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| TSH122 Ultra low power video buffer/filter with power-down Features SC70 Very low consumption: 1.7 mA Ultra low power-down mode: 4 nA typ., 500 nA max. Internal 6th order reconstruction filter Internal gain of 6 dB Rail-to-rail output buffer for 75 video line Excellent video performance - Differential gain 0.5% - Differential phase 0.10 - Group delay of 10 ns SAG correction Bottom of video signal close to 0 V Tested with 2.5 V and 3.3 V single supply Data min. and max. are physically tested and guaranteed during production (consumption, gain, filtering, and other parameters are guaranteed) SAG 3 4 OUT GND 2 5 EN (enable) Top view IN 1 6 Vcc Applications Description The TSH122 is a video buffer that uses a voltage feedback amplifier, with an internal gain of 6 dB, an output rail-to-rail, an internal input DC-shift and a SAG correction. A power-down function allows switching to a sleep mode with an ultra-low consumption. The TSH122 features a 6th-order internal reconstruction filter to attenuate the parasitic frequency of 27 MHz from the clock of the video DAC. The TSH122 operates from 2.25 to 5 V single power supplies and is tested at 2.5 V and 3.3 V. The TSH122 is a single operator available in a tiny SC70 plastic package for space saving. Mobile phones Digital still camera Digital video camera Portable DVD players August 2008 Rev 1 1/16 www.st.com 16 Absolute maximum ratings and operating conditions TSH122 1 Absolute maximum ratings and operating conditions Table 1. Symbol VCC Vin Absolute maximum ratings Parameter Supply voltage(1) Maximum input amplitude Storage temperature Maximum junction temperature SC70 thermal resistance junction to ambient area SC70 thermal resistance junction to case Maximum power dissipation for Tj=150C Tamb = +25C Tamb = +85C CDM: charged device model(2) HBM: human body model(3) MM: machine model(4) Output short-circuit Value 5.5 0 to Vcc -65 to +150 150 205 172 609 317 1.5 1.5 300 (5) Unit V V C C C/W C/W mW kV kV V Tstg Tj Rthja Rthjc Pmax ESD 1. All voltage values, except differential voltage, are with respect to network terminal. 2. Charged device model: all pins and the package are charged together to the specified voltage and then discharged directly to the ground through only one pin. This is done for all pins. 3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 k resistor between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating. 4. Machine model: a 200 pF 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 5. 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. Table 2. Symbol VCC Operating conditions Parameter Power supply voltage Operating free air temperature range Value 2.25 to 5 (1) -40 to +85 Unit V C Toper 1. Tested in full production at 0 V/2.5 V and 0 V/3.3 V single power supply. 2/16 TSH122 Electrical characteristics 2 Table 3. Symbol Electrical characteristics VCC = +2.5V, +3.3V, Tamb = 25C (unless otherwise specified) Parameter Test conditions Min. Typ. Max. Unit DC performance Vdc Iib Output DC level shift RL = 150 VCC = +3.3V Input bias current VCC = +3.3V, Tmin Tamb Tmax Vin=0V to 1V DC, VCC=+2.5V G Internal voltage gain Vin=0V to 1.4V DC, VCC=+3.3V VCC=3.3V Tmin Tamb Tmax PSRR Power supply rejection ratio 20 log (VCC/Vout) VCC=100mV at 1kHz Vin=+0.5V DC Vin=0V, no load VCC=+3.3V VCC=+2.5V VCC=+3.3V Tmin Tamb Tmax Dynamic performance and output characteristics Small signal VCC=+3.3V, RL = 150 -3dB bandwidth -1dB bandwidth -1dB bandwidth VCC = +3.3V, Tmin Tamb Tmax Small signal VCC=+3.3V, RL=150 VCC = +3.3V, Tmin Tamb Tmax G Gd VOH Differential gain Differential phase Group delay High level output voltage VCC=+3.3V, RL=150 VCC=+3.3V, RL=150 VCC=+3.3V, 10kHz-5MHz VCC=+3.3V, RL=150 VCC=+2.5V, RL=150 3.1 2.3 36 5.8 5.8 70 -1.5 115 -0.87 -0.93 6 6 5.96 55 dB 6.1 6.1 dB A 168 mV ICC Positive supply current DC consumption 2 1.7 2.4 2.4 2.1 mA mA BW Filter bandwidth 5.4 9.5 7.2 6.75 MHz 47 46 0.5 0.1 6 3.2 2.4 dB dB % ns V FR 27 MHz rejection 3/16 Electrical characteristics Table 3. Symbol VOL Iout TSH122 VCC = +2.5V, +3.3V, Tamb = 25C (unless otherwise specified) (continued) Parameter Low level output voltage Output short circuit current Test conditions RL = 150 VCC=+2.5V Min. Typ. 11 75 Max. 40 Unit mV mA Noise and distortion eN Total output noise F = 100kHz, no load VCC=+3.3V, RL = 150 Vin=1Vp-p, F=1MHz H2 H3 51 nV/Hz HD Harmonic distortion 64 61 dBc Enable/power-down Low level on pin-5: TSH122 in power-down High level on pin-5: TSH122 enabled Isd Vlow Vhigh Ton Toff Consumption in power-down mode Low-level threshold High-level threshold Time from power-down to enable Time from enable to power-down VCC=+3.3V 0 +0.7 1 1 4 500 +0.3 VCC nA V V s s 4/16 TSH122 Electrical characteristics Figure 1. 10 0 -10 -20 Frequency response Figure 2. 6.2 6.1 6.0 5.9 Gain flatness Vcc=+2.5V Vcc=+3.3V Flatness (dB) Gain (dB) 5.8 5.7 5.6 5.5 -30 -40 -50 -60 -70 -80 1M Vcc=+5V Vcc=3.3V Load=150 Small signal Vicm=0.5V 10M 100M 5.4 5.3 5.2 1M 10M Frequency (Hz) Frequency (Hz) Figure 3. 250 Input noise No load Input to GND Vcc=+2.5V and +3.3V Figure 4. 5 Distortion Vcc=+5V Load=150 4 200 en (nV/VHz) Vout (V) 150 3 Vcc=+3.3V Vcc=+2.5V 100 2 50 1 0 100 1k 10k 100k 1M 0 0.0 0.5 1.0 1.5 2.0 2.5 Frequency (Hz) Vin (V) Figure 5. -30 Distortion at Vcc=2.5 V Figure 6. -30 Distortion at Vcc=3.3 V -40 Vcc=2.5V Load=150 -40 Vcc=3.3V Load=150 -50 -50 Distortion (dB) -60 Distortion (dB) -60 -70 H2 -70 H2 H3 -80 H3 -80 -90 -90 -100 0.0 0.5 1.0 1.5 2.0 2.5 -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Output Amplitude (Vp-p) Output Amplitude (Vp-p) 5/16 Electrical characteristics TSH122 Figure 7. 125 124 123 DCshift vs. Vcc Figure 8. 10 9 8 7 VOL vs. Vcc Output DCshift (mV) 122 121 120 119 118 117 116 115 2.0 VOL (mV) 6 5 4 3 2 Load=150 2.5 3.0 3.5 4.0 4.5 5.0 1 0 2 Vin= -100mV Load=150 3 4 5 Vcc (V) Vcc (V) Figure 9. 4.0 3.5 Icc vs. Vcc Figure 10. Power down 2.00 1.75 3.0 1.50 2.5 Icc (mA) Isd (nA) 0 1 2 3 4 5 6 2.0 1.5 1.25 1.00 1.0 0.75 0.5 0.0 0.50 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Vcc (V) Vcc (V) Figure 11. Switch-on output settling Figure 12. Switch-off output settling EN (pin5) EN (pin5) Vout (pin4) Vout (pin4) Vcc=+3.3V, Vin=+1.3Vdc Vcc=+3.3V, Vin=+1.3Vdc 6/16 TSH122 Electrical characteristics Figure 13. In/Out switch on/off Figure 14. Synchronization tip at 0 V Vin Vin Vout Vout EN (pin5) Vcc=+3.3V Vcc=+3.3V Figure 15. VOL vs. temperature 20.0 17.5 15.0 Figure 16. VOH vs. temperature 5.0 Load=150 4.5 4.0 VOH (mV) VOL (mV) 12.5 10.0 7.5 5.0 2.5 Vcc=+2.5V 3.5 Vcc=+3.3V 3.0 Vcc=+3.3V 2.5 Load=150 0.0 -40 -20 0 20 40 60 80 Vcc=+2.5V 2.0 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) Figure 17. Bandwidth vs. temperature 9.0 8.5 Figure 18. Attenuation vs. temperature -40.0 -42.5 Attenuation@27MHz (dB) 8.0 Vcc=+2.5V Vcc=+2.5V -45.0 -47.5 -50.0 -52.5 -55.0 -57.5 Bw@-1dB (MHz) 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 -40 Vcc=+3.3V Vcc=+3.3V Small signal Load=150 -20 0 20 40 60 80 Load=150 -60.0 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) 7/16 Electrical characteristics TSH122 Figure 19. Icc vs. temperature 3.0 Figure 20. Gain vs. temperature 6.10 2.5 Vcc=+3.3V 2.0 6.05 Gain (dB) ICC (mA) Vcc=+3.3V 6.00 1.5 Vcc=+2.5V 1.0 5.95 0.5 Vcc=+2.5V no Load 0.0 -40 -20 0 20 40 60 80 5.90 -40 Load=150 -20 0 20 40 60 80 Temperature (C) Temperature (C) Figure 21. Output DC shift vs. temperature 200 180 160 Figure 22. Ibias vs. temperature 0.00 Vcc=+2.5V and +3.3V Load=150 -0.25 -0.50 Output DCshift (mV) 140 IBIAS (A) 120 100 80 60 -0.75 -1.00 -1.25 -1.50 Vcc=+2.5V Vcc=+3.3V 40 20 0 -40 -1.75 Load=150 -20 0 20 40 60 80 -2.00 -40 -20 0 20 40 60 80 Temperature (C) Temperature (C) 8/16 TSH122 Application information 3 3.1 Application information Power supply considerations Correct power supply bypassing is very important for optimizing performance in high-frequency ranges. The bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor greater than 10 F is necessary to minimize the distortion. For better quality bypassing, we recommend adding a 10 nF capacitor, also placed as close as possible to the IC pins. Figure 23. Circuit for power supply bypassing Figure 24. Supply noise rejection 10 0 Noise supply rejection (dB) Vcc=5V(dc)+0.2Vp-p(ac) Load=150 Bypass capacitors: 10F+10nF -10 -20 -30 -40 -50 -60 -70 -80 10k 100k 1M 10M 100M Frequency (Hz) 9/16 Application information TSH122 3.2 3.2.1 Implementation considerations Input The DC level shifter optimizes the position of the video signal with no clamping on the output rails. 3.2.2 Filter A reconstruction filter is used to attenuate the DAC's sampling frequency because it generates a parasitic signal in the video spectrum (typically at 27 MHz in the case of standard video). This function is fulfilled while keeping a low group delay and a good gain flatness along the video band. Figure 25. Internal schematic 2.25 V to 5 V +Vcc DC shifter Input 1 LPF 6th order + 6 5 Power-down + 4 Output R 2R 2R 2R 3 SAG 2 GND 3.2.3 Output In an AC-coupling configuration, the SAG correction allows use of two small low-cost capacitors in place of one large capacitor (see Figure 26). The AC-coupling output reduces the power consumption by removing the DC component included in the signal. Nevertheless, the output can be directly connected to the line without any capacitor. In this case, the OUT and SAG pins are connected together and the equivalent gain of the buffer remains at 6 dB (see Figure 27). 10/16 TSH122 Figure 26. Schematic diagram with output capacitor Application information Figure 27. Schematic diagram without output capacitor 11/16 Application information TSH122 3.3 Using the TSH122 to drive a Cvbs signal Figure 28. Details on Cvbs (NTSC color bar 100%) DAC output amplitude +133 IRE ~1.3 V +100 IRE White 0 IRE Blanking level Burst Synchronization tip -40 IRE GND With its internal DC shift, the TSH122 can drive a video signal from the DAC output as low as 0 V (bottom of the synchronization tip at 0 V - see Figure 14). 12/16 TSH122 Package information 4 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 29. SC70-6 (or SOT323-6) package footprint (in millimeters) 0.65 1.05 0.80 2.90 0.40 13/16 Package information Figure 30. 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 25.6 Mils Typ TSH122 Max 43.3 3.9 39.3 11.8 7.0 86.6 43.1 94.5 15.7 15.7 A2 D A1 b L HE Q1 C e e 14/16 E A TSH122 Ordering information 5 Ordering information Table 4. Order codes Temperature range -40C to +85C Package SC70 Packaging Tape & reel Marking K31 Part number TSH122ICT 6 Revision history Table 5. Date 04-Aug-2008 Document revision history Revision 1 Initial release. Changes 15/16 TSH122 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. 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