c
4
3
1
2
R
C
=
´ p ´
´
f
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Connections
19
SBOU193 – July 2017
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Copyright © 2017, Texas Instruments Incorporated
DUAL-DIYAMP-EVM
Capacitors C3 and C4 provide the option to ac couple the input to the circuit.
Equation 24
calculates the
corner frequency of the high-pass filter created by C3 and R4 and C4 and R5.
where
•
C
3
= C
4
•
R
4
= R
5
(24)
Test point VREF is used to set the dc biasing of the circuit which is typically set to one half of the supply
voltage.
Figure 28
displays the PCB layout of the top layer of the differential input to differential output circuit
configuration.
Figure 28. Differential Input to Differential Output Top Layer PCB Layout
4
Connections
This section provides a description for each connection available on the EVM.
4.1
Inputs and Outputs
The input and output connection slots were designed to fit the following connections: vertical SMA,
horizontal SMA, wires, or through-hole test points. Examples of these four connectors are shown in this
section.
The SMA recommended for this board is TE Connectivity part number 5-1814400-1.
Figure 29
shows
SMA vertical connectors attached to both the input and output terminal.
Figure 29. SMA Vertical Connectors
