an1780

Application Note 1780
ISL59605-Catx-EVZ/ISL59960-Catx-EVZ Evaluation
Board
Description
Input Connection
The ISL59605-Catx-EVZ/ISL59960-Catx-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™ Cat x application. This reference
schematic is easy to implement and is only needed at the
receive side of the transmission path.
Unshielded twisted pair (UTP) signals arrive via the RJ-45 Cat 5
connector on the left. The input signal can be on any arbitrary
combination of pins, though it would typically be one of the
standard Cat x pairs of 1 and 2, 3 and 6, 4 and 5, or 7 and 8.
The 3x8 jumper block to the right of the RJ-45 jack is used to
assign which Cat x pin goes to the positive
MegaQ™/960MegaQ™ input (in Figure 1, it’s pin 8), and which
goes to the negative input (pin 7).
Power Connection and PCB Layout
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.
Switch Settings
The DIP switch (SW1) is used to put MegaQ™/960MegaQ™ in
its different operational modes (recommended settings are
underlined):
• 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 is determined by the “COLOR-0/COLOR-1” switch.
FIGURE 1. TOP VIEW OF EVALUATION BOARD
December 21, 2015
AN1780.2
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, 2015. 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 1780
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/COLOR-MAN”
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.
2
Related Documents
• ISL5960x Datasheet (isl59601-02-03-04-05.pdf)
• ISL59960 Datasheet (isl59960.pdf)
• ISL59605-SPI-EVALZ/ISL59960-SPI-EVALZ Evaluation Board
(with Serial Interface) Operation (Rev 5.0) (AN1775)
• ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Evaluation Board
(AN1776)
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. Probe the IN+ and IN- pins for a video signal. You should see
a signal on both inputs (with IN- being the inverse of the signal
on IN+). If you do not see the expected signals, inspect your
cables, video sources, etc. Verify that the jumpers in the
jumper block are set correctly. If you are not certain which
pair of Cat x wires is carrying the signal, you can probe the
middle row of 8 pins in the jumper block, where you should
see the signal on 2 of them.
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”
switch to the “Auto” 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.
December 21, 2015
AN1780.2
ISL59605-Catx-EVZ/ISL59960-Catx-EVZ Evaluation Board Schematic
+12V
J1
POWER
TP1
4.7uF
R6
Sense (NC)
R23
300
3.16k
U1
1
C5
R9
69.8k
2
22pF
C9
220pF
C10
3
100nF
4
5
R7
2k
C6
+12VIN
R8
23.2k
ISL8500
FB
VIN
COMP
VIN
SS
PHASE
EN
PHASE
PG
6
BOOT
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
3
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
1
3
Pad
2
U2
+5V
20k
R16
+5V
2
1
FREEZEM
0
3
EQ_DISM
6
5
COLORM
8
9
INVERTM
6
C17
0.1uF
0
16
2
1
0
15
19
20
11
2
18
C16
0.1uF
1
C18
0.47uF
H3
R3
R2
49.9
5
IN-
DIFF to SE
+ CLAMP
EQ
VIDEO OUT
CFB
C2
16
10
7
8
9
FREEZE
LOCKED
EQ_DIS
COLOR
INVERT
75.0
12
H6
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
13
9
1
C3
47nF
C4 300
1500pF
EP
GND
1.0uF
8
13
74HC04
R5
GNDo
+5V
C
17
14
ISL59600
C15
H7
LED Status Indicators
U3
R18
1k
+5V
0.1uF
H8
CAT5IN-
+5V
14
H5
1k
RJ-45
Pin-Assignment
Headers
IN+
GND
H4
3
1
CAT5 IN
RJ1
RJ2
RJ3
RJ4
RJ5
RJ6
RJ7
RJ8
GNDIN
SHIELD
1
2
3
4
5
6
7
8
6
A
SHIELD
11
12
FREEZE
LOCKED
EQ_DIS
COLOR
INVERT
DIGITAL BLOCK
10
10
1
SW1H
0
1.0uF
4
A
R1
49.9
GND
J2
ISL5960X Equalizer
1
11
1
SW1G
0
14
GND
C1
0
SW1F
0
7
7
+5V Transorb
H2
RJ45 Input for
Cat x Cable
1
VREF
SEN
SD
SCK
VDD2
VDD1
Z1
15
SW1C
3
U4
CAT5IN+
H1
SW1B
12
1
FREEZE
1
2
LOCKED
3
4
BLUE
Z2
+5V Transorb
GREEN
INVERT
SO1
STANDOFF
SO2
STANDOFF
SO3
STANDOFF
SO4
STANDOFF
5
6
ORANGE
EQ_DIS
9
8
RED
COLOR
11
R19
1k
D2 FREEZE_LED
10
R20
1k
R21
1k
R22
1k
D3 LOCKED_LED
D4 INVERT_LED
D5 EQ_DIS_LED
D6 COLOR_LED
YELLOW
12
GND
13
LEAD FREE
RoHS COMPLIANT
INTERSIL IN
7
74HC04
Title
December 21, 2015
AN1780.2
Size:
B
Application Note 1780
4
R17
0.0
SW1A
SW1E
5
100k
Application Note 1780
ISL59605-Catx-EVZ/ISL59960-Catx-EVZ Board Layout
2400 (mil)
FIGURE 3. PCB TOP LAYER WITH SILKSCREEN
BottomLayer
3600 (mil)
FIGURE 4. PCB BOTTOM LAYER WITH SILKSCREEN
4
December 21, 2015
AN1780.2
Application Note 1780
ISL59605-Catx-EVZ/ISL59960-Catx-EVZ Board Layout
(Continued)
2400 (mil)
FIGURE 5. PCB TOP LAYER
BottomLayer
3600 (mil)
FIGURE 6. PCB BOTTOM LAYER
5
December 21, 2015
AN1780.2
Application Note 1780
Bill of Materials
QUANTITY
COMPONENT NAME
1
J1
2
Z1, Z2
1
R17
VALUE
FOOTPRINT
+12VIN
Power Conn
CPDFR5V0
1005
0.0
0603
1
C20
0.01µF
0603
5
C14, C15, C16, C17, C19
0.1µF
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
C4
1500pF
0603
6
R3, R18, R19, R20, R21, R22
1k
0603
1
R10
20k
0603
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
330pF
0603
2
R1, R2
49.9
0603
1
R9
69.8k
0603
1
R4
75.0
0603
2
C6, C7
4.7µF
0805
1
C3
47nF
0805
1
L1
97µH
1812
1
D1
BAT42-W-7
SOD-123
1
D2
BLUE
LED-0805
1
D3
GREEN
LED-0805
1
D6
YELLOW
LED-0805
1
D4
ORANGE
LED-0805
1
D5
RED
LED-0805
1
J2
CAT5 IN
Modular-8S
1
J3
VIDEO OUT
BNC-EDGE
8
H1, H2, H3, H4, H5, H6, H7, H8
HEADER-3PIN
HEADER-3P-0.05
1
U4
ISL59600
QFN20 4MM
1
U1
ISL8500
DFN12 4X3MM
2
U2, U3
74HC04
TSSOP-14
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 21, 2015
AN1780.2
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