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. For the ISL59605IRZ-EVALZ evaluation board, see AN1598. 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 Output Connection 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. Standard 75Ω composite video is available at the “VIDEO OUT” BNC connector on the right. 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. 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 20, 2012 AN1780.1 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 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/COLORMAN” 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) • ISL59603-Coax-EVZ/ISL59960-Coax-EVZ Evaluation Board (AN1776) • 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. 2 December 20, 2012 AN1780.1 Application Note 1780 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. 3 December 20, 2012 AN1780.1 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 4 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 20, 2012 AN1780.1 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 5 December 20, 2012 AN1780.1 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 6 December 20, 2012 AN1780.1 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 7 December 20, 2012 AN1780.1