THS7353 Datasheet, PDF (1/51 Pages) Texas Instruments – 3-Channel Low Power Video Buffer with I2C Control, Selectable Filters, External Gain Control, 2:1 Input MUX, and Selectable Input Modes

THS7353
www.ti.com
SLOS484 – NOVEMBER 2005
3-Channel Low Power Video Buffer with I²C Control, Selectable Filters, External Gain
Control, 2:1 Input MUX, and Selectable Input Modes
FEATURES
• 3-Video Buffers for CVBS, S-Video, SD/ED/HD
Y'P'_BP'_R, and G'B'R' (R'G'B') Video
• I²C™ Control of All Functions
• Integrated Low-Pass Filters
– 5^th Order Butterworth Characteristics
– Selectable Corner Frequencies of 9-MHz,
16-MHz, 35-MHz, and Bypass (150-MHz)
• Selectable Input Bias Modes
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Bias
– DC-Coupled with 250-mV Input Shift
– DC-Coupled
• 2:1 Input MUX Allows Multiple Input Sources
• External Gain Control Range From
0 dB to 14 dB
• 2.7-V to 5-V Single Supply Operation
• Low 16.2-mA (3.3 V) Total Quiscent Current
• Disable (< 1 µA) and Mute Control Functions
• Rail-to-Rail Output:
– Allows AC or DC Output Coupling
• Low Differential Gain/Phase of 0.15%/0.3°
APPLICATIONS
• HDTV Video Buffering
• PVR/DVDR Video Buffering
• Projector Video Buffering
• USB/Portable Low Power Video Buffering
DESCRIPTION
Fabricated using the new complimentary
silicon-germanium (SiGe) BiCom-III process, the
THS7353 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 anti-aliasing / DAC
reconstruction filter to eliminate data converter
images. The 9-MHz is a perfect choice for SDTV
video including composite, S-Video™, and 480i/576i
Y'P'_BP'_R or G'B'R' (R'G'B') video. 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 150-MHz bandwidth, 300-V/µs
amplifier to buffer the signal.
Each channel of the THS7353 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
externally controlled gain adjust pin allows for fine
tuning of the gain such as line driving, compensating
for cable losses, or Sin-X/X compensation.
Input A
Input B
1 of 3 Channels
Bypass
0.1 mF
In A
In B
75 W
0.1 mF
75 W
2:1
X1
+
LPF
9 / 16 /
-
AC
35 MHz
DC +
Sync
250 mV _DC
TIP
AC - ^{Clamp MUTE}
BIAS
0.1 mF
Out
1 kW
250 W ^Gain
Adjust
3.3 V
ADC /
Video
Decoder
I2C-
SDA
I2C-
SCL
3.3 V
Figure 1. 3.3 V Single-Supply AC-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 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