THS7374_16 Datasheet, PDF (1/42 Pages) Texas Instruments – 4-Channel SDTV Video Amplifier with 6th-Order Filters and 6-dB Gain

THS7374
THS7374
www.ti.com
SLOS590B – JULY 2008 – REVISED JANUARY 2011
4-Channel SDTV Video Amplifier with 6th-Order Filters and 6-dB Gain
Check for Samples: THS7374
FEATURES
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•2 4-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:
– 6th-Order 9.5-MHz (–3 dB) Butterworth
– –1 dB Passband Bandwidth at 8.2-MHz
– 54-dB Attenuation at 27-MHz
• 150-MHz (–3 dB) Filter Bypass Mode
• Versatile Input Biasing
– DC-Coupled with 300-mV Output Shift
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Biasing Allowed
• Built-in 6-dB Gain (2 V/V)
• +3-V to +5-V Single-Supply Operation
• Rail-to-Rail Output:
– Output Swings Within 100 mV from the
Rails to Allow AC or DC Output Coupling
– Supports Driving 2 Lines per Channel
• Low 9.6-mA at 3.3-V Total Quiescent Current
• 0.1-mA Disabled Supply Current Function
• Low Differential Gain/Phase of 0.15%/0.3°
• Lead-Free and Green TSSOP-14 Package
APPLICATIONS
• Low-Cost SCART Systems
• Set Top Box Output Video Buffering
• Surveillance Systems
DESCRIPTION
Fabricated using the revolutionary complementary
Silicon-Germanium (SiGe) BiCom3X process, the
THS7374 is a low-power, single-supply 3 V to 5 V
four-channel integrated video buffer. It incorporates a
sixth-order Butterworth filter (able to be bypassed)
which is useful as a digital-to-analog converter (DAC)
reconstruction filter or an analog-to-digital converter
(ADC) anti-aliasing filter. The 9.5-MHz filter is a
perfect choice for SDTV video that 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 THS7374 flexibility, the input can be
configured for either ac or dc-coupled inputs. The
300-mV output level shift allows 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 can
easily be achieved by adding an external resistor.
The THS7374 is the perfect choice for all video buffer
applications. Its rail-to-rail output stage with 6-dB gain
allows for both ac and dc line driving. The ability to
drive two lines per channel, or 75-Ω loads, allows for
maximum flexibility as a video line driver. The 9.6-mA
total quiescent current at 3.3 V and 0.1-mA disabled
current makes it an excellent choice for portable or
other power-sensitive applications.
The THS7374 is available in a TSSOP-14 package
that is lead-free and green (RoHS) compliant.
+3.3 V
CVBS
R
DAC/Encoder
Y'/G'
SDTV
R
CVBS
S-Video
Y'P’_BP'_R
R'G'B’
P’_B/B'
R
P’_R/R'
R
THS7374
1 CH1 IN CH1 OUT 14
2 CH2 IN CH2 OUT 13
3 CH3 IN CH3 OUT 12
4 CH4 IN CH4 OUT 11
5 GND
V_S+ 10
6 DISABLE BYPASS 9
7 NC
NC 8
CVBS/Sync
75 W
Y'/G' Out
75 W
P'_B/B' Out
75 W
To GPIO Controller
or GND
+3 V to +5 V
P'_R/R' Out
75 W
75 W
75 W
75 W
75 W
Figure 1. 3.3-V Single-Supply, DC-Input/DC-Output Coupled Video Line Driver
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PRODUCTION DATA information is current as of publication date.
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Instruments standard warranty. Production processing does not
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