THS7314_17 Datasheet, PDF (11/31 Pages) Texas Instruments – 3-Channel SDTV Video Amplifier With 5th-Order Filters and 6-dB Gain

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THS7314
SLOS513A – DECEMBER 2006 – REVISED MARCH 2011
APPLICATION INFORMATION
The THS7314 is targeted for standard definition video output buffer applications. Although it can be used for
numerous other applications, the needs and requirements of the video signal is an important design parameter of
the THS7314. Built on the Silicon Germanium (SiGe) BiCom-3 process, the THS7314 incorporates many
features not typically found in integrated video parts while consuming very low power.
The THS7314 has the following features:
• Single-Supply 3-V to 5-V operation with low total quiescent current of 16-mA at 3.3-V and 17-mA at 5-V.
• Input configuration accepting DC + Level shift, AC Sync-Tip Clamp, or AC-Bias.
• AC-Biasing is accomplished with the use of external pull-up resistor to the positive power supply.
• 5^th-Order Low Pass Filter for DAC reconstruction or ADC image rejection:
– 8.5-MHz for NTSC, PAL, SECAM, Composite (CVBS), S-Video Y'C', 480i/576i Y'P'_BP'_R , and G'B'R'
(R'G'B') signals.
• Internal fixed gain of 2 V/V (6 dB) buffer that can drive up to 2 video lines with dc coupling or traditional ac
coupling.
• Signal flow-through configuration using an 8-pin SOIC package that complies with the latest lead-free (RoHS
compatible) and Green manufacturing requirements.
OPERATING VOLTAGE
The THS7314 is designed to operate from 3-V to 5-V over a –40°C to 85°C temperature range. The impact on
performance over the entire temperature range is negligible due to the implementation of thin film resistors and
high quality – low temperature coefficient capacitors. The design of the THS7314 allows operation down to
2.85-V, but for best results the use of a 3-V supply or greater should be used to ensure there are no issues with
headroom or clipping.
The power supply pins should have a 0.1 μF to 0.01 μF capacitor placed as close as possible to these pins.
Failure to do so may result in the THS7314 outputs ringing or have an oscillation. 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 THS7314 input range allows for an input signal range from –0.2V to about (V_s+ – 1.5V). But, due to the
internal fixed gain of 2 V/V (6 dB) and the internal level shift of nominally 145-mV, the output will generally be the
limiting factor for the allowable linear input range. For example, with a 5-V supply, the linear input range is
from –0.2V to 3.5V. But due to the gain and level shift, the linear output range limits the allowable linear input
range to be from about –0.1V to 2.3V .
INPUT OVERVOLTAGE PROTECTION
The THS7314 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 28.
© 2006–2011, Texas Instruments Incorporated
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