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| TSH120 2.2V to 5V video buffer with SAG correction Features Very low consumption Standby mode available Internal reconstruction filter Internal gain of 6dB Rail-to-rail output Tested with +2.5V and +3.3V single supply Operation supply from +2.2V to +5.5V SAG correction Excellent video performance - Differential gain 0.5% - Differential phase 0.5 - Group delay=10ns Specified for 150 load Input DC level shifter Min. and max. limits are tested in full production Pin connections (top view) 20 H1 TS IN 1 GND 2 SAG 3 6 VCC 5 EN (Enable) 4 OUT Applications The TSH120 is a single operator available in a tiny SC70 plastic package for space saving. Camera phones Digital still camera Digital video camera Set-top box and DVD video outputs Description The TSH120 is a video buffer that includes a voltage feedback amplifier with an internal gain of 6dB, rail-to-rail output, internal input biasing and SAG correction. A power down function offers a sleep mode with ultra low consumption. The TSH120 also features an internal reconstruction filter in order to attenuate the parasitic 27MHz frequency from the clock of the video DAC. August 2007 Rev 3 1/13 www.st.com 13 Absolute maximum ratings TSH120 1 Absolute maximum ratings Table 1. Symbol VCC Vin Toper Tstg Tj Rthja Rthjc Pmax Supply voltage (1) Input voltage range (2) Absolute maximum ratings Parameter Value 6 2 -40 to +105 -65 to +150 150 430 58 290 150 2 1.5 200 200 Unit V V C C C C/W C/W mW Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to ambient Thermal resistance junction to case Maximum power dissipation(3) for Tj=150C Ta=+25C Ta=+85C HBM: human body model (4) except pin-4 pin-4 MM: machine model (5) Latch-up immunity kV V mA ESD 1. All voltage values are measured with respect to the ground pin. 2. The magnitude of input and output voltage must never exceed VCC +0.3V. 3. Short-circuits can cause excessive heating. Destructive dissipation can result from short-circuits on amplifiers. 4. Human body model: A 100pF capacitor is charged to the specified voltage, then discharged through a 1.5k resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 5. Machine model: A 200pF capacitor is charged to the specified voltage, then discharged directly between two pins of the device with no external series resistor (internal resistor < 5). This is done for all couples of connected pin combinations while the other pins are floating. This is a minimum value. Table 2. Symbol VCC Operating conditions Parameter Supply voltage (1) Value 2.2 to 5.5 Unit V 1. Tested in full production at +2.5V and +3.3V single supply voltage. 2/13 TSH120 Electrical characteristics 2 Table 3. Symbol Electrical characteristics Electrical characteristics for VCC = +2.5V and +3.3V, Tamb = 25C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit DC performance Vdc Output DC level shift RL = 150 Tmin Tamb Tmax VCC= +3.3V Tmin Tamb Tmax VCC= +2.5V Tmin Tamb Tmax Internal voltage gain Power supply rejection ratio 20 log (VCC/Vout) Vin=1V Tmin Tamb Tmax VCC=100mV at 1MHz No load, Vin=+0.5V VCC=+3.3V Tmin Tamb Tmax No load, Vin=+0.5V VCC=+2.5V Tmin Tamb Tmax -880 -840 5.95 94 129 403 -550 -650 nA -550 -620 6.1 6.05 55 6.2 dB dB 158 mV V/C Iib Input bias current G PSRR 5.8 6.7 5.8 6.7 6.6 mA ICC Current consumption 6.3 mA Enable/standby (EN pin) ISTBY VSTBY-low VSTBY-high Ton Toff Consumption in standby mode Standby low level Standby high level Time from standby to enable Time from enable to standby VCC=+3.3V VCC=+2.5V Standby mode Enable mode +0.8 5 5 4 2 +0.3 A V V s s Dynamic performance and output characteristics Vout=2Vpp, RL = 150 VCC=+3.3V, F=4.5MHz Tmin Tamb Tmax FR Frequency response Vout=2Vpp, RL = 150 VCC=+2.5V, F=4.5MHz VCC=+3.3V, F=27MHz Tmin Tamb Tmax VOH High level output voltage VCC=+3.3V, RL=150 VCC=+2.5V, RL=150 -20 3.13 2.36 -0.4 -0.1 -0.48 0 -25 -23 3.21 2.42 0.4 dB V 3/13 Electrical characteristics Table 3. Symbol TSH120 Electrical characteristics for VCC = +2.5V and +3.3V, Tamb = 25C (unless otherwise specified) (continued) Parameter Test conditions Vin= -100mV, RL = 150 VCC=+3.3V Tmin Tamb Tmax Vin= -100mV, RL = 150 VCC=+2.5V Tmin Tamb Tmax Isource Differential gain Differential phase Group delay VCC=+3.3V, output to GND VCC=+3.3V, RL = 150 VCC=+3.3V, RL = 150 10kHz to 6MHz Min. Typ. Max. Unit 5 5.6 5 5.5 30 0.5 0.5 34 mV 33 VOL Low level output voltage Iout G Gd Noise eN SNR mA % 10 (1) ns Total output noise Output signal to noise ratio F = 100kHz, no load VCC=+3.3V, RL = 150 Vout=2Vpp from 0 to 6MHz 25 60 nV/Hz dB 1. Guaranteed by design. The parameter is not tested. 4/13 TSH120 Electrical characteristics Figure 1. 10 5 0 -5 -10 -15 Frequency response Figure 2. 7.0 6.8 Gain flatness Vcc=+3.3V Load=150 Vcc=+5V Vcc=+3.3V Vcc=+2.5V 6.6 6.4 Gain (dB) -20 -25 -30 -35 -40 -45 -50 -55 -60 100k 1M Gain (dB) 100M 6.2 6.0 5.8 5.6 5.4 5.2 5.0 100k 10M 27MHz 1M 10M Frequency (Hz) Frequency (Hz) Figure 3. 500 Total input noise vs. frequency No load Input to GND Vcc=+3.3V Figure 4. -20 Distortion on 150 load 400 -30 Vcc=+3.3V Vicm=0.5V F=1MHz Load=150 en (nV/VHz) 300 Distortion (dB) -40 H2 -50 200 100 -60 H3 0 10 100 1k 10k 100k 1M 10M -70 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Frequency (Hz) Output Amplitude (Vp-p) Figure 5. 5.0 Output voltage swing vs. supply 4.5 F=1MHz Load=150 Output swing (Vp-p) 4.0 3.5 3.0 2.5 2.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Vcc (V) 5/13 Electrical characteristics TSH120 Figure 6. 7.0 Quiescent current vs. supply Figure 7. 150 Output DC shift vs. VCC 6.5 145 6.0 Output DC shift (mV) 140 Icc (mA) 5.5 135 5.0 130 4.5 no input signal Load=150 2.5 3.0 3.5 4.0 4.5 5.0 5.5 125 Vin=+0.5Vdc Load=150 4.0 2.0 120 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Vcc (V) Vcc (V) Figure 8. Standby - Output Ton (VCC=+3.3V) Figure 9. Standby - Output Toff (VCC=+3.3V) Out Out Pin-5 Pin-5 Figure 10. Flatness vs. Tamb 0.5 0.4 0.3 Figure 11. Ibias vs. Tamb 0.0 Vout=2Vp-p Load=150 -0.1 Vcc=+2.5V and +3.3V Load=150 Flatness@4.5MHz (dB) 0.2 -0.2 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 -40 IBIAS (A) Vcc=+3.3V 20 40 60 80 0.1 Vcc=+2.5V -0.3 -0.4 -0.5 -0.6 -20 0 -0.7 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) 6/13 TSH120 Electrical characteristics Figure 12. Voltage gain vs. Tamb 6.10 Figure 13. Filter attenuation vs. Tamb -20 -22 Load=150 6.05 Attenuation@27MHz (dB) -24 -26 -28 -30 -32 -34 -36 -38 -40 -40 6.00 Gain (dB) Vcc=+3.3V 5.95 5.90 5.85 Vcc=+2.5V Vcc=+2.5V and +3.3V Load=150 -20 0 20 40 60 80 5.80 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) Figure 14. Supply current vs. Tamb 7.0 6.5 6.0 Figure 15. Output DC shift vs. Tamb 180 170 160 Vcc=+2.5V and +3.3V Load=150 Output DCshift (V) Vcc=+2.5V and +3.3V no input signal no Load -20 0 20 40 60 80 150 140 130 120 110 100 90 80 -40 5.5 ICC (mA) 5.0 4.5 4.0 3.5 3.0 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) Figure 16. VOH vs. Tamb 4.0 Figure 17. VOL vs. Tamb 10 Load=150 9 8 3.5 Vcc=+3.3V 7 VOL (mV) VOH (V) 6 5 4 3 Vcc=+2.5V Vcc=+3.3V 3.0 2.5 2 Vcc=+2.5V 1 0 -40 Load=150 -20 0 20 40 60 80 2.0 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) 7/13 Implementation in the application TSH120 3 Implementation in the application This section explains how the TSH120 video buffer operates in a typical application. On the input, a DC level shifter optimizes the position of the video signal with no clamping on the output rails. The filter is a reconstruction filter. It is used to attenuate the DAC's sampling frequency which causes a parasitic signal in the video spectrum (typically at 27MHz in the case of standard video). This function must be achieved while keeping a low group delay. On the output, the SAG correction decreases Cout while keeping a very low frequency pole (see Figure 18). Nevertheless, the output can be directly connected to the line without any capacitor. In this case, both OUT and SAG pins are connected together and the equivalent gain of the buffer remains 6dB (see Figure 19). Figure 18. Schematic diagram with output capacitor +2.2V to +5.5V DC shifter 6 TV 5 Shutdown Rail-to-rail Video DAC 1Vpp 1 LPF 3rd order + - Cout 33F 4 3 SAG 22F 75 75 cable 1Vpp 75 2Vpp 2 Figure 19. Schematic diagram without output capacitor +2.2V to +5.5V DC shifter 6 TV 5 Shutdown Rail-to-rail Video DAC 1Vpp 1 LPF 3rd order + - 75 4 3 SAG 75 cable 1Vpp 75 2Vpp 2 8/13 TSH120 Power supply considerations 4 Power supply considerations Correct power supply bypassing is very important for optimizing performance in the highfrequency range. A bypass capacitor greater than 10F is necessary to minimize the distortion. For better quality bypassing at higher frequencies, a capacitor of 10nF must be added as close as possible to the IC pin of VCC. Figure 20. Circuit for power supply bypassing +VCC + CHF=10nF CLF=10 F TSH120 Figure 21 shows the noise supply rejection improvement with bypass capacitors expressed by: 20 log (Vout / VCC). Figure 21. Noise supply rejection 0 -10 Noise supply rejection (dB) -20 -30 -40 -50 -60 -70 -80 -90 -100 10k Vcc=+3.3Vdc+0.2Vac Load=150 CLF=10uF CHF=100nF 100k 1M 10M 100M Frequency (Hz) 9/13 Package information TSH120 5 Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) 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. Figure 22. SC70-6 (or SOT323-6) package footprint (in millimeters) 0.65 1.05 0.80 2.90 0.40 10/13 TSH120 Figure 23. SC70-6 (or SOT323-6) package mechanical data Dimensions Ref Min A A1 A2 b c D E e HE L Q1 1.8 0.10 0.10 0.80 0 0.80 0.15 0.10 1.80 1.15 0.65 2.4 0.40 0.40 70.8 3.9 3.9 Millimeters Typ Max 1.10 0.10 1.00 0.30 0.18 2.20 1.35 Min 31.5 0 31.5 5.9 3.9 70.8 45.2 Package information Mils Typ Max 43.3 3.9 39.3 11.8 7.0 86.6 43.1 25.6 94.5 15.7 15.7 A2 D A1 b L HE Q1 C e e E A 11/13 Ordering information TSH120 6 Ordering information Table 4. Order codes Temperature range -40C to +85C Package SC70-6 (or SOT323-6) Packaging Tape & reel Marking K30 Part number TSH120ICT 7 Revision history Table 5. Date 29-May-2007 20-Jun-2007 21-Aug-2007 Document revision history Revision 1 2 3 Changes Initial version, preliminary data. First complete datasheet. Corrected pinout diagram on cover page (SAG missing). 12/13 TSH120 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 13/13 |
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