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 Pin connections (top view) ■ Very low harmonic distortion ■ Slew rate: 740V/ms Pin1 identification ■ Specified for 150Ω and 100Ω loads Top View ■ Tested on 5V power supply ■ Min. and max. data tested during production IN1 1 6dB 8 OUT1 Applications IN2 2 6dB 7 OUT2 ■ High-end video systems ■ High definition TV (HDTV) IN3 3 6dB 6 OUT3 ■ Broadcast and graphic video +Vcc 4 5 GND ■ Multimedia products 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 Absolute maximum ratings and operating conditions 1 Absolute maximum ratings and operating conditions T able 1. Absolute maximum ratings (AMR) Symbol Parameter Value Unit V Supply voltage (1) 6 V CC V Input voltage range (2) 0 to +2 V in T Operating free air temperature range -40 to +85 °C oper T Storage temperature -65 to +150 °C stg T Maximum junction temperature 150 °C j R SO8 thermal resistance junction to case 28 °C/W thjc R SO8 thermal resistance junction to ambient area 157 °C/W thja P Maximum power dissipation (@T =25°C) for T=150°C 800 mW max amb j CDM: charged device model 2 kV ESD HBM: human body model 1.5 kV MM: machine model 200 V 1. All voltage values, except differential voltage, are with respect to network terminal. 2. The magnitude of input and output voltage must never exceed V +0.3V. CC T able 2. Operating conditions Symbol Parameter Value Unit V Power supply voltage (1) 3 to 5.5 V CC 1. Tested in full production at 0V/5V single power supply. 3/17

Electrical characteristics TSH344 2 Electrical characteristics Table 3. V =+5V single supply, T =25°C (unless otherwise specified) CC amb Symbol Parameter Test conditions Min. Typ. Max. Unit DC performance No load, T -35 -8 +35 V Output offset voltage(1) amb mV OS -40°C < T < +85°C -8.6 amb T , input to GND 5.5 16 I Input bias current amb μA ib -40°C < T < +85°C 6 amb R Input resistance T 4 GΩ in amb C Input capacitance T 1 pF in amb Power supply rejection ratio Input to GND, F=1MHz, PSRR -90 dB 20 log (ΔV /ΔV )(2) ΔV =200mV CC out CC No load, input to GND 10.1 13 ICC Supply current per buffer mA -40°C < T < +85°C 10.3 amb G DC voltage gain R = 150Ω, V =1V 1.92 2 2.05 V/V L in MG1 Gain matching between 3 channels Input = 1V 0.5 2 % MG0.3 Gain matching between 3 channels Input = 0.3V 0.5 2 % Dynamic performance and output characteristics Small signal V =20mVp -3dB bandwidth out 190 340 V =0.6V, R = 150Ω icm L Bw MHz Small signal V =20mVp Gain flatness @ 0.1dB out 65 V =0.6V, R = 150Ω icm L V =0.6V, V = 2Vp-p, FPBW Full power bandwidth icm out 130 200 MHz R = 150Ω L D Delay between each channel 0 to 30MHz 0.5 ns V =0.6V, V = 2Vp-p, SR Slew rate (3) icm out 500 740 V/μs R = 150Ω L V High level output voltage R = 150Ω 3.7 3.9 V OH L V Low level output voltage R = 150Ω 40 60 mV OL L V = 2Vp, T 45 93 out amb Output current mA -40°C < T < +85°C 83 I amb OUT Output short circuit current 100 mA (I ) source 4/17

TSH344 Electrical characteristics Table 3. V =+5V single supply, T =25°C (unless otherwise specified) CC amb Symbol Parameter Test conditions Min. Typ. Max. Unit Noise and distortion F = 100kHz, R = 50Ω 8 nV/√Hz in eN Total input voltage noise Rin = 50Ω Bw=30MHz 55 μVrms Bw=100MHz 100 V = 2Vp-p, R = 150Ω out L HD2 2nd harmonic distortion F= 10MHz -57 dBc F= 30MHz -42 V = 2Vp-p, R = 150Ω out L HD3 3rd harmonic distortion F= 10MHz -72 dBc F= 30MHz -51 1. Output offset voltage is determined by the following expression: V =G.V +V . OUT IN OS 2. See Figure28 and Figure29. 3. Non-tested value, guaranteed by design and evaluation. See Figure12. 5/17

Electrical characteristics TSH344 Figure 1. F requency response Figure 2. Gain flatness 10 6,2 8 6,1 6 6,0 4 5,9 B) 2 B)5,8 d d n ( 0 n (5,7 ai ai G -2 G5,6 -4 5,5 -6 5,4 -8 Vcc=5V 5,3 Vcc=5V Load=150Ω Load=150Ω -10 5,2 1M 10M 100M 1G 1M 10M 100M 1G Frequency (Hz) Frequency (Hz) Figure 3. Cross-talk vs. frequency (amp1) Figure 4. Cross-talk vs. frequency (amp2) 0 0 Small Signal Small Signal -10 Vcc=5V Vcc=5V -20 Load=150Ω -20 Load=150Ω -30 B) -40 B) -40 d d n ( -50 n ( Gai -60 1/2 Gai -60 2/1 -70 -80 1/3 -80 2/3 -90 -100 -100 1M 10M 100M 1M 10M 100M Frequency (Hz) Frequency (Hz) Figure 5. Cross-talk vs. frequency (amp3) Figure 6. Input noise vs. frequency 0 Vcc=5V Small Signal DC input = 1.5V (Battery) Vcc=5V -20 Load=150Ω Hz) V 100 V/ n dB) -40 e ( n ( ois Gai -60 3/1 ut N p n I -80 3/2 10 -100 1M 10M 100M 10 100 1k 10k 100k 1M 10M Frequency (Hz) Frequency (Hz) 6/17

TSH344 Electrical characteristics Figure 7. D istortion on 150Ω load - 10MHz Figure 8. Distortion on 100Ω load - 10MHz -30 -30 -35 Vcc=5V -35 Vcc=5V -40 F=10MHz -40 F=10MHz -45 input DC component = 1.15V -45 input DC component = 1.15V Load=150Ω Load=100Ω -50 -50 c) c) B -55 B -55 d d 3 ( -60 3 ( -60 D -65 D -65 & H -70 HD2 & H -70 2 -75 2 -75 HD2 D D H -80 H -80 -85 -85 HD3 -90 HD3 -90 -95 -95 -100 -100 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 0,0 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. D istortion on 150Ω load - 30MHz Figure 10. Distortion on 100Ω load - 30MHz -10 -10 -15 Vcc=5V -15 Vcc=5V -20 F=30MHz -20 F=30MHz -25 input DC component = 1.15V -25 input DC component = 1.15V Load=150Ω Load=100Ω -30 -30 c) c) B-35 B-35 d d 3 (-40 3 (-40 D-45 D-45 H H & -50 & -50 2 -55 HD2 2 -55 HD2 D D H-60 H-60 -65 -65 -70 HD3 -70 HD3 -75 -75 -80 -80 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 0,0 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 Figure 12. Slew rate 0 4,0 -10 +5V -20 VwiOthHo utload 3,5 -30 3,0 SR+ Isource V) A) -40 V se ( 2,5 m -50 n e ( -60 0V spo 2,0 c e Isour --8700 put R 1,5 SR- ut -90 O 1,0 -100 Vcc=5V 0,5 -110 Load=150Ω -120 0,0 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 -2 -1 0 1 2 3 4 5 6 7 8 V (V) Time (ns) 7/17

Electrical characteristics TSH344 Figure 13. R everse isolation vs. frequency Figure 14. Output swing vs. frequency 0 5 Vcc=5V -10 Load=150Ω -20 4 -30 p) p- B) -40 V 3 n (d -50 ax. ( Gai -60 ut m 2 o -70 V -80 1 Vcc=5V -90 Load=100Ω or Load=150Ω -100 0 1M 10M 100M 1M 10M 100M Frequency (Hz) Frequency (Hz) Figure 15. Quiescent current vs. supply Figure 16. Output swing vs. supply 30 5 Vcc=5V no load 25 4 p) mA) 20 k (Vp- 3 c ( 15 pea al Ic eak- 2 Tot 10 ut p o V 1 Vcc=5V 5 F=30MHz Load=100Ω or 150Ω 0 0 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 3,00 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 500 2,05 2,04 450 2,03 400 2,02 350 z) B) 2,01 H d w (M 300 ain ( 2,00 B 250 G 1,99 1,98 200 1,97 150 Vcc=5V Vcc=5V 1,96 Load=150Ω Load=150Ω 100 1,95 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 Temperature (°C) Temperature (°C) 8/17

TSH344 Electrical characteristics Figure 19. I vs. temperature Figure 20. Gain matching vs. temperature bias 2 1,0 Vcc=5V Load=150Ω Gain Matching between 3 channels Vcc=5V 3 0,8 Load=150Ω Vin=0.3V and 1V 4 0,6 A) %) μ (BIAS 5 GM ( 0,4 I 6 0,2 7 0,0 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 Temperature (°C) Temperature (°C) Figure 21. Supply current vs. temperature Figure 22. Output current vs. temperature 12 110 100 11 90 A) 10 mA) I (mCC 9 urce ( 80 o Is 70 8 Vcc=5V 60 Vcc=5V no Load Load=150Ω 7 50 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 Temperature (°C) Temperature (°C) Figure 23. Output higher rail vs. temperature Figure 24. Output lower rail vs. temperature 50 4,2 45 4,1 4,0 40 V) 3,9 V) (OH (OL 35 V 3,8 V 30 3,7 25 3,6 Vcc=5V Vcc=5V Load=150Ω Load=150Ω 3,5 20 -40 -20 0 20 40 60 80 -40 -20 0 20 40 60 80 Temperature (°C) 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) 1.030V 54ns 27ns (4t) (2t) 27ns (2t) 590ns (44t) 300mV 700mV Black (30 IRE) 0.330V 300mV 590ns 14.8µs (1100t): 1920*1080i (44t) 24.3µs (1800t): 1280*720i (0 IRE) 0.030V 10mV GND Synchronization tip •Fclock=74.25MHz time (cid:129)t=1/Fclock=13.5ns Amplitude 1Vp-p Frequency 30MHz Figure 26. TSH344 in single supply for HD video +5V outputs R 75Ω Cable DAC LPF G TSH344 75Ω Cable DAC LPF SO8 B 75Ω Cable DAC LPF Digital synchro HDTV video +5V outputs Y,G(+synchro) 75Ω Cable DAC LPF Pb,B TSH343 75Ω Cable DAC LPF SO8 Pr,R 75Ω Cable DAC LPF 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 Application information Figure 27. Details on one channel of the TSH344 STB TV +5V + 100µF 10nF DAC 1/3 TSH344 75Ω 470nH video line (gain=2) 75Ω Externalresistor. 68pF 68pF Loadrequiredby theDAC output specification 0V 5Volt 5Volt 2V 1V 1V 600mV 300mV Lowoutput Rail : 300mV 0Volt 0Volt 60mVmax. tested 0Volt (seedatasheetp.3: Vol) Because of the shape of the signal described in Figure25, 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 (C ) greater than 100μF is LF necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor of 470nF (C ) is also added as close as possible to the IC pin to improve the PSRR in the HF higher frequencies. Figure 28. Circuit for power supply bypassing +VCC C LF + C HF 4 R G TSH344 B 5 Figure29 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 Vcc=5V -10 Load=150Ω PSRR=20 log (ΔVCC/ΔVout) -20 without B) -30 capacitor d R ( -40 R PS -50 CLF=100uF C =470nF HF -60 -70 -80 10k 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 75ΩCable +6dB V1 75Ω Vin 75Ω 75ΩCable +6dB V2 75Ω 75Ω 75Ω 75ΩCable +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 Figure31. There is no delay detected between channels when the same V signal is applied on the three inputs. Note that the in delay between the inputs and the outputs is equal to 4ns. Figure 31. Relative delay between each channel s e s n o p s e r ut p ut O 3 ut VLocac=d=5V150Ω p n I -4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns Tim e 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 Package information Figure 32. SO-8 package mechanical data Dimensions Ref. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A 1.75 0.069 A1 0.10 0.25 0.004 0.010 A2 1.25 0.049 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 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 TSH344 5 Ordering information T a ble 4. Order codes Part number Temperature range Package Packing Marking TSH344ID Tube TSH344I -40°C to +85°C SO-8 TSH344IDT Tape & reel TSH344I 6 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 Section3.2: Power supply considerations on page12. 16/17

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