THS7315_14 Datasheet, PDF (1/28 Pages) Texas Instruments – 3-Channel SDTV Video Amplifier with 5th-Order Filters and 5.2-V/V Gain

THS7315
www.ti.com
SLOS532 – JUNE 2007
3-Channel SDTV Video Amplifier with 5th-Order Filters and 5.2-V/V Gain
FEATURES
• Three 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:
– 5th-Order, 8.5-MHz (–3dB) Butterworth
– –1dB Passband Bandwidth at 7 MHz
– 47 dB Attenuation at 27 MHz
• Versatile Input Biasing:
– DC-Coupled with 230-mV Output Shift
– AC-Coupled with Sync-Tip Clamp
– Allows AC-Coupled With DC-Biasing
• Built-in 5.2 V/V Gain (14.3 dB)
• +3-V to +5-V Single Supply Operation
• Rail-to-Rail Output:
– Output Swings Within 100 mV of the Rails,
Allowing AC- or DC-Output Coupling
– Supports Driving Two Lines per Channel
• Low Total Quiescent Current: 15.6 mA at 3.3 V
• Low Differential Gain/Phase of 0.2%/0.3°
• Lead-free, Green SOIC-8 Package
APPLICATIONS
• Set Top Box Output Video Buffering
• PVR/DVDR Output Buffering
• USB/Portable Low-Power Video Buffering
DESCRIPTION
Fabricated using the revolutionary complementary
silicon-sermanium (SiGe) BiCom3 process, the
THS7315 is a low-power, single-supply, 3-V to 5-V
3-channel integrated video buffer. It incorporates a
5th-order Butterworth filter that is useful as a
digital-to-analog converter (DAC) reconstruction filter
or an analog-to-digital converter (ADC) anti-aliasing
filter. The 8.5-MHz filter is a perfect choice for SDTV
video, including Composite Video Baseband Signals
(CVBS), S-Video, Y’U’V’, G’B’R’ (R’G’B’), and
Y’P’_BP’_R 480i/576i.
The THS7315 inputs can be either ac- or dc-coupled.
The 230-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
bottom-level sync. AC-coupled biasing for C'/P'_B/P'_R
channels can easily be achieved by adding an
external resistor to V_S+.
The THS7315 is the perfect choice for all output
buffer applications. Its rail-to-rail output stage with
5.2-V/V gain allows for both ac and dc line driving,
making it a perfect choice for DaVinci™ processors.
The ability for each channel to drive two video lines,
or 75-Ω loading, allows for maximum flexibility as a
video line driver. The 15.6-mA quiescent current at
3.3 V also makes it an excellent choice for
USB-powered, portable, or other power-sensitive
video applications
The THS7315 is available in a small SOIC-8
package that is lead-free and compliant with green
requirements.
+1.8 V
DAC/
Encoder
TM
(DaVinci )
SDTV
CVBS
S-Video Y’
S-Video C’
480i/576i
Y’P’_BP’_R
G’B’R’
CVBS
Y’
C’
500 W
500 W
500 W
THS7315
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
Gain =
5.2 V/V
CVBS
OUT
75 W
75 W
S-Video
Y’
OUT
75 W
75 W
C’
OUT
75 W
75 W
3.3-V Single-Supply DC-Input/DC-Output Coupled Video Line Driver
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
DaVinci is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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.
Copyright © 2007, Texas Instruments Incorporated