THS7373 Datasheet, PDF (30/49 Pages) Texas Instruments – 4-Channel Video Amplifier with 1-SD and 3-HD Sixth-Order Filters and 6-dB Gain

THS7373
SBOS506 – DECEMBER 2009
www.ti.com
APPLICATION INFORMATION
The THS7373 is targeted for systems that require a
single standard-definition (CVBS) video output for
CVBS video support along with three high-definition
(HD) video outputs. 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 THS7373. Built
on the revolutionary, complementary Silicon
Germanium (SiGe) BiCom3X process, the THS7373
incorporates many features not typically found in
integrated video parts while consuming very low
power. The THS7373 includes the following features:
• Single-supply 3-V to 5-V operation with low total
quiescent current of 16.2 mA at 3.3 V and 16.9
mA at 5 V
• Disable mode allows for shutting down the
THS7373 to save system power in
power-sensitive applications
• Input configuration accepting dc + level shift, ac
sync-tip clamp, or ac-bias:
– Reduces quiescent current to as low as 0.1 µA
• Flexible input configurations allows for dc + level
shift, ac sync-tip clamp, or ac-biasing:
– AC-biasing is configured by use of an external
pull-up resistor to the positive power supply
• Sixth-order, low-pass filter for DAC reconstruction
or ADC image rejection:
– 9.5 MHz for NTSC, PAL, or SECAM composite
video baseband signal (CVBS)
– 36 MHz for 720p, 1080i, or up to 1080p30
Y’/P’_B/P’_R or G’B’R’ signals
• HD bypass mode bypasses the HD low-pass
filters for all three channels:
– HD channels can support 1080p60 or QXGA
video with 350-MHz and 450-V/µs
performance
• Internal fixed gain of 2 V/V (+6 dB)
• Supports driving two video lines per channel with
dc-coupling or traditional ac-coupling
• Flow-through configuration using a TSSOP-14
package that complies with the latest lead-free
(RoHS-compatible) and green manufacturing
requirements
coefficient capacitors. The design of the THS7373
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.
A 0.1-μF capacitor should be placed as close as
possible to the power-supply pins to avoid potential
ringing or oscillations. Additionally, a large capacitor
(such as 22 μF to 100 μF) should be placed on the
power-supply line to minimize interference with
50-/60-Hz line frequencies.
INPUT VOLTAGE
The THS7373 input range allows for an input signal
range from –0.4 V to approximately (V_S+ – 1.5 V).
However, because of the internal fixed gain of 2 V/V
(+6 dB) and the internal output level shift of 300 mV,
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 –0.4 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.
INPUT OVERVOLTAGE PROTECTION
The THS7373 is built using a very high-speed,
complementary, bipolar, and CMOS process. The
internal junction breakdown voltages are relatively
low for these very small geometry devices. These
breakdowns are reflected in the Absolute Maximum
Ratings table. All input and output device pins are
protected with internal ESD protection diodes to the
power supplies, as shown in Figure 97.
These diodes provide moderate protection to input
overdrive voltages above and below the supplies as
well. The protection diodes can typically support
30 mA of continuous current when overdriven.
+V_S
External
Input/Output
Pin
Internal
Circuitry
OPERATING VOLTAGE
The THS7373 is designed to operate from 3 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
Figure 97. Internal ESD Protection
30
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