TSH122ICT

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 Ω 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) Applications ■ Mobile phones ■ Digital still camera ■ Digital video camera ■ Portable DVD players Top view IN 1 6 Vcc GND 2 5 EN (enable) SAG 3 4 OUT 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. August 2008 Rev 1 1/16 www.st.com 16 Absolute maximum ratings and operating conditions 1 TSH122 Absolute maximum ratings and operating conditions Table 1. Absolute maximum ratings Symbol Value Unit 5.5 V 0 to Vcc V -65 to +150 °C Maximum junction temperature 150 °C Rthja SC70 thermal resistance junction to ambient area 205 °C/W Rthjc SC70 thermal resistance junction to case 172 °C/W Pmax Maximum power dissipation for Tj=150°C Tamb = +25°C Tamb = +85°C 609 317 mW ESD CDM: charged device model(2) HBM: human body model(3) MM: machine model(4) 1.5 1.5 300 kV kV V VCC Vin Tstg Tj Parameter Supply voltage(1) Maximum input amplitude Storage temperature (5) Output short-circuit 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 kΩ 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 Ω). 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. Operating conditions Symbol Parameter Unit VCC Power supply voltage 2.25 to 5 (1) V Toper Operating free air temperature range -40 to +85 °C 1. Tested in full production at 0 V/2.5 V and 0 V/3.3 V single power supply. 2/16 Value TSH122 Electrical characteristics 2 Electrical characteristics Table 3. VCC = +2.5V, +3.3V, Tamb = 25°C (unless otherwise specified) Symbol Parameter Test conditions Min. Typ. Max. Unit RL = 150Ω 70 115 168 mV VCC = +3.3V -1.5 -0.87 DC performance Vdc Iib G Output DC level shift Input bias current Internal voltage gain VCC = +3.3V, Tmin ≤ Tamb ≤ Tmax Vin=0V to 1V DC, VCC=+2.5V 5.8 6 6.1 Vin=0V to 1.4V DC, VCC=+3.3V 5.8 6 6.1 VCC=3.3V Tmin ≤ Tamb ≤ Tmax PSRR ICC Power supply rejection ratio 20 log (ΔVCC/ΔVout) Positive supply current DC consumption μA -0.93 dB 5.96 ΔVCC=±100mV at 1kHz Vin=+0.5V DC 55 Vin=0V, no load VCC=+3.3V VCC=+2.5V 2 1.7 VCC=+3.3V Tmin ≤ Tamb ≤ Tmax dB 2.4 2.1 mA 2.4 mA 9.5 7.2 MHz Dynamic performance and output characteristics BW Filter bandwidth Small signal VCC=+3.3V, RL = 150Ω -3dB bandwidth -1dB bandwidth 5.4 -1dB bandwidth VCC = +3.3V, Tmin ≤ Tamb ≤ Tmax FR 27 MHz rejection Small signal VCC=+3.3V, RL=150Ω 6.75 36 47 dB VCC = +3.3V, Tmin ≤ Tamb ≤ Tmax 46 dB ΔG Differential gain VCC=+3.3V, RL=150Ω 0.5 % ΔΦ Differential phase VCC=+3.3V, RL=150Ω 0.1 ° Gd Group delay VCC=+3.3V, 10kHz-5MHz 6 ns VOH High level output voltage VCC=+3.3V, RL=150Ω VCC=+2.5V, RL=150Ω 3.2 2.4 V 3.1 2.3 3/16 Electrical characteristics Table 3. TSH122 VCC = +2.5V, +3.3V, Tamb = 25°C (unless otherwise specified) (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit 40 mV VOL Low level output voltage RL = 150Ω 11 Iout Output short circuit current VCC=+2.5V 75 mA Total output noise F = 100kHz, no load 51 nV/√Hz Harmonic distortion VCC=+3.3V, RL = 150Ω Vin=1Vp-p, F=1MHz H2 H3 64 61 VCC=+3.3V 4 Noise and distortion eN HD dBc Enable/power-down Low level on pin-5: TSH122 in power-down High level on pin-5: TSH122 enabled Isd Consumption in power-down mode 500 nA Vlow Low-level threshold 0 +0.3 V Vhigh High-level threshold +0.7 VCC V Ton Time from power-down to enable 1 μs Toff Time from enable to power-down 1 μs 4/16 TSH122 Electrical characteristics Figure 1. Frequency response Figure 2. 10 6.2 0 6.1 Flatness (dB) Gain (dB) Vcc=+3.3V 5.9 -20 -30 -40 -50 -70 Vcc=+2.5V 6.0 -10 -60 Gain flatness 5.8 5.7 5.6 Vcc=+5V 5.5 Vcc=3.3V Load=150Ω Small signal Vicm=0.5V 5.4 5.3 -80 1M 10M 5.2 1M 100M 10M Frequency (Hz) Figure 3. Frequency (Hz) Input noise Figure 4. 250 Vcc=+5V Load=150Ω No load Input to GND Vcc=+2.5V and +3.3V 200 4 150 Vout (V) en (nV/VHz) Distortion 5 100 50 Vcc=+3.3V 3 Vcc=+2.5V 2 1 0 100 1k 10k 100k 0 0.0 1M 0.5 1.0 Frequency (Hz) Figure 5. Distortion at Vcc=2.5 V Figure 6. -30 -40 -40 Distortion (dB) Distortion (dB) H2 Distortion at Vcc=3.3 V Vcc=3.3V Load=150Ω -60 -70 H2 -80 H3 -90 -100 0.0 2.5 -50 -60 -80 2.0 -30 Vcc=2.5V Load=150Ω -50 -70 1.5 Vin (V) H3 -90 0.5 1.0 1.5 Output Amplitude (Vp-p) 2.0 2.5 -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Output Amplitude (Vp-p) 5/16 Electrical characteristics DCshift vs. Vcc Figure 8. 125 10 124 9 123 8 122 7 VOL (mV) Output DCshift (mV) Figure 7. TSH122 121 120 119 6 5 4 118 3 117 2 Load=150Ω 116 115 2.0 VOL vs. Vcc Vin= -100mV Load=150Ω 1 0 2.5 3.0 3.5 4.0 4.5 5.0 2 3 Vcc (V) Figure 9. 4 5 Vcc (V) Icc vs. Vcc Figure 10. Power down 2.00 4.0 3.5 1.75 3.0 Isd (nA) Icc (mA) 1.50 2.5 2.0 1.25 1.5 1.00 1.0 0.75 0.5 0.0 0 1 2 3 4 5 6 0.50 2.0 2.5 Vcc (V) Figure 11. Switch-on output settling 3.0 3.5 EN (pin5) Vout (pin4) Vout (pin4) 6/16 4.5 Figure 12. Switch-off output settling EN (pin5) Vcc=+3.3V, Vin=+1.3Vdc 4.0 Vcc (V) Vcc=+3.3V, Vin=+1.3Vdc 5.0 5.5 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 Figure 16. VOH vs. temperature 5.0 20.0 Load=150Ω 17.5 4.5 15.0 VOH (mV) VOL (mV) 4.0 Vcc=+2.5V 12.5 10.0 Vcc=+3.3V 7.5 3.5 3.0 Vcc=+3.3V 5.0 2.5 2.5 Load=150Ω 0.0 -40 -20 Vcc=+2.5V 0 20 40 60 2.0 -40 80 -20 Temperature (°C) 60 80 -40.0 8.5 -42.5 Attenuation@27MHz (dB) Vcc=+2.5V 8.0 Bw@-1dB (MHz) 40 Figure 18. Attenuation vs. temperature 9.0 7.5 7.0 Vcc=+3.3V 6.5 6.0 5.5 5.0 4.0 -40 20 Temperature (°C) Figure 17. Bandwidth vs. temperature 4.5 0 -47.5 Vcc=+3.3V -50.0 -52.5 -55.0 -57.5 Small signal Load=150Ω -20 Vcc=+2.5V -45.0 Load=150Ω 0 20 40 Temperature (°C) 60 80 -60.0 -40 -20 0 20 40 60 80 Temperature (°C) 7/16 Electrical characteristics TSH122 Figure 19. Icc vs. temperature Figure 20. Gain vs. temperature 3.0 6.10 2.5 Vcc=+3.3V 6.05 Gain (dB) ICC (mA) 2.0 Vcc=+2.5V 1.5 Vcc=+3.3V 6.00 1.0 Vcc=+2.5V 5.95 0.5 no Load 0.0 -40 -20 Load=150Ω 0 20 40 60 5.90 -40 80 -20 Temperature (°C) 20 40 60 80 60 80 Temperature (°C) Figure 21. Output DC shift vs. temperature Figure 22. Ibias vs. temperature 0.00 200 180 0 Vcc=+2.5V and +3.3V Load=150Ω -0.25 -0.50 140 Vcc=+2.5V -0.75 120 IBIAS (μA) Output DCshift (mV) 160 100 80 -1.00 Vcc=+3.3V -1.25 60 -1.50 40 -1.75 20 0 -40 Load=150Ω -20 0 20 40 Temperature (°C) 8/16 60 80 -2.00 -40 -20 0 20 40 Temperature (°C) TSH122 Application information 3 Application information 3.1 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 µF 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 6## M&  N&  43(  Figure 24. Supply noise rejection 10 Noise supply rejection (dB) 0 Vcc=5V(dc)+0.2Vp-p(ac) Load=150Ω Bypass capacitors: 10µF+10nF -10 -20 -30 -40 -50 -60 -70 -80 10k 100k 1M 10M 100M Frequency (Hz) 9/16 Application information TSH122 3.2 Implementation considerations 3.2.1 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 6 DC shifter Input 1 LPF 6th 5 Power-down + + 4 order - 2R 2R R 2R 2 3.2.3 Output 3 SAG GND 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 Application information Figure 26. Schematic diagram with output capacitor 6TO6 46   0OWER DOWN 6IDEO $!# —& 7 7 CABLE   $!#S LOAD 7  3!' —&  %QUIVALENTTOASINGLE !# COUPLINGOUTPUTWITH ABIGCAPACITOROF—& —& 7 7 CABLE  7 Figure 27. Schematic diagram without output capacitor 6TO6 46   0OWER DOWN 7 6IDEO $!# 7 CABLE   $!#S LOAD  7 3!'  11/16 Application information 3.3 TSH122 Using the TSH122 to drive a Cvbs signal Figure 28. Details on Cvbs (NTSC color bar 100%) DAC output amplitude +133 IRE +100 IRE 0 IRE ~1.3 V White 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 4 Package information Package information In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK® 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 TSH122 Figure 30. SC70-6 (or SOT323-6) package mechanical data Dimensions Ref Millimeters Min Typ Mils Max Min Typ Max A 0.80 1.10 31.5 43.3 A1 0 0.10 0 3.9 A2 0.80 1.00 31.5 39.3 b 0.15 0.30 5.9 11.8 c 0.10 0.18 3.9 7.0 D 1.80 2.20 70.8 86.6 E 1.15 1.35 45.2 43.1 e 0.65 25.6 2.4 70.8 94.5 L 0.10 0.40 3.9 15.7 Q1 0.10 0.40 3.9 15.7 D A1 E HE L b Q1 C 14/16 e e A 1.8 A2 HE TSH122 5 Ordering information Ordering information Table 4. 6 Order codes Part number Temperature range Package Packaging Marking TSH122ICT -40°C to +85°C SC70 Tape & reel K31 Revision history Table 5. Document revision history Date Revision 04-Aug-2008 1 Changes Initial release. 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. 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