MAX11501USA

19-3002; Rev 1; 4/08 KIT ATION EVALU ILABLE AVA Three-Channel, Standard-Definition Video Filters General Description Features o Three-Channel 5th-Order 9MHz Filter for Standard-Definition Video o +6dB Output Buffers o Transparent Input Clamp o AC- or DC-Coupled Inputs o AC- or DC-Coupled Outputs o Flat Passband Response (MAX11501) o +0.8dB Peaking Passband Response (MAX11502) on All Channels o 12kV HBM ESD Protection on Outputs o Single +5V Power Supply o Small 8-Pin SO Package MAX11501/MAX11502 The MAX11501/MAX11502 integrated filters offer three channels of 5th-order filters for standard-definition video and include +6dB output buffers on each channel. These video filters are ideal for anti-aliasing and DAC smoothing in applications such as set-top boxes, security systems, digital video recorders (DVRs), DVD players, and personal video recorders. The MAX11501/MAX11502 video inputs feature a transparent clamp compatible with AC- and DC-coupled input signals and allow DAC outputs to be directly coupled. The 5th-order filters provide a typical -3dB bandwidth of 8.6MHz (MAX11501) and 8.9MHz (MAX11502) and offer either a flat passband response (MAX11501) or a +0.8dB peaking passband response (MAX11502) on all channels. Each channel includes an output buffer with a gain of +6dB capable of driving a full 2VP-P video signal into two standard 150Ω (75Ω back-terminated) video loads. The buffers drive either AC- or DC-coupled loads and assure a blanking level of below 1V after the backmatch resistor. The MAX11501/MAX11502 operate from a single +5V supply and are available in the upper commercial 0°C to +85°C temperature range. These devices are available in small 8-pin SO packages. Ordering Information PART MAX11501USA+ MAX11502USA+ PINPACKAGE 8 SO 8 SO FREQUENCY RESPONSE Flat HF Boost +Denotes a lead-free package. Note: All devices are specified over the 0°C to +85°C operating temperature range. Applications Set-Top Box Receivers Digital Video Recorders (DVRs) Security Video Systems SDTV DVD Players Personal Video Recorders Video On-Demand TRANSPARENT CLAMP IN1 VCC Block Diagram MAX11501 MAX11502 +6dB 9MHz 5TH-ORDER BUTTERWORTH FILTER BUFFER OUT1 IN2 +6dB OUT2 IN3 +6dB OUT3 Typical Operating Circuit and Pin Configuration appear at end of data sheet. GND ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V All other pins to GND ...-0.3V to the lower of (VCC + 0.3V) and +6V Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.9mW/°C above +70°C)................. 470mW Maximum Current into any Pin Except VCC and GND......±50mA Operating Temperature Range MAX1150_USA+ .................................................0°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead temperature (soldering, 10s) ..................................+300°C Junction Temperature ......................................................+150°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +5V, RLOAD = 150Ω to GND, CIN = 0.1µF, TA = 0°C to +85°C, frequency response is relative to 100kHz, unless otherwise noted.) PARAMETER -1dB Bandwidth -3dB Bandwidth Stopband Attenuation Low-Frequency Gain Low-Frequency Gain Match Input Voltage Range Differential Gain Differential Phase Total Harmonic Distortion Channel-to-Channel Crosstalk Signal-to-Noise Ratio Propagation Delay Supply Voltage Range Supply Current Power-Supply Rejection Ratio SYMBOL f1dB f3dB ASB AV AV(MATCH) VIN dG dφ THD XTALK SNR tPD VDD ICC PSRR No load DC (all channels) Referenced to GND if DC-coupled All channels All channels VOUT = 1.8VP-P, f = 1MHz (all channels) f = 1MHz NTC-7 weighting, 100kHz, 4.2MHz f = 4.5MHz 4.75 MAX11501 MAX11502 MAX11501 MAX11502 MAX11501, f = 27MHz MAX11502, f = 27MHz 5.8 CONDITIONS MIN 4.5 5 TYP 7.2 7.8 8.6 8.9 50 48 6.0 0.02 1.4 0.1 0.3 0.1 -80 80 76 5 18 60 5.25 26 6.2 MAX UNITS MHz MHz dB dB dB V % Degrees % dB dB ns V mA dB 2 _______________________________________________________________________________________ Three-Channel, Standard-Definition Video Filters Typical Operating Characteristics (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C.) MAX11501 FREQUENCY RESPONSE MAX11501 toc01 MAX11501/MAX11502 MAX11501 PASSBAND RESPONSE MAX11501 toc02 MAX11501 GROUP DELAY MAX11501 toc03 10 0 -10 RESPONSE (dB) -20 -30 -40 -50 -60 -70 0.1 1 10 9 120 100 80 DELAY (ns) 6 RESPONSE (dB) 3 60 40 0 20 -3 100 0.1 1 FREQUENCY (MHz) 10 FREQUENCY (MHz) 0 0.1 1 10 100 FREQUENCY (MHz) MAX11501 DIFFERENTIAL GAIN, NTSC MAX11501 toc04 MAX11501 DIFFERENTIAL PHASE, NTSC MAX11501 toc05 MAX11501 2T RESPONSE MAX11501 toc06 0.2 0.4 DIFFERENTIAL GAIN (%) 0.1 DIFFERENTIAL PHASE (deg) 0.3 0.2 CH1 0.1 0 -0.1 0 CH2 -0.2 1 2 3 4 STEP 5 6 7 -0.1 1 2 3 4 STEP 5 6 7 200ns/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR MAX11501 MODULATED 12.5T RESPONSE MAX11501 toc07 MAX11501 MULTIBURST RESPONSE MAX11501 toc08 MAX11502 FREQUENCY RESPONSE 0 -10 RESPONSE (dB) -20 -30 -40 -50 MAX11501 toc09 10 CH1 CH1 CH2 -60 CH2 400ns/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR 10μs/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR -70 0.1 1 10 100 FREQUENCY (MHz) _______________________________________________________________________________________ 3 Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 Typical Operating Characteristics (continued) (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C.) MAX11502 PASSBAND RESPONSE MAX11501 toc10 MAX11502 GROUP DELAY MAX11501 toc11 MAX11502 DIFFERENTIAL GAIN, NTSC MAX11501 toc12 9 120 100 80 DELAY (ns) 0.2 DIFFERENTIAL GAIN (%) 6 RESPONSE (dB) 0.1 3 60 40 0 0 20 -3 0.1 1 FREQUENCY (MHz) 10 0 0.1 1 10 100 FREQUENCY (MHz) -0.1 -0.2 1 2 3 4 STEP 5 6 7 MAX11502 DIFFERENTIAL PHASE, NTSC MAX11501 toc13 MAX11502 2T RESPONSE MAX11501 toc14 0.4 DIFFERENTIAL PHASE (deg) 0.3 0.2 CH1 0.1 0 CH2 -0.1 1 2 3 4 STEP 5 6 7 200ns/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR MAX11502 MODULATED 12.5T RESPONSE MAX11501 toc15 MAX11502 MULTIBURST RESPONSE MAX11501 toc16 CH1 CH1 CH2 CH2 400ns/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR 10μs/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR 4 _______________________________________________________________________________________ Three-Channel, Standard-Definition Video Filters Pin Description PIN 1 2 3 4 5 6 7 8 NAME IN1 IN2 IN3 VCC GND OUT3 OUT2 OUT1 FUNCTION Video Input Channel 1 Video Input Channel 2 Video Input Channel 3 Power Supply Ground Video Output Channel 3 Video Output Channel 2 Video Output Channel 1 output amplifier with a gain of two (see the T ypical Operating Circuit). The MAX11501 provides a flat passband response and the MAX11502 features a +0.8dB high-frequency boost at 5MHz on all channels to help with system roll-off. Within the passband, each channel amplifies the signal by two and adds 280mV of offset. VOUT = (2 x VIN) + 0.28V Typical voltage levels are shown in Figures 1 and 2. MAX11501/MAX11502 Inputs Transparent Clamps All inputs feature transparent clamps to allow either AC or DC input coupling. The clamp remains inactive while the input signal is above ground, offering true DC input coupling. If the signal goes below ground, as when the signal is AC-coupled, the internal clamp sets the sync tip at slightly below the ground level. Detailed Description Each channel of the MAX11501/MAX11502 contains a transparent input clamp, an 8.6MHz (MAX11501) or 8.9MHz (MAX11502), 5th-order lowpass filter and an 2.28V OUTPUT SIGNAL MAX11501 MAX11502 IN_ 1.0V 0.88V OUT_ INPUT SIGNAL 0.3V 0.28V 0.0V Figure 1. Typical AC-Coupled Signal _______________________________________________________________________________________ 5 Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 2.32V OUTPUT SIGNAL MAX11501 MAX11502 IN_ 1.02V 0.92V OUT_ INPUT SIGNAL 0.32V 0.02V 0.00V 0.32V Figure 2. Typical DC-Coupled Signal Input Coupling The choice of AC- or DC-coupling the input depends on the video source. Many DACs provide a current output and are terminated to ground with a resistor. Such DAC outputs are conveniently DC-coupled to the MAX11501/MAX11502. Use AC-coupling when the DC level of the video signal is unknown or outside the specified input range of the MAX11501/MAX11502, such as SCART or VCC terminated DAC outputs. ENCODER 0.1μF DAC IN_ MAX11501 MAX11502 DC-Coupled Inputs If the input is DC-coupled, the input voltage must remain above zero but not exceed the maximum input voltage of 1.4V (typical). Figure 3. Simple AC-Coupling for Unipolar Signals (Y, R, G, B) AC-Coupled Inputs If the input is AC-coupled, the transparent clamps are active and set the lowest point of the signal at ground. This is appropriate for unipolar signals such as Y, R, G, or B, with or without sync pulses (Figure 3). For bipolar signals such as Pb and Pr, bias the AC-coupled inputs to a fixed DC voltage, typically 0.59V, to ensure that the transparent clamp remains off. A suitable network is shown in Figure 4. Determine the bias voltage using: VB = R2 × VCC − (IL × R1) , R1 + R2 VCC ENCODER 0.1μF DAC R2 120kΩ R1 820kΩ IN_ MAX11501 MAX11502 ( ) Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr) where IL is the input leakage current (typically 0.5µA). 6 _______________________________________________________________________________________ Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 Standard-Definition Filters The MAX11501/MAX11502 filters are optimized to deliver a flat (MAX11501) or high-frequency boosted (MAX11502) passband and high stopband attenuation. The filter characteristics have been chosen to provide excellent time domain response with low overshoot. The typical -3dB frequency of 8.6MHz (MAX11501) and 8.9MHz (MAX11502) guarantee minimal attenuation in the passband while at the same time offering a 27MHz attenuation of typically -50dB (MAX11501) and -48dB (MAX11502). The MAX11501/MAX11502 outputs are fully protected against short circuits to ground. The short-circuit protection circuitry limits the output current to 80mA (typical) per output. Shorting more than one output to ground simultaneously may exceed the maximum package power dissipation. Junction-Temperature Calculations Die temperature is a function of quiescent power dissipation and the power dissipation in the output drivers. Calculate the power dissipated, PD, using: PD = PDS + PDO1 + PDO2 + PDO3 where PDS is the quiescent power dissipated in the die, and given by: PDS = VCC x ICC and where PDOn is the power dissipated in the nth driver stage and given by: PDOn = Output Buffer The MAX11501/MAX11502 feature output buffers with +6dB of gain. A typical load (Figure 5(a)) is a 75Ω backmatch resistor, an optional 220µF or larger AC-coupling capacitor, a transmission line, and a 75Ω termination resistor. The MAX11501/MAX11502 clamp the signal, forcing the blanking level to less than 1V at the termination resistor. This allows direct drive of video loads at digital TV specifications without the need for costly ACcoupling capacitors. The MAX11501/MAX11502 drive two parallel loads per output (Figure 5(b)), but thermal considerations must be taken into account when doing so (see the Junction-Temperature Calculations section). (VCC − VORMSn ) × VORMSn RLn Applications Information Output Configuration The MAX11501/MAX11502 outputs may be either DC- or AC-coupled. When the outputs are AC-coupled, choose a capacitor that passes the lowest frequency content of the video signal, and keeps the line-time distortion within desired limits. The capacitor value is a function of the input leakage and impedance of the circuit being driven. The MAX11501/MAX11502 easily drive the industry common 220µF, or larger, coupling capacitor. If any or all outputs are driving two parallel loads, see the JunctionTemperature Calculations section. where VORMSn is the RMS output voltage and RLn is the load resistance. The following is an example of a junction-temperature calculation, assuming the following conditions: 1) Video standard = 525/60/2:1. 2) Video format = RGB with syncs on all. 3) Picture content = 100% white. 4) The input signal is AC-coupled. 5) 6) 7) The output signal is DC-coupled. VCC = 5.0V. ICC = 26mA. 75Ω 220μF (OPTIONAL) MAX11501 MAX11502 OUT_ 75Ω 220μF (OPTIONAL) MAX11501 MAX11502 OUT_ 75Ω 75Ω 220μF (OPTIONAL) 75Ω 75Ω (a) (b) Figure 5. Typical Output Loads _______________________________________________________________________________________ 7 Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 A sync tip exists at 280mV and peak white exists at 2.28V. The RMS voltage is approximately 1.88V on each output (80% of the peak-to-peak voltage, plus the offset) giving: PDS = 5 x 0.026 = 0.13W PDOn = and PD = 0.13 + 0.078 + 0.078 + 0.078 = 0.364W The junction temperature is given by: TJ = TA + (RθJA x PD) where TJ is junction temperature, TA is ambient temperature (assume +70°C), and RθJA is thermal resistance junction to ambient. From the Absolute Maximum Ratings section of the data sheet, the derating factor is 5.9mW/°C above +70°C. RθJA = 1/(derating factor) = 1/(5.9mW/°C) = 170°C/W (derating and maximum power dissipation are based on minimum PCB copper and indicate worst case). Therefore: TJ = 70 + (170 x 0.364) = +132°C In this example, the die temperature is below the absolute maximum allowed temperature. It is unlikely under normal circumstances that the maximum die temperature will be reached, however it is possible if tolerances of VCC, RL, input voltage etc. are considered and the ambient temperature is high. Changing the above example to a single video load on each output results in: TJ = +112°C (5 − 1.88) × 1.88 75 = 0.078W PCB Layout Recommendations To help with heat dissipation, connect the power and ground traces to large copper areas. Bypass VCC to GND with 0.1µF and 1.0µF capacitors. Surface-mount capacitors are recommended for their low inductance. Place traces carrying video signals appropriately to avoid mutual coupling. When AC-coupling the inputs, place the capacitors as close as possible to the device and keep traces short to minimize parasitic capacitance and inductance. For a recommended PCB layout, refer to the MAX11501/MAX11502 evaluation kit datasheet. 8 _______________________________________________________________________________________ Three-Channel, Standard-Definition Video Filters Pin Configuration TOP VIEW MAX11501/MAX11502 IN1 IN2 IN3 1 2 3 + 8 7 OUT1 OUT2 OUT3 GND MAX11501 MAX11502 6 5 VCC 4 SO Typical Operating Circuit +5V VCC ENCODER 0.1μF* DAC 75Ω IN1 TRANSPARENT CLAMP MAX11501 MAX11502 +6dB 9MHz 5TH-ORDER BUTTERWORTH FILTER BUFFER OUT1 75Ω 220μF* 75Ω 0.1μF* DAC 75Ω IN2 +6dB OUT2 75Ω 220μF* 75Ω 0.1μF* DAC 75Ω IN3 +6dB OUT3 75Ω 220μF* 75Ω GND *OPTIONAL CAPACITORS _______________________________________________________________________________________ 9 Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502 Package Information For the latest package outline information, go to www.maxim-ic.com/packages. PACKAGE TYPE 8 SO PACKAGE CODE S8+2 DOCUMENT NO. 21-0041 10 ______________________________________________________________________________________ Three-Channel, Standard-Definition Video Filters Revision History REVISION NUMBER 0 1 REVISION DATE 12/07 4/08 Initial release Updated Block Diagram DESCRIPTION PAGES CHANGED — 1 MAX11501/MAX11502 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Heaney