SD387EVK National Semiconductor EVK User Manual LMH0387 Evaluation Board User Guide April 29, 2010 Overview The SD387 Evaluation Kit (EVK) enables evaluation of the LMH0387 3G/HD/SD SDI Configurable I/O Adaptive Cable Equalizer / Cable Driver. A graphical user interface allows managing the SPI registers for the input mode (equalizer), and can also be used to control the device’s I/O mode.
FIGURE 1. SD387 Evaluation Board Inputs and Outputs: BNC_IO Input/Output, SDI Input, and SDO Output The bidirectional I/O (J1) is a 75Ω BNC connector. When the LMH0387 is configured as an input, the input signal on the BNC_IO pin should conform to the SMPTE 424M, SMPTE 292M, or SMPTE 259M standards. When the LMH0387 is configured as an output, the BNC_IO pin will drive SMPTE SDI signal levels (800 mVP-P into 75Ω). The SDI input connectors (J2 and J3) are 50Ω SMA connectors.
DC Power Connectors The VCC and GND power connectors should be powered with a DC input voltage of 3.3V ± 5% (3.6V maximum). JP2 Controls ¯¯¯ CD JP2 allows monitoring of the Carrier Detect (¯¯¯ CD ) at the BNC_IO pin while in the input mode (equalizer). ¯¯¯ CD is asserted low when an input signal is detected at the BNC_IO pin, and high when no input signal is present. TX_EN JP2 allows control of the TX_EN pin to enable or disable the cable driver.
SPA Dongle Description The SPA dongle is required to use the SPI interactive GUI. The SPA dongle connects between the LMH0387 SPI pins and the USB input of a PC. The SPA dongle is shown in Figure 2. JP7 is the SPI Header. The SPA dongle is powered through the USB, and the D1 LED is RED when the SPA dongle is connected to a PC via the USB to indicate the board is powered. FIGURE 2. SPA Dongle Figure 3 shows the connection between the SD387 and the SPA dongle.
Software Setup System Requirements Operating System: USB: Windows XP or Vista 2.0 Installation Download the latest software from the LMH0387 Evaluation Board page. Extract the ALPF_monthdayyear_major version_minor version.exe” (ex. ALPF_04062010_128_0002.exe) file to a temporary location that can be deleted later. Make sure the SPA dongle is not connected to the PC. The following installation instructions are for the Windows XP Operating System.
Software Description Startup Make sure all the software has been installed and the hardware is powered on and connected to the PC. Execute “Analog LaunchPAD” from the start menu. The default start menu location is “Programs\National Semiconductor Corp\Analog LaunchPAD vx.x.x\Analog LaunchPAD”. The application should come up in the state shown in Figure 4 below. If it does not, see “Trouble Shooting” at the end of this document.
FIGURE 5. LMH0387 Information Tab Functional Tab The Functional tab is the main tab of the GUI and presents a high level view of the LMH0387 equalizer, as shown in Figure 6. SD387EVK User Guide Rev 1.1 7 of 23 © 2010 National Semiconductor Corp.
FIGURE 6. LMH0387 Functional Tab I/O Mode Control The I/O Mode Control can be used to control the I/O Mode of the LMH0387, provided an additional wire is connected between the SD387 TX_EN and the SPA dongle PA0, as shown in Figure 3. The connection between TX_EN and PA0 allows software control of the LMH0387 cable driver enable functionality.
Tx Loopback Mode: Configures the LMH0387 for the output mode with a loopback path (cable driver and equalizer both enabled). The LMH0387 equalizer is set to auto sleep. If TX_EN is connected to PA0, then PA0 will drive TX_EN high to enable the LMH0387 cable driver. If this TX_EN Æ PA0 connection is not made, then the LMH0387 cable driver should be manually enabled by pulling the jumper between TX_EN and GND (TX_EN should be open).
Equalizer Output Offset The Equalizer Output Offset control shows the current value of the LMH0387 equalizer output common mode voltage and allows adjustment in 200 mV increments from 1.05V to 1.85V. At the “Max” setting, the outputs are referenced to the positive supply and the output common mode is 2.1V. The default setting is 1.25V. The Equalizer Output Offset may be set either by clicking on the “+” or “-” buttons, or by grabbing and spinning the “handle” on the knob for a quick adjustment.
Equalizer Input Launch Level Control Note: The GUI automatically sets the nominal equalizer launch amplitude setting upon startup (specifically, it writes 30h to SPI register 02h). This nominal setting is required for correct equalizer operation with the default SMPTE 800 mVP-P launch amplitude and no external attenuation. If the equalizer launch amplitude setting is changed, it can be instantly set back to this nominal setting by clicking the “Set To Default” button.
Registers Tab The Registers tab displays all registers for the LMH0387 equalizer. Figure 7 shows the Registers tab. The Value field indicates the value of the currently selected register. FIGURE 7. LMH0387 Registers Tab Each register can be examined in detail by either double clicking on the desired registers fold bar (with the address and the register name, e.g. 0x00 – General Control) or by single clicking the icon at the right of the fold bar (two inverted carats).
FIGURE 8. LMH0387 Registers Tab with Verbose Descriptions FIGURE 9. LMH0387 Registers Tab without Verbose Descriptions SD387EVK User Guide Rev 1.1 13 of 23 © 2010 National Semiconductor Corp.
The Display button provides another view of the register set and is depicted in Figure 10. The Display dialog supports the Windows copy command (Ctrl+c). FIGURE 10. LMH0387 Register Display The Load and Save buttons provide a handy mechanism for restoring or saving the register set external to the evaluation board. SD387EVK User Guide Rev 1.1 14 of 23 © 2010 National Semiconductor Corp.
Typical Performance Cable Driver Output Figure 11 shows the typical output waveform from the LMH0387 cable driver at 2.97 Gbps. The input signal is a 2.97 Gbps PRBS10 from the Agilent 86130A BERT. The input is connected differentially to the SDI SMA inputs on ¯¯¯ = 0). the SD387 with matched 3’ SMA cables. The LMH0387 cable driver slew rate is set for HD/3G mode (SD/HD The SD387 BNC_IO output is connected through 1m of Belden 1694A cable to the TCA75 75Ω input module on the Tektronix DSA7125 12.
Equalizer Output Figure 12 shows the typical output waveform from the LMH0387 equalizer at 2.97 Gbps with 120m Belden 1694A cable on the input. The input signal is a 2.97 Gbps PRBS10 from the Agilent 86130A BERT. The input is connected differentially to the SDI SMA inputs on an SD302 eval board with matched 3’ SMA cables. The SD302 output signal is driven through 120m of Belden 1694A cable and received at the BNC_IO input on the SD387.
Input and Output Return Loss Figure 13 shows the LMH0387 input and output return loss measured at the BNC_IO on the SD387. The return loss is measured on the Rohde & Schwarz ZVR 75Ω 4GHz network analyzer, with a 75Ω BNC to 75Ω Type N connector on the input. For the input return loss, the equalizer is active and the cable driver is disabled (TX_EN = 0).
Trouble Shooting If the following window (Figure 14) opens after starting the ALP software, double check the hardware setup. FIGURE 14. Analog LaunchPAD No Devices Error It may also be that the USB driver is not installed. Check the device manager. There should be an ”NSC ALP Nano Atmel” device under the “Universal Serial Bus Controllers” as shown in Figure 15. FIGURE 15. Windows XP, Analog LaunchPAD USB Driver The software should start with only “LMH0387 - Nano” in the “Devices” pull down menu.
FIGURE 16. Analog LaunchPAD in Demo Mode Disable the demo mode by selecting the “Preferences” pull down menu and un-checking “Enable Demo Mode”. FIGURE 17. Analog LaunchPAD Preferences Menu After demo mode is disabled, the ALP software will poll the ALP hardware. The ALP software will update and have only “LMH0387- Nano” under the “Devices” pull down menu. SD387EVK User Guide Rev 1.1 19 of 23 © 2010 National Semiconductor Corp.
FIGURE 18. Analog LaunchPAD Screen with Demo Mode Off SD387 Bill of Materials Reference Designator C1, C2, C4, C5, C6, C7, C8 C3, C11 C9, C12, C13, C14 C10 D1 J1 Qty 7 2 4 1 1 1 Description Capacitor, 4.7uF, 6.3V, X5R, 0402 Capacitor, 1uF, 6.3V, X5R, 0402 Capacitor, 0.1uF, 16V, X5R, 0402 Capacitor, 0.01uF, 16V, X7R, 0402 LED, Green, 0603 BNC, Amphenol, 75-ohm, edge launch J2, J3, J4, J5 JP1 JP2 PS1, PS2 R1 R2 R3 R4 R5 R6 4 1 1 2 1 1 1 1 1 1 SMA, 50-ohm, edge launch Header, 6x1, 0.1" Header, 4x2, 0.
A B C D GND PS2 2 1 1 1 VCC GND PS1 I/O 2 1 J1 Z75_1 BNC_EDGE LAYOUT NOTE: C8 4.7uF Z75_n: W=20MIL, ZO=75+/-5% C9 0.1uF C1 4.7uF 2 VCC C10 0.01uF GND R2 75 GND Z75_2 R3 220 GND 2 C2 4.7uF Z75_3 VCC Z75_4 GND C12 0.1uF C3 1uF SCK MOSI MISO SSb GND 1 2 3 4 5 6 7 8 9 10 11 12 VCC GND C13 0.
SPA Dongle Bill of Materials Reference Designator CR2,CR1 C1,C2,C3,C4,C5,C6,C100 C7 C8,C9 C10,C11 C14 C15 Qty 2 7 1 2 2 1 1 Description SUPPRESSOR ESD 24VDC 0603 SMD CAP CER .1UF 50V 10% X7R 0603 CAPACITOR TANT 1.0UF 16V 10% SMD CAP CER .22UF 50V Y5V 0603 CAP CERAMIC 12PF 50V NP0 0603 CAPACITOR TANT 4.
VCC C3 AVCC R1 0603 0ohm C2 A VCC J2 1 3 5 7 9 2 4 6 8 10 PE6 PE4 PE2 PE0 PF[7..0] 2x5 pin Jumper_open PE[7..0] C4 0.1uF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 LAYOUT NOTE: D+ D- resistors close to the MCU LAYOUT NOTE: C5 next to pin 3 of U1 PE7 PE5 PE3 PE1 VCC AVCC C5 0.
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