Datasheet
APPLICATION INFORMATION
INPUT VOLTAGE
INPUT OVERVOLTAGE PROTECTION
+V
S
External
Input/Output
Pin
Internal
Circuitry
OPERATING VOLTAGE
THS7365
SBOS467 – MARCH 2009 ..................................................................................................................................................................................................
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allows operation down to 2.6 V, but it is
The THS7365 is targeted for six-channel video output
recommended to use at least a 3-V supply to ensure
applications that require three standard-definition
that no issues arise with headroom or clipping with
(SD) video output buffers and three high-definition
100% color-saturated CVBS signals. If only 75% color
(HD) output buffers. Although it can be used for
saturated CVBS is supported, then the output voltage
numerous other applications, the needs and
requirements are reduced to 2 V
PP
on the output,
requirements of the video signal are the most
allowing a 2.7-V supply to be utilized without issues.
important design parameters of the THS7365. Built
on the revolutionary, complementary Silicon A 0.1- µ F to 0.01- µ F capacitor should be placed as
Germanium (SiGe) BiCom3X process, the THS7365 close as possible to the power-supply pins. Failure to
incorporates many features not typically found in do so may result in the THS7365 outputs ringing or
integrated video parts while consuming very low oscillating. Additionally, a large capacitor (such as
power. The THS7365 includes the following features: 22 µ F to 100 µ F) should be placed on the
power-supply line to minimize interference with
• Single-supply 2.7-V to 5-V operation with low total
50-/60-Hz line frequencies.
quiescent current of 20.7 mA at 3.3 V and 21.6
mA at 5 V
• Disable mode allows for shutting down individual
SD/HD blocks of amplifiers to save system power
The THS7365 input range allows for an input signal
in power-sensitive applications
range from – 0.2 V to approximately (V
S+
– 1.5 V).
However, because of the internal fixed gain of 2 V/V
• Input configuration accepting dc + level shift, ac
(+6 dB) and the internal input level shift of 150 mV
sync-tip clamp, or ac-bias
(typical), the output is generally the limiting factor for
– AC-biasing is allowed with the use of external
the allowable linear input range. For example, with a
pull-up resistors to the positive power supply
5-V supply, the linear input range is from – 0.2 V to
• Sixth-order, low-pass filter for DAC reconstruction
3.5 V. However, because of the gain and level shift,
or ADC image rejection:
the linear output range limits the allowable linear
– 9.5 MHz for NTSC, PAL, SECAM, composite
input range to approximately – 0.1 V to 2.3 V.
video (CVBS), S-Video Y ’ /C ’ , 480i/576i,
Y ’ /P ’
B
/P ’
R
, and G ’ B ’ R ’ (R ’ G ’ B ’ ) signals
– 36 MHz for 720p, 1080i, or up to 1080p30
The THS7365 is built using a very high-speed,
Y ’ /P ’
B
/P ’
R
or G ’ B ’ R ’ signals; also allows up to
complementary, bipolar, and CMOS process. The
XGA (1024 × 768 at 60 Hz) R'G'B' video
internal junction breakdown voltages are relatively
• Individually-controlled Bypass mode bypasses the
low for these very small geometry devices. These
low-pass filters for each SD/HD block of amplifiers
breakdowns are reflected in the Absolute Maximum
– SD bypass mode features 130-MHz and
Ratings table. All input and output device pins are
100-V/ µ s performance
protected with internal ESD protection diodes to the
– HD bypass mode features 250-MHz and
power supplies, as shown in Figure 115 .
500-V/ µ s performance
• Individually-controlled Disable mode shuts down
all amplifiers in each SD/HD block to reduce
quiescent current to less than 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
• Flow-through configuration using a TSSOP-20
package that complies with the latest lead-free
(RoHS-compatible) and green manufacturing
requirements
Figure 115. Internal ESD Protection
These diodes provide moderate protection to input
The THS7365 is designed to operate from 2.7 V to
overdrive voltages above and below the supplies as
5 V over a – 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
coefficient capacitors. The design of the THS7365
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