THS7347_15 Datasheet, PDF (1/33 Pages) Texas Instruments – 3-Channel RGBHV Video Buffer with I2C Control, 2:1 Input Mux, Monitor Pass-Through, and Selectable Input Bias Modes

THS7347
www.ti.com
SLOS531B – MAY 2007 – REVISED OCTOBER 2011
3-Channel RGBHV Video Buffer with I²C™ Control, 2:1 Input Mux,
Monitor Pass-Through, and Selectable Input Bias Modes
Check for Samples: THS7347
FEATURES
1
•2345 3-Video Amplifiers for CVBS, S-Video, EDTV,
HDTV Y'P'_BP'_R, G'B'R', and R'G'B' Video
• H/V Sync Paths with Adjustable Schmitt
Trigger
• 2:1 Input Mux
• I²C Control of All Functions on Each Channel
• Unity-Gain Buffer Path for ADC Buffering:
– 500-MHz Bandwidth, 1200-V/μs Slew Rate
• Monitor Pass-Through Function:
– 500-MHz Bandwidth, 1300-V/μs Slew Rate
– 6-dB Gain with SAG Correction Capable
– High Output Impedance in Disable State
• Selectable Input Bias Modes:
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Bias
– DC-Coupled with Offset Shift
– DC-Coupled
• +2.7-V to +5-V Single-Supply Operation
• Total Power Consumption: 265 mW at 3.3 V
• Disable Function Reduces Current to 0.1 μA
• Rail-to-Rail Output:
– Output Swings Within 0.1 V of the Rails,
Allowing AC- or DC-Output Coupling
• Lead-free, RoHS TQFP Package
APPLICATIONS
• Projectors
• Professional Video Systems
• LCD/ DLP^®/LOCS Input Buffering
DESCRIPTION
Fabricated using the revolutionary complimentary
silicon-germanium (SiGe) BiCom3 process, the
THS7347 is a low-power, single-supply 2.7-V to 5-V
3-channel integrated video buffer with horizontal (H)
and vertical (V) sync signal paths. It incorporates a
500-MHz bandwidth, 1200-V/μs unity-gain buffer ideal
for driving analog-to-digital converters (ADCs) and
video decoders. In parallel with the unity-gain buffer,
a monitor pass-through path allows for passing the
input signal on to other systems. This path has a
6-dB gain, 500-MHz bandwidth, 1300-V/μs slew rate,
SAG correction capability, and high output impedance
while disabled.
Each channel of the THS7347 is individually
I²C-configurable for all functions, including controlling
the 2:1 input mux. Its rail-to-rail output stage allows
for both ac- and dc-coupling applications.
Input 1
Input 2
0.1 mF
In A
In B
75 W
0.1 mF
75 W
2:1
DC
+Offset
DC
AC-
BIAS
X1
AC
Sync
TIP
Clamp
SDA SCL
3.3 V
0.1 mF
+
ADC
-
Disable
= OPEN
1 kW
+
-
878 W
47 mF
Out
675 W
33 mF
SAG
150 W
75 W
Monitor
Output
75 W
3.3 V
3.3 V Single-Supply Projector Input System with Monitor Pass-Through
(One of Three R'G'B' Channels Shown)
1
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.
PowerPAD is a trademark of Texas Instruments.
2
DLP is a registered trademark of Texas Instruments.
3
I²C is a trademark of NXP Semiconductors, Inc.
4
All other trademarks are the property of their respective owners.
5
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 © 2007–2011, Texas Instruments Incorporated