Texas Instruments THS7372 Evaluation Module THS7372PWEVM THS7372PWEVM 데이터 시트
제품 코드
THS7372PWEVM
SBOS578
–
AUGUST 2011
APPLICATION INFORMATION
The THS7372 is targeted for four-channel video output applications that require one standard-definition (SD)
video output buffer and three full-high definition (FHD) video output buffers. 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 THS7372. Built on the revolutionary, complementary Silicon Germanium (SiGe) BiCom3X
process, the THS7372 incorporates many features not typically found in integrated video parts while consuming
very low power. The THS7372 includes the following features:
video output buffer and three full-high definition (FHD) video output buffers. 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 THS7372. Built on the revolutionary, complementary Silicon Germanium (SiGe) BiCom3X
process, the THS7372 incorporates many features not typically found in integrated video parts while consuming
very low power. The THS7372 includes the following features:
•
Single-supply 2.7-V to 5-V operation with low total quiescent current of 23.4 mA at 3.3 V and
24.5 mA at 5 V
24.5 mA at 5 V
•
Disable mode allows for shutting down individual SD/FHD blocks of amplifiers to save system power in
power-sensitive applications
power-sensitive applications
•
Input configuration accepting dc + level shift, ac sync-tip clamp, or ac-bias
–
AC-biasing is allowed with the use of external pull-up resistors to the positive power supply
•
Sixth-order, low-pass filter for DAC reconstruction or ADC image rejection:
–
9.5 MHz for NTSC, PAL, SECAM, and composite video (CVBS) signals
–
72 MHz for 1080p60 Y
’
/P
’
B
/P
’
R
or G
’
B
’
R
’
signals
•
Individually-controlled Disable mode shuts down all amplifiers in each SD/FHD block to reduce quiescent
current to 0.1
current to 0.1
μ
A
•
Internally-fixed gain of 2-V/V (+6-dB) buffer that can drive two video lines with dc-coupling or traditional
ac-coupling
ac-coupling
•
Flow-through
configuration
using
a
TSSOP-14
package
that
complies
with
the
latest
lead-free
(RoHS-compatible) and green manufacturing requirements
OPERATING VOLTAGE
The THS7372 is designed to operate from 2.7 V to 5 V over the
–
40
°
C to +85
°
C temperature range. The impact
on performance over the entire temperature range is negligible as a result of the implementation of thin film
resistors and high-quality, low-temperature coefficient capacitors. The design of the THS7372 allows operation
down to 2.6 V, but it is recommended to use at least a 3-V supply to ensure that no issues arise with headroom
or clipping with 100% color-saturated CVBS signals. If only 75% color saturated CVBS is supported, then the
output voltage requirements are reduced to 2 V
resistors and high-quality, low-temperature coefficient capacitors. The design of the THS7372 allows operation
down to 2.6 V, but it is recommended to use at least a 3-V supply to ensure that no issues arise with headroom
or clipping with 100% color-saturated CVBS signals. If only 75% color saturated CVBS is supported, then the
output voltage requirements are reduced to 2 V
PP
on the output, allowing a 2.7-V supply to be utilized without
issues.
A 0.1-
μ
F to 0.01-
μ
F capacitor should be placed as close as possible to the power-supply pins. Failure to do so
may result in the THS7372 outputs ringing or oscillating. Additionally, a large capacitor (such as 22
μ
F to 100
μ
F)
should be placed on the power-supply line to minimize interference with 50-/60-Hz line frequencies.
INPUT VOLTAGE
The THS7372 input range allows for an input signal range from
–
0.2 V to approximately (V
S+
–
1.5 V). However,
because of the internal fixed gain of 2 V/V (+6 dB) and the internal input level shift of 150 mV (typical), the output
is generally the limiting factor for the allowable linear input range. For example, with a 5-V supply, the linear input
range is from
is generally the limiting factor for the allowable linear input range. For example, with a 5-V supply, the linear input
range is from
–
0.2 V to 3.5 V. However, because of the gain and level shift, the linear output range limits the
allowable linear input range to approximately
–
0.1 V to 2.3 V.
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Copyright
©
2011, Texas Instruments Incorporated