Datasheet

+V
S
External
Input/Output
Pin
Internal
Circuitry
THS7364
www.ti.com SBOS530 –AUGUST 2010
APPLICATION INFORMATION
coefficient capacitors. The design of the THS7364
The THS7364 is targeted for six-channel video output
allows operation down to 2.6 V, but it is
applications that require three standard-definition
recommended to use at least a 3-V supply to ensure
(SD) video output buffers and three full-high definition
that no issues arise with headroom or clipping with
(FHD) video output buffers. Although it can be used
100% color-saturated CVBS signals. If only 75% color
for numerous other applications, the needs and
saturated CVBS is supported, then the output voltage
requirements of the video signal are the most
requirements are reduced to 2 V
PP
on the output,
important design parameters of the THS7364. Built
allowing a 2.7-V supply to be utilized without issues.
on the revolutionary, complementary Silicon
Germanium (SiGe) BiCom3X process, the THS7364 A 0.1-mF to 0.01-mF capacitor should be placed as
incorporates many features not typically found in close as possible to the power-supply pins. Failure to
integrated video parts while consuming very low do so may result in the THS7364 outputs ringing or
power. The THS7364 includes the following features: oscillating. Additionally, a large capacitor (such as
22 mF to 100 mF) should be placed on the
• Single-supply 2.7-V to 5-V operation with low total
power-supply line to minimize interference with
quiescent current of 23.4 mA at 3.3 V and
50-/60-Hz line frequencies.
24.5 mA at 5 V
• Disable mode allows for shutting down individual
INPUT VOLTAGE
SD/FHD blocks of amplifiers to save system
power in power-sensitive applications
The THS7364 input range allows for an input signal
range from –0.2 V to approximately (V
S+
– 1.5 V).
• Input configuration accepting dc + level shift, ac
However, because of the internal fixed gain of 2 V/V
sync-tip clamp, or ac-bias
(+6 dB) and the internal input level shift of 150 mV
– AC-biasing is allowed with the use of external
(typical), the output is generally the limiting factor for
pull-up resistors to the positive power supply
the allowable linear input range. For example, with a
• Sixth-order, low-pass filter for DAC reconstruction
5-V supply, the linear input range is from –0.2 V to
or ADC image rejection:
3.5 V. However, because of the gain and level shift,
– 9.5 MHz for NTSC, PAL, SECAM, composite
the linear output range limits the allowable linear
video (CVBS), S-Video Y’/C’, 480i/576i,
input range to approximately –0.1 V to 2.3 V.
Y’/P’
B
/P’
R
, and G’B’R’ (R’G’B’) signals
– 72-MHz for 1080p60 Y’/P’
B
/P’
R
or G’B’R’
INPUT OVERVOLTAGE PROTECTION
signals; also allows up to QXGA (1600 × 1200
The THS7364 is built using a very high-speed,
at 60 Hz) R'G'B' video in filter bypass mode
complementary, bipolar, and CMOS process. The
• Individually-controlled Bypass mode bypasses the
internal junction breakdown voltages are relatively
low-pass filters for each SD/FHD block of
low for these very small geometry devices. These
amplifiers
breakdowns are reflected in the Absolute Maximum
– SD bypass mode features 150-MHz and
Ratings table. All input and output device pins are
100-V/ms performance
protected with internal ESD protection diodes to the
– FHD bypass mode features 350-MHz and
power supplies, as shown in Figure 76.
500-V/ms performance
• Individually-controlled Disable mode shuts down
all amplifiers in each SD/FHD block to reduce
quiescent current to 0.1 mA
• Internally-fixed gain of 2-V/V (+6-dB) buffer that
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
Figure 76. Internal ESD Protection
OPERATING VOLTAGE
These diodes provide moderate protection to input
The THS7364 is designed to operate from 2.7 V to
overdrive voltages above and below the supplies as
5 V over the –40°C to +85°C temperature range. The
well. The protection diodes can typically support
impact on performance over the entire temperature
30 mA of continuous current when overdriven.
range is negligible as a result of the implementation
of thin film resistors and high-quality, low-temperature
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