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SOC/DAC/Encoder

S-Video

Y’

S-Video

C’

Y'/G'

SD1OUT

SD2OUT

SD3OUT

DisableSD

GND

DisableSF

SF1OUT

SF2OUT

SF3OUT

BypassSF

SD1IN

SD2IN

SD3IN

Filter2

S+

Filter1

SF1IN

SF2IN

SF3IN

BypassSD

THS7368

Bypass

SDLPF

Bypass

SFLPF

P' /B'

CVBS

P' /R'

75 W

CVBS

75 W

S-VideoY'Out

75 W

S-VideoC'Out

75 W

Y'/G'Out

75 W

P' /B'Out

75 W

P' /R'Out

75 W

+2.7Vto

+5V

DisableSF

DisableSD

Filter2

Filter1

THS7368

www.ti.com

SBOS497 –DECEMBER 2009

6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and 6-dB Gain

Check for Samples: THS7368

FEATURES

DESCRIPTION

2345

• Three SDTV Video Amplifiers for CVBS,

Fabricated using the revolutionary, complementary

S-Video, Y’/P’

/P’

, 480i/576i, Y’U’V’, or G'B'R'

Silicon-Germanium (SiGe) BiCom3X process, the

THS7368 is a low-power, single-supply, 2.7-V to 5-V,

• Three SD/ED/HD/Full-HD Selectable Filters for

six-channel integrated video buffer. It incorporates

Y’/P’

/P’

, G’B’R’, or Computer RGB

three SDTV filters and three selectable

• Bypassable Sixth-Order Low-Pass Filters:

SD/ED/HD/Full-HD (also known as True-HD) HDTV

– Fixed SD Channels: 9.5-MHz

filters. All filters feature bypassable sixth-order

Butterworth characteristics that are useful as

– Selectable Channels:

digital-to-analog converter (DAC) reconstruction filters

9.5-MHz/18-MHz/36-MHz/72-MHz

or as analog-to-digital converter (ADC) anti-aliasing

• Versatile Input Biasing:

filters.

– DC-Coupled with 300-mV Output Shift

The THS7368 has flexible input coupling capabilities

– AC-Coupled with Sync-Tip Clamp or Bias

that can be configured for either ac- or dc-coupled

• Built-in 6-dB Gain (2 V/V)

inputs. The 300-mV output level shift allows for a full

sync dynamic range at the output with 0-V input. The

• +2.7-V to +5-V Single-Supply Operation

ac-coupled modes include a transparent sync-tip

• Rail-to-Rail Output:

clamp for CVBS, Y', and G'B'R' signals. AC-coupled

– Output Swings Within 100 mV from the

biasing for C'/P'

/P'

channels can easily be achieved

Rails: Allows AC or DC Output Coupling

by adding an external resistor to V

S+

– Supports Driving Two Video Lines/Channel

The THS7368 is an ideal choice for all video buffer

applications. Its rail-to-rail output stage with 6-dB gain

• Low Total Quiescent Current: 23.4 mA at 3.3 V

allows for both ac and dc line driving. The ability to

• Disabled Supply Current Function: 0.1 μA

drive two lines, or 75-Ω loads, allows for maximum

• Low Differential Gain/Phase: 0.2%/0.35°

flexibility as a video line driver. The 23.4-mA total

quiescent current at 3.3 V and 0.1 μA (disabled

APPLICATIONS

mode) makes it a good choice for systems that must

meet power-sensitive Energy Star

standards.

• Set Top Box Output Video Buffering

• PVR/DVDR Output Buffering

The THS7368 is available in a TSSOP-20 package

• BluRay™ Output Video Buffer

that is lead-free and green (RoHS-compliant).

Figure 1. 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.

2BluRay is a trademark of Blu-ray Disc Association (BDA).

3Energy Star is a registered trademark of Energy Star.

4Macrovision is a registered trademark of Macrovision Corporation.

5All 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.

Summary of content (40 pages)

PAGE 1
THS7368 www.ti.com SBOS497 – DECEMBER 2009 6-Channel Video Amplifier with 3-SD and 3-SD/ED/HD/Full-HD Filters and 6-dB Gain Check for Samples: THS7368 FEATURES DESCRIPTION • Three SDTV Video Amplifiers for CVBS, S-Video, Y’/P’B/P’R, 480i/576i, Y’U’V’, or G'B'R' • Three SD/ED/HD/Full-HD Selectable Filters for Y’/P’B/P’R, G’B’R’, or Computer RGB • Bypassable Sixth-Order Low-Pass Filters: – Fixed SD Channels: 9.5-MHz – Selectable Channels: 9.
PAGE 2
THS7368 SBOS497 – DECEMBER 2009 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 3
THS7368 www.ti.com SBOS497 – DECEMBER 2009 ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 6.6 8.2 10 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.2 VPP and 2 VPP 8 9.5 11 MHz B –3 dB; VO = 0.2 VPP 85 150 MHz B Bypass mode; VO = 2 VPP 75 125 V/μs B –0.9 0.
PAGE 4
THS7368 SBOS497 – DECEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) AC PERFORMANCE (SF CHANNELS, ED FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 11 16 18.5 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.2 VPP and 2 VPP 15 18 21 MHz B , f = 11 MHz –1 –0.
PAGE 5
THS7368 www.ti.com SBOS497 – DECEMBER 2009 ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) AC PERFORMANCE (SF CHANNELS, FULL-HD/TRUE-HD FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 53 58 66 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.2 VPP and 2 VPP 60 72 83 MHz B –0.5 0.
PAGE 6
THS7368 SBOS497 – DECEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +3.3 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) VIN = 0 V, SD channels 200 305 400 mV A VIN = 0 V, SF channels 200 300 400 mV A DC PERFORMANCE Biased output voltage Input voltage range DC input, limited by output Sync-tip clamp charge current –0.1/1.46 V C VIN = –0.
PAGE 7
THS7368 www.ti.com SBOS497 – DECEMBER 2009 ELECTRICAL CHARACTERISTICS: VS+ = +5 V At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 6.6 8.2 10.2 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.2 VPP and 2 VPP 8 9.5 11.3 MHz B –3 dB; VO = 0.
PAGE 8
THS7368 SBOS497 – DECEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) AC PERFORMANCE (SF CHANNELS, ED FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 11 16 18.5 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.
PAGE 9
THS7368 www.ti.com SBOS497 – DECEMBER 2009 ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) AC PERFORMANCE (SF CHANNELS, FULL/TRUE-HD FILTER) Passband bandwidth –1 dB; VO = 0.2 VPP and 2 VPP 53 60 66 MHz B Small- and large-signal bandwidth –3 dB; VO = 0.
PAGE 10
THS7368 SBOS497 – DECEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS: VS+ = +5 V (continued) At TA = +25°C, RL = 150 Ω to GND, Filter mode, and dc-coupled input/output, unless otherwise noted. THS7368 PARAMETER TEST CONDITIONS MIN TYP MAX UNITS TEST LEVEL (1) VIN = 0 V, SD channels 200 305 400 mV A VIN = 0 V, SF channels 200 300 400 mV A DC PERFORMANCE Biased output voltage Input voltage range DC input, limited by output Sync-tip clamp charge current –0.1/2.3 V C VIN = –0.
PAGE 11
THS7368 www.ti.com SBOS497 – DECEMBER 2009 PIN CONFIGURATION PW PACKAGE TSSOP-20 (TOP VIEW) SD1 IN 1 20 SD1 OUT SD2 IN 2 19 SD2 OUT SD3 IN 3 18 SD3 OUT Filter 2 4 17 Disable SD VS+ 5 16 GND Filter 1 6 15 Disable SF SF1 IN 7 14 SF1 OUT SF2 IN 8 13 SF2 OUT SF3 IN 9 12 SF3 OUT Bypass SD 10 11 Bypass SF NOTE: NC = No connection. TERMINAL FUNCTIONS TERMINAL NAME NO. I/O SD1 IN 1 I Standard-definition video input, channel 1; LPF = 9.
PAGE 12
THS7368 SBOS497 – DECEMBER 2009 www.ti.com FUNCTIONAL BLOCK DIAGRAM +VS gm SD Channel 1 Input (CVBS) Level Shift LPF Sync-Tip Clamp (DC Restore) 800 kW Bypass SD 6 dB SD Channel 1 Output (CVBS) 6 dB SD Channel 2 Output (S-Video Y) 6 dB SD Channel 3 Output (S-Video C) 6-Pole 9.5 MHz +VS gm SD Channel 2 Input (S-Video Y) Level Shift LPF Sync-Tip Clamp (DC Restore) 800 kW Bypass SD 6-Pole 9.
PAGE 13
THS7368 www.ti.com SBOS497 – DECEMBER 2009 TYPICAL CHARACTERISTICS Table 3. Table of Graphs: 3.
PAGE 14
THS7368 SBOS497 – DECEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS: 3.3 V, Standard-Definition (SD) Channels With load = 150 Ω || 10 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 10 SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 6.5 RL = 150 W Small-Signal Gain (dB) Small-Signal Gain (dB) RL = 75 W -10 Bypass Mode -20 Filter Mode -30 -40 -50 Bypass Mode 6.0 0 RL = 150 W VS = +3.
PAGE 15
THS7368 www.ti.com SBOS497 – DECEMBER 2009 TYPICAL CHARACTERISTICS: 3.3 V, Standard-Definition (SD) Channels (continued) With load = 150 Ω || 10 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS PHASE vs FREQUENCY RESPONSE SD CHANNELS GROUP DELAY vs FREQUENCY RESPONSE 120 45 0 -45 Group Delay (ns) Filter Mode -90 Phase (°) 110 RL = 75 W and 150 W Bypass Mode -135 RL = 75 W and 150 W -180 -225 VS = +3.
PAGE 16
THS7368 SBOS497 – DECEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS: 3.3 V, Selectable Filter (SF) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 10 6.5 0 6.0 Bypass SD Filter Small-Signal Gain (dB) Small-Signal Gain (dB) SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE -10 Full-HD Filter -20 ED Filter HD Filter -30 -40 VS = +3.
PAGE 17
THS7368 www.ti.com SBOS497 – DECEMBER 2009 TYPICAL CHARACTERISTICS: 5 V, Standard-Definition (SD) Channels With load = 150 Ω || 10 pF, dc-coupled input and output, unless otherwise noted. SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 10 SD CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 6.5 RL = 150 W Bypass Mode -20 -30 RL = 150 W -50 VS = +5 V Load = RL || 10 pF DC-Coupled Output VO = 200 mVPP -60 100 k 10 M 100 M 5.5 5.0 4.0 3.
PAGE 18
THS7368 SBOS497 – DECEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS: 5 V, Standard-Definition (SD) Channels (continued) With load = 150 Ω || 10 pF, dc-coupled input and output, unless otherwise noted.
PAGE 19
THS7368 www.ti.com SBOS497 – DECEMBER 2009 TYPICAL CHARACTERISTICS: 5 V, Selectable Filter (SF) Channels With load = 150 Ω || 5 pF, dc-coupled input and output, unless otherwise noted. SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE 10 6.5 0 6.0 Bypass SD Filter Small-Signal Gain (dB) Small-Signal Gain (dB) SF CHANNELS SMALL-SIGNAL GAIN vs FREQUENCY RESPONSE -10 Full-HD Filter -20 ED Filter HD Filter -30 -40 VS = +5 V Load = 150 W || 5 pF DC-Coupled Output VO = 200 mVPP -50 -60 1M 5.
PAGE 20
THS7368 SBOS497 – DECEMBER 2009 www.ti.com APPLICATION INFORMATION The THS7368 is targeted for six-channel video output applications that require three standard-definition (SD) video output buffers and three selectable filter (SF) output buffers. Although it can be used for numerous other applications, the needs and requirements of the video signal are the most important design parameters of the THS7368.
PAGE 21
THS7368 www.ti.com SBOS497 – DECEMBER 2009 TYPICAL CONFIGURATION AND VIDEO TERMINOLOGY departs from true luminance because a nonlinear term, gamma, is added to the true RGB signals to form R’G’B’ signals. These R’G’B’ signals are then used to mathematically create luma (Y’). Thus, luminance (Y) is not maintained, providing a difference in terminology. A typical application circuit using the THS7368 as a video buffer is shown in Figure 37.
PAGE 22
THS7368 SBOS497 – DECEMBER 2009 www.ti.com R’G’B’ (commonly mislabeled RGB) is also called G’B’R’ (again commonly mislabeled as GBR) in professional video systems. The Society of Motion Picture and Television Engineers (SMPTE) component standard stipulates that the luma information is placed on the first channel, the blue color difference is placed on the second channel, and the red color difference signal is placed on the third channel. This practice is consistent with the Y'/P'B/P'R nomenclature.
PAGE 23
THS7368 www.ti.com SBOS497 – DECEMBER 2009 INPUT MODE OF OPERATION: AC SYNC TIP CLAMP Some video DACs or encoders are not referenced to ground but rather to the positive power supply. The resulting video signals are generally at too great a voltage for a dc-coupled video buffer to function properly. To account for this scenario, the THS7368 incorporates a sync-tip clamp circuit. This function requires a capacitor (nominally 0.1 μF) to be in series with the input.
PAGE 24
THS7368 SBOS497 – DECEMBER 2009 www.ti.com However, what happens if the input signal goes above the 0-V input level? The problem is the video signal is always above this level and must not be altered in any way. Thus, if the sync level of the input signal is above this 0-V level, then the internal discharge (sink) current reduces the ac-coupled bias signal to the proper 0-V level. This discharge current must not be large enough to alter the video signal appreciably or picture quality issues may arise.
PAGE 25
THS7368 www.ti.com SBOS497 – DECEMBER 2009 Macrovision®, the CVBS signal can reach up to 1.23 VPP at the input, or 2.46 VPP at the output of the THS7368. In contrast, other signals are typically 1 VPP or 0.7 VPP at the input which translate to an output voltage of 2 VPP or 1.4 VPP. The output bias voltage must account for a worst-case situation, depending on the signals involved. One other issue that must be taken into account is the dc-bias point is a function of the power supply.
PAGE 26
THS7368 SBOS497 – DECEMBER 2009 www.ti.com CVBS 1 Out 75 W THS7368 CVBS R S-Video Y’ SOC/DAC/Encoder R +2.
PAGE 27
THS7368 www.ti.com SBOS497 – DECEMBER 2009 channels. One way to help ensure this condition is satisfied is to make sure the 75-Ω source resistor is placed next to each THS7368 output pin. If a large ac-coupling capacitor is used, the capacitor should be placed after this resistor. There are many reasons dc-coupling is desirable, including reduced costs, PCB area, and no line tilt. A common question is whether or not there are any drawbacks to using dc-coupling.
PAGE 28
THS7368 SBOS497 – DECEMBER 2009 www.ti.com THS7368 (1) 0.1 mF R (1) 0.1 mF +2.7 V to +5 V R (1) 0.1 mF R (1) 0.
PAGE 29
THS7368 www.ti.com SBOS497 – DECEMBER 2009 –3-dB corner frequency was designed to achieve 54 dB of attenuation at 27 MHz—a common sampling frequency between the DAC/ADC second and third Nyquist zones found in many video systems. This consideration is important because any signal that appears around this frequency can also appear in the baseband as a result of aliasing effects of an ADC found in a receiver. The THS7368 SF filters have a nominal corner (–3 dB) frequency at 9.
PAGE 30
THS7368 SBOS497 – DECEMBER 2009 www.ti.com source impedance (which includes the source, series resistor, and the filter) must be better than 75 Ω, +9/–8 Ω. The THS7368 is an operational amplifier that approximates an ideal voltage source, which is desirable because the output impedance is very low and can source and sink current. To properly match the transmission line characteristic impedance of a video line, a 75-Ω series resistor is placed on the output.
PAGE 31
THS7368 www.ti.com SBOS497 – DECEMBER 2009 EVALUATION MODULE To evaluate the THS7368, an evaluation module (EVM) is available. The THS7368EVM allows for testing the THS7368 in many different configurations. Inputs and outputs include BNC connectors and RCA connectors commonly found in video systems, along with 75-Ω input termination resistors, 75-Ω series source termination resistors, and 75-Ω characteristic impedance traces.
PAGE 32
THS7368 www.ti.com + + SBOS497 – DECEMBER 2009 Figure 43.
PAGE 33
THS7368 www.ti.com SBOS497 – DECEMBER 2009 Figure 44.
PAGE 34
THS7368 SBOS497 – DECEMBER 2009 www.ti.com Figure 45.
PAGE 35
THS7368 www.ti.com SBOS497 – DECEMBER 2009 THS7368EVM Bill of Materials Table 7. THS7368 EVM ITEM REF DES QTY DESCRIPTION SMD SIZE 1 FB1, FB2 2 Bead, ferrite, 2.5 A, 330 Ω 2 C12 1 Capacitor, 100 µF, tantalum, 10V, 10%, low ESR 3 C40 1 Capacitor, 22 µF, tantalum, 16V, 10%, low ESR 4 C1-C6, C13-C18, C31-C36 18 Open 0805 5 C37 1 Capacitor, 0.
PAGE 36
THS7368 SBOS497 – DECEMBER 2009 www.ti.com EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.