THS7319 Datasheet, PDF (26/34 Pages) Texas Instruments – 3-Channel, Very Low Power Video Amplifiers with EDTV Filters and 6-dB Gain

THS7319
SBOS468A – JUNE 2009 – REVISED JULY 2009.............................................................................................................................................................. www.ti.com
EVALUATION MODULE
To evaluate the THS7319, an evaluation module
(EVM) is available. The EVM allows dc-coupled input
and output configurations. Inputs and outputs include
BNC connectors commonly found in video systems
along with 75-Ω input termination resistors, 75-Ω
series source termination resistors, and 75-Ω
characteristic impedance traces. This EVM is
designed to be used with a single supply from 2.6 V
up to 5 V.
The EVM input configuration sets all channels for dc
input coupling. The input signal must be within 0 V to
approximately 1.5 V for proper operation. Failure to
be within this range saturates and/or clips the output
signal. Refer to the Application Information section for
further information.
The THS7319 incorporates an easy method to
configure the enable mode. JP1 controls the enable
feature. Connecting JP1 to GND applies 0 V to the
enable pin and the THS7319 is placed into shutdown
mode consuming nominally 0.15 µA of quiescent
current. Moving JP1 to +V_S causes the THS7319 to
be in normal operation mode where the quiescent
current should be nominally 3.4 mA for the entire
EVM. This quiescent current is with no load or no
signal applied on the input. Adding a load and/or
input signal causes the quiescent current to vary
accordingly.
Figure 57 shows the EVM schematic. Figure 58 and
Figure 59 illustrate the two layers of the EVM PCB,
incorporating standard high-speed layout practices.
Table 5 lists the bill of materials as the board comes
supplied from Texas Instruments.
J1
R1
75W
J3
R3
75W
J2
R2
75W
U1
A1
A3
A2
C2
C1
C3
B3
B1
B2
R7
1kW
1
JP1
V_S+
J7
FB1
GND
J8
C3
0.1mF
C2
0.1mF
+ C1
100mF, 10V
R4
J4
75W
R6
J6
75W
R5
J5
75W
Figure 57. THS7319 EVM Schematic
26
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