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TSH345IDT-TSH345IPT
Single supply triple video buffer and selectable filter for HD and SD video applications
December 2008 Rev 1 1/23
TSH345 riple video buffer with selectable filter
for HD and SD video applications
Features Selectable 6th order filtering of 36 MHz, MHz and 9 MHz5 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
Applications High-end video systems High definition TV (HDTV) Broadcast and graphic video Multimedia products
DescriptionThe 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 75Ω
video lines. The TSH345 is ideal to drive YC,
CVBS, YUV, YPbPr or RGB signals from video
DAC outputs.
The main advantage of this circuit is its input DC
level shifter. It allows driving video signals on 75Ω
video lines without damaging the synchronization
tip and without input or output capacitors when
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 SO-14 and TSSOP-14
plastic packages for optimum space saving.
Absolute maximum ratings and operating conditions TSH3452/23
Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings All voltage values, except differential voltage, are with respect to network terminal.
Table 2. Operating conditions Tested in full production with +5 V single power supply.
TSH345 Electrical characteristics 3/23
2 Electrical characteristics Table 3. Electrical characteristics at VCC=+5 V single supply, Tamb =25°C
(unless otherwise specified)
Electrical characteristics TSH3454/23
Table 3. Electrical characteristics at VCC=+5 V single supply, Tamb =25°C
(unless otherwise specified) (continued)
TSH345 Electrical characteristics 5/23
Table 4. Filter and standby settings, VCC=+5 V single supply, Tamb =25°C Fs1 and Fs0 pins must never be left floating.
Table 5. Mux settings, VCC=+5 V single supply, Tamb =25°C The MUX pin must never be left floating.
Electrical characteristics TSH3456/23
Figure 1. Filtering Figure 2. Gain flatness
Figure 3. Distortion 1 MHz (HD) Figure 4. Distortion 10 MHz (HD)
Figure 5. Distortion 1 MHz (PV) Figure 6. Distortion 10 MHz (PV)
TSH345 Electrical characteristics 7/23
Figure 7. Distortion 1 MHz (SD filter) Figure 8. Input noise vs. frequency
Figure 9. Gain vs. input amplitude Figure 10. Channel crosstalk vs. frequency
Figure 11. Output vs input amplitude Figure 12. MUX isolation
Electrical characteristics TSH3458/23
Figure 13. Current consumption vs. supply Figure 14. Supply current vs. temperature
Figure 15. Filtering vs. temperature Figure 16. Filter attenuation vs. temperature
Figure 17. Gain matching vs. temperature Figure 18. Output DC shift vs. temperature
TSH345 Electrical characteristics 9/23
Figure 19. Standby current vs. temperature Figure 20. Isink vs. temperature
Figure 21. Isource vs. temperature Figure 22. Ibias vs. temperature
Figure 23. VOL vs. temperature Figure 24. VOH vs. temperature
Electrical characteristics TSH34510/23
Figure 25. Gain vs. temperature
TSH345 Electrical characteristics 11/23
2.1 Power supply considerations: improving the power supply
noise rejectionCorrect power supply bypassing is very important to optimize 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 10 µF is
necessary to improve the PSRR in low frequencies. For better quality bypassing, you can
add a capacitor of 100 nF (CHF). CHF must be placed as close as possible to the IC pin to
improve the noise supply rejection in the higher frequencies. A coil can be added in order to
better reject the noise from the supply and to prevent current peaks as much as possible.
Figure 26. Circuit for power supply bypassing
Electrical characteristics12/23
