NCS2561 3.3V Single Channel Video Driver with Recontruction Filter and SAG Correction The NCS2561 is a single high speed video driver including a 2-pole reconstruction filter and SAG correction capability. The NCS2561 is available in a space saving SC-88 package optimized for low voltage, portable applications. It is designed to be compatible with Digital-to-Analog Converters (DAC) embedded in most video processors. The NCS2561 internally integrates an 8 MHz 2-pole video DAC reconstruction filter with a fixed gain of 2. The NCS2561 also has a built-in SAG correction circuit when used at the output in an AC-coupled mode. To further reduce power consumption, an enable pin is provided. Features •Internal 8 MHz 2-Pole Reconstruction Filter •Internal Fixed Gain: 6 dB •Integrated Level Shifter •SAG Correction Circuit for Reducing Coupling Capacitor Size •Low Quiescent Current: 6 mA Typ •Shutdown Current < 5 mA •Wide Input Voltage Range •Capability to Drive 2 CVBS Video Signals Together (2x150W Loads) •Excellent Video Performance •Operating Supply Voltage Range: +2.7 V to +3.3 V •Space-Saving SC-88 Package •Pin-Compatible with Similar Competitive Devices •This is a Pb-Free Device http://onsemi.com MARKING DIAGRAMS YG1 MG G 1 YG1 = Specific Device Code M = Date Code* G = Pb-Free Package (Note: Microdot may be in either location) *Date Code orientation and/or position may vary depending upon manufacturing location. PIN CONNECTIONS 1 6 2 5 3 4 IN VCC GND Enable SAG OUT Top View Applications •Portable Video •Digital Cameras •Camera Phones •Set-Top Box Video Filters •NTSC and PAL ORDERING INFORMATION Device NCS2561SQT1G Vcc 2.7V to 3.3V Enable 6 5 NCS2561 IN 6 1 SC-88 SQ SUFFIX CASE 419B Package Shipping SC-88 3000 / Tape & Reel (Pb-Free) †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. + 1 Level Shifter 2-pole filter 4 OUT 3 SAG - 2 GND Figure 1. Block Diagram © Semiconductor Components Industries, LLC, 2008 February, 2008 - Rev. 1 1 Publication Order Number: NCS2561/D NCS2561 PIN FUNCTION AND DESCRIPTION Pin Name Type Description 1 IN Input 2 GND Ground Ground 3 SAG Output Sag Compensation 4 OUT Output Video Output 5 Enable Input 6 VCC Power Video Input Enable / Disable Function: High = Enable, Low = Disable. When left open the default state is High. Power Supply / 2.7 V < VCC < 3.3 V ATTRIBUTES Characteristic Value Human Body Model, R = 1000 W, C = 100 pF Machine Model ESD Protection 2 kV 200 V Moisture Sensitivity (Note 1) Flammability Rating Level 1 Oxygen Index: 28 to 34 UL 94 V-0 @ 0.125 in 1. For additional Moisture Sensitivity information, refer to Application Note AND8003/D. MAXIMUM RATINGS Rating Symbol Value Unit VCC 3.6 Vdc Input Voltage Range VI -0.5 to VCC + 0.5 Vdc Output Short-Circuit to GND thru 75 W ISC Continuous - Power Supply Voltages Maximum Junction Temperature (Note 2) TJ 150 °C Operating Ambient Temperature TA -40 to +125 °C Storage Temperature Range Tstg -60 to +150 °C Thermal Resistance, Junction-to-Air RqJA 250 °C/W Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 2. Power dissipation must be considered to ensure maximum junction temperature (TJ) is not exceeded. MAXIMUM POWER DISSIPATION soon as the die temperature is reduced. Leaving the device in the “overheated” condition for an extended period can result in device burnout. To ensure proper operation, it is important to observe the de-rating curves. The maximum power that can be safely dissipated is limited by the associated rise in junction temperature. For the plastic packages, the maximum safe junction temperature is 150°C. If the maximum is exceeded momentarily, proper circuit operation will be restored as http://onsemi.com 2 NCS2561 DC ELECTRICAL CHARACTERISTICS with VCC = 2.7 V to 3.3 V (TA = +25°C, RL = 150 W to GND, unless otherwise specified) Characteristic Symbol Conditions Min Typ Max Unit VCC = 3.3 V, VIN = 0 V 10 60 60 80 mV DC PERFORMANCE VOLS Offset Level-Shift Output Voltage TA = -40°C to +125°C (Note 3) IIB Input Bias Current VIN Input Voltage Range (Note 4) AV Voltage Gain VIH Enable Input High Level Voltage VIL Enable Input Low Level Voltage ±3 VCC = 3.3 V GND VCC = 3.3 V, 0 < VIN < 1.5 V 40 IRE Sync, 100 IRE White Level 5.8 pA VCC - 1.5 V 6.2 dB 1.6 VCC V GND 0.8 V 6.0 OUTPUT CHARACTERISTICS VOH Output High Level Voltage VOL Output Low Level Voltage (Note 5) IO Output Current RL = 150 W to GND RL = 75 W to GND VCC - 0.3 VCC = 3.3 V VCC - 0.1 VCC - 0.3 V 60 mV ±50 mA POWER SUPPLY VCC Operating Voltage Range 2.7 3.3 V ICC, ON Power Supply Current - Enabled TA = -40°C to +125°C (Note 3) VIN = 0 V, VCC = 3.3 V, IO = 0 mA 6.0 7.5 9.0 mA ICC, Power Supply Current - Disabled VIN = 0 V, VCC = 3.3 V, IO = 0 mA 1.5 5.0 mA VCC = 2.7 V to 3.3 V ±80 OFF PSRR Power Supply Rejection Ratio mV/V 3. Guaranteed by design and/or characterization. 4. Limited by output swing and internal gain. 5. Output low voltage level is limited by the internal level shift circuitry. AC ELECTRICAL CHARACTERISTICS with VCC = 2.7 V to 3.3 V (TA = +25°C, RL = 150 W to GND, unless otherwise specified) Symbol Characteristic Conditions Min Typ Max Unit -0.4 -0.2 -18 0 +0.4 -22 +0.4 +0.8 dB FREQUENCY DOMAIN PERFORMANCE An Normalized Passband Gain (Note 6) VCC=3.3 V, f=1.0 MHz , VO=2 Vp-p VCC=3.3 V, f=4.5 MHz , VO=2 Vp-p f = 27 MHz, VO = 2 Vp-p dG Differential Gain VCC = 3.3 V, AV = +2, RL = 150 W, f = 3.58 MHz, 4.43 MHz 0.5 % dP Differential Phase VCC = 3.3 V, AV = +2, RL = 150 W, f = 3.58 MHz, 4.43 MHz 1.0 ° VCC = 3.3 V, 100% White Signal 70 dB VCC = 3.3 V, 100 kHz to 5.0 MHz 15 ns SNR Signal to Noise Ratio TIME DOMAIN RESPONSE DTg Group Delay Variation tON Turn ON Time 1.5 ms tOFF Turn OFF Time 50 ns 6. The normalized gain is guaranteed by design and characterization. The max normalized gain of +0.8 dB is the result of smooth peaking (pre-emphasis, see figure 2) taking into account the increase of the losses at the highest frequencies into connectors and cable at the output. For frequencies lower than 2 MHz the max normalized gain is 0.4 dB. http://onsemi.com 3 NCS2561 TYPICAL CHARACTERISTICS (At TA = +25°C and RL = 150 W, unless otherwise specified) Figure 2. Frequency Response Figure 3. Group Delay vs. Frequency Figure 4. Differential Gain Figure 5. Differential Phase Figure 6. PSRR vs. Frequency Figure 7. Quiescent Current vs. Supply Voltage http://onsemi.com 4 NCS2561 Figure 8. Quiescent Current vs. Temperature (VCC = 3.0 V) Figure 9. Signal-to-Noise Ratio vs. Temperature http://onsemi.com 5 NCS2561 APPLICATIONS INFORMATION To ensure the output signal is not clipped due to the lower rail limit, the NCS2561 has built-in level shift circuitry. The role of this circuitry is to avoid clipping of the sync signal at the output by shifting up the video signal by about 60 mV. The level shift circuitry level shifts the sync signal above the internal op amp transistor saturation limit. This function is particularly useful when the video signal is DC-coupled at the output. The NCS2561 is a single video driver optimized for portable applications with low power consumption in a space saving SC-88 package. It includes sag correction circuitry allowing significant reduction of the AC-coupled output capacitor. Internal Level Shift The input common mode voltage range (see specifications VIN) of the NCS2561 includes the lower rail (GND) and extends to VCC - 1.5V on a power supply range of 2.7 V to 3.3 V. Many video processors operate with a supply ranging from 0 V to a positive supply (typically 3.3 V), so the lowest voltage of the video signal provided by the DAC is 0 V. Although a 0 V (GND) signal is within the input common-mode range of the NCS2561, the output signal will be limited, specifically at the lower rail. Op amps use transistors with saturation voltage (Vsat) higher than 0 V. If the lowest level of the input voltage is lower than Vsat the signal will be clipped at the output. 1 Vpp VCC 2.7V to 3.3V Video DAC Built-in 2-Pole Reconstruction Filter The NCS2561 has a 2-pole reconstruction filter with a -3 dB cut-off frequency at 8 MHz. The filter serves as an anti-alias filter removing the unwanted over-sampling effects produced by the video DAC. The 27 MHz over-sampling frequency from the video DAC is attenuated by 22 dB typical. In order to improve the stop-band attenuation a small capacitor (Cs) of a few tenths pico Farads can be added in parallel with the source resistor (Rs) (See Figure 10). Enable 1V 10 pF 0V IN 1.4 kW + Rs OUT 12 pF - Cs TV 47 mF / 67 mF 1.1 kW 75 W 845 W SAG 325 W Cs: Optional 528 W 75 W 22 mF 650 W NCS2561 GND Figure 10. Block Diagram Showing Filter and Sag Correction Circuits Shutdown Mode this video output is not permanently used and actually used in very specific period of time when pictures or small movies want to be displayed on a bigger screen. The device's quiescent current drops typically down to 2.7 mA when the device is in the shutdown mode. If the Enable pin is left open by default the circuit will be enabled. The Enable pin offers a shutdown function, so the NCS2561 can consequently be disabled when not used. This is particularly important for digital still cameras or cell phones with camera having a video output feature. Indeed http://onsemi.com 6 NCS2561 Sag Correction capacitors, and a coupling configuration to saving space. The sag compensation circuitry allows the reduction of this output coupling capacitor value by inducing peaking at the lower cutoff frequency of the high pass filter. The high-pass filter is created by the coupling capacitor and the load resistor (1/(2pRLCout), and this peaking lowers the cutoff frequency. Simulation results provided in Figure 11 show the effect of the sag compensation at the low cut-off frequency. Video drivers that do not incorporate sag compensation traditionally recommend a large coupling capacitor (220 mF) on the output of the video driver. Larger output coupling capacitors (≥ 470 mF) are often chosen by design engineers when the application allows this (Set-Top Box). A larger output coupling capacitor allows a lower cut-off frequency to avoid field tilt effects; however in portable applications there is a trade-off between large and expensive coupling Gain VS Frequency 20 15 10 Gain (dB) 5 0 -5 -10 -15 -20 -25 -30 1 10 100 1000 10000 100000 1000000 10000000 1E+08 Frequency (Hz) Cout = 22uF Cout = 47uF Cout = 67uF Cout = 100uF Cout = 220uF Figure 11. Simulation Results with Csag = 22 mF and Variable Cout Calculations show that a 220 mF output capacitor produces a low cutoff frequency of 5 Hz, and a 470 mF capacitor will give a low cutoff frequency at 2.6 Hz. The cutoff frequency (-3 dB) is defined by the equation: 1/(2pRLCout). In the case where no sag is used (Figure 14), a low Cout value can adversely affect the low cutoff frequency; the cut-off frequency will be in the critical 50 Hz or 60 Hz frequencies. This undesirable affect will manifest itself as field tilt. Due to the SAG correction the large output capacitor is reduced without degrading the video performances by the use of two smaller and cheaper output capacitors. Video DAC 1 Vpp Vcc 2.7V to 3.3V 1V NCS2561 0V IN Rs Enable Vcc Enable + Level Shifter 2-pole filter TV OUT 47 mF / 67 mF 75 W - 75 W SAG GND Figure 12. Sag Correction Configuration http://onsemi.com 7 22 mF NCS2561 The Csag value has no significant impact on the coupling even as the value increases. A value of 22 mF is recommended for optimal performance. To achieve similar behavior to an output coupling capacitor value Cout = 220 mF (no sag) the nominal equivalent sag combination is Csag = 22 mF and Cout = 67 mF. A value of 47 mF for Cout will yield equivalent results. If we consider a coupling cap of 470 mF, the best compromise for sag combination is Csag = 22 mF and Cout = 100 mF. A value of 67 mF for Cout will yield equivalent results. Figures 13 and 14 show the impact of the output coupling capacitor on a video signal corresponding to a worst case situation regarding the low frequency bandwidth. The video signal used is a 50 Hz 1/2 black - 1/2 white video pattern. This signal is obtained using the PAL Flat Field Square wave signal option available with the video generator TG700 from Tektronix. These measurements show how the sag function can help to reduce the field tilt problem using lower value coupling capacitor than traditional approach. Figure 14. Csag = 22 mF, Cout = 47 mF (Top : Input, Bottom : Output) Figure 13. No sag, Cout = 220 mF (Top : Input, Bottom : Output) Video DAC 1 Vpp Vcc 2.7V to 3.3V 1V NCS2561 0V IN Rs Enable Vcc Enable + Level Shifter 2-pole filter OUT 220mF / 470mF TV 75 W - 75 W SAG GND Figure 15. NCS2561 in an AC-Coupled Configuration with no sag http://onsemi.com 8 NCS2561 DC-Coupled Output The problems of field tilt effects on the video signal are also eliminated providing the best video quality with optimal dynamic or peak-to-peak amplitude of the video signal allowing operating at the lower power supply voltage (2.7 V) without risk of signal clipping. In this coupling configuration the average output voltage is higher than 0 V and the power consumption can be a little higher than with an AC-coupled configuration. Having efficient output AC-coupled capability thanks to the sag correction option, with the built-in level shifter, the NCS2561 can also be DC-coupled to a 150 W load. This has the advantage of eliminating the AC-coupling capacitors at the output by reducing the number of external components and saving space on the board. This can be a key advantage for some portable applications with limited space. Video DAC 1 Vpp Vcc 2.7V to 3.3V 1V NCS2561 0V IN Vcc Enable + Level Shifter Rs Enable TV OUT 2-pole filter 75 W - 75 W SAG GND Figure 16. DC-Coupled Input and Output Configuration Video Driving Capability applications is illustrated in the Figure 17. Figure 18 (multiburst) and Figure 19 (linearity) show that the video signal can efficiently drive a 75 W equivalent load and not degrade the video performance. With an output current capability of ±50 mA the NSC2561 was designed to be able to drive at least 2 video display loads in parallel (2 different display or 1 display + 1 VCR). This Video DAC 1 Vpp Vcc 2.7V to 3.3V 1V NCS2561 0V IN Rs Enable Vcc Enable + Level Shifter 2-pole filter OUT 75 W 47 mF / 67 mF TV 75 W - SAG 22 mF 75 W Other Video Display 75 W GND Figure 17. NCS2561 Driving 2 Video Display (two 150 W loads) http://onsemi.com 9 NCS2561 Figure 18. Multiburst Test with two 150 W loads Figure 19. Linearity Test with two 150 W loads ESD Protection more than 4 kV has been measured on this specific output pin. This feature is particularly important for video driver which usually constitutes the last stage in the video chain before the video output connector. All the device pins are protected against electrostatic discharge at a level of 2 kV HBM. The output has been considered with a particular attention with ESD structure able to sustain typically more than 2 kV HBM. Actually http://onsemi.com 10 NCS2561 PACKAGE DIMENSIONS SC-88/SC70-6/SOT-363 CASE 419B-02 ISSUE W D NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. 419B-01 OBSOLETE, NEW STANDARD 419B-02. e 6 5 4 HE DIM A A1 A3 b C D E e L HE -E1 2 3 b 6 PL 0.2 (0.008) M E M A3 MILLIMETERS MIN NOM MAX 0.80 0.95 1.10 0.00 0.05 0.10 0.20 REF 0.10 0.21 0.30 0.10 0.14 0.25 1.80 2.00 2.20 1.15 1.25 1.35 0.65 BSC 0.10 0.20 0.30 2.00 2.10 2.20 INCHES NOM MAX 0.037 0.043 0.002 0.004 0.008 REF 0.004 0.008 0.012 0.004 0.005 0.010 0.070 0.078 0.086 0.045 0.049 0.053 0.026 BSC 0.004 0.008 0.012 0.078 0.082 0.086 MIN 0.031 0.000 C A A1 L SOLDERING FOOTPRINT* 0.50 0.0197 0.65 0.025 0.65 0.025 0.40 0.0157 1.9 0.0748 SCALE 20:1 mm Ǔ ǒinches *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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