________________________________________________________________

Adjustment and Control Description

CONTROL NAME FUNCTION/MANIPULATION

VCCD VCCD

Power-Supply Voltage. Both pins of this dual-pin header are the same
point.

VCCS VCCS

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

.)

J1 INPUT

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.

J4, J5 OUTP, OUTM

Signal Outputs (AC-coupled). Note that the EV kit outputs are designed
for 50Ω termination.

R6, R9 —

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.

CR1 DIODE

LOP is active high. Therefore, when an LOP condition exists, the LED
will be off.

TP1 LOP

TTL Output, active high. Probe this test point only with a high-imped­ance lead.

R1 —

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. RPD) of

the MAX3866 data sheet.

SJ2 —

Solder Jumper. For normal operation, ensure that this solder jumper is
open.

Evaluates: MAX3866

MAX3866 Evaluation Kit

_______________________________________________________________________________________ 3

CHF-

FIL-

GND

GND

R3

1k

R6

1k

SJ2

SOLDER JUMPER

OPEN

R9

1M

L1

1µH

L2

OPEN

R11

OPEN

R12

OPEN

C9

OPEN

R10

OPEN

Z

O

= 50

2

1

1

1

F

2

2

1

F

F1

2

2

3

GND

GND

3

C3

100nF

R7

1k

INPUT

J1

SMA

ZTEST1

J2

SMA

ZTEST2

J3

SMA

R5

50Ω

LINE TERMINATION

GND

IN+

IN-

GND

N.C.

R8

50Ω

R1

500Ω

C2

100nF

1

3

2

GND

OUT+

OUT-

GND

LOP

CHF+ VCCS VCCS VCCD VCCD

LOP

R2

150Ω

R4

OPEN

CR1

DIODE

VCCD

2

1

GND

P2

VCCD

P1 (3.13V... 3.47V OR

4.5V....5.5V)

2

VCCD

C8

100nF

VCCS

(C8 IS NOT REQUIRED

IN 3.3V OPERATION.)

C7

100nF

C1

100nF

12

1

C5

100nF

OUT+

J4

SMA

OUT-

J5

SMA

1

2

1

2

C6

100nF

PDC INV GND GND CPD- CPD+

MAX3866

U1

Figure 1. MAX3866 EV Kit Schematic