SH1
SH3
SH2
SH4
LSF
0204
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Setup
7
SLVUB53 – July 2017
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Copyright © 2017, Texas Instruments Incorporated
LSF-EVM Hardware User's Guide
3.2
LSF0204 Setup
Figure 9
shows a typical setup of the LSF-EVM with the LSF0204 device populated. Note the following
connections:
•
VREF_A is connected to J1
•
V_PU is connected to J2
•
A high-speed signal can be connected into the SMA Connector on the A side with a 50-
Ω
termination
impedance to reduce line reflections
•
An SMA cable is connected from the B side to a high-impedance oscilloscope input to monitor the
output waveform
•
Four red boxes indicate the positions for shunt jumpers, refer to the following descriptions:
–
SH1: This shunt jumper is populated to pull up the B3 line to up translate the signal from the A side
–
SH2: This shunt jumper is populated to pull up the B1 line to up translate the signal from the A side
–
SH3: This shunt jumper is populated to short/bypass the R7 200-k
Ω
resistor. This resistor is not
required for operation with the LSF0204 devices, as the 200-k
Ω
resistor is integrated.
–
SH4: This shunt jumper is populated to connect the EN pin of the LSF0204 to VREF_A to enable
the device. For the LSF0204D device, this shunt/jumper should be connected to GND to enable the
device (shifting the shunt/jumper up one position pulls this line to ground).
Figure 9. LSF0204 Board Setup
3.3
Operating Modes
There are two operating modes of the LSF-EVM: dual-supply operation and single-supply operation.
3.3.1
Dual Supply Operation (Typical operating mode)
This is the typical mode of operation for this EVM. Two supplies are used as shown in
Figure 8
. With two
supplies connected, the device is able to up or down translate bidirectionally between the A and B side
when the corresponding pullup resistors are connected.