Texas Instruments THS7303EVM Evaluation Module THS7303EVM THS7303EVM Datenbogen
Produktcode
THS7303EVM
SLOS479B
–
OCTOBER 2005
–
REVISED MARCH 2011
APPLICATION INFORMATION
The THS7303 is targeted for video output buffer applications. Although it can be used for numerous other
applications, the needs and requirements of the video signal are the most important design parameters of the
THS7303. Built on the complementary silicon germanium (SiGe) BiCom-3 process, the THS7303 incorporates
many features not typically found in integrated video parts while consuming low power. Each channel
configuration is completely independent of the other channels. This allows for configurations for each channel to
be dictated by the end user and not the device. This results in a highly flexible system for most video systems.
The THS7303 contains the following features:
applications, the needs and requirements of the video signal are the most important design parameters of the
THS7303. Built on the complementary silicon germanium (SiGe) BiCom-3 process, the THS7303 incorporates
many features not typically found in integrated video parts while consuming low power. Each channel
configuration is completely independent of the other channels. This allows for configurations for each channel to
be dictated by the end user and not the device. This results in a highly flexible system for most video systems.
The THS7303 contains the following features:
•
I
2
C Interface for easy interfacing to the system.
•
Single-supply 2.7-V to 5-V operation with low total quiescent current of 16.6 mA with 3.3-V supply and 18.9
mA with 5-V supply.
mA with 5-V supply.
•
2:1 input MUX.
•
Input configuration accepting dc, dc + 135 mV shift, ac bias, or ac sync-tip-clamp selection.
•
Selectable fifth-order, low-pass filter for DAC reconstruction or ADC image rejection :
–
9-MHz for SDTV NTSC and 480i, PAL/SECAM and 576i, S-Video, and G'B'R' (R'G'B') signals.
–
16-MHz for EDTV 480p and 576p Y
’
P
’
B
P
’
R
signals, G
’
B
’
R
’
, and VGA signals.
–
35-MHz for HDTV 720p and 1080i Y
’
P
’
B
P
’
R
signals, G
’
B
’
R
’
, and SVGA/XGA signals.
–
Bypass mode for passing HDTV 1080p Y
’
P
’
B
P
’
R
, G
’
B
’
R
’
, and SXGA/UXGA signals.
•
Internal fixed gain of 2 V/V (6 dB) buffer that can drive two video lines per channel with dc coupling,
traditional ac coupling, or SAG corrected ac coupling.
traditional ac coupling, or SAG corrected ac coupling.
•
Disable mode that reduces quiescent current to as low as 0.1-
μ
A or a mute function that keeps the THS7303
powered on, but does not allow a signal to pass through.
•
Signal flow-through configuration using a 20-pin TSSOP package that complies with the latest lead-free
(RoHS compatible) and green manufacturing requirements.
(RoHS compatible) and green manufacturing requirements.
OPERATING VOLTAGE
The THS7303 is designed to operate from 2.7 V to 5 V over a
–
40
°
C to +85
°
C temperature range. The impact on
performance over the entire temperature range is negligible due to the implementation of thin film resistors and
low-temperature coefficient capacitors.
low-temperature coefficient capacitors.
The power supply pins should have a 0.1-
μ
F to 0.01-
μ
F capacitor placed as close as possible to these pins.
Failure to do so may result in the THS7303 outputs ringing or oscillating. Additionally, a large capacitor, such as
22
22
μ
F to 100
μ
F, should be placed on the power-supply line to minimize issues with 50/60 Hz line frequencies.
INPUT VOLTAGE
The THS7303 input range allows for an input signal range from ground to (V
S+
–
1.4 V). However, as a result of
the internal fixed gain of 2 V/V (6 dB), the output is the limiting factor for the allowable linear input range. For
example, with a 5-V supply, the linear input range is from GND to 3.6 V. Because of the gain, the linear output
range limits the allowable linear input range to be from GND up to 2.5 V.
example, with a 5-V supply, the linear input range is from GND to 3.6 V. Because of the gain, the linear output
range limits the allowable linear input range to be from GND up to 2.5 V.
Copyright
©
2005
–
2011, Texas Instruments Incorporated
21
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