Semtech GS3440 Manuale utente

EB-GS3440

Evaluation Board User Guide

1 of 10

GS3440

EB-GS3440

Evaluation Board User Guide

57964 - 0 June 2012

www.semtech.com

EB-GS3440

Evaluation Board User Guide

57964 - 0 June 2012

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Contents

1. Evaluation Board User Guide ....................................................................................................................4

1.1 SDI Inputs and Outputs ..................................................................................................................4

1.2 Power ....................................................................................................................................................4

1.3 Switch Settings ..................................................................................................................................5

1.4 Jumper Settings .................................................................................................................................5

1.5 Potentiometer Settings ....................................................................................................................6

1.5.1 OP_CTL Potentiometer Settings.......................................................................................6

1.5.2 Squelch Adjust (SQ_ADJ) Potentiometer Settings .....................................................6

1.6 LED Indicator .....................................................................................................................................6

2. Schematic.........................................................................................................................................................7

3. Board Layout...................................................................................................................................................8

4. Bill of Materials...............................................................................................................................................9

Version ECR Date Changes and / or Modifications

0 158253 June 2012 New document

EB-GS3440

Evaluation Board User Guide

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General Description

The GS3440 evaluation package is designed to accelerate the evaluation process of the

GS3440 Adaptive Cable Equalizer.

It is strongly recommended to read the GS3440 Data Sheet (Doc ID: 56482) before using

this evaluation kit.

Evaluation Kit Contents

• Gennum EB-GS3440 Evaluation Board

• CD containing GS3440 collateral

Overview

The purpose of the EB-GS3440 Evaluation Board is to evaluate the GS3440 Extended

Reach 3G/HD/SD Adaptive Cable Equalizer with a single output. This device is designed

to support SMPTE ST 424, SMPTE ST 292 and SMPTE ST 259 serial digital video signals

standards, and is optimized for performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s data

rates.

EB-GS3440 Functional Block Diagram

SW1 GS3440

Inputs

BNC GS3440

IRL

GS3440 Power

Supply Connection

SMA

DDO

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1. Evaluation Board User Guide

Figure 1-1 shows the inputs, outputs and power connections for the EB-GS3440.

Figure 1-1: GS3440 Evaluation Board (EB-GS3440)

1.1 SDI Inputs and Outputs

The GS3440 is a high-speed BiCMOS integrated circuit designed to equalize and restore

signals received over 75Ωco-axial cables. The EB-GS3440 is the evaluation board for the

GS3440. The EB-GS3440 features one 75Ωsingle-ended input through a BNC connector

(SDI/J1), and one pairs of 100Ωdifferential outputs (DDO/J2, DDO/J3) through SMA

connectors.

1.2 Power

The EB-GS3440 features three power posts (3V3, GND, VCCO). By default, the GS3440

can be powered with a single power supply connected to 3.3V. Alternatively, the

GS3440 outputs can be powered using a second power supply connected to VCCO. The

power configuration jumpers VCCO_SEL must be configured accordingly.

When the outputs are powered separately, the voltage supplied to VCCO can be set

between 1.2V and 3.3V.

ON CTS

219

727

1 2

50Ω DIFFERENTIAL

OUTPUTS

GAIN SELECT

SWITCH SETTING

BYPASS SWITCH

SETTING

CARRIER DETECT

INDICATOR

CD INDICATOR

ENABLE JUMPER

75Ω SINGLE-ENDED

INPUT

POTENTIOMETER

for OP_CTL

POWER SUPPLY

CONFIGURATION JUMPERS

EXTERNAL SUPPLY

3.3V STEADY SUPPLY

POTENTIOMETER

for SQ_ADJ

Legend

Capacitor (Cx)

Resistor (Rx)

Inductor (Lx)

GS3440

XXXXE3

YYWW

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1.3 Switch Settings

A two-point dip switch (SW1) provides the GS3440’s input selection. The switch

positions are marked on the silkscreen, and are described in Table 1-1 below:

1.4 Jumper Settings

The jumpers on the EB-GS3440 board are described in the following tables:

Table 1-1: SW1 Settings

Switch Label Switch OFF Description Switch ON Description

GS 0Gain Select off, no change in gain

(default) 1Gain Select on, 6dB gain

BP 0 Bypass off (default) 1 Bypass on

Table 1-2: AUTOSLEEP (JP2) Jumper Settings

Label Connection Description

Connected (default) Enables the AUTOSLEEP function

Unconnected Disables the AUTOSLEEP function

Table 1-3: VCCO_SEL (JP3) Jumper Settings

Label Connection Description

SS (default) Shared supply mode

EXT Output uses a separate external supply

Table 1-4: LED_EN (JP4) Jumper Settings

Label Connection Description

Connected (default) LED is enabled

Unconnected LED is disabled

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1.5 Potentiometer Settings

Adjusting the potentiometers clockwise will decrease the voltage level at the SQ_ADJ

and OP_CTL pins. Adjusting the potentiometers counter-clockwise will increase the

voltage level at the SQ_ADJ and OP_CTL pins.

1.5.1 OP_CTL Potentiometer Settings

The output control potentiometer settings are described in Table 1-5 below:

1.5.2 Squelch Adjust (SQ_ADJ) Potentiometer Settings

There is one multi-turn potentiometer on the EB-GS3440 assigned for squelch adjust,

which adjusts the voltage seen at the SQ_ADJ pin. This input adjusts the threshold of the

CD pin. When the SQ_ADJ input is 0V, all cable lengths will be equalized. When the

SQ_ADJ input is 3.3V, there will be no equalization regardless of the cable length. Please

refer to the GS3440 Data Sheet for more details on carrier detect and squelch adjust.

1.6 LED Indicator

D1 is the Carrier Detect LED for the GS3440. D1 is on when no carrier is detected and

stays off otherwise. There is one LED_EN jumper which when disconnected, it disables

the LED. This is useful when measuring system power dissipation.

Table 1-5: OP_CTL Input Settings

Level Swing De-emphasis Mute Voltage

0 800mV Off N 0.000 - 0.083

1 800mV 2dB N 0.234 - 0.394

2 800mV 4dB N 0.545 - 0.704

3 800mV 6dB N 0.856 - 1.015

4 400mV Off N 1.166 - 1.333

5 400mV 2dB N 1.484 - 1.644

6 400mV 4dB N 1.795 - 1.954

7 400mV 6dB N 2.106 - 2.265

8 400mV N/A Y 2.416 - 2.500

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2. Schematic

Figure 2-1: GS3440 Schematic

13 16

TAB

BYPASS_94

LED DISABLE JUMPER

AUTO-SLEEP

POWER SUPPLIES

4.7nH

VCC_A_94

DNP

RED

VCC_A_94

4.7μF

VCC_DIG_94

10nF

WHITE

VCC_A_94

BLACK

10nF

75Ω

GS3440

470nF

37.4Ω

VCC_A_94

5.0kΩ

SMA

4.7nH

SWDIP2

WHITE

1μF

SMA

VCC_A_94

RED

100kΩ

MMBT3904

14kΩ

1.21kΩ

YELLOW

VCC_DIG_94

365Ω

VCC_O_94

1μF

221Ω

5.0kΩ

75Ω

BNC

10nF

100nF

VCC_O_94

10μF

100nF

R6R5

R12

SW1

TP1

R28

TP2

JP1

R29

JP4

TP4

C15

C14

C13

JP3

C12

TP3

TP5

JP2

U2 J3

C10

J1L1

CDB_94

BYPASS_94

321

TAB

VCC_A

SLEEP

VCC_O

VEE_O

DDO

OP_CTL

SQ_ADJ

BYPASS

AGC

GAIN_SEL

SDI

VEE_A

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3. Board Layout

Figure 3-1: Layer 1 (Top Layer) and Top Silkscreen Figure 3-2: Layer 2 (Ground)

Figure 3-3: Layer 3 (Power) Figure 3-4: Layer 4 (Bottom)

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4. Bill of Materials

Table 4-1: Bill of Materials

Quantity Reference Designator Part

4C1,C2,C7,C8Capacitor, ceramic; 10,000pF, 16V, 10%, X7R 0402

2C3, C4Capacitor, ceramic; 1.0μF, 10V, 10%, X5R 0402

2C9, C10 Capacitor, ceramic; 4.7UF, 10V, 10%, X5R 0603

2C12,C14 Capacitor, ceramic; 0.1μF, 16V, X5R 0603

2C13, C15 Capacitor, tantalum; 10μF, 10V, 10%, 3216/1206

1C5Capacitor, ceramic; 1.0μF, 10V, 10%, X5R 0402

1 D1 LED, red; TSS type SMD

1J1 Connector; BNC, edge-mount, Bulkhead/PCB

(BNC-75OHM-EDGE)

2J2,J3 Connector; SMA, edge-mount, short signal pin

(SMA-50OHM-EDGE)

2 JP2, JP4 Connector; header 2mm single straight 36-position

(2 positions used)

1JP3 Connector; header 2mm single straight 36-position

(3 positions used)

2 L1, L2 Inductor; 4.7nH, 300mA, 0402

1 Q4 Transistor; GP NPN AMP SOT23-3

1 R2 Resistor; 365Ω, 1/16W, 1%, 0402 SMD

2 R3, R5 Resistor; 75.0Ω, 1/16W, 1%, 0402 SMD

1 R4 Resistor; 1.21kΩ, 1/16W, 1%, 0402 SMD

1 R7 Resistor; 221Ω, 1/16W, 1%, 0402 SMD

1 R8 Resistor; 37.4Ω, 1/16W, 1%, 0402 SMD

1 R9 Resistor; 14.0kΩ, 1/16W, 1%, 0402 SMD

1 R12 Resistor; 100Ω, 1/16W, 1%, 0402 SMD

3 R28, R29 Potentiometer; 5.0kΩ1/4W 10% 4mm cermet top

SMD 5-turn

1SW1 Switch; tape seal 2-position SMD

2 TP1, TP2 Test Point, PCmulti-purpose (white)

1 TP3 Test Point, PCmulti-purpose (yellow)

1 TP4 Test Point, PCmulti-purpose (red)

1 TP5 Test Point, PCmulti-purpose (black)

1U2 Gennum GS3440 3Gb/s Adaptive Cable Equalizer,

QFN16-4X4X1MM-0P65MM

owner. The information presented in this document does not form part of any quotation or contract, is believed to be

accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any

consequence of its use. Publication thereof does not convey nor imply any license under patent or other industrial or

intellectual property rights. Semtech assumes no responsibility or liability whatsoever for any failure or unexpected

operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or

electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or

operation outside the specified range.

SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN

LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF SEMTECH

PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S OWN RISK.

Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall

indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all

claims, costs damages and attorney fees which could arise.

Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners.

DOCUMENT IDENTIFICATION

EVALUATION BOARD USER GUIDE

Information relating to this product and the application or design described

herein is believed to be reliable, however such information is provided as a

guide only and Semtech assumes no liability for any errors in this document, or

for the application or design described herein. Semtech reserves the right to

make changes to the product or this document at any time without notice.

EB-GS3440

Evaluation Board User Guide

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Contact Information

Semtech Corporation

Gennum Products Division

200 Flynn Road, Camarillo, CA 93012

Phone: (805) 498-2111, Fax: (805) 498-3804

www.semtech.com

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