Texas Instruments LMH1208, User Manual

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Setup
7 SNAU205A – March 2017 – Revised August 2019
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LMH1297EVM Evaluation Board
Table 4. Description of Connections in SMBus Mode (MODE_SEL = Level L)
COMPONENT NAME COMMENTS
J6 SPI_MISO Leave Pin 1 and 2 open for proper SMBus operation.
J8 SMBus Access
SMBus access pins. See the data sheet and EVM schematic for detailed
pinout information.
J9 SMBus Access
External 2-k
Ω
pullup resistor to 3.3-V supply. Install shunt jumpers on Pin
7-8 and 9-10 for proper operation. Leave Pins 1-6 open.
See the data sheet for additional information on SMBus operation.
J13 MODE_SEL Level L: SMBus Mode
J16 ADDR0
4-Level strap pins to determine up to 16 unique SMBus address with J17
to create AD[1:0]. See the data sheet for different SMBus address
combinations.
J17 ADDR1
4-Level strap pins to determine up to 16 unique SMBus address with J16
to create AD[1:0]. See the data sheet for different SMBus address
combinations.
NOTE: Jumpers not listed in Table 4 are identical to the functions mentioned in Table 3 .
Table 5. Input and Output Channel Connections
SIGNAL INPUTS AND OUTPUTS
JUNCTION NUMBERS FUNCTION
J20 (BNC Single-Ended)
J21 (BNC Single-Ended)
J22, J23 OUT0+, OUT0– (SMA)
J24, J25 IN0+, IN0– (SMA)
5.2 Software/Hardware Description and Setup
By factory default, the LMH1297EVM is configured in CD Mode to accept a valid SDI signal on IN0 and
output the retimed data on OUT0, SDI_IO, and SDI_OUT without programming the LMH1297 beforehand.
The LMH1297EVM can also be configured by the user to operate in EQ Mode.
The general procedure for setting up and testing with the LMH1297EVM is as follows. For hardware setup
and connections in the steps below, reference the illustrations in
Figure 4 and Figure 5 .
1. Connect 2.5-V power (0.5-A maximum) to the EVM and install the appropriate shunt jumpers to
operate in SMBus Mode:
1. Connect J3: VIN = 2.5 V and J1: GND.
1. Install shunt jumper on J4 Pins 1-2.
2. Set the following jumper settings for appropriate operation:
1. Install shunt jumper on J5 Pins 1-2.
2. Install shunt jumper on J7 Pins 1-2.
3. Install shunt jumpers on J9 Pins 7-8 and Pins 9-10.
4. Install shunt jumper on J11 Pins 3-5.
5. Install shunt jumper on J13 Pins 3-5.
6. Install shunt jumper on J16 Pins 3-5 and J17 Pins 3-5. (SMBus Address = 0x5A)
7. Install shunt jumper on J18 Pins 3-5.
3. CD Mode Only: Install shunt jumper on J10 Pins 1-3.
4. EQ Mode Only: Install shunt jumper on J10 Pins 3-5.
2. Connect PC to LMH1297EVM with a USB-to-miniUSB cable through the miniUSB port located on J31.
The LMH1297's control and signal integrity settings are programmable with SigCon Architect, a GUI
which supports full register access through SMBus communication. For more information about SigCon