THS7314_14 Datasheet, PDF (1/31 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
3-Channel SDTV Video Amplifier With 5^th-Order Filters and 6-dB Gain
Check for Samples: THS7314
FEATURES
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• 3 SDTV Video Amplifiers for CVBS, S-Video,
Y'P'_BP'_R 480i/576i, Y'U'V', or G'B'R' (R'G'B')
• Integrated Low-Pass Filters
– 5^th-Order 8.5-MHz (–3dB) Butterworth
– –1dB Passband Bandwidth at 7-MHz
– 47dB Attenuation at 27-MHz
• Versatile Input Biasing
– DC-Coupled With 285-mV Output Shift
– AC-Coupled with Sync-Tip Clamp
– Allows AC-Coupled With DC-Biasing
• Built-in 6dB Gain (2V/V)
• 3-V to 5-V Single Supply Operation
• Rail-to-Rail Output:
– Output Swings Within 100-mV From the
Rails Allowing AC or DC Output Coupling
– Able to Drive up to 2 Video Lines – 75 Ω
• Low 16-mA at 3.3-V Total Quiscent Current
• Low Differential Gain/Phase of 0.1% / 0.1°
• SOIC-8 Package
APPLICATIONS
• Set Top Box Output Video Buffering
• PVR/DVDR Output Buffering
• USB/Portable Low Power Video Buffering
DESCRIPTION
Fabricated using the Silicon-Germanium (SiGe)
BiCom-III process, the THS7314 is a low power
single-supply 3-V to 5-V 3-channel integrated video
buffer. It incorporates a 5th-order Butterworth filter
which is useful as a DAC reconstruction filter or an
ADC anti-aliasing filter. The 8.5-MHz filter is a perfect
choice for SDTV video which includes Composite
(CVBS), S-Video, Y'U'V', G'B'R' (R'G'B'), and Y'P'_BP'_R
480i/576i.
As part of the THS7314 flexibility, the input can be
configured for ac or dc coupled inputs. The 285-mV
output level shift to allow for a full sync dynamic
range at the output with 0-V input. The AC coupled
modes include a transparent sync-tip clamp option for
CVBS, Y', and G'B'R' signals with sync. AC-coupled
biasing for C'/P'_B/P'_R channels is achieved by adding
an external resistor to Vs+.
The THS7314 is the perfect choice for all output
buffer applications. Its rail-to-rail output stage with
6-dB gain allows for both ac and dc line driving. The
ability to drive 2-lines, or 75-Ω loads, allows for
maximum flexibility as a video line driver. The 16-mA
total quiescent current at 3.3-V makes it an excellent
choice for USB powered, portable, or other power
sensitive video applications.
The THS7314 is available in a small SOIC-8 package
that is RoHS compliant.
3.3 V
DAC/
CVBS
Encoder
(THS8200)
R
SDTV
CVBS
Y’
S-Video Y’
S-Video C’
R
480i/576i
Y’P’_BP’_R
G’B’R’
C’
R
THS7314
1 CH.1 IN
2 CH.2 IN
3 CH.3 IN
4 ^VS+
CH.1 OUT 8
CH.2 OUT 7
CH.3 OUT 6
GND 5
3.3 V
CVBS
Out
75 W
75 W
Y’
Out
S-Video
75 W
75 W
C’
75 W
Out
75 W
Figure 1. 3.3-V Single-Supply DC-Input/DC Output Coupled Video Line Driver
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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