THS7360 Datasheet, PDF (22/41 Pages) Texas Instruments – 6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and High Gain

THS7360
SLOS674 – JUNE 2010
www.ti.com
APPLICATION INFORMATION
The THS7360 is targeted for six-channel video output
applications that require three standard-definition
(SD) video output buffers and three selectable filter
(SF) 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 THS7360. Built
on the revolutionary, complementary Silicon
Germanium (SiGe) BiCom3X process, the THS7360
incorporates many features not typically found in
integrated video parts while consuming very low
power. The THS7360 includes the following features:
• Single-supply 2.7-V to 5-V operation with low total
quiescent current of 24.5 mA at 3.3 V and
25.5 mA at 5 V
• Disable mode allows for shutting down individual
SD/SF blocks of amplifiers to save system power
in power-sensitive applications
• Input configuration accepts 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, composite
video (CVBS), S-Video Y’/C’, 480i/576i,
Y’/P’_B/P’_R, and G’B’R’ (R’G’B’) signals
– Selectable 9.2-MHz/17-MHz/35-MHz/70-MHz
for
480i/576i,
480p/576p,
720p/1080i/1080p24/1080p30, or 1080p60
Y’/P’ _B/P’_R or G’B’R’ signals; also allows up to
QXGA (1600 × 1200 at 60 Hz) R'G'B' video
• Individually-controlled Bypass mode bypasses the
low-pass filters for each SD/SF block of amplifiers
– SD bypass mode features 60-MHz and
150-V/ms performance
– SF bypass mode features 280-MHz and
800-V/ms performance
• Individually-controlled Disable mode shuts down
all amplifiers in each SD/SF block to reduce
quiescent current to 0.1 mA
• Internally-fixed gain of 5.6-V/V (+15-dB) for SD
channels or 4.5-V/V (+13.1-dB) for SF channels
• All outputs can drive two video lines with
dc-coupling or traditional ac-coupling
• Flow-through configuration using a TSSOP-20
package that complies with the latest lead-free
(RoHS-compatible) and green manufacturing
requirements
OPERATING VOLTAGE
The THS7360 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 THS7360
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-mF to 0.01-mF capacitor should be placed as
close as possible to the power-supply pins. Failure to
do so may result in the THS7360 outputs ringing or
oscillating. Additionally, a large capacitor (such as
22 mF to 100 mF) should be placed on the
power-supply line to minimize interference with
50-/60-Hz line frequencies.
INPUT VOLTAGE
The THS7360 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
5.6 V/V (+15 dB) on the SD channels or 4.5 V/V
(+13.1dB) and the internal input level shift of 120 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 –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 –0.08 V to 0.8 V.
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