TSH345IDT

TSH345 Triple video buffer with selectable filter for HD and SD video applications Preliminary Data Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Selectable 6th order filtering of 36 MHz, 18 MHz and 9 MHz 5 V single-supply operation Internal input DC level shifter No input capacitor required 3 matched 6 dB amplifiers AC or DC output-coupled Very low harmonic distortion Specified for 150 Ω loads Data min. and max. are tested during production R2 in 2 G1 in 3 MUX SO14 TSSOP14 R1 in 1 MUX 36MHz 18MHz 9MHz LPF 14 Fs0 + 6dB 13 Fs1 12 R out Applications ■ ■ ■ ■ G2 in 4 36MHz 18MHz 9MHz LPF + 6dB 11 G out 10 B out High-end video systems MUX High definition TV (HDTV) Broadcast and graphic video Multimedia products B1 in 5 B2 in 6 +VCC 7 36MHz 18MHz 9MHz LPF + 6dB 9 Mux DC Shifter 8 GND Description The TSH345 is a triple single-supply video buffer featuring an internal gain of 6 dB and selectable filtering for HD and SD video outputs on 75 Ω video lines. The TSH345 is ideal to drive either Y-C, CVBS, Y-U-V, Y-Pb-Pr or R-G-B signals from video DAC outputs. The main advantage of this circuit is its input DC level shifter. It allows you to drive video signals on 75 Ω video lines without damage to the synchronization tip, and without either input or output capacitor while using a single 5 V power supply. The DC level shifter is internally fixed and optimized to keep the output video signals between low and high output rails in the best position for the greatest linearity. The TSH345 is available in the SO14 plastic package for optimum space-saving. May 2007 Rev 1 1/14 www.st.com 14 This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. Absolute maximum ratings and operating conditions TSH345 1 Table 1. Symbol VCC Vin Toper Tstg Tj Rthjc Absolute maximum ratings and operating conditions Absolute maximum ratings (AMR) Parameter Supply voltage (1) Input voltage range (2) Value 6 TBD -40 to +85 -65 to +150 150 22 32 125 110 1 1.1 200 2 200 Unit V V °C °C °C °C/W Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to case SO14 TSSOP14 Thermal resistance junction to ambient area SO14 TSSOP14 Maximum power dissipation (@Tamb = 25°C) for Tj = 150° C SO14 TSSOP14 CDM: charged device model HBM: human body model MM: machine model Rthja °C/W Pmax W V kV V ESD 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 +0.3 V. Table 2. Symbol VCC Operating conditions Parameter Power supply voltage Value 4.5 to 5.5(1) Unit V 1. Tested in full production with +5 V single power supply. 2/14 TSH345 Electrical characteristics 2 Electrical characteristics Table 3. Symbol DC performance Output DC shift , RL = 150 Ω Tamb -40° C < Tamb < +85° C Input bias current Tamb , input to GND -40° C < Tamb < +85° C Input resistance, Tamb Input capacitance, Tamb Total supply current No load, input to GND -40°C < Tamb < +85°C Power supply rejection ratio 20 log (ΔVout/ΔVCC) Input to GND, RL = 150 Ω ΔVCC : 100 mVp/F = 1 MHz, CLF = 470 nF, CHF = 100 µF DC voltage gain RL = 150Ω, Vin = 0.5V -40°C < Tamb < +85°C Variation of the DC voltage gain between inputs of 0.3 V and 1 V Input step from 0.3 V to 1 V Gain matching between 3 channels, input = 1 V Gain matching between 3 channels, input = 0.3 V 1.94 Electrical characteristics at VCC = +5 V single supply, Tamb = 25°C (unless otherwise specified) Test conditions Min. Typ. Max. Unit VDC 197 329 405 1.5 2.38 12.6 0.1 389 mV Iib Rin Cin ICC 0.85 2.9 µA GΩ pF 50.7 TBD 65 mA PSRR -70 dB G 1.99 2 0.2 0.5 0.5 2.02 V/V DG MG1 MG0.3 0.5 1 1 % % % Output characteristics High level output voltage RL = 150 Ω -40° C < Tamb < +85° C Low level output voltage(1) RL = 150 Ω -40° C < Tamb < +85° C Isource Tamb -40° C < Tamb < +85° C Isink -40° C < Tamb < +85° C 46 79 TBD 145 102 mA VOH 3.84 3.87 TBD 33 TBD 91 40 V VOL mV mA Iout 3/14 Electrical characteristics Table 3. Symbol Filtering Bandwidth F1 selected, small signal, VICM= 0.5 V, RL = 150 Ω 3 dB bandwidth 1 dB bandwidth Standard definition Flatness F1selected/F= 6 MHz, small signal, VICM = 0.5 V, RL = 150 Ω Attenuation F1 selected/F=27 MHz, small signal, VICM = 0.5 V, RL = 150 Ω Bandwidth F2 selected, small signal, VICM = 0.5 V, RL = 150 Ω 3 dB bandwidth 1 dB bandwidth 30 TSH345 Electrical characteristics at VCC = +5 V single supply, Tamb = 25°C (unless otherwise specified) (continued) Test conditions Min. Typ. Max. Unit 5.12 9.3 7.3 0.5 MHz dB 47 dB Standard definition Flatness with progressive F2 selected/F=12 MHz small signal, VICM = 0.5 V, scanning RL = 150 Ω Attenuation F2 selected/F=54 MHz, small signal, VICM = 0.5 V, RL = 150 Ω 10.4 21.5 18.2 0.36 MHz dB 34 42.7 dB Bandwidth F3 selected, small signal, VICM = 0.5 V, RL = 150 Ω 3 dB bandwidth 1 dB bandwidth High definition Flatness F3 selected/F=30 MHz, small signal, VICM = 0.5 V, RL = 150 Ω Attenuation F3 selected/F=74.25 MHz, small signal, VICM = 0.5 V, RL = 150 Ω D gd Δg ΔΦ Delay between each channel Group delay variation F1 selected/F=0 to 6 MHz Differential gain F1 selected/F=6 MHz, RL = 150 Ω Differential phase F1 selected/F=6 MHz, RL = 150 Ω 22 35.6 30.8 0.46 MHz dB TBD 36 0.5 10.3 0.5 0.5 dB ns ns % ° 4/14 TSH345 Table 3. Symbol Noise and distortion Total input voltage noise in Standard Definition F = 100 kHz, RIN = 50 Ω Total input voltage noise in High Definition F = 100 kHz, RIN = 50 Ω HD2 HD3 2nd harmonic distortion F1 selected/F=1 MHz, Vout = 2 Vp-p, RL = 150 Ω 3rd harmonic distortion F1 selected/F=1 MHz, Vout = 2 Vp-p, RL = 150 Ω Electrical characteristics Electrical characteristics at VCC = +5 V single supply, Tamb = 25°C (unless otherwise specified) (continued) Test conditions Min. Typ. Max. Unit 70 nV/√ Hz 93 -44 -63 dBc dBc eN Standby mode ISTBY Ton Toff Total current consumption in standby mode Fs1=1, Fs0=1 Time from standby to active mode Time from active to standby mode TBD 5 5 570 µA µs µs Fs1, Fs0 and Mux features Vhigh Vlow High level Low level 0.9 0.3 V V 1. Simulated data. Table 4. Fs1 0 0 1 1 Filter and standby settings, VCC = +5 V single supply, Tamb = 25°C Fs0 0 1 0 1 F3 F2 F1 Standby Settings Filtering for high definition (HD), 36 MHz Filtering for progressive video (PV), 18 MHz Filtering for standard definition (SD), 9 MHz TSH345 in standby mode Fs1 and Fs0 floating: forbidden (for proper behavior of the TSH345, the Fs1 and Fs0 pins must never be left floating) Table 5. Mux settings, VCC = +5 V single supply, Tamb = 25°C Mux 0 1 R1 G1 B1 R2 G2 B2 R1 G1 B1 Settings Video1 selected Video2 selected Video1 selected Floating MUX floating: forbidden (for proper behavior of the TSH345, the MUX pin must never be left floating) 5/14 Power supply considerations TSH345 3 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 100 µF is necessary to improve the PSRR in low frequencies. For better quality bypassing, you can add a capacitor of 470 nF (CHF), also placed as close as possible to the IC pin, to improve the PSRR in the higher frequencies. Figure 1. Circuit for power supply bypassing +VCC CLF + CHF 4 R in G in B in TSH345 R out G out B out 5 6/14 TSH345 Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components 4 Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components Figure 2. Implementation of the video driver on output video DACs +5V Video DAC Y 1Vpp Reconstruction Filtering LPF + +6dB 75Ω 75Ω Cable 1Vpp TV 75Ω 2Vpp Video DAC Pb 0.7Vpp Reconstruction Filtering LPF + +6dB 75Ω 75Ω Cable 0.7Vpp 75Ω 1.4Vpp Video DAC Pr 0.7Vpp Reconstruction Filtering LPF + +6dB TSH345 75Ω 75Ω Cable 0.7Vpp 75Ω 1.4Vpp -5V GND Figure 3. Shapes of video signals coming from DACs (example for a black picture) 54ns (4t) 27ns (2t) 27ns (2t) •Fclock=74.25MHz •t=1/Fclock=13.5ns 300mV Black (30IRE) 590ns (44t) HD 300mV 590ns (44t) 14.8us (1100t): 1920/1080i 24.3us (1800t): 1280/720i GND sync.tip 160ns 150ns Black (30IRE) SD 300mV 4.6us 64us GND sync.tip 7/14 Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components Figure 4. Flexibility of the TSH345 for SD and HD signals +5V TSH345 HD/PV/SD Y,G DAC 150Ω 75Ω 150Ω TV Cable 75Ω DAC Pb,B 150Ω 75Ω TSH345 TSSOP14 SO14 Cable 75Ω DAC Pr,R 150Ω 150Ω 75Ω Cable 75Ω 150Ω DAC Y,G Pb,B,C Pr,R,CVBS Mux Filter select Standby DAC DAC HD/PV/SD Y,G DAC 150Ω +5V 75Ω TV Cable 75Ω NC 75Ω DAC Pb,B,C 150Ω Cable 75Ω NC DAC Pr,R,CVBS 150Ω TSH345 TSSOP14 SO14 75Ω Cable 75Ω NC Mux (NC) Filter select Standby The TSH345 is used to drive either high definition video signals up to 30 MHz, or progessive and interlaced standard definition video signals on 75-ohm video lines. It can drive a large panel of signals like Y-C and CVBS, Y-U-V, Y-Pb-Pr and R-G-B where the bottom of the signal (the synchronization tip in the case of Y and CVBS signals) is close to zero volts. An internal input DC value is added to the video signal in order to shift the bottom from GND. The shift is not based on the average of the signal, but is an analog summation of a DC component to the video signal. Therefore, no input capacitors are required, which provides a real advantage in terms of cost and board space. Under these conditions, it is possible to drive the signal in single supply without any saturation of the driver against the lower rail. Because half of the signal is lost through output impedance matching, in order to properly drive the video line, the shifted signal is multiplied by a gain of 2 or +6 dB. 8/14 TSH345 Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components 4.1 Output capacitor The output can be either DC-coupled or AC-coupled. The output can be connected to the line via a 75-ohm resistor directly (see Figure 5). Or, an output capacitor can be used to remove any DC components in the load. Assuming the load is 150-ohm, a coupling capacitor of 220 µF can be used to provide a very low cut-off frequency close to 5 Hz (see Figure 6). Figure 5. DC output coupling (1 of 3 channels) +5V Video DAC 75Ω TSH345 75Ω Cable 150Ω 75Ω Figure 6. AC output coupling (1 of 3 channels) +5V Video DAC 75 TSH345 C=220µF + 75 Cable 150 CS 75 1. CS is a 100nF used to decrease the parasitic components of C in high frequencies. 2. The 75-ohm resistor must be as close as possible to the output of the driver to minimize the effect of parasitic capacitance. 9/14 Package information TSH345 5 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. 10/14 TSH345 Package information 5.1 SO-14 package Dimensions Ref. Min. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 8.55 5.8 1.27 7.62 4.0 5.3 1.27 0.68 8° (max.) 0.149 0.181 0.019 8.75 6.2 0.35 0.19 0.5 45° (typ.) 0.336 0.228 0.050 0.300 0.157 0.208 0.050 0.026 0.344 0.244 0.1 Millimeters Typ. Max. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 Min. Inches Typ. Max. 0.068 0.007 0.064 0.018 0.010 11/14 Package information TSH345 5.2 TSSOP14 package Dimensions Ref. Min. A A1 A2 b c D E E1 e K L1 0° 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8° 0.75 0° 0.018 0.024 1 Millimeters Typ. Max. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8° 0.030 0.004 0.039 Min. Inches Typ. Max. 0.047 0.006 0.041 0.012 0.0089 0.201 0.260 0.176 A A2 A1 b e K c L E D E1 PIN 1 IDENTIFICATION 1 12/14 TSH345 Ordering infomation 6 Ordering infomation Table 6. Order codes Temperature range -40°C to +85°C Package SO14 TSSOP14 Packing Tube Tape & reel Tape & reel Marking TSH345I TSH345I TSH345I Part number TSH345ID TSH345IDT TSH345IPT 7 Revision history Date 29-May-07 Revision 1 Changes Preliminary data, initial release. 13/14 TSH345 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. 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