MAX3942EVKIT Datasheet MAX3942EVKIT | P1-P3

__________________________________________________________________Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Evaluates: MAX3942

MAX3942 Evaluation Kit

_________________General Description

The MAX3942 evaluation kit (EV kit) is an assembled

demonstration board that provides electrical evaluation of

the MAX3942 10.7Gbps modulator driver. The outputs are

interfaced to SMA connectors that can be connected to a

50Ω terminated oscilloscope.

_____________________ Component List

DESIGNATION QTY DESCRIPTION

C1 1

22µF ±10% tantalum capacitor

AVX TAJB226K010

C2 1

10µF ±10% tantalum capacitor

AVX TAJA106K010

C3 1

0.1µF ±10% ceramic capacitor

(0402)

C10, C25, C26,

C27, C28, C33

100pF ±5% ceramic capacitors

(0201)

C22, C24, C29,

C31, C42

0.01µF ±10% ceramic capacitors

(0402)

J5, J9 2 SMB connectors, PC mount

J6, J16,

J31−J34

SMA connectors, edge mount,

EF Johnson 142-0701-851

JP1, JP3 2 3-pin headers, 0.1in centers

JP2, JP8,

JP9, JP10

4 2-pin headers, 0.1in centers

L1 1 47nH inductor (0402)

R1, R3 2

2kΩ variable resistors

Bourns 3296W-202

R2 1

1kΩ ±5% resistor (0402)

R4 1

4.02kΩ ±1% resistor (0402)

TP4, TP8, TP9,

TP12, TP13,

TP15, J10, J11

8 Test points

U4 1 MAX3942ETG

None 1

MAX3942 EV kit circuit board,

rev A

None 1 MAX3942 EV kit data sheet

None 1 MAX3942 data sheet

None 7 Shunts

_____________________________Features

♦ SMA Connectors for All High-Speed I/Os

♦ Configured for Electrical Operation, No Laser

Necessary

♦ Single -5.2V Power-Supply Operation

♦ Fully Assembled and Tested

_________________Ordering Information

PART TEMP RANGE IC PACKAGE

MAX3942EVKIT -40°C to +85°C 24 THIN QFN

________________ Component Suppliers

SUPPLIER PHONE FAX

AVX 843-444-2863 843-626-3123

EF Johnson 402-474-4800 402-474-4858

Murata 415-964-6321 415-964-8165

Note: Please indicate that you are using the MAX3942 when

ordering from these suppliers.

_________________ Detailed Description

The MAX3942 EV kit is a fully assembled and factory

tested demonstration board that enables testing of all

MAX3942 functions.

Test Equipment Required

Test Equipment RequiredTest Equipment Required

Test Equipment Required

•

-5.2V power supply with 300mA current capability

• Signal-source, 10Gbps minimum capability

• Oscilloscope with at least 15GHz performance

Test Equipment Interface

Test Equipment InterfaceTest Equipment Interface

Test Equipment Interface

Warning: The data and clock inputs (DATA±, CLK±) are

DC-coupled to the SMA connectors, so be sure to set

proper common-mode voltages for these inputs. The

modulation outputs (OUT±) are also DC-coupled to the

SMA connectors and require a 50Ω to ground load for

proper operation.

19-3093; Rev 0; 12/0

MAX3942 Evaluation Kit

2 __________________________________________________________________________________________________

Evaluates: MAX394

_____________________________________________________________________ Quick Start

1) If the data is to be latched, place shunt on JP8

(RTEN) to enable the clock inputs. Otherwise, leave it

open.

2) Install a jumper on JP2.

3) Install a jumper on the right side of JP3. This allows

adjustment of MODSET using R3.

4) To use the pulse-width control (PWC) install a jumper

on the lower two pins of JP1. To disable PWC place a

jumper on the top two pins of JP1.

5) Ensure that a jumper is not installed on JP9 (MODEN)

and enable modulation.

6) Connect a differential signal source to J34 (DATA+)

and J33 (DATA-). Refer to the MAX3942 data sheet to

determine voltage levels.

7) If the latch is enabled, apply a differential clock signal

to J2 (CLK+) and J31 (CLK-). Refer to the MAX3942

data sheet to determine voltage levels.

8) Connect a high-bandwidth oscilloscope, such as the

Tektronix CSA8000 with 80E01 sampling heads, to

J16 (OUT+) and J6 (OUT-).

9) High-quality SMA attenuators (14dB or 20dB) are

required to reduce the signal level for compatibility

with the most sampling heads. The attenuators should

be connected directly to the output SMA connectors

on the EV kit to minimize transmission line reflections.

10) Attach a -5.2V power supply to J10 (GND) and J11

). Set the current limit to 300mA and power up

the board.

11) Adjust R3 (MODSET) until the desired modulation

swing is achieved.

12) Adjust R1 (PWC) until the desired pulse width is

achieved (if PWC is enabled, see step 5).

13) If desired, place a shunt on JP10 (PLRT) to invert the

output data polarity.

_______________________________________ Adjustments and Control Descriptions

COMPONENT NAME FUNCTION

JP1 PWC

This jumper enables/disables the pulse-width-control circuitry. Place a shunt on

the top two pins to disable the PWC circuitry. Place a shunt on the bottom two pins

to enable the PWC circuitry.

JP3 MODSET

Place a jumper on the right-hand side of this jumper to connect the R

MODSET

potentiometer to the MAX3942. Place a jumper on the left-hand side of this jumper

to connect the MODSET pin to the SMB connector for AC testing.

JP8 RTEN

Enables/disables data retiming. Shunt to enable data retiming. Remove shunt for

direct data transmission.

JP9 MODEN

Enables/disables modulation output. Shunt to disable switching of the data output.

When shunted, the output goes to the absorbtive (logic 0) state. Remove shunt to

enable modulation.

JP10 PLRT

Enables/disables the polarity inversion function. Shunt to invert the polarity of the

output data. Shunting this jumper shorts the PLRT pin to V

. Leave open for

normal operation.

R1 R

PWC

Adjusts the EAM pulse width. Turn the potentiometer screw counter-clockwise to

increase the logic 1 width.

R3 R

MODSET

Adjusts the EAM modulation current. Turn the potentiometer screw clockwise to

increase the modulation amplitude (decrease the resistance of MODSET to GND).

MAX3942 Evaluation Kit

________________________________________________________________________________________________ 3

Evaluates: MAX3942

Figure 1. MAX3942 EV Kit Schematic

P1-P3 P4-P6

MAX3942EVKIT

Mfr. #:

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MAX3942EVKIT