Datasheet

THS7360
www.ti.com SLOS674 –JUNE 2010
EVALUATION MODULE
C26, C28, and/or C30) with 0-Ω resistors works well.
To evaluate the THS7360, an evaluation module
Removing the 470-mF capacitors is optional, but
(EVM) is available. The THS7360EVM allows for
removing them from the EVM eliminates a few
testing the THS7360 in many different configurations.
picofarads of stray capacitance on each signal path
Inputs and outputs include BNC connectors and RCA
which may be desirable.
connectors commonly found in video systems, along
with 75-Ω input termination resistors, 75-Ω series The THS7360 incorporates an easy method to
source termination resistors, and 75-Ω characteristic configure the bypass modes and the disable modes.
impedance traces. Several unpopulated component The use of JP4 controls the SD channels disable
pads are found on the EVM to allow for different input feature; JP6 controls the SF channels disable feature;
and output configurations as dictated by the user. JP3 controls the SD channels filter/bypass mode; and
This EVM is designed to be used with a single supply JP5 controls the SF channels filter/bypass mode.
from 2.6 V up to 5 V.
Connection of JP4 and JP6 to GND applies 0 V to the
The EVM default input configuration sets all channels disable pins and the THS7360 operates normally.
for dc input coupling. The input signal must be within Moving JP4 to +V
S
causes the THS7360 SD
0 V to approximately 0.65 V for proper operation. channels to be in disable mode, while moving JP6 to
Failure to be within this range saturates and/or clips +V
S
causes the THS7360 SF channels to be in
the output signal. If the input range is beyond this, if disable mode.
the signal voltage is unknown, or if coming from a
Connection of JP3 to GND places the THS7360 SD
current sink DAC, then ac input configuration is
channels in filter mode while moving JP3 to +V
S
desired. This option is easily accomplished with the
places the THS7360 SD channels in bypass mode.
EVM by simply replacing the Z
1
through Z
6
0-Ω
Connection of JP5 to GND places the THS7360 SF
resistors with 0.1-mF capacitors.
channels in filter mode while moving JP5 to +V
S
For an ac-coupled input and sync-tip clamp (STC) places the THS7360 SF channels in bypass mode.
functionality commonly used for CVBS, s-video Y',
The filter selection is also easily accomplished by
component Y' signals, and R'G'B' signals, no other
using jumpers JP1 and JP2. JP1 controls the logic
changes are needed. However, if a bias voltage is
voltage for the filter 1 pin while JP2 controls the logic
needed after the input capacitor which is commonly
voltage for the filter 2 pin. Table 1 and Table 2 show
needed for s-video C', component P'
B,
and P'
R
, then a
the truth table for the filter selection and the
pull-up resistor should be added to the signal on the
appropriate logic for 3.3-V and 5-V operation,
EVM. This configuration is easily achieved by simply
respectively. The EVM also has a truth table printed
adding a resistor to any of the following resistor pads;
on it for easy reference.
RX7 to RX12. A common value to use is 10 MΩ.
Note that even signals with embedded sync can also
Figure 49 shows the THS7360EVM schematic.
use bias mode if desired.
Figure 51 and Figure 52 illustrate the two layers of
the EVM PCB, incorporating standard high-speed
The EVM default output configuration sets all
layout practices. Table 7 lists the bill of materials as
channels for ac output coupling. The 470-mF and
the board comes supplied from Texas Instruments.
0.1-mF capacitors work well for most ac-coupled
systems. However, if dc-coupled output is desired,
then replacing the 0.1-mF capacitors (C20, C22, C24,
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