THS7327 Datasheet, PDF (1/26 Pages) Texas Instruments – 3-Channel RGBHV Video Buffer with I2C Control, Selectable Filters, Monitor Pass-Thru,2:1 Input MUX, and Selectable Input Bias Modes

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THS7327
SLOS502 – SEPTEMBER 2006
3-Channel RGBHV Video Buffer with I²C Control, Selectable Filters, Monitor Pass-Thru,
2:1 Input MUX, and Selectable Input Bias Modes
FEATURES
• 3-Video Amplifiers for CVBS, S-Video,
SD/ED/HD Y'P'_BP'_R, G'B'R', and R'G'B' Video
• HV Sync Paths With Adj. Schmitt Trigger
• 2:1 Input MUX
• I²C™ Control of All Functions
• Integrated Low-Pass Filters on ADC Buffers
– 5^th Order Butterworth Characteristics
– Selectable Corner Frequencies of 9-MHz,
16-MHz, 35-MHz, and 75-MHz with Bypass
(500-MHz)
• Selectable Input Bias Modes
– AC-Coupled with Sync-Tip Clamp
– AC-Coupled with Bias
– DC-Coupled with Offset Shift
– DC-Coupled
• Monitor Pass-Thru Function:
– Passes the Input Signal With no Filtering
– 500-MHz BW and 1300 V/µs Slew Rate
– 6-dB Gain With SAG Correction Capable
– High Output Impedance in Disable State
• 2.7-V to 5-V Single Supply Operation
• Low 330 mW at 3.3-V Power Consumption
• Disable Function Reduces Current to <1 µA
• Rail-to-Rail Output:
– Output Swings Within 0.1 V From the Rails
Which Allows AC or DC Output Coupling
• RoHS TQFP Package
APPLICATIONS
• Projectors
• Professional Video Systems
• LCD/DLP/LOCS Input Buffering
DESCRIPTION
Fabricated using the new complimentary
silicon-germanium (SiGe) BiCom-III process, the
THS7327 is a low-power, single-supply 2.7-V to 5-V,
3-channel integrated video buffer with H and V Sync
signal paths. It incorporates a selectable 5^th order
Butterworth anti-aliasing filter on each channel. The
9-MHz is a perfect choice for SDTV video including
composite, S-Video™, and 480i/576i. The 16-MHz
filter is ideal for EDTV 480p/576p, and VGA signals.
The 35-MHz filter is useful for HDTV 720p/1080i, and
SVGA signals. The 75-MHz filter is ideal for HDTV
1080p and XGA/SXGA signals. For UXGA/QXGA
R’G’B’ signals, the filter can be bypassed allowing a
500-MHz bandwidth, 1150-V/µs amplifier to buffer
the signal.
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
Bypass
LPF
9/16/35/
75 MHz
Disable
= OPEN
1 kW
+
-
+
-
878 W
0.1 mF
3.3 V
ADC
47 mF
Out
675 W
33 mF
SAG
150 W
75 W
Monitor
Output
75 W
SDA 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.
PowerPAD is a trademark of Texas Instruments.
S-Video is a trademark of its respective owner.
I2C is a trademark of Philips Electronics.
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 © 2006, Texas Instruments Incorporated