THS7303 Datasheet, PDF (1/43 Pages) Texas Instruments – 3-Channel Low Power Video Amplifier with I2C Control, Selectable Filters, 6-dB Gain, SAG Correction, 2:1 Input MUX, and Selectable Input Bias Modes

THS7303
www.ti.com
SLOS479 – OCTOBER 2005
3-Channel Low Power Video Amplifier with I²C Control, Selectable Filters, 6-dB Gain,
SAG Correction, 2:1 Input MUX, and Selectable Input Bias Modes
FEATURES
• 3-Video Amplifiers for CVBS, S-Video™,
Y'U'V', SD/ED/HD Y'P'_BP'_R, and G'B'R' (R'G'B')
• I²C™ Control of All Functions
• Integrated Low-Pass Filters
– Fifth Order Butterworth Characteristics
– Selectable Corner Frequencies of 9-MHz,
16-MHz, 35-MHz, and Bypass (190-MHz)
• Selectable Input Bias Modes
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Bias
– DC-Coupled with 135-mV Input Shift
– DC-Coupled
• 2:1 Input MUX Allows Multiple Input Sources
• Built-in 6-dB Gain (2V/V)
• SAG Correction Capable
• 2.7-V to 5-V Single Supply Operation
• Low 16.6-mA (3.3V) Total Quiscent Current
• Individual Disable (0.1 µA) and Mute Control
• Rail-to-Rail Output:
– Output Swings within 100 mV from the Rails
Which Allows AC or DC Output Coupling
– Able to Drive up to 2 Video Lines – 75 Ω
• Low Differential Gain/Phase of:
0.13% / 0.55° at 3.3V
APPLICATIONS
• Set Top Box Output Video Buffering
• PVR/DVDR Output Buffering
• USB/Portable Low Power Video Buffering
DESCRIPTION
Fabricated using the new complimentary
silicon-germanium (SiGe) BiCom-III process, the
THS7303 is a low-power, single-supply 2.7-V to 5-V,
3-channel integrated video buffer. It incorporates a
selectable 5^th order Butterworth filter to eliminate data
converter images. The 9-MHz is a perfect choice for
SDTV video including composite (CVBS), S-Video,
and 480i/576i Y'P'_BP'_R, and G'B'R' (R'G'B') signals.
The 16-MHz filter is ideal for EDTV 480p/576p
Y'P'_BP'_R, G'B'R', and VGA signals. The 35-MHz filter
is useful for HDTV 720p/1080i Y'P'_BP'_R, G'B'R', and
SVGA/XGA signals. For 1080p or SXGA/UXGA
signals, the filter can be bypassed allowing a
190-MHz bandwidth, 300-V/µs amplifier to buffer the
signal.
Each channel of the THS7303 is individually I²C
configurable for all functions which makes it flexible
for any application. Its rail-to-rail output stage allows
for both ac and dc coupling applications. The 6-dB
gain along with the built-in SAG correction allows for
maximum flexibility as an output video buffer.
The 16.6-mA total quiescent current (55 mW total
power) makes the THS7303 an excellent choice for
USB powered or portable video applications. While
fully disabled, the THS7303 consumes only 0.1 µA
making it ideal for energy sensitive applications.
3.3 V
Video
DAC /
Encoder
External
Input
In A
In B
R
75 W
Bypass
2:1
DC
135 mV
X1
DC
AC -
BIAS
AC
Sync
TIP
Clamp
MUTE
LPF
9 / 16 /
35-MHz
1 kW
+
-
878 W
47 mF
Out
675 W
SAG
150 W
33 mF
SDA SCL I2C-A1
I2C-A0
3.3 V
75 W
Video
Out
75 W
Figure 1. 3.3 V Single-Supply DC-Input/AC-Video Output System w/SAG Correction
(1 of 3 Channels Shown)
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.
I²C is a trademark of Philips Electronics.
S-Video is a trademark of its respective owner.
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 © 2005, Texas Instruments Incorporated