19-4346; Rev 0; 10/08 KIT ATION EVALU E L B A IL AVA Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer Features The MAX11508/MAX11509 integrated 3-channel video filters for high-definition (HD), progressive-scan (PS), standard-definition (SD), and bypass (BP) video include an output buffer with +6dB gain and are ideal for digital video disc (DVD) players, set-top box (STB) receivers, high-definition television (HDTV), digital video recorders (DVRs), and similar devices. ♦ Three Selectable 6th-Order 9MHz/16MHz/33MHz (SD/PS/HD) Filters The MAX11508/MAX11509 video inputs feature a transparent clamp compatible with AC- and DC-coupled input signals and allow DAC outputs to be directly coupled, eliminating the need for bulky coupling capacitors. The filter bandwidths are selectable to HD, PS, and SD. A BP mode is provided for 1080p and highbandwidth RGB signals. Selectable input bias circuitry on 2 filter channels offers simple connection to bipolar video signals such as C, Pb, and Pr. The MAX11508 filters provide -3dB bandwidths of 9MHz (SD), 16MHz (PS), 33MHz (HD), and 60MHz (BP). The MAX11509 filters provide -3dB bandwidths of 10MHz (SD), 17MHz (PS), 34MHz (HD), and 60MHz (BP). Each channel includes an output buffer with +6dB gain that provides a full 2VP-P video signal into a 150Ω video load. The buffers drive either AC- or DC-coupled loads and assure a blanking level of below 1V after the backmatch resistor. The shutdown mode provided reduces device current to 1µA (typ). The MAX11508 offers a flat passband and the MAX11509 features +0.8dB peaking to compensate for DAC rolloff. The MAX11508/MAX11509 operate from a 5V power supply and operate over the upper commercial (0°C to +85°C) temperature range. The parts are offered in the 14-pin TSSOP package. ♦ ±12kV HBM ESD Protection on Outputs Applications Cable and Satellite STB Receivers HDTV ♦ Bypass Mode for High Bandwidth Signals ♦ Transparent Input Clamp ♦ Output Buffers Drive a Standard 150Ω Video Load ♦ AC- or DC-Coupled Inputs ♦ AC- or DC-Coupled Outputs ♦ +0.8dB Peaking Passband Response (MAX11509) in SD, PS, and HD Modes ♦ Single +5V Power Supply ♦ Lead-Free, 14-Pin TSSOP Package Ordering Information PART TEMP RANGE MAX11508UUD+ 0°C to +85°C 14 TSSOP PIN-PACKAGE MAX11509UUD+ 0°C to +85°C 14 TSSOP +Denotes a lead-free/RoHS-compliant package. Pin Configuration TOP VIEW + VCC 1 14 N.C. FSEL0 2 Y/G_IN 3 DVD Players Pb/B_IN 4 Personal Video Recorders Pr/R_IN 5 13 FSEL1 MAX11508 MAX11509 12 Y/G_OUT 11 Pb/B_OUT 10 Pr/R_OUT DVRs BIAS 6 9 SHDN Video-On-Demand N.C. 7 8 GND HD Recorders TSSOP Typical Operating Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX11508/MAX11509 General Description MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer 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) 14-Pin TSSOP (derate 10mW/°C above +70°C) .......796.8mW Maximum Current into Any Pin Except VCC and GND .....±50mA Operating Temperature Range…. ..........................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, all frequency responses are relative to 100kHz, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 4.75 24 35 mA 5.00 5.25 V DC CHARACTERISTICS Supply Current ICC Supply Voltage Range VDD Input Voltage Range VIN Power-Down Current IPD Digital Input High Voltage VIH Digital Input Low Voltage VIL No load Referenced to GND if DC-coupled 1.4 BIAS = high 1 BIAS = low 15 V µA 2.0 V 0.8 V STANDARD-DEFINITION VIDEO -1dB Bandwidth f1dB -3dB Bandwidth f3dB Stopband Attenuation ASB MAX11508, TA = +25°C 4.5 7.9 MAX11509, TA = +25°C 5 8.6 MAX11508 9.0 MAX11509 10 f = 27MHz 35 5.6 MHz MHz 48 Low-Frequency Gain AV No load Differential Gain dG All channels 0.7 % Differential Phase dφ All channels 0.7 Degrees THD VOUT = 1.4VP-P, f = 1MHz, all channels -60 dB SNR 2VP-P signal to RMS noise, f = 100kHz to 4.2MHz 71 dB Total Harmonic Distortion Signal-to-Noise Ratio Group Delay Power-Supply Rejection Ratio 2 tG PSRR 6.0 dB 6.6 dB f = 4.5MHz 59 ns DC, all channels 50 dB _______________________________________________________________________________________ Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer (VCC = +5V, RLOAD = 150Ω to GND, CIN = 0.1µF, TA = 0°C to +85°C, all frequency responses are relative to 100kHz, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX11508, TA = +25°C 9 13.5 MAX11509, TA = +25°C 10 14 MAX UNITS PROGRESSIVE-SCAN VIDEO -1dB Bandwidth f1dB -3dB Bandwidth f3dB Stopband Attenuation ASB Low-Frequency Gain AV MAX11508 16 MAX11509 17 f = 54MHz MHz MHz 44 5.6 6.0 dB 6.6 dB Total Harmonic Distortion THD VOUT = 1.4VP-P, f = 7MHz -55 dB Signal-to-Noise Ratio SNR 2VP-P signal to RMS noise, f = 100kHz to 15MHz 66 dB f = 10MHz 47 ns Group Delay tG HIGH-DEFINITION VIDEO -1dB Bandwidth f1dB -3dB Bandwidth f3dB Stopband Attenuation Low-Frequency Gain Total Harmonic Distortion Signal-to-Noise Ratio Group Delay ASB MAX11508, TA = +25°C 21 30 MAX11509, TA = +25°C 22 31 MAX11508 33 MAX11509 34 f = 37.125MHz 6.5 f = 44.25MHz 14.5 f = 74.25MHz 45 AV THD SNR tG 5.4 6.0 MHz MHz dB 6.6 dB VOUT = 1.4VP-P, f = 10MHz -55 VOUT = 1.4VP-P, f = 15MHz -50 VOUT = 1.4VP-P, f = 22MHz -40 2VP-P signal to RMS noise, f = 100kHz to 30MHz 65 dB f = 20MHz 25 ns 60 MHz dB BYPASS VIDEO (Note 2) -3dB Bandwidth f3dB Low-Frequency Gain AV 5.4 6.0 6.6 dB Total Harmonic Distortion THD VOUT = 1.4VP-P, f = 22MHz -40 dB Signal-to-Noise Ratio SNR 2VP-P signal to RMS noise, f = 100kHz to 30MHz 65 dB Note 1: All devices are 100% production tested at TA = +25°C. Note 2: Output AC-coupled with 220µF into 150Ω to GND. _______________________________________________________________________________________ 3 MAX11508/MAX11509 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C, unless otherwise noted.) 0 10 MAX11508 toc02 7 MAX11508 toc01 10 MAX11509 SD FREQUENCY RESPONSE MAX11508 SD PASSBAND RESPONSE 5 0 -10 -20 -30 RESPONSE (dB) RESPONSE (dB) -10 RESPONSE (dB) MAX11508 toc03 MAX11508 SD FREQUENCY RESPONSE 3 1 -20 -30 -40 -40 -1 -50 -50 -60 -3 -60 1 10 0.1 100 1 0.1 10 1 10 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX11509 SD PASSBAND RESPONSE MAX11508 PS FREQUENCY RESPONSE MAX11508 PS PASSBAND RESPONSE 5 7 0 100 MAX11508 toc06 10 MAX11508 toc04 7 MAX11508 toc05 0.1 5 3 1 RESPONSE (dB) RESPONSE (dB) RESPONSE (dB) -10 -20 -30 3 1 -40 -1 -1 -50 -3 -3 -60 0.1 1 10 0.1 1 10 0.1 100 1 10 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX11509 PS FREQUENCY RESPONSE MAX11509 PS PASSBAND RESPONSE MAX11508 HD FREQUENCY RESPONSE 5 100 MAX11508 toc09 0 10 MAX11508 toc08 7 MAX11508 toc07 10 0 -10 -20 -30 RESPONSE (dB) RESPONSE (dB) -10 RESPONSE (dB) MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer 3 1 -20 -30 -40 -40 -1 -50 -50 0.1 1 10 FREQUENCY (MHz) 4 -60 -3 -60 100 0.1 1 10 FREQUENCY (MHz) 100 0.1 1 10 FREQUENCY (MHz) _______________________________________________________________________________________ 100 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer 5 7 MAX11508 toc11 10 MAX11508 toc10 7 MAX11509 HD PASSBAND RESPONSE MAX11509 HD FREQUENCY RESPONSE 0 MAX11508 toc12 MAX11508 HD PASSBAND RESPONSE 5 3 1 RESPONSE (dB) RESPONSE (dB) RESPONSE (dB) -10 -20 -30 3 1 -40 -1 -1 -50 -3 -3 -60 1 10 100 0.1 1 10 0.1 100 10 FREQUENCY (MHz) FREQUENCY (MHz) MAX11508 BP FREQUENCY RESPONSE MAX11508 BP PASSBAND RESPONSE MAX11509 BP FREQUENCY RESPONSE 0 5 100 10 MAX11508 toc15 7 MAX11508 toc13 10 0 -10 -20 -30 RESPONSE (dB) RESPONSE (dB) -10 RESPONSE (dB) 1 FREQUENCY (MHz) MAX11508 toc14 0.1 3 1 -20 -30 -40 -40 -1 -50 -50 -60 -3 1 10 0.1 100 1 10 FREQUENCY (MHz) FREQUENCY (MHz) MAX11509 BP PASSBAND RESPONSE MAX11508 SD GROUP DELAY vs. FREQUENCY 120 MAX11508 toc16 7 5 0.1 100 100 120 100 60 40 -20 -20 1 10 FREQUENCY (MHz) 100 40 0 0 0.1 60 20 20 -1 -3 100 80 DELAY (ns) DELAY (ns) RESPONSE (dB) 1 10 MAX11509 SD GROUP DELAY vs. FREQUENCY 80 3 1 FREQUENCY (MHz) MAX11508 toc17 0.1 MAX11508 toc18 -60 0.1 1 10 100 0.1 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) _______________________________________________________________________________________ 5 MAX11508/MAX11509 Typical Operating Characteristics (continued) (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C, unless otherwise noted.) 20 0 40 20 -40 -20 0.1 1 10 100 0 -20 0 -20 0.1 1 10 0.1 100 10 100 FREQUENCY (MHz) FREQUENCY (MHz) MAX11509 HD GROUP DELAY vs. FREQUENCY MAX11508 BP GROUP DELAY vs. FREQUENCY MAX11509 BP GROUP DELAY vs. FREQUENCY 20 -20 DELAY (ns) DELAY (ns) 20 0 0 -40 -40 0.1 1 10 100 0 -20 -20 -40 MAX11508 toc24 40 MAX11508 toc23 MAX11508 toc22 40 20 0.1 1 10 0.1 100 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX11508 SD DIFFERENTIAL GAIN, NTSC MAX11508 SD DIFFERENTIAL PHASE, NTSC MAX11509 SD DIFFERENTIAL GAIN, NTSC 0.4 0.2 0 -0.2 -0.4 1.0 0.6 0.4 0.2 0 -0.2 -0.4 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.6 -0.6 -0.8 -0.8 -0.8 -1.0 -1.0 -1.0 2 3 4 STEP 5 6 7 MAX11508 toc27 0.8 DIFFERENTIAL GAIN (%) 0.6 1.0 MAX11508 toc26 0.8 DIFFERENTIAL PHASE (deg) MAX11508 toc25 1.0 1 1 FREQUENCY (MHz) 40 DELAY (ns) 20 DELAY (ns) 40 40 MAX11508 toc20 60 DELAY (ns) 60 DELAY (ns) 80 MAX11508 toc19 80 6 MAX11508 HD GROUP DELAY vs. FREQUENCY MAX11509 PS GROUP DELAY vs. FREQUENCY MAX11508 toc21 MAX11508 PS GROUP DELAY vs. FREQUENCY DIFFERENTIAL GAIN (%) MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer 1 2 3 4 STEP 5 6 7 1 2 3 4 STEP _______________________________________________________________________________________ 5 6 7 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11509 SD DIFFERENTIAL PHASE, NTSC MAX11508 toc30 MAX11508 toc29 MAX11508 toc28 1.0 0.8 DIFFERENTIAL PHASE (deg) MAX11509 SD 2T RESPONSE MAX11508 SD 2T RESPONSE 0.6 IN IN 0.4 0.2 CH1 0 CH1 -0.2 -0.4 OUT OUT -0.6 -0.8 CH2 CH2 -1.0 1 2 3 4 5 6 STEP 7 200ns/div CH1: INPUT, 200mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 200mV/div 200ns/div CH1: INPUT, 200mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 200mV/div Pin Description PIN NAME 1 VCC FUNCTION Power-Supply Input 2 FSEL0 Frequency-Select Input. LSB for bandwidth selection. 3 Y/G_IN Video Input Channel 1 4 Pb/B_IN Video Input Channel 2 5 Pr/R_IN Video Input Channel 3 6 BIAS Bias Control Digital Input. Enables voltage bias for the Pb/B and Pr/R channels. Force BIAS low to enable voltage bias and disable the input clamps. Force BIAS high to disable voltage bias and enable the input clamps. 7, 14 N.C. No Connection. Not internally connected. 8 GND Ground 9 SHDN Shutdown Digital Input. SHDN places the device into a powered-down state. Force SHDN low to enable shutdown. Force SHDN high for normal operation. 10 Pr/R_OUT Video Output Channel 3 11 Pb/B_OUT Video Output Channel 2 12 Y/G_OUT Video Output Channel 1 13 FSEL1 Frequency Select Input. MSB for bandwidth selection. _______________________________________________________________________________________ 7 MAX11508/MAX11509 Typical Operating Characteristics (continued) (VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C, unless otherwise noted.) MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer Detailed Description The MAX11508/MAX11509 integrated filters offer 3 channels of SD, PS, or HD video, and include a bypass mode useful for high-bandwidth 1080p and RGB video signals. The MAX11508 6th-order lowpass filters provide -3dB bandwidths of 9MHz (SD), 16MHz (PS), 33MHz (HD), and 60MHz (BP). The MAX11509 6th-order lowpass filters provide -3dB bandwidths of 10MHz (SD), 17MHz (PS), 34MHz (HD), and 60MHz (BP). Two control inputs, FSEL0 and FSEL1, select the filter mode for all filters (Table 1). Input bias circuitry on 2 filter channels can be enabled through the BIAS input to offer simple connection to bipolar video signals such as C, Pb, and Pr. Shutdown mode reduces device current to 1µA (typ) and is enabled by forcing SHDN low. Figure 1 shows a simplified block diagram of the MAX11508/MAX11509. The MAX11508 provides a flat passband response and the MAX11509 provides a +0.8dB high-frequency boost at 5MHz (SD), 8.5MHz (PS), and 20MHz (HD) to help with system rolloff. No frequency boost is included in bypass mode. Typical voltage waveforms are shown in Figures 2 and 3. connects to the input node when BIAS is forced low. Figures 4 and 5 show how the bias network operates. DC-Coupled Inputs When the input is DC-coupled, the voltage must remain above zero, but not to exceed 1.4V (typ). AC-Coupling and BIAS When 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 CVBS, Y, R, G, or B, with sync pulses (Figure 4). Force BIAS high when coupling unipolar signals. For bipolar signals, such as Pb and Pr, a bias network is provided within the MAX11508/MAX11509 for inputs Pb/B_IN and Pr/R_IN. Force BIAS low to connect the bias network to these inputs (Figure 5). The internal network biases AC-coupled inputs to a fixed DC voltage, typically 0.59V, to ensure that the transparent clamp remains off. VCC Y/G_IN TRANSPARENT CLAMP Y/G_OUT 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz) Inputs MAX11508 MAX11509 Transparent Clamps All inputs feature transparent clamps to allow either ACor DC-coupling of the inputs. The clamp remains inactive while the input signal is above ground, offering true DC input coupling. When the signal goes below ground, as is the case when it is AC-coupled, the clamp sets the sync tip close to the ground level. 6dB Pb/B_IN TRANSPARENT CLAMP 6dB Pb/B_OUT 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz) BIAS BIAS NETWORK Input Coupling The choice of AC- or DC-coupling the input depends on the video source. Many DACs have a current output and are terminated to ground with a resistor; such signals are conveniently DC-coupled. Use AC-coupling when the DC level of the video signal is unknown or outside the specified input range of the MAX11508/ MAX11509, such as SCART or VCC-terminated DAC outputs. A bias network within 2 channels of the MAX11508/MAX11509, for use with bipolar signals, Pr/R_IN TRANSPARENT CLAMP SHDN 6dB 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz) FSEL1 FSEL0 GND Figure 1. Block Diagram Table 1. Frequency-Selection Truth Table CONTROL INPUTS FSEL1 FSEL0 0 0 0 1 1 0 1 1 8 FILTER -3dB FREQUENCY (MHz) MAX11508 MAX11509 9 10 16 17 33 34 60 60 OPERATING MODE Standard definition Progressive scan High definition Bypass _______________________________________________________________________________________ Pr/R_OUT Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509 2.55V OUTPUT SIGNAL MAX11508 MAX11509 INPUT 1.0V OUTPUT 1.15V INPUT SIGNAL 0.3V 0.55V 0.0V SD SYNC SIGNAL NOT SHOWN FOR CLARITY. Figure 2. Typical AC-Coupled Signal 2.59V OUTPUT SIGNAL MAX11508 MAX11509 1.02V INPUT OUTPUT 1.19V INPUT SIGNAL 0.32V 0.59V 0.02V 0.00V SD SYNC SIGNAL NOT SHOWN FOR CLARITY. Figure 3. Typical DC-Coupled Signal _______________________________________________________________________________________ 9 MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508 MAX11509 ENCODER Pb/B_IN DAC 0.1µF VCC VCC 0.59V BIAS 0.59V Pr/R_IN DAC 0.1µF Figure 4. Simple AC-Coupling and BIAS Control for Unipolar Signals (CVBS, Y, R, G, B) MAX11508 MAX11509 ENCODER Pb/B_IN DAC 0.1µF VCC BIAS 0.59V 0.59V Pr/R_IN DAC 0.1µF Figure 5. AC-Coupling and BIAS Control for Bipolar Signals (C, Pb, Pr) 10 ______________________________________________________________________________________ Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer The MAX11508 filter characteristic provides excellent time-domain response with low overshoot and guarantees minimal attenuation in the passband. The MAX11509 filters offer a small gain peaking response to counter system rolloff. Select filter frequency with inputs FSEL0 and FSEL1, as shown in Table 1. Standard-Definition (SD) Filters The MAX11508 SD filters have a 9MHz (typ) -3dB frequency, while the MAX11509 SD filters offer a 10MHz (typ) -3dB frequency and a +0.8dB high-frequency boost at 5MHz (typ). Both devices have a stopband attenuation of +48dB (typ) at 27MHz. Progressive-Scan (PS) Filters The MAX11508 PS filters have a 16MHz (typ) -3dB frequency, while the MAX11509 PS filters offer a 17MHz (typ) -3dB frequency and a +0.8dB high-frequency boost at 8.5MHz (typ). Both devices have a stopband attenuation of +44dB (typ) at 54MHz. High-Definition (HD) Filters The MAX11508 HD filters have a 33MHz (typ) -3dB frequency, while the MAX11509 HD filters offer a 34MHz (typ) -3dB frequency and a +0.8dB high-frequency boost at 20MHz (typ). Both devices have a stopband attenuation of +45dB (typ) at 74.25MHz. Bypassing the Filters The MAX11508/MAX11509 filter bypass circuitry offers a 60MHz (typ) -3dB frequency. Bypassed filters offer no gain peaking. Output Buffer The MAX11508/MAX11509 feature output buffers with +6dB gain that drive a standard 150Ω video load at 2V P-P. A typical load consists of a 75Ω backmatch resistor, an optional 220µF or larger coupling capacitor, and a 75Ω termination resistor. An offset of 550mV is added at the output. The offset ensures that the blanking level on the output is less than 1V after the backmatch resistor, thus meeting digital TV specifications allowing the devices to drive video loads directly without using costly AC-coupling capacitors. The basic output voltage equation of all filters is: VOUT = (2 x VIN) + 0.55V Shutdown Forcing digital input SHDN low places the MAX11508/ MAX11509 into low-power shutdown mode. In shutdown, the device consumes only 1µA (typ), and the outputs are internally connected to GND through 1.58kΩ resistors. In shutdown, the input clamps are disabled and the inputs are internally connected to GND through 350kΩ resistors. When shutdown is forced low while BIAS is low, the bias network remains active, but the bias voltage changes from its nominal 0.59V to 0.475V (typ). Applications Information Output Considerations DC- or AC-couple the MAX11508/MAX11509 outputs. These devices, with +6dB gain, are typically connected to a 75Ω series backmatch resistor followed by a video cable. Choose an AC-coupling capacitor value that ensures that the lowest frequency content in the video signal is passed and the field-time distortion is kept within desired limits when using an AC connection. The selection of this value is a function of the input impedance, and more importantly, the input leakage of the circuit being driven. Common industry practice is to use a 220µF or larger capacitor. The MAX11508/MAX11509 outputs are fully protected against short circuits to ground. The short-circuit protection circuitry limits the output current to 75mA (typ) per output. Shorting more than one output to ground simultaneously may exceed the maximum package power dissipation. PCB Layout Recommendations Connect the power and ground traces to large copper areas to enhance power dissipation. Bypass VCC to GND with 0.1µF and 1.0µF capacitors. Place the 0.1µF capacitor closest to VCC. Use surface-mount capacitors for their low inductance. Place traces carrying video signals appropriately to avoid mutual coupling. When inputs are AC-coupled, place the capacitors as close as possible to the device and keep traces short to minimize parasitic capacitance and inductance. Refer to the MAX11508/MAX11509 evaluation kit data sheet for PCB layout. Chip Information PROCESS: BiCMOS Typical voltage waveforms are shown in Figures 2 and 3. ______________________________________________________________________________________ 11 MAX11508/MAX11509 Filters MAX11508/MAX11509 Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer Typical Operating Circuit +5V 1.0µF 0.1µF VCC Y/G_IN DAC AC-COUPLING CAPACITORS ARE OPTIONAL. 75Ω VIDEO 220µF 75Ω CABLE Y/G_OUT 75Ω 75Ω MAX11508 MAX11509 Pb/B_OUT Pb/B_IN DAC 75Ω 75Ω 220µF 75Ω BIAS SHDN Pr/R_OUT Pr/R_IN DAC 75Ω 75Ω 220µF 75Ω FSEL1 FSEL0 GND Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 14 TSSOP U14+1 21-0066 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.