Semtech GS3440 User guide

Brand
Semtech
Model
GS3440
Type
User guide
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
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 75Ω co-axial cables. The EB-GS3440 is the evaluation board for the
GS3440. The EB-GS3440 features one 75Ω single-ended input through a BNC connector
(SDI/J1), and one pairs of 100Ω differential 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 0
Gain Select off, no change in gain
(default)
1 Gain 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
3
4
2
1
12
1
13
16
TAB
8
14
2
3
9
4
11
10
15
7
6
5
BYPASS_94
LED DISABLE JUMPER
AUTO-SLEEP
POWER SUPPLIES
4.7nH
VCC_A_94
DNP
RED
VCC_A_94
4.7μF
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
10nF
100nF
VCC_O_94
10μF
10μF
100nF
R6 R5
R9
D1
R12
Q4
SW1
TP1
C1
R28
TP2
C2
JP1
R29
JP4
TP4
C15
C14
C13
JP3
C12
TP3
TP5
C7
C8
JP2
R7
U2
J3
J2
C10
C9
J1
L1
L2
R3
R8
C4
C3
CDB_94
BYPASS_94
3
2
1
TAB
VCC_A
CD
SLEEP
VCC_O
VEE_O
DDO
DDO
OP_CTL
SQ_ADJ
BYPASS
AGC
AGC
GAIN_SEL
SDI
SDI
VEE_A
C
B
E
1
ON
1
2
3
3
2
1
1
2
3
1
2
21
C5
R2
R4
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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
4 C1,C2,C7,C8 Capacitor, ceramic; 10,000pF, 16V, 10%, X7R 0402
2 C3, C4 Capacitor, ceramic; 1.0μF, 10V, 10%, X5R 0402
2 C9, C10 Capacitor, ceramic; 4.7UF, 10V, 10%, X5R 0603
2 C12,C14 Capacitor, ceramic; 0.1μF, 16V, X5R 0603
2 C13, C15 Capacitor, tantalum; 10μF, 10V, 10%, 3216/1206
1 C5 Capacitor, 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; 5.0kΩ 1/4W 10% 4mm cermet top
SMD 5-turn
1 SW1 Switch; tape seal 2-position SMD
2 TP1, TP2 Test Point, PC multi-purpose (white)
1 TP3 Test Point, PC multi-purpose (yellow)
1 TP4 Test Point, PC multi-purpose (red)
1 TP5 Test Point, PC multi-purpose (black)
1 U2 Gennum GS3440 3Gb/s Adaptive Cable Equalizer,
QFN16-4X4X1MM-0P65MM
© Semtech 2012
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright
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.
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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
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION
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Semtech GS3440 User guide

Brand
Semtech
Model
GS3440
Type
User guide
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