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| TSH173 Triple video buffer with filter for SD video Features 4.5V to 5.5V single supply operation R-G-B, Y-Pb-Pr, Y-C-CVBS driving 3 channels with 6dB gain buffer 3 video reconstruction filters for SD 3 internal input DC level shifter No input capacitor is required Very low harmonic distortion Each output can drive AC- or DC-coupled 150 loads Tested on 5V power supply Data min. and max. are tested during production IN2 2 8.2MHz 5th order 8.2MHz 5th order DC Shifter Pin connections (top view) IN1 1 8.2MHz 5th order 6dB 8 OUT1 6dB 7 OUT2 IN3 3 6dB 6 OUT3 5 GND Applications Set top boxes DVD players/recorders High-end video systems Standard definition TV (SD) Multimedia products +Vcc 4 SO8 Description The TSH173 is a single supply triple video buffer featuring an internal gain of 6dB and an internal low pass filter of 8.2MHz cut-off frequency for each channel to fit with Standard Definition requirements for video line interfaces. Another advantage of the TSH173 is its input DC level shifter to drive the video signal on a 75 video line without any damage to the synchronization tip, while using a single 5V power supply with no input capacitor. The DC level shifter is internally fixed and optimized to keep the output video signal between low and high output rails in the best position to improve linearity. This datasheet gives technical information on using the TSH173 as a R-G-B, Y-Pb-Pr, or Y-CCVBS driver for video DAC outputs on a video line. The TSH173 is available in SO8 plastic package. March 2007 Rev 1 1/13 www.st.com 13 Contents TSH173 Contents 1 2 3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.1 3.2 Synchronization tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 5 6 7 Using the TSH173 to drive video components . . . . . . . . . . . . . . . . . . . 10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 TSH173 Absolute maximum ratings 1 Absolute maximum ratings Table 1. Symbol VCC Absolute maximum ratings Parameter Supply voltage (1) Operating free air temperature range Storage temperature Maximum junction temperature SO8 thermal resistance junction to case SO8 thermal resistance junction to ambient area Maximum power dissipation (@Tamb=25C) for Tj=150C CDM: charged device model HBM: human body model MM: machine model Output short-circuit Value 6 -40 to +85 -65 to +150 150 28 157 800 1.5 2 200 (2) Unit V C C C C/W C/W mW kV kV V Toper Tstg Tj Rthjc Rthja Pmax. ESD 1. All voltage values, except differential voltage, are with respect to network terminal. 2. An output current limitation protects the circuit from transient currents. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on amplifiers. 2 Operating conditions Table 2. Symbol VCC Operating conditions Parameter Power supply voltage Value 4.5 to 5.5(1) Unit V 1. Tested in full production at 0V/5V single power supply. 3/13 Electrical characteristics TSH173 3 Table 3. Symbol Electrical characteristics VCC = +5V single supply, load: RL = 150, Tamb = 25C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit DC performance 0.6 VDC Output DC shift -40C < Tamb < +85C Input bias current VCC=+5V, Vicm=100mV -40C < Tamb < +85C Power supply rejection ratio 20 log (Vcc/Vout) VCC=+5V, VCC=200mVp-p, F=1MHz (without any improvement of the power supply noise rejection) Vicm=100mV, no load -40C < Tamb < +85C 1.95 G GM VOH VOL DC voltage gain -40C < Tamb < +85C Gain matching High level output voltage Low level output voltage Isink IOUT Isource Dynamic performance (5th order filter) -3dB bandwidth FC-SD Fatt Flatness gd D dG dPh Noise SNR Signal-to-noise ratio Bw = 10kHz to 6MHz 62 dB -1dB bandwidth Filter attenuation Small signal Small signal Large signal (Vout=2Vp-p) Small signal, F=27MHz 5.5 5 40 8.2 6.5 6.3 50 +/-0.1 17 0.5 0.6 0.15 MHz Vin=0.5V DC Vout is fixed by a generator at 2.5V Vin=0.5V DC Vout is fixed by a generator at 1V 25 -28 3.3 1.95 0.5 3.8 210 34 mA -38 2 % V mV 0.95 3 5 6 A 0.9 1.2 V Iib PSRR 37 dB 7.4 8 2 9 mA 2.05 V/V ICC Supply current per channel dB dB ns ns % Gain flatness along a 4.5MHz 10kHz to 4.5MHz band Vout=2Vp-p Group delay Delay between each channel Differential gain Differential phase 0 to 6MHz 0 to 6MHz 4/13 TSH173 Electrical characteristics Figure 1. 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 100k Frequency response Figure 2. 6.5 6.4 6.3 6.2 Gain flatness Flatness (dB) Vcc=+5V Small signal Vicm=0.5V Load=150 1M 10M Gain (dB) 6.1 6.0 5.9 5.8 5.7 5.6 5.5 100k Vcc=+5V Vin=1Vp-p Vicm=0.5V Load=150 1M 10M Frequency (Hz) Frequency (Hz) Figure 3. 500 Total input noise vs. frequency No load Input to GND Vcc=+5V Figure 4. -30 Distortion on 150 load Vcc=+5V Vicm=0.5V F=1MHz Load=150 -40 400 -50 en (nV/VHz) 300 Distortion (dB) -60 200 -70 HD2 -80 100 -90 HD3 0 100 1k 10k 100k 1M 10M -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Frequency (Hz) Output Amplitude (Vp-p) Figure 5. -30 -35 -40 -45 Cross-talk vs. frequency Vcc=+5V Load=150 Vin=1Vp-p Vicm=+0.5V Figure 6. 5.0 4.5 4.0 Output voltage swing vs. supply Output swing (Vp-p) Cross-talk (dB) -50 -55 -60 -65 -70 -75 -80 -85 -90 100k 1M 10M 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 4.5 F=1MHz Vicm=+0.5V Load=150 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Frequency (Hz) Vcc (V) 5/13 Electrical characteristics TSH173 Figure 7. 30 Quiescent current vs. supply Figure 8. 80 Isink and Isource 25 60 Vcc=+5V Vin=+0.5V DC Vout is fixed by a generator 20 40 Iout (mA) 0 1 2 3 4 5 6 Icc (mA) 20 15 0 10 -20 5 -40 0 1 2 3 4 Vcc (V) Vout (V) Figure 9. 25 24 23 Supply current vs. Tamb Figure 10. Output DC shift vs. Tamb 1.00 0.98 0.96 Vcc=+5V Load=150 Output DCshift (V) Vcc=+5V no Load -20 0 20 40 60 80 0.94 0.92 0.90 0.88 0.86 0.84 0.82 0.80 -40 22 ICC (mA) 21 20 19 18 17 -40 -20 0 20 40 60 80 Ambient Temperature (C) Temperature (C) Figure 11. 6.6 Voltage gain vs. Tamb Figure 12. -1dB bandwidth vs. Tamb 9.0 8.5 6.4 8.0 Vin=100mVp-p 6.2 Bw@-1dB (MHz) 7.5 7.0 6.5 6.0 5.5 5.0 Gain (dB) 6.0 Vin=1Vp-p 5.8 5.6 Vcc=+5V Load=150 5.4 -40 -20 0 20 40 60 80 4.5 4.0 -40 Vcc=5V Load=150 -20 0 20 40 60 80 Ambient Temperature (C) Ambient Temperature (C) 6/13 TSH173 Electrical characteristics Figure 13. Higher output rail vs. Tamb 4.0 Figure 14. Gain matching vs. Tamb 1.0 0.8 3.5 Vcc=+5V Load=150 Vin=+0.3V and +1V 3.0 GM (%) Vcc=5V Load=150 0.6 VOH (V) 0.4 2.5 0.2 2.0 -40 -20 0 20 40 60 80 0.0 -40 -20 0 20 40 60 80 Ambient Temperature (C) Ambient Temperature (C) Figure 15. Isink vs. Tamb 50 Figure 16. Isource vs. Tamb 50 45 45 35 Isource (mA) 40 40 Isink (mA) 35 30 30 25 25 Vcc=+5V 20 -40 -20 0 20 40 60 80 20 -40 Vcc=+5V Load=150 -20 0 20 40 60 80 Ambient Temperature (C) Ambient Temperature (C) Figure 17. Ibias vs. Tamb 5.0 4.5 4.0 3.5 IBIAS (A) 3.0 2.5 2.0 1.5 1.0 -40 Vcc=+5V Load=150 -20 0 20 40 60 80 Ambient Temperature (C) 7/13 Electrical characteristics TSH173 3.1 Synchronization tip The TSH173, in single 0/5V supply, is designed to drive the video signal on the line without any damage to the synchronization tip. This is achieved by a small internal DC shift and a very low output rail. The DAC offset, as shown in Figure 18, can be as low as 0V. Nevertheless, in order to minimize the DC component on the line, the output can be AC coupled by a capacitor (Figure 20). Figure 18. Input signal 160ns 150ns Black (30 IRE) 300mV 4.6s DAC offset 64s (0 IRE) GND Synchronization tip Figure 19. DC coupled output configuration Video DAC 75 TSH173 Vin 75 Cable 75 Vout Figure 20. AC coupled output configuration 220F Video DAC Vin 75 TSH173 75 Cable 75 Vout 8/13 TSH173 Electrical characteristics 3.2 Power supply considerations Correct power supply bypassing is very important for optimizing performance in highfrequency ranges. Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor greater than 10F is necessary to minimize the distortion. For better quality bypassing, we recommend to add a 10nF capacitor, also placed as close as possible to the IC pins. Bypass capacitors must be incorporated for both the negative and the positive supply. Figure 21. Circuit for power supply bypassing +VCC + 10nF 10F 4 IN1 IN2 IN3 TSH173 OUT1 OUT2 OUT3 5 9/13 Using the TSH173 to drive video components TSH173 4 Using the TSH173 to drive video components Figure 22. Video line interface implementation schematics 2.035V 2Vpp 1V 1V 0.3V GND 1Vpp Reconstruction Filtering 0.635V 0.035V GND 1Vpp Video DAC R 450mV + DAC load resistor LPF 5th Order +6dB 75 75 Cable 0.3V 0.0175V GND TV 75 1.4Vpp 0.7Vpp 1.0175V 0.635V GND 2.035V 1V 0.7Vpp Video DAC G 0.3V GND Reconstruction Filtering 450mV + DAC load resistor LPF 5th Order +6dB 75 75 Cable 0.3175V GND 75 1.4Vpp 0.7Vpp 1.0175V 0.635V GND 2.035V 1V 0.7Vpp Video DAC B 0.3V GND 450mV Reconstruction Filtering + DAC load resistor LPF 5th Order +6dB TSH173 75 75 Cable 0.3175V GND 75 The interface is illustrated in Figure 23. It is composed of: Three 75-ohm resistors Three matching resistors One 10F power supply decoupling capacitor One 10nF power supply decoupling capacitor Figure 23. Bill of materials of the interface +5V DAC Y,G Pb,B,C Pr,R,CVBS R 75 75 R R Cable DAC Cable TV TSH173 SO8 75 DAC Cable 10/13 TSH173 Package mechanical data 5 Package mechanical data Figure 24. SO-8 package Dimensions Ref. Min. Millimeters Typ. Max. Min. Inches Typ. Max. A A1 A2 B C D E e H h L k ddd 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40 1.75 0.25 1.65 0.51 0.25 5.00 4.00 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.069 0.010 0.065 0.020 0.010 0.197 0.157 6.20 0.50 1.27 0.228 0.010 0.016 8 (max.) 0.244 0.020 0.050 0.1 0.04 11/13 Ordering information TSH173 6 Ordering information Table 4. Order codes Temperature range Package Packaging Marking Part number TSH173ID -40C to +85C TSH173IDT SO-8 SO-8 Tube Tape & reel TSH173I TSH173I 7 Revision history Date Revision Changes 21-Mar-2007 1 Initial release. 12/13 TSH173 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 13/13 |
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