TSH103ID

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 Pin connections SO-8 plastic package Applications ■ ■ ■ Standard definition TV Set-top box DVD player/recorder IN2 2 IN1 1 + + + 6MHz LPF 6dB 8 OUT1 6MHz LPF 6dB 7 OUT2 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. 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. IN3 3 +Vcc 4 6MHz LPF 6dB 6 OUT3 5 GND DC shifter September 2007 Rev 1 1/10 www.st.com 10 Absolute maximum ratings TSH103 1 Absolute maximum ratings Table 1. Symbol VCC Absolute maximum ratings Parameter Value Unit Supply voltage (1) Maximum input voltage swing Operating free air temperature range Storage temperature Maximum junction temperature SO-8 thermal resistance junction to case SO-8 thermal resistance junction to ambient area HBM: human body model CDM: charged device model MM: machine model Output short-circuit 6 0 to 3 -40 to +85 -65 to +150 150 28 157 3.5 1.5 200 (2) V V °C °C °C °C/W °C/W kV kV V Vin Toper Tstg Tj Rthjc Rthja ESD 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 Value Unit Power supply voltage 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 Table 3. Symbol Electrical characteristics VCC = +5V single supply, Tamb = 25°C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit DC performance VDC Output DC shift RL = 150Ω -40°C < Tamb < +85°C 100 310 312 1.2 1.4 5.5 5.6 430 mV Iib Input bias current Vin= 0V -40°C < Tamb < +85°C μA ICC Supply current per channel Vin= 0.5V DC -40°C < Tamb < +85°C RL = 150Ω -40°C < Tamb < +85°C RL = 150Ω RL = 150Ω 7.1 mA 1.93 1.97 1.96 3.9 41 56 2 V/V V 46 mV mA G VOH VOL IOUT DC voltage gain High level output voltage Low level output voltage Isink/Isource Video performance -3dB bandwidth FCut Fatt gd dG dPh Noise Small signal, RL = 150Ω Small signal, RL = 150Ω Small signal, F= 27MHz 0 to 5MHz RL = 150Ω RL = 150Ω 5.1 9.4 MHz 7.4 37 10 0.5 0.5 dB ns % ° -1dB bandwidth Filter attenuation Group delay Differential gain Differential phase en Input voltage noise 100kHz 76 nV/VHz 3/10 Electrical characteristics TSH103 Figure 1. 10 5 0 -5 -10 -15 Frequency response Figure 2. 7.0 6.8 6.6 6.4 Gain flatness Gain (dB) -20 -25 -30 -35 -40 -45 -50 -55 -60 100k Gain (dB) Vcc = +4.5V, +5V, +5.5V Small signal Load = 150Ω 1M 10M 27MHz 6.2 6.0 5.8 5.6 5.4 5.2 5.0 100k Vcc = +4.5V, +5V, +5.5V Small signal Load = 150Ω 1M 10M 100M Frequency (Hz) Frequency (Hz) Figure 3. 10 5 0 -5 -10 -15 Frequency response (large signal) Figure 4. -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 0.0 Distortion H2 -20 -25 -30 -35 -40 -45 -50 -55 -60 100k Distortion (dB) Gain (dB) H3 Vcc = +4.5V, +5V, +5.5V Vout = 2Vp-p Load = 150Ω 1M 10M 100M Vcc = +5V Vicm = +0.5V F = 1MHz Load = 150Ω 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.5 Frequency (Hz) Output Amplitude (Vp-p) Figure 5. 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 0.5 Quiescent current vs. Supply Figure 6. 260 240 220 200 180 Input noise vs. frequency No load Input to GND Vcc=+5V en (nV/VHz) no input signal no load 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Icc (mA) 160 140 120 100 80 60 40 1k 10k 100k 1M Vcc (V) Frequency (Hz) 4/10 TSH103 Power supply considerations 4 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 + CHF=100nF CLF=100µF 4 IN1 IN2 IN3 TSH103 OUT1 OUT2 OUT3 5 Figure 8. Noise supply rejection 0 -10 Noise supply rejection (dB) -20 -30 -40 -50 -60 -70 -80 -90 -100 100k Vcc=+5Vdc+0.2Vac Load=150Ω C LF=100uF C HF=100nF 1M 10M Frequency (Hz) 5/10 Using the TSH103 to drive video signals TSH103 5 Using the TSH103 to drive video signals Figure 9. Video line interface implementation schematics +5V 1V 2.3V 2Vpp 1.15V 1Vpp 0.9V GND 1Vpp Video DAC Y 0.3V GND 75Ω 0.45V 75Ω Cable GND TV DAC load resistor 75Ω 1.4Vpp 0.7Vpp 1.15V 0.9V GND 2.3V 1V 0.7Vpp Video DAC Pb 0.3V GND TSH103 DAC load resistor 75Ω 75Ω Cable 0.45V GND 75Ω 1.4Vpp 0.7Vpp 1.15V 0.9V GND 2.3V 1V 0.7Vpp Video DAC Pr 0.3V GND 75Ω 75Ω Cable 0.45V GND DAC load resistor 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 DAC Black (300mV) GND Synchronization tip (close to zero volt) time 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 Y,G Pb,B,C Pr,B, CVBS R 75Ω 75Ω TSH103 TSH173 SO8 SO8 Cable Cable DAC TV R 75Ω Cable DAC R +5V DAC Y,G Pb,B,C Pr,B, CVBS R 220µF + 220µF 75Ω 75Ω 75Ω Cable DAC + R Cable TV TSH103 TSH173 SO8 SO8 220µF DAC + Cable R 1. Note that the TSH103 is input DC coupling only. It is not AC coupling. 7/10 Package information TSH103 6 Package information Figure 12. SO-8 package mechanical data Dimensions Ref. Min. Millimeters Typ. Max. Min. Inches Typ. Max. A A1 A2 B C D E e H h L k ddd 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 5.80 0.25 0.40 1.75 0.25 1.65 0.51 0.25 5.00 4.00 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.069 0.010 0.065 0.020 0.010 0.197 0.157 6.20 0.50 1.27 0.228 0.010 0.016 8° (max.) 0.244 0.020 0.050 0.1 0.04 8/10 TSH103 Ordering information 7 Ordering information Table 4. Order codes Temperature range Package Packaging Marking Part number TSH103ID TSH103IDT -40°C to +85°C -40°C to +85°C SO-8 SO-8 Tube Tape & reel TSH103I TSH103I 8 Revision history Date Revision Changes 19-Sep-2007 1 Initial release. 9/10 TSH103 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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