TSH173ID

TSH173 Triple video buffer with filter for SD video Features ■ 4.5V to 5.5V single supply operation ■ R-G-B, Y-Pb-Pr, Y-C-CVBS driving ■ 3 channels with 6dB gain buffer ■ 3 video reconstruction filters for SD ■ 3 internal input DC level shifter ■ No input capacitor is required ■ Very low harmonic distortion ■ Each output can drive AC- or DC-coupled 150Ω loads ■ Tested on 5V power supply ■ Data min. and max. are tested during production Pin connections (top view) IN1 1 8.2MHz 5th order 6dB 8 OUT1 IN2 2 8.2MHz 5th order 6dB 7 OUT2 IN3 3 8.2MHz 5th order 6dB 6 OUT3 Applications ■ Set top boxes ■ DVD players/recorders ■ High-end video systems ■ Standard definition TV (SD) ■ Multimedia products DC Shifter 5 GND +Vcc 4 SO8 Description The TSH173 is a single supply triple video buffer featuring an internal gain of 6dB and an internal low pass filter of 8.2MHz cut-off frequency for each channel to fit with Standard Definition requirements for video line interfaces. This datasheet gives technical information on using the TSH173 as a R-G-B, Y-Pb-Pr, or Y-CCVBS driver for video DAC outputs on a video line. The TSH173 is available in SO8 plastic package. Another advantage of the TSH173 is its input DC level shifter to drive the video signal on a 75Ω video line without any damage to the synchronization tip, while using a single 5V power supply with no input capacitor. The DC level shifter is internally fixed and optimized to keep the output video signal between low and high output rails in the best position to improve linearity. March 2007 Rev 1 1/13 www.st.com 13 Contents TSH173 Contents 1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.1 Synchronization tip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Using the TSH173 to drive video components . . . . . . . . . . . . . . . . . . . 10 5 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2/13 TSH173 1 Absolute maximum ratings Absolute maximum ratings Table 1. Absolute maximum ratings Symbol VCC Parameter Value Unit 6 V Supply voltage (1) Toper Operating free air temperature range -40 to +85 °C Tstg Storage temperature -65 to +150 °C Maximum junction temperature 150 °C Rthjc SO8 thermal resistance junction to case 28 °C/W Rthja SO8 thermal resistance junction to ambient area 157 °C/W Pmax. Maximum power dissipation (@Tamb=25°C) for Tj=150°C 800 mW ESD CDM: charged device model HBM: human body model MM: machine model 1.5 2 200 kV kV V Tj Output short-circuit (2) 1. All voltage values, except differential voltage, 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. Tested in full production at 0V/5V single power supply. 3/13 Electrical characteristics TSH173 3 Electrical characteristics Table 3. VCC = +5V single supply, load: RL = 150Ω, Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. 0.6 0.9 1.2 Unit DC performance VDC Iib Output DC shift V -40°C < Tamb < +85°C Input bias current PSRR Power supply rejection ratio 20 log (∆Vcc/∆Vout) ICC Supply current per channel 0.95 VCC=+5V, Vicm=100mV 3 -40°C < Tamb < +85°C 5 VCC=+5V, ∆VCC=200mVp-p, F=1MHz (without any improvement of the power supply noise rejection) 37 Vicm=100mV, no load 7.4 -40°C < Tamb < +85°C 8 dB 9 2 2.05 DC voltage gain V/V -40°C < Tamb < +85°C GM Gain matching VOH High level output voltage VOL Low level output voltage 1.95 0.5 3.3 2 % 3.8 V 210 mV Isink Vin=0.5V DC Vout is fixed by a generator at 2.5V 25 34 Isource Vin=0.5V DC Vout is fixed by a generator at 1V -28 -38 IOUT µA mA 1.95 G 6 mA Dynamic performance (5th order filter) FC-SD Fatt Flatness -3dB bandwidth Small signal Small signal Large signal (Vout=2Vp-p) 5.5 5 6.5 6.3 MHz -1dB bandwidth Filter attenuation Small signal, F=27MHz 40 50 dB +/-0.1 dB Gain flatness along a 4.5MHz 10kHz to 4.5MHz band Vout=2Vp-p 8.2 gd Group delay 0 to 6MHz 17 ns D Delay between each channel 0 to 6MHz 0.5 ns dG Differential gain 0.6 % dPh Differential phase 0.15 ° 62 dB Noise SNR 4/13 Signal-to-noise ratio Bw = 10kHz to 6MHz TSH173 Electrical characteristics 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 100k Frequency response Figure 2. Gain flatness 6.5 6.4 6.3 6.2 Flatness (dB) Gain (dB) Figure 1. 6.1 6.0 5.9 5.8 Vcc=+5V Small signal Vicm=0.5V Load=150Ω 5.7 5.6 1M Vcc=+5V Vin=1Vp-p Vicm=0.5V Load=150Ω 5.5 100k 10M 1M Frequency (Hz) Figure 3. 10M Frequency (Hz) Total input noise vs. frequency Figure 4. 500 Distortion on 150Ω load -30 No load Input to GND Vcc=+5V 400 Vcc=+5V Vicm=0.5V F=1MHz Load=150Ω -40 Distortion (dB) en (nV/VHz) -50 300 200 -60 -70 HD2 -80 100 -90 0 100 1k 10k 100k 1M HD3 -100 0.0 10M 0.5 Figure 5. 1.0 1.5 2.0 2.5 3.0 Output Amplitude (Vp-p) Frequency (Hz) Cross-talk vs. frequency Figure 6. Output voltage swing vs. supply -30 5.0 Vcc=+5V Load=150Ω Vin=1Vp-p Vicm=+0.5V -40 Cross-talk (dB) -45 -50 -55 -60 -65 -70 -75 4.0 3.5 3.0 2.5 2.0 1.5 F=1MHz Vicm=+0.5V Load=150Ω 1.0 -80 0.5 -85 -90 100k 4.5 Output swing (Vp-p) -35 1M Frequency (Hz) 10M 0.0 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Vcc (V) 5/13 Electrical characteristics Figure 7. TSH173 Quiescent current vs. supply Figure 8. 30 80 25 60 Vcc=+5V Vin=+0.5V DC Vout is fixed by a generator 40 Iout (mA) 20 Icc (mA) Isink and Isource 15 20 0 10 -20 5 -40 0 0 1 2 3 4 5 6 1 2 Vcc (V) Figure 9. 3 4 Vout (V) Supply current vs. Tamb Figure 10. Output DC shift vs. Tamb 25 1.00 Vcc=+5V Load=150Ω 0.98 24 0.96 Output DCshift (V) 23 ICC (mA) 22 21 20 19 18 -20 0.92 0.90 0.88 0.86 0.84 Vcc=+5V no Load 17 -40 0.94 0.82 0 20 40 60 0.80 -40 80 -20 0 Ambient Temperature (°C) Figure 11. 20 40 60 80 60 80 Temperature (°C) Voltage gain vs. Tamb Figure 12. -1dB bandwidth vs. Tamb 6.6 9.0 8.5 6.4 Bw@-1dB (MHz) Gain (dB) 6.2 6.0 5.8 Vcc=+5V Load=150Ω 7.0 6.5 Vin=1Vp-p 6.0 5.5 -20 4.5 0 20 40 Ambient Temperature (°C) 6/13 7.5 5.0 5.6 5.4 -40 Vin=100mVp-p 8.0 60 80 4.0 -40 Vcc=5V Load=150Ω -20 0 20 40 Ambient Temperature (°C) TSH173 Electrical characteristics Figure 13. Higher output rail vs. Tamb Figure 14. Gain matching vs. Tamb 1.0 4.0 0.8 GM (%) VOH (V) 3.5 3.0 Vcc=+5V Load=150Ω Vin=+0.3V and +1V 0.6 0.4 2.5 0.2 Vcc=5V Load=150Ω 2.0 -40 -20 0 20 40 60 0.0 -40 80 -20 50 45 45 40 40 35 30 25 60 80 30 25 0 40 35 Vcc=+5V -20 20 Figure 16. Isource vs. Tamb 50 Isource (mA) Isink (mA) Figure 15. Isink vs. Tamb 20 -40 0 Ambient Temperature (°C) Ambient Temperature (°C) 20 40 60 80 Ambient Temperature (°C) 20 -40 Vcc=+5V Load=150Ω -20 0 20 40 60 80 Ambient Temperature (°C) Figure 17. Ibias vs. Tamb 5.0 4.5 4.0 IBIAS (µA) 3.5 3.0 2.5 2.0 1.5 1.0 -40 Vcc=+5V Load=150Ω -20 0 20 40 60 80 Ambient Temperature (°C) 7/13 Electrical characteristics 3.1 TSH173 Synchronization tip The TSH173, in single 0/5V supply, is designed to drive the video signal on the line without any damage to the synchronization tip. This is achieved by a small internal DC shift and a very low output rail. The DAC offset, as shown in Figure 18, can be as low as 0V. Nevertheless, in order to minimize the DC component on the line, the output can be AC coupled by a capacitor (Figure 20). Figure 18. Input signal 160ns 150ns Black (30 IRE) 64µs 300mV 4.6µs (0 IRE) DAC offset GND Synchronization tip Figure 19. DC coupled output configuration Video DAC 75Ω TSH173 75Ω Cable Vin 75Ω Vout 75Ω Vout Figure 20. AC coupled output configuration 220µF Video DAC TSH173 Vin 8/13 75Ω 75Ω Cable TSH173 3.2 Electrical characteristics 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 greater than 10µF is necessary to minimize the distortion. For better quality bypassing, we recommend to add a 10nF capacitor, also placed as close as possible to the IC pins. Bypass capacitors must be incorporated for both the negative and the positive supply. Figure 21. Circuit for power supply bypassing +VCC 10µF + 10nF 4 IN1 IN2 IN3 TSH173 OUT1 OUT2 OUT3 5 9/13 Using the TSH173 to drive video components 4 TSH173 Using the TSH173 to drive video components Figure 22. Video line interface implementation schematics 2.035V 1V Video DAC 1Vpp 0.635V 0.035V GND 450mV + LPF DAC load resistor Video DAC G 0.7Vpp DAC load resistor 1.0175V B 75Ω 75Ω Cable GND +6dB 0.3175V GND 75Ω 5th Order 2.035V Video DAC 1.4Vpp 0.635V 450mV LPF TV 0.7Vpp Reconstruction Filtering + 0.3V 0.0175V GND 75Ω 5th Order 0.3V GND 1V 75Ω 75Ω Cable +6dB 2.035V 1V 1Vpp 1V Reconstruction Filtering 0.3V GND R 2Vpp 1.4Vpp 0.7Vpp 0.7Vpp 0.3V GND 450mV + DAC load resistor 1.0175V Reconstruction Filtering 0.635V 75Ω 75Ω Cable GND LPF +6dB 0.3175V GND 75Ω 5th Order TSH173 The interface is illustrated in Figure 23. It is composed of: ● Three 75-ohm resistors ● Three matching resistors ● One 10µF power supply decoupling capacitor ● One 10nF power supply decoupling capacitor Figure 23. Bill of materials of the interface +5V DAC DAC DAC Y,G Pb,B,C Pr,R,CVBS Cable 75Ω Cable 75Ω Cable R R TSH173 SO8 R 10/13 75Ω TV TSH173 5 Package mechanical data Package mechanical data Figure 24. SO-8 package Dimensions Ref. Millimeters Min. Typ. Inches Max. Min. Typ. 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° (max.) 0.1 0.04 11/13 Ordering information 6 TSH173 Ordering information Table 4. Order codes Part number Temperature range TSH173ID Package Packaging Marking SO-8 Tube TSH173I SO-8 Tape & reel TSH173I -40°C to +85°C TSH173IDT 7 12/13 Revision history Date Revision 21-Mar-2007 1 Changes Initial release. TSH173 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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