TSH344 340MHz single-supply triple video buffer Features ■ Bandwidth: 340MHz ■ 5V single-supply operation ■ Low output rail guaranteed at 60mV max ■ Internal gain of 6dB for a matching between 3 channels ■ Very low harmonic distortion ■ Slew rate: 740V/ms ■ Specified for 150Ω and 100Ω loads ■ Tested on 5V power supply ■ Min. and max. data tested during production Pin connections (top view) Pin1 identification Top View Applications ■ High-end video systems ■ High definition TV (HDTV) ■ Broadcast and graphic video ■ Multimedia products IN1 1 6dB 8 OUT1 IN2 2 6dB 7 OUT2 IN3 3 6dB 6 OUT3 5 GND +Vcc 4 Description SO8 The TSH344 is a triple single-supply video buffer featuring an internal gain of 6dB and a large bandwidth of 340MHz. The main advantage of this buffer is its very low output rail very close to GND when supplied in single supply 0/5V. This output rail is guaranteed by test at 60mV from GND on 150Ω. This datasheet gives technical information on using the TSH344 as an RGB driver for video DAC output on a video line. See the TSH343 datasheet for Y-Pb-Pr signals. The TSH344 is available in the compact SO8 plastic package for optimum space-saving. March 2007 Rev 4 1/17 www.st.com 17 Contents TSH344 Contents 1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 Using the TSH344 to drive R-G-B video components . . . . . . . . . . . . . . . 10 3.2 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.3 Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 TSH344 1 Absolute maximum ratings and operating conditions Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings (AMR) Symbol VCC Vin Parameter Supply voltage (1) Input voltage range (2) Value Unit 6 V 0 to +2 V Toper Operating free air temperature range -40 to +85 °C Tstg Storage temperature -65 to +150 °C Maximum junction temperature 150 °C Rthjc SO8 thermal resistance junction to case 28 °C/W Rthja SO8 thermal resistance junction to ambient area 157 °C/W Pmax Maximum power dissipation (@Tamb=25°C) for Tj=150°C 800 mW ESD CDM: charged device model HBM: human body model MM: machine model 2 1.5 200 kV kV V Value Unit 3 to 5.5 V Tj 1. All voltage values, except differential voltage, are with respect to network terminal. 2. The magnitude of input and output voltage must never exceed VCC +0.3V. Table 2. Symbol VCC Operating conditions Parameter Power supply voltage (1) 1. Tested in full production at 0V/5V single power supply. 3/17 Electrical characteristics TSH344 2 Electrical characteristics Table 3. VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. -35 -8 +35 Unit DC performance VOS Output offset voltage(1) Iib Input bias current Rin Cin PSRR ICC G MG1 MG0.3 No load, Tamb mV -40°C < Tamb < +85°C -8.6 Tamb, input to GND 5.5 16 μA -40°C < Tamb < +85°C 6 Input resistance Tamb 4 GΩ Input capacitance Tamb 1 pF Power supply rejection ratio 20 log (ΔVCC/ΔVout)(2) Input to GND, F=1MHz, ΔVCC=200mV -90 dB No load, input to GND 10.1 -40°C < Tamb < +85°C 10.3 13 Supply current per buffer mA RL = 150Ω, Vin=1V 2 2.05 V/V Gain matching between 3 channels Input = 1V 0.5 2 % Gain matching between 3 channels Input = 0.3V 0.5 2 % DC voltage gain 1.92 Dynamic performance and output characteristics -3dB bandwidth Small signal Vout=20mVp Vicm=0.6V, RL = 150Ω Gain flatness @ 0.1dB Small signal Vout=20mVp Vicm=0.6V, RL = 150Ω Full power bandwidth Vicm=0.6V, Vout = 2Vp-p, RL = 150Ω Delay between each channel 0 to 30MHz SR Slew rate (3) Vicm=0.6V, Vout = 2Vp-p, RL = 150Ω VOH High level output voltage RL = 150Ω VOL Low level output voltage RL = 150Ω Bw FPBW D Output current -40°C < Tamb < +85°C IOUT Output short circuit current (Isource) 4/17 Vout= 2Vp, Tamb 190 340 MHz 65 130 200 MHz 0.5 ns 500 740 V/μs 3.7 3.9 V 40 45 60 mV 93 mA 83 100 mA TSH344 Table 3. Electrical characteristics VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. Unit Noise and distortion F = 100kHz, Rin = 50Ω eN Total input voltage noise 8 nV/√Hz Rin = 50Ω Bw=30MHz Bw=100MHz 55 100 μVrms HD2 2nd harmonic distortion Vout = 2Vp-p, RL = 150Ω F= 10MHz F= 30MHz -57 -42 dBc HD3 3rd harmonic distortion Vout = 2Vp-p, RL = 150Ω F= 10MHz F= 30MHz -72 -51 dBc 1. Output offset voltage is determined by the following expression: VOUT =G.VIN+VOS. 2. See Figure 28 and Figure 29. 3. Non-tested value, guaranteed by design and evaluation. See Figure 12. 5/17 Electrical characteristics Frequency response Figure 2. 10 6,2 8 6,1 6 6,0 4 5,9 Gain (dB) Gain (dB) Figure 1. TSH344 2 0 -2 5,8 5,7 5,6 -4 5,5 -6 5,4 Vcc=5V Load=150Ω -8 -10 1M Vcc=5V Load=150 Ω 5,3 10M 100M Gain flatness 5,2 1M 1G 10M Figure 3. 100M 1G Frequency (Hz) Frequency (Hz) Cross-talk vs. frequency (amp1) Figure 4. 0 Cross-talk vs. frequency (amp2) 0 Small Signal Vcc=5V Load=150Ω -10 -20 Small Signal Vcc=5V Load=150Ω -20 -30 Gain (dB) Gain (dB) -40 -50 1/2 -60 -40 2/1 -60 -70 -80 -80 1/3 2/3 -90 -100 1M 10M -100 1M 100M 10M Frequency (Hz) Figure 5. 100M Frequency (Hz) Cross-talk vs. frequency (amp3) Figure 6. Input noise vs. frequency 0 Input Noise (nV/VHz) Gain (dB) -20 Vcc=5V DC input = 1.5V (Battery) Small Signal Vcc=5V Load=150Ω -40 -60 3/1 -80 -100 1M 3/2 10M Frequency (Hz) 100 10 100M 10 100 1k 10k 100k Frequency (Hz) 6/17 1M 10M TSH344 Electrical characteristics Figure 7. Distortion on 150Ω load - 10MHz Figure 8. -30 -40 HD2 & HD3 (dBc) -45 -50 -30 -35 Vcc=5V F=10MHz input DC component = 1.15V Load=150Ω -45 -55 -60 -65 HD2 -70 Vcc=5V F=10MHz input DC component = 1.15V Load=100 Ω -40 HD2 & HD3 (dBc) -35 Distortion on 100Ω load - 10MHz -75 -80 -85 -50 -55 -60 -65 -70 HD2 -75 -80 -85 HD3 -90 HD3 -90 -95 -95 -100 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 -100 0,0 4,0 0,5 1,0 Output Amplitude (Vp-p) Figure 9. Distortion on 150Ω load - 30MHz 2,5 3,0 3,5 4,0 -10 -15 -15 Vcc=5V F=30MHz input DC component = 1.15V Load=150 Ω -25 -30 -25 -35 -40 -45 -50 HD2 -55 Vcc=5V F=30MHz input DC component = 1.15V Load=100 Ω -20 HD2 & HD3 (dBc) -20 HD2 & HD3 (dBc) 2,0 Figure 10. Distortion on 100Ω load - 30MHz -10 -60 -65 -30 -35 -40 -45 -50 HD2 -55 -60 -65 HD3 -70 HD3 -70 -75 -75 -80 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 -80 0,0 4,0 0,5 1,0 Output Amplitude (Vp-p) 2,0 2,5 3,0 3,5 4,0 Figure 12. Slew rate 0 4,0 -10 +5V 3,5 VOH -20 without load Output Response (V) -30 Isource -40 V -50 0V -60 -70 -80 -90 SR+ 3,0 2,5 2,0 SR- 1,5 1,0 -100 Vcc=5V Load=150Ω 0,5 -110 -120 0,0 1,5 Output Amplitude (Vp-p) Figure 11. Output current Isource (mA) 1,5 Output Amplitude (Vp-p) 0,0 0,5 1,0 1,5 2,0 2,5 V (V) 3,0 3,5 4,0 4,5 5,0 -2 -1 0 1 2 3 4 5 6 7 8 Time (ns) 7/17 Electrical characteristics TSH344 Figure 13. Reverse isolation vs. frequency Figure 14. Output swing vs. frequency 0 5 Vcc=5V Load=150Ω -10 -20 4 Vout max. (Vp-p) -30 Gain (dB) -40 -50 -60 -70 3 2 -80 1 Vcc=5V Load=100Ω or Load=150Ω -90 -100 1M 10M 0 1M 100M 10M Frequency (Hz) Figure 15. Quiescent current vs. supply Figure 16. Output swing vs. supply 5 30 Vcc=5V no load 4 Vout peak-peak (Vp-p) Total Icc (mA) 25 100M Frequency (Hz) 20 15 10 3 2 1 5 0 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 Vcc=5V F=30MHz Load=100 Ω or 150 Ω 0 3,00 5,0 3,25 3,50 3,75 4,00 4,25 4,50 4,75 5,00 Vcc (V) Vcc (V) Figure 17. Bandwidth vs. temperature Figure 18. Voltage gain vs. temperature 2,05 500 2,04 450 2,03 400 Gain (dB) Bw (MHz) 2,02 350 300 250 2,01 2,00 1,99 1,98 200 1,97 150 100 -40 Vcc=5V Load=150Ω -20 1,96 0 20 40 Temperature (°C) 8/17 60 80 1,95 -40 Vcc=5V Load=150Ω -20 0 20 40 Temperature (°C) 60 80 TSH344 Electrical characteristics Figure 19. Ibias vs. temperature Figure 20. Gain matching vs. temperature 2 1,0 3 0,8 4 0,6 GM (%) IBIAS (μA) Vcc=5V Load=150 Ω 5 6 7 -40 Gain Matching between 3 channels Vcc=5V Load=150Ω Vin=0.3V and 1V 0,4 0,2 -20 0 20 40 60 0,0 -40 80 -20 0 Temperature (°C) Figure 21. Supply current vs. temperature 80 100 Isource (mA) ICC (mA) 60 110 11 10 9 7 -40 40 Figure 22. Output current vs. temperature 12 8 20 Temperature (°C) Vcc=5V no Load -20 90 80 70 60 0 20 40 60 50 -40 80 Vcc=5V Load=150 Ω -20 Temperature (°C) 0 20 40 60 80 Temperature (°C) Figure 23. Output higher rail vs. temperature Figure 24. Output lower rail vs. temperature 50 4,2 45 4,1 40 VOL (V) VOH (V) 4,0 3,9 3,8 35 30 3,7 3,6 3,5 -40 25 Vcc=5V Load=150Ω -20 Vcc=5V Load=150Ω 0 20 40 Temperature (°C) 60 80 20 -40 -20 0 20 40 60 80 Temperature (°C) 9/17 Application information TSH344 3 Application information 3.1 Using the TSH344 to drive R-G-B video components Figure 25. Shapes of video signals coming from DACs White (100 IRE) 54ns (4t) 27ns (2t) 27ns (2t) 590ns (44t) 300mV 700mV Black (30 IRE) 300mV GND 1.030V 14.8µs (1100t): 1920*1080i 24.3µs (1800t): 1280*720i 590ns (44t) 10mV Synchronization tip •Fclock=74.25MHz •t=1/Fclock=13.5ns 0.330V (0 IRE) 0.030V time Amplitude 1Vp-p 30MHz Frequency Figure 26. TSH344 in single supply for HD video outputs DAC DAC DAC +5V R G 75Ω Cable LPF TSH344 75Ω LPF SO8 B 75Ω LPF Cable Cable Digital synchro HDTV video outputs DAC DAC DAC Note: 10/17 +5V Y,G(+synchro) Pb,B 75Ω TSH343 75Ω LPF SO8 Pr,R Cable LPF 75Ω LPF Cable Cable See the TSH343 datasheet on st.com for more information (the TSH343 is used to drive a video signal including a synchronization tip). TSH344 Application information Figure 27. Details on one channel of the TSH344 STB +5V TV + 100µF 10nF 75Ω 1/3 TSH344 (gain=2) DAC 470nH video line 75Ω External resistor. Load required by the DAC output specification 68pF 68pF 0V 5Volt 5Volt 2V 1V 1V 300mV 0Volt 600mV 0Volt Low output Rail : 60mV max. tested (see datasheet p.3: Vol) 300mV 0Volt Because of the shape of the signal described in Figure 25, we use a very low output rail triple high-speed buffer. The TSH344 supplied in 5V single power supply features a low output rail of 60mV (guaranteed by test) on 150Ω load. It is dedicated for driving RGB signals without synchronisation (in the case where the synchronization is provided digitally on the digital bus). The gain of the TSH344 (gain=2) is internal which makes it possible to remove two resistors on the BOM. To avoid any perturbation on matching from the DACs output impedance along a large band of 30MHz in HD, a discrete reconstruction filtering is implemented after the driver. This filter is matched on 75Ω. Note that the TSH344 uses a single supply architecture and it is not AC output coupled (it cannot sink an output current, therefore it is not possible to implement an output series capacitor). 11/17 Application information 3.2 TSH344 Power supply considerations Correct power supply bypassing is very important for optimizing performance in low and high-frequency ranges. Bypass capacitors should be placed as close as possible to the IC pin (pin 4) to improve high-frequency bypassing. A capacitor (CLF) greater than 100μF is necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor of 470nF (CHF) is also added as close as possible to the IC pin to improve the PSRR in the higher frequencies. Figure 28. Circuit for power supply bypassing +VCC CLF + CHF 4 R G B TSH344 5 Figure 29 shows how the power supply noise rejection evolves versus frequency depending on how carefully the power supply decoupling is achieved. Figure 29. Improvement of power supply noise rejection 0 -10 Vcc=5V Load=150Ω PSRR=20 log (ΔVCC/ΔVout) PSRR (dB) -20 without capacitor -30 -40 CLF=100uF CHF=470nF -50 -60 -70 -80 10k 100k 1M Frequency (Hz) 12/17 10M 100M TSH344 Delay between channels Figure 30. Measurement of the delay between each channel 5V 75Ω 75Ω Cable +6dB V1 75Ω Vin 75Ω 75Ω Cable +6dB V2 75Ω 75Ω 75Ω 75Ω Cable +6dB V3 75Ω The delay between each video component is an important aspect in high definition video systems. To properly drive the three video components without any relative delay, the layout of the TSH344 dice has a very symmetrical geometry. this has a direct effect on the synchronization of each channel, as shown in Figure 31. There is no delay detected between channels when the same Vin signal is applied on the three inputs. Note that the delay between the inputs and the outputs is equal to 4ns. 3 Output responses Figure 31. Relative delay between each channel Vcc=5V Load=150Ω Input 3.3 Application information -4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns Time 13/17 Package information 4 TSH344 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com. 14/17 TSH344 Package information Figure 32. SO-8 package mechanical data Dimensions Ref. Millimeters Min. Typ. A Inches Max. Min. Typ. 1.75 0.069 A1 0.10 A2 1.25 b 0.28 0.48 0.011 0.019 c 0.17 0.23 0.007 0.010 D 4.80 4.90 5.00 0.189 0.193 0.197 E 5.80 6.00 6.20 0.228 0.236 0.244 E1 3.80 3.90 4.00 0.150 0.154 0.157 e 0.25 Max. 0.004 0.010 0.049 1.27 0.050 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k 1° 8° 1° 8° ccc 0.10 0.004 15/17 Ordering information 5 TSH344 Ordering information Table 4. Order codes Part number Temperature range Package -40°C to +85°C SO-8 TSH344ID TSH344IDT 6 16/17 Packing Marking Tube TSH344I Tape & reel TSH344I Revision history Date Revision Changes Dec-2005 1 First release of datasheet. Jan-2006 2 Capa-load option paragraph deleted on page 11. Jul-2006 3 Application information. 14-Mar-2007 4 Updated Section 3.2: Power supply considerations on page 12. TSH344 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. 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