AN1776 - Intersil

AN1776 - Intersil
Application Note 1776
ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Evaluation
Board
Description
Input Connection
The ISL59603-Coax-EVZ/ISL59960-Coax-EVZ is a standalone
board designed for evaluation of the ISL5960x (MegaQ™) and
ISL59960 (960MegaQ™) parts without digital programming. It
also provides the reference schematic and PCB layout of a
typical MegaQ™/960MegaQ™ coaxial application. This
reference schematic is easy to implement and is only needed
at the receive side of the transmission path. For the
ISL59605IRZ-EVALZ evaluation board, see AN1598.
Coax signals are connected through the “VIDEO IN” BNC
connector on the left side of the board.
Power Connection and PCB Layout
The DIP switch (SW1) is used to put MegaQ™/960MegaQ™ in
its different operational modes (recommended settings are
underlined):
The power connector is at the top left of the evaluation board.
The board requires a +12V DC power supply capable of
supplying at least 100mA.
The board uses the ISL8500 DC/DC buck converter to
generate the +5V supply for the chip. MegaQ™/960MegaQ™
employs up to 70dB of high frequency gain to equalize long
lengths of cable; therefore, the ground for the ISL8500 is
isolated from the ground of the MegaQ™/960MegaQ™ except
at the bypass capacitor (C7). This is done to prevent the
switching noise from coupling into the MegaQ™/960MegaQ™
ground and corrupting the output signal when utilizing high
equalization.
The PCB was laid out so that the feedback path from the +5V
output back to pins 1 and 2 on the ISL8500 does not cross any
of the high current switching components (L1 and D1). For
more details on the power supply layout, see Figures 3-6.
Output Connection
Standard 75Ω composite video is available at the “VIDEO OUT”
BNC connector on the right side of the board.
Switch Settings
• Continuous/Lock until Reset: When set to “Continuous”,
MegaQ™ will continuously update the EQ settings. When set
to “Lock until Reset”, the FREEZE input is connected to the
LOCKED output so that the device will stop updating once
the first optimum solution is reached. “Lock until Reset” is
the recommended mode of operation. See the datasheet for
more detailed information on the locking modes.
• COLOR-AUTO/COLOR-MAN: Determines whether the COLOR
pin is floating (“Auto”) or set by the “COLOR-0/COLOR-1”
switch (“Man”). When set to “Auto”, MegaQ™/960MegaQ™
will automatically determine if the incoming signal is color or
monochrome. If set to “Man” (manual) the polarity of the
COLOR pin is determined by the “COLOR-0/COLOR-1” switch.
FIGURE 1. TOP VIEW OF EVALUATION BOARD
December 20, 2012
AN1776.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved.
Intersil (and design) and MegaQ are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1776
FIGURE 2. BOTTOM VIEW OF EVALUATION BOARD
• INV-AUTO/INV-MAN: Determines whether the INVERT pin is
floating (“Auto”) or set by the “INV-0/INV-1” switch (“Man”).
When set to “Auto”, MegaQ™/960MegaQ™ will automatically
determine the polarity of the incoming signal. If set to “Man”
(manual), the polarity of the INVERT pin is determined by the
“INV-0/INV-1” switch.
• FREEZE-0/FREEZE-1: Slide the switch left to the “0” position to
put the part in Continuous Update mode. The “1” position
freezes the equalizer in its current state. This switch is ignored
when the “Continuous/Lock until Reset” switch is set to “Lock
until Reset”. See the datasheet for more detailed information
on the locking modes.
• EQ DIS-0/EQ DIS-1: This can be used to disable the EQ so that
an external source can drive a signal over the cable. This
switch should be set to the “0” position for normal operation.
• COLOR-0/COLOR-1: Slide the switch left to the “0” position to
force monochrome (sync tip) equalization mode. Slide the
switch right to the “1” position to force color-burst equalization
mode. This switch is ignored when the “COLOR-AUTO/COLORMAN” switch is set to the “Auto” position.
• INV-0/INV-1: Slide the switch left to the “0” position for
nominal input signal polarity (positive signal on IN+ and
negative signal on IN-). Slide the switch right to “1” position for
inverted polarity (positive signal on IN- and negative signal on
IN+). This switch is ignored when the “INV-AUTO/INV-MAN”
switch is set to the “Auto” position.
LEDs
There are 5 LEDs at the bottom right of the board that indicate the
current state of the EQ_DIS, COLOR, INVERT, LOCKED, and FREEZE
signals. When any LED is illuminated then the corresponding
signal is a logic high. When the LEDs are illuminated, they will
draw additional supply current from the 5V supply.
Related Documents
• ISL5960x Datasheet (FN6739)
• ISL59960 Datasheet (FN8358)
• ISL59605-SPI-EVALZ/ISL59960-SPI-EVALZ Evaluation Board
(with Serial Interface) Operation (Rev 5.0) (AN1775)
• ISL59605-Catx-EVZ/ISL59960-Catx-EVZ Evaluation Board
(AN1780)
Troubleshooting
1. Make sure all the switches are in the correct position for the
intended operation.
2. Verify that there is +12V at the “12V” test point and +5V at the
“5V” test point. Check that the “EQ DIS” switch is set to “0”.
3. You should see a signal on IN+ and a DC voltage on IN-. If you
do not see the expected signals, inspect your cables, video
sources, etc.
4. If you see the correct input signal on IN+ and IN- but are still
not seeing a valid output signal, set the “INV-Auto/INV-Man”
to the “Auto” position or set it to the “Man” position and set
the “INV-0/INV-1” switch to the “0” position.
5. Probe the VIDEO OUT BNC connector with a scope to see if
there is a video signal. If you do not see a composite video
signal at the output, and there is a signal present at the input,
then the device may be damaged, in which case, please
contact your vendor.
2
December 20, 2012
AN1776.1
ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Evaluation Board Schematic
1
+12V
J1
POWER
TP1
C6
+12VIN
3
4.7uF
R6
R23
300
3.16k
U1
1
C5
R9
69.8k
2
C10
22pF
C9
3
100nF
4
220pF
5
3
R7
2k
R8
23.2k
ISL8500
FB
VIN
COMP
VIN
SS
PHASE
EN
PHASE
PG
6
BOOT
Pad
Sense (NC)
GND
VDD
12
C19
0.1uF
11
+5V
97uH
C11
100nF
8
7
+5V
L1
9
R11 10
TP3
C7
4.7uF
D1
BAT42-W-7
C12
1.0uF
C8
330pF
C20
0.01uF
10
R12
100k
TP2
C13
1.0uF
C14
0.1uF
R10
R13
100k
R14
100k
R15
100k
14
2
U2
+5V
20k
R16
+5V
2
1
0
4
SW1A
0
16
2
1
R3
1k
5
R2
37.4
IN+
IN-
DIFF to SE
+ CLAMP
EQ
VIDEO OUT
CFB
C2
INVERTM
1
0
7
10
11
SW1G
0
14
8
SW1H
GND
75.0
12
9
1
U2 generates low
impedance 1s or 0s
without drawing
large static current.
U2, SW1, and
associated
components are for
evaluation use and
usually not needed in
a production design.
VIDEO OUT
J3
R4
10
1
13
74HC04
13
11
1
C3
47nF
C4 300
1500pF
EP
GND
GNDo
9
FREEZE
LOCKED
EQ_DIS
COLOR
INVERT
R5
GND
1.0uF
GND
Z2
+5V Transorb
GNDIN
COAX_GND
8
12
16
10
7
8
9
1.0uF
3
COLORM
12
1
SW1F
0
FREEZE
LOCKED
EQ_DIS
COLOR
INVERT
DIGITAL BLOCK
5
7
ISL5960X Equalizer
0
6
1
VREF
SEN
SD
SCK
VDD2
VDD1
+5V Transorb
C1
15
SW1C
3
U4
Z1
SW1B
0
15
18
19
20
11
2
1
C18
0.47uF
C17
0.1uF
0.1uF
D7
1N4148
COAX IN
R1
37.4
EQ_DISM
6
C16
R24
10k
C21
0.1uF
3
R17
0.0
C22
0.1uF
SW1E
5
+5V
C
C15
+5V
LED Status Indicators
14
17
14
6
4
1
ISL59600
U3
R18
1k
+5V
0.1uF
FREEZE
1
2
LOCKED
3
4
INVERT
5
6
EQ_DIS
9
8
D2 FREEZE_LED
BLUE
GREEN
SO1
STANDOFF
SO2
STANDOFF
SO3
STANDOFF
SO4
STANDOFF
ORANGE
RED
11
10
R20
1k
R21
1k
R22
1k
D3 LOCKED_LED
D4 INVERT_LED
D5 EQ_DIS_LED
D6 COLOR_LED
YELLOW
LEAD FREE
RoHS COMPLIANT
12
GND
13
INTERSIL IN
74HC04
7
December 20, 2012
AN1776.1
COLOR
R19
1k
Title
Application Note 1776
+5V
J2
FREEZEM
100k
Application Note 1776
ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Board Layout
FIGURE 3. PCB TOP LAYER WITH SILKSCREEN
FIGURE 4. PCB BOTTOM LAYER WITH SILKSCREEN
4
December 20, 2012
AN1776.1
Application Note 1776
ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Board Layout
(Continued)
FIGURE 5. PCB TOP LAYER
FIGURE 6. PCB BOTTOM LAYER
5
December 20, 2012
AN1776.1
Application Note 1776
Bill of Materials
QUANTITY
COMPONENT NAME
1
J1
2
Z1, Z2
VALUE
FOOTPRINT
+12VIN
Power Conn
CPDFR5V0
1005
1
D7
1N4148
SOD-323F
1
R17
0.0
0603
1
C20
0.01µF
0603
6
C14, C15, C16, C17, C19, C21
0.1µF
0603
1
C22
0.33µF
0603
1
C18
0.47µF
0603
4
C1, C2, C12, C13
1.0µF
0603
1
R11
10
0603
5
R12, R13, R14, R15, R16
100k
0603
2
C10, C11
100nF
0603
1
R24
1
C4
6
R3, R18, R19, R20, R21, R22
1
R10
1
C9
220pF
0603
1
C5
22pF
0603
1
R8
23.2k
0603
1
R7
2k
0603
1
R6
3.16k
0603
2
R5, R23
300
0603
1
C8
2
R1, R2
1
1
10k
0603
1500pF
0603
1k
0603
20k
0603
330pF
0603
37.4
0603
R9
69.8k
0603
R4
75.0
0603
2
C6, C7
4.7µF
0805
1
C3
47nF
0805
1
L1
97µH
1812
2
U2, U3
74HC04
TSSOP-14
1
U4
ISL59600
QFN20 4MM
1
U1
ISL8500
DFN12 4X3MM
1
D1
BAT42-W-7
SOD-123
1
D2
BLUE
LED-0805
1
D4
ORANGE
LED-0805
1
D5
RED
LED-0805
1
D6
YELLOW
LED-0805
1
D3
GREEN
LED-0805
1
J2
BNC
BNC-EDGE
1
J3
VIDEO OUT
BNC-EDGE
1
SW1
SWITCH-DIP16
SWITCH-DIP8X2
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
6
December 20, 2012
AN1776.1
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