TSH103 Low cost triple video buffer/filter for standard video Features ■ Triple channels ■ Internal 6MHz-reconstruction filter (4th order) ■ 6dB-gain buffer for 75Ω lines ■ 5V single supply ■ Bottom of video signal close to 0V ■ Data min. and max. are physically tested and guaranteed during production SO-8 plastic package Pin connections Applications ■ Standard definition TV ■ Set-top box ■ DVD player/recorder IN1 1 + 6MHz LPF 6dB 8 OUT1 IN2 2 + 6MHz LPF 6dB 7 OUT2 IN3 3 + 6MHz LPF 6dB 6 OUT3 Description The TSH103 is a low cost video buffer. It is dedicated to drive video signals from any video DACs output on 75Ω video lines in standard definition. With a real benefit in terms of integration and cost saving, this product is particularly efficient for the replacement of current discrete solutions using transistors, coil and capacitors for buffering and filtering. +Vcc 4 DC shifter 5 GND This triple channel is designed to drive either CVBS/Y-C or RGB or YPbPr or YUV formats. Each channel features an internal 6MHz reconstruction filter and a 6dB buffer (attenuation of 27MHz sampling and good output impedance matching with the video line). The TSH103 requires a single 5V power supply. It is available in SO-8 plastic package. September 2007 Rev 1 1/10 www.st.com 10 Absolute maximum ratings 1 TSH103 Absolute maximum ratings Table 1. Absolute maximum ratings Symbol Parameter VCC Supply voltage (1) Vin Maximum input voltage swing Value Unit 6 V 0 to 3 V Toper Operating free air temperature range -40 to +85 °C Tstg Storage temperature -65 to +150 °C Maximum junction temperature 150 °C Rthjc SO-8 thermal resistance junction to case 28 °C/W Rthja SO-8 thermal resistance junction to ambient area 157 °C/W ESD HBM: human body model CDM: charged device model MM: machine model 3.5 1.5 200 kV kV V Tj Output short-circuit (2) 1. All voltage values 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 Unit 4.5 to 5.5 (1) V 1. This range is guaranteed by design (the product is tested in full production at 5V single power supply). 2/10 TSH103 Electrical characteristics 3 Electrical characteristics Table 3. VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. 100 310 430 Unit DC performance VDC Output DC shift Iib Input bias current ICC Supply current per channel G DC voltage gain RL = 150Ω mV -40°C < Tamb < +85°C 312 Vin= 0V 1.2 -40°C < Tamb < +85°C 1.4 Vin= 0.5V DC 5.5 -40°C < Tamb < +85°C 5.6 RL = 150Ω μA 7.1 mA 1.93 1.97 2 V/V -40°C < Tamb < +85°C 1.96 VOH High level output voltage RL = 150Ω 3.9 VOL Low level output voltage RL = 150Ω 41 IOUT Isink/Isource 56 V 46 mV mA Video performance -3dB bandwidth Small signal, RL = 150Ω -1dB bandwidth Small signal, RL = 150Ω Fatt Filter attenuation Small signal, F= 27MHz 37 dB gd Group delay 0 to 5MHz 10 ns dG Differential gain RL = 150Ω 0.5 % dPh Differential phase RL = 150Ω 0.5 ° Input voltage noise 100kHz 76 nV/VHz FCut 9.4 MHz 5.1 7.4 Noise en 3/10 Electrical characteristics Figure 1. TSH103 Frequency response Figure 2. Gain flatness 7.0 10 5 6.8 0 -5 6.6 -10 6.4 Gain (dB) Gain (dB) -15 -20 -25 -30 6.2 6.0 5.8 -35 5.6 -40 -45 -50 -55 5.4 Vcc = +4.5V, +5V, +5.5V Small signal Load = 150Ω -60 100k 5.2 1M 10M 5.0 100k 100M 27MHz Vcc = +4.5V, +5V, +5.5V Small signal Load = 150Ω 1M Frequency (Hz) Figure 3. 10M Frequency (Hz) Frequency response (large signal) Figure 4. Distortion -40 10 5 -45 0 -50 -5 Distortion (dB) -10 Gain (dB) -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 10M -90 0.0 100M Quiescent current vs. Supply Figure 6. 6.0 260 5.5 240 5.0 220 4.5 1.5 2.0 2.5 3.0 3.5 4.0 Input noise vs. frequency No load Input to GND Vcc=+5V 180 en (nV/VHz) Icc (mA) 1.0 200 4.0 3.5 3.0 2.5 2.0 160 140 120 100 1.5 80 no input signal no load 1.0 0.5 0.5 1.0 1.5 2.0 2.5 3.0 Vcc (V) 4/10 0.5 Output Amplitude (Vp-p) Frequency (Hz) 0.0 0.0 Vcc = +5V Vicm = +0.5V F = 1MHz Load = 150Ω -85 1M Figure 5. H3 -80 Vcc = +4.5V, +5V, +5.5V Vout = 2Vp-p Load = 150Ω -60 100k H2 -55 3.5 4.0 4.5 5.0 60 5.5 40 1k 10k 100k Frequency (Hz) 1M TSH103 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 of 100µF is necessary to minimize the power supply noise in low frequency. For better quality bypassing, we recommend to add a CMS 100nF capacitor, also placed as close as possible to the IC pins. Figure 7. Circuit for power supply bypassing +VCC CLF=100µF + CHF=100nF 4 IN1 IN2 IN3 TSH103 OUT1 OUT2 OUT3 5 Figure 8. Noise supply rejection 0 -10 Noise supply rejection (dB) 4 Power supply considerations -20 -30 Vcc=+5Vdc+0.2Vac Load=150Ω C LF=100uF C HF=100nF -40 -50 -60 -70 -80 -90 -100 100k 1M 10M Frequency (Hz) 5/10 Using the TSH103 to drive video signals 5 TSH103 Using the TSH103 to drive video signals Figure 9. Video line interface implementation schematics +5V 2Vpp 2.3V 1Vpp 1V 1.15V 1Vpp 0.9V 0.45V Video DAC Y 0.3V GND 75Ω Cable DAC load resistor Pb 1.4Vpp 0.7Vpp 0.7Vpp 1V 1.15V 0.9V 0.3V GND 75Ω GND 75Ω Cable DAC load resistor 1V 75Ω 1.4Vpp 0.7Vpp 0.7Vpp 1.15V 0.9V Pr 0.45V GND TSH103 2.3V Video DAC TV GND 75Ω 2.3V Video DAC 75Ω GND 0.3V GND GND 75Ω 75Ω Cable DAC load resistor 0.45V GND 75Ω The bottom of the synchronization tip at the DAC output can be as low as 0mV. In that case, the bottom is equal to 310mV typical at the TSH103 output (see values of the output DC shift in Table 3). The Y signal can be properly driven by the TSH103 because its low output rail (VOL) is lower than 46mV (Table 3). Figure 10. Details on Y or G or CVBS for synchronization tip Amplitude White (1V) Y signal DAC Black (300mV) GND time Synchronization tip (close to zero volt) 6/10 TSH103 Using the TSH103 to drive video signals The interface is illustrated in Figure 11. It is composed of: ● Three 75-ohm resistors ● Three matching resistors ● One 10µF power supply decoupling capacitor ● One 10nF power supply decoupling capacitor Figure 11. Implementation of the TSH103 (output DC and AC coupling) +5V DAC DAC DAC Y,G Pb,B,C Pr,B, CVBS R R TSH173 TSH103 SO8 SO8 75Ω Cable 75Ω Cable 75Ω Cable 75Ω Cable 75Ω Cable 75Ω Cable TV R +5V DAC DAC DAC 220µF Y,G Pb,B,C Pr,B, CVBS + R 220µF + R TSH173 TSH103 SO8 SO8 220µF + TV R 1. Note that the TSH103 is input DC coupling only. It is not AC coupling. 7/10 Package information 6 TSH103 Package information Figure 12. SO-8 package mechanical data Dimensions Ref. Millimeters Min. Typ. Inches Max. Min. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8/10 Typ. 8° (max.) 0.1 0.04 TSH103 7 Ordering information Ordering information Table 4. 8 Order codes Part number Temperature range Package Packaging Marking TSH103ID -40°C to +85°C SO-8 Tube TSH103I TSH103IDT -40°C to +85°C SO-8 Tape & reel TSH103I Revision history Date Revision 19-Sep-2007 1 Changes Initial release. 9/10 TSH103 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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