TSH344IDT

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 IN1 1 6dB Pin connections (top view) Pin1 identification Top View 8 OUT1 Applications ■ ■ ■ ■ IN2 2 6dB 7 OUT2 High-end video systems High definition TV (HDTV) Broadcast and graphic video Multimedia products +Vcc 4 5 GND IN3 3 6dB 6 OUT3 Description 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. SO8 March 2007 Rev 4 1/17 www.st.com 17 Contents TSH344 Contents 1 2 3 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 3.2 3.3 Using the TSH344 to drive R-G-B video components . . . . . . . . . . . . . . . 10 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 5 6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 TSH344 Absolute maximum ratings and operating conditions 1 Absolute maximum ratings and operating conditions Table 1. Symbol Absolute maximum ratings (AMR) Parameter Value Unit VCC Vin Toper Tstg Tj Rthjc Rthja Pmax ESD Supply voltage (1) Input voltage range (2) 6 0 to +2 -40 to +85 -65 to +150 150 28 157 800 2 1.5 200 V V °C °C °C °C/W °C/W mW kV kV V 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=25°C) for Tj=150°C CDM: charged device model HBM: human body model MM: machine model 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 Operating conditions Parameter Value Unit VCC Power supply voltage (1) 3 to 5.5 V 1. Tested in full production at 0V/5V single power supply. 3/17 Electrical characteristics TSH344 2 Table 3. Symbol Electrical characteristics VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit DC performance VOS Output offset voltage(1) No load, Tamb -40°C < Tamb < +85°C -35 -8 -8.6 5.5 6 4 1 -90 10.1 10.3 +35 mV 16 Iib Rin Cin PSRR Input bias current Input resistance Input capacitance Power supply rejection ratio 20 log (ΔVCC/ΔVout)(2) Supply current per buffer Tamb, input to GND -40°C < Tamb < +85°C Tamb Tamb Input to GND, F=1MHz, ΔVCC=200mV No load, input to GND μA GΩ pF dB 13 mA ICC G MG1 MG0.3 -40°C < Tamb < +85°C DC voltage gain RL = 150Ω, Vin=1V 1.92 2 0.5 0.5 2.05 2 2 V/V % % Gain matching between 3 channels Input = 1V Gain matching between 3 channels Input = 0.3V Dynamic performance and output characteristics -3dB bandwidth Bw Gain flatness @ 0.1dB FPBW D SR VOH VOL Full power bandwidth Delay between each channel Slew rate (3) High level output voltage Low level output voltage Output current IOUT Output short circuit current (Isource) Small signal Vout=20mVp Vicm=0.6V, RL = 150Ω Small signal Vout=20mVp Vicm=0.6V, RL = 150Ω Vicm=0.6V, Vout = 2Vp-p, RL = 150Ω 0 to 30MHz Vicm=0.6V, Vout = 2Vp-p, RL = 150Ω RL = 150Ω RL = 150Ω Vout= 2Vp, Tamb -40°C < Tamb < +85°C 190 340 MHz 65 130 200 0.5 MHz ns V/μs V 60 mV mA 500 3.7 740 3.9 40 45 93 83 100 mA 4/17 TSH344 Table 3. Symbol Noise and distortion Electrical characteristics VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit F = 100kHz, Rin = 50Ω eN Total input voltage noise Rin = 50Ω Bw=30MHz Bw=100MHz Vout = 2Vp-p, RL = 150Ω F= 10MHz F= 30MHz Vout = 2Vp-p, RL = 150Ω F= 10MHz F= 30MHz 8 55 100 -57 -42 -72 -51 nV/√ Hz μVrms HD2 2nd harmonic distortion dBc HD3 3rd harmonic distortion 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 TSH344 Figure 1. 10 8 6 4 Frequency response Figure 2. 6,2 6,1 6,0 5,9 Gain flatness Gain (dB) 2 0 -2 -4 -6 -8 -10 1M Gain (dB) 5,8 5,7 5,6 5,5 5,4 Vcc=5V Load=150Ω 10M 100M 1G 5,3 5,2 1M Vcc=5V Load=150 Ω 10M 100M 1G Frequency (Hz) Frequency (Hz) Figure 3. 0 -10 -20 -30 Cross-talk vs. frequency (amp1) Figure 4. 0 Cross-talk vs. frequency (amp2) Small Signal Vcc=5V Load=150Ω -20 Small Signal Vcc=5V Load=150Ω Gain (dB) -50 -60 -70 -80 -90 -100 1M 1/2 Gain (dB) -40 -40 -60 2/1 1/3 -80 2/3 -100 1M 10M 100M 10M 100M Frequency (Hz) Frequency (Hz) Figure 5. 0 Cross-talk vs. frequency (amp3) Figure 6. Input noise vs. frequency Vcc=5V DC input = 1.5V (Battery) -20 Input Noise (nV/VHz) 3/2 100M Small Signal Vcc=5V Load=150Ω 100 Gain (dB) -40 -60 3/1 -80 10 -100 1M 10M Frequency (Hz) 10 100 1k 10k 100k 1M 10M Frequency (Hz) 6/17 TSH344 Distortion on 150Ω load - 10MHz Electrical characteristics Distortion on 100Ω load - 10MHz Figure 7. -30 -35 -40 -45 Figure 8. -30 -35 -40 -45 HD2 & HD3 (dBc) -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 HD3 HD2 HD2 & HD3 (dBc) -50 Vcc=5V F=10MHz input DC component = 1.15V Load=150Ω -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0,0 Vcc=5V F=10MHz input DC component = 1.15V Load=100 Ω HD2 HD3 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 Output Amplitude (Vp-p) Output Amplitude (Vp-p) Figure 9. -10 -15 -20 -25 Distortion on 150Ω load - 30MHz Figure 10. Distortion on 100Ω load - 30MHz -10 -15 -20 -25 HD2 & HD3 (dBc) -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 HD3 HD2 HD2 & HD3 (dBc) -30 Vcc=5V F=30MHz input DC component = 1.15V Load=150 Ω -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 0,0 Vcc=5V F=30MHz input DC component = 1.15V Load=100 Ω HD2 HD3 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 Output Amplitude (Vp-p) Output Amplitude (Vp-p) Figure 11. Output current 0 -10 -20 -30 Isource +5V VOH without load Figure 12. Slew rate 4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5 Isource (mA) -40 -50 -60 -70 -80 -90 -100 -110 -120 0,0 0V V Output Response (V) SR+ SR- Vcc=5V Load=150Ω -2 -1 0 1 2 3 4 5 6 7 8 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 V (V) Time (ns) 7/17 Electrical characteristics TSH344 Figure 13. Reverse isolation vs. frequency 0 -10 -20 Figure 14. Output swing vs. frequency 5 Vcc=5V Load=150Ω 4 Gain (dB) -40 -50 -60 -70 -80 -90 -100 1M Vout max. (Vp-p) -30 3 2 1 Vcc=5V Load=100Ω or Load=150Ω 10M 100M 0 1M 10M 100M Frequency (Hz) Frequency (Hz) Figure 15. Quiescent current vs. supply 30 Figure 16. Output swing vs. supply 5 25 Vcc=5V no load 4 Total Icc (mA) 20 Vout peak-peak (Vp-p) 3 15 2 10 1 5 Vcc=5V F=30MHz Load=100 Ω o r 150 Ω 3,25 3,50 3,75 4,00 4,25 4,50 4,75 5,00 0 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 0 3,00 Vcc (V) Vcc (V) Figure 17. Bandwidth vs. temperature 500 450 400 Figure 18. Voltage gain vs. temperature 2,05 2,04 2,03 2,02 Bw (MHz) Gain (dB) Vcc=5V Load=150Ω -20 0 20 40 60 80 350 300 250 200 2,01 2,00 1,99 1,98 1,97 150 100 -40 1,96 1,95 -40 Vcc=5V Load=150Ω -20 0 20 40 60 80 Temperature (°C) Temperature (°C) 8/17 TSH344 Electrical characteristics Figure 19. Ibias vs. temperature 2 Figure 20. Gain matching vs. temperature 1,0 Vcc=5V Load=150 Ω 3 0,8 Gain Matching between 3 channels Vcc=5V Load=150Ω Vin=0.3V and 1V IBIAS (μA) 5 GM (%) -20 0 20 40 60 80 4 0,6 0,4 6 0,2 7 -40 0,0 -40 -20 0 20 40 60 80 Temperature (°C) Temperature (°C) Figure 21. Supply current vs. temperature 12 Figure 22. Output current vs. temperature 110 11 100 ICC (mA) 10 Isource (mA) Vcc=5V no Load 90 80 9 70 8 60 Vcc=5V Load=150 Ω -20 0 20 40 60 80 7 -40 -20 0 20 40 60 80 50 -40 Temperature (°C) Temperature (°C) Figure 23. Output higher rail vs. temperature 4,2 Figure 24. Output lower rail vs. temperature 50 4,1 45 4,0 40 VOH (V) 3,9 3,8 VOL (V) Vcc=5V Load=150Ω -20 0 20 40 60 80 35 30 3,7 25 3,6 Vcc=5V Load=150Ω 20 -40 -20 0 20 40 60 80 3,5 -40 Temperature (°C) Temperature (°C) 9/17 Application information TSH344 3 3.1 Application information Using the TSH344 to drive R-G-B video components Figure 25. Shapes of video signals coming from DACs White (100 IRE) 1.030V 27ns (2t) 54ns (4t) 27ns (2t) 590ns (44t) 300mV 700mV Black (30 IRE) 0.330V 300mV 590ns (44t) 14.8µs (1100t): 1920*1080i 24.3µs (1800t): 1280*720i GND 10mV (0 IRE) 0.030V time Synchronization tip •Fclock=74.25MHz •t=1/Fclock=13.5ns Amplitude 1Vp-p 30MHz Frequency Figure 26. TSH344 in single supply for HD video outputs DAC +5V R G B TSH344 SO8 75Ω Cable LPF 75Ω DAC LPF 75Ω Cable DAC LPF Digital synchro Cable HDTV video outputs DAC +5V Y,G(+synchro) Pb,B Pr,R TSH343 SO8 75Ω Cable LPF 75Ω DAC LPF 75Ω Cable DAC LPF Cable Note: See the TSH343 datasheet on st.com for more information (the TSH343 is used to drive a video signal including a synchronization tip). 10/17 TSH344 Figure 27. Details on one channel of the TSH344 +5V + 100µF 10nF Application information STB TV DAC External resistor. Load required by the DAC output specification 1/3 TSH344 (gain=2) 75Ω 470nH video line 75Ω 68pF 68pF 0V 5Volt 5Volt 2V 1V 300mV 0Volt 1V 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 TSH344 3.2 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 -20 -30 -40 -50 -60 -70 -80 10k Vcc=5V Load=150Ω PSRR=20 log (ΔVCC/ΔVout) without capacitor PSRR (dB) CLF=100uF CHF=470nF 100k 1M 10M 100M Frequency (Hz) 12/17 TSH344 Application information 3.3 Delay between channels Figure 30. Measurement of the delay between each channel 5V 75Ω +6dB 75Ω Cable V1 75Ω Vin +6dB 75Ω 75Ω 75Ω Cable V2 75Ω 75Ω +6dB 75Ω Cable 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. Figure 31. Relative delay between each channel 3 Output responses Vcc=5V Load=150Ω Input -4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns Time 13/17 Package information TSH344 4 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 Figure 32. SO-8 package mechanical data Dimensions Ref. Min. Millimeters Typ. Max. Min. Package information Inches Typ. Max. A A1 A2 b c D E E1 e h L k ccc 0.25 0.40 1° 0.10 1.25 0.28 0.17 4.80 5.80 3.80 4.90 6.00 3.90 1.27 1.75 0.25 0.004 0.049 0.48 0.23 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 0.193 0.236 0.154 0.050 0.50 1.27 8° 0.10 0.010 0.016 1° 0.069 0.010 0.019 0.010 0.197 0.244 0.157 0.020 0.050 8° 0.004 15/17 Ordering information TSH344 5 Ordering information Table 4. Order codes Temperature range Package Packing Marking Part number TSH344ID -40°C to +85°C TSH344IDT SO-8 Tube Tape & reel TSH344I TSH344I 6 Revision history Date Revision Changes Dec-2005 Jan-2006 Jul-2006 14-Mar-2007 1 2 3 4 First release of datasheet. Capa-load option paragraph deleted on page 11. Application information. Updated Section 3.2: Power supply considerations on page 12. 16/17 TSH344 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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