19-3212; Rev 0; 1/08 KIT ATION EVALU E L B A AVAIL Three-Channel, High-Definition Video Filter Features The MAX11500 integrated three-channel high-definition (HD) video filter includes input video clamps and output buffers. This device is ideal for anti-aliasing and DAC smoothing video applications such as set-top boxes, hard-disk recorders (HDRs), DVD players, and personal video recorders. The 6th-order channel filters have a typical -3dB bandwidth of 33MHz. Each channel has an output buffer with a gain of +6dB and can drive a full 2VP-P video signal into one standard 150 video load. These buffers can drive either an AC- or DC-coupled load such that the blanking level voltage after the backmatch resistor is less than 1V. Three-Channel 6th-Order Filter for High-Definition Video The video inputs feature a transparent clamp for ACand DC-coupled input signals. If the input signal does not go below ground, the input clamp is inactive, thus enabling DAC outputs to be DC-coupled to the input. The device operates from a single +5V supply, is offered in the upper commercial 0C to +85C temperature range, and is available in a small 8-pin SO package. +6dB Output Buffers Transparent Input Clamps AC- or DC-Coupled Inputs AC- or DC-Coupled Outputs Output Buffers Drive One Standard 150 Video Load 12kV HBM ESD Protection on Outputs Single +5V Power Supply Small 8-Pin SO package Ordering Information Applications High-Definition Set-Top Box Receivers HD Television Sets HD Recorders PART TEMP RANGE MAX11500USA+ 0C to +85C PINPACKAGE 8 SO PKG CODE S8-2 +Denotes a lead-free package. DVD Players Personal Video Recorders Video-On-Demand Pin Configuration Typical Operating Circuit VCC TOP VIEW MAX11500 IN1 TRANSPARENT CLAMP IN2 TRANSPARENT CLAMP IN3 TRANSPARENT CLAMP 33MHz 33MHz 33MHz +6dB OUT1 +6dB OUT2 +6dB OUT3 IN1 1 IN2 2 + 8 OUT1 7 OUT2 3 6 OUT3 VCC 4 5 GND MAX11500 IN3 SO GND ________________________________________________________________ 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 MAX11500 General Description MAX11500 Three-Channel, High-Definition Video Filter 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 = +70C) 8-Pin SO (derate 5.9mW/C above +70C)...............470.6mW Maximum Current into any Pin Except VCC and GND......50mA Operating Temperature Range MAX11500USA ...................................................0C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Junction Temperature ......................................................+150C 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 = 150 to GND, CIN = 0.1F, TA = 0C to +85C, unless otherwise specified. All frequency response is relative to 100kHz.) PARAMETER SYMBOL -1dB Bandwidth f1dB -3dB Bandwidth f3dB Stopband Attenuation ASB CONDITIONS TA = +25C AV Low-Frequency Gain Matching AV(MATCH) Input Voltage Range VIN Total Harmonic Distortion THD Channel-to-Channel Crosstalk XTALK Signal-to-Noise Ratio SNR Group Delay tg Group-Delay Deviation tg Supply Voltage Range VCC Supply Current ICC TYP 23 30 MHz 33 MHz f = 37.125MHz 6.5 f = 44.25MHz 15.5 f = 74.25MHz, TA = +25C Low-Frequency Gain MIN 32 48 5.4 6.0 UNITS dB 6.6 dB 0.01 dB Referenced to GND if DC-coupled 1.7 V VOUT = 1.4VP-P, f = 10MHz 0.15 VOUT = 1.4VP-P, f = 15MHz 0.2 VOUT = 1.4VP-P, f = 22MHz 0.8 f = 1MHz -72 dB Peak signal (2VP-P) to RMS noise, f = 100kHz to 30MHz 68 dB f = 100kHz 25 ns f = 100kHz to 26MHz No load % 8 4.75 ns 5 5.25 V 24 38 mA Note 1: All devices are 100% production tested at TA = +25C. 2 MAX _______________________________________________________________________________________ Three-Channel, High-Definition Video Filter (VCC = +5V, outputs AC-coupled with 220F, RLOAD = 150 to GND, CIN = 0.1F, TA = +25C. All frequency response is relative to 100kHz.) MAGNITUDE RESPONSE (PASSBAND) 0 GROUP DELAY 60 MAX11500 toc02 8.0 MAX11500 toc01 20 7.5 MAX11500 toc03 MAGNITUDE RESPONSE (PASSBAND AND STOPBAND) 50 -20 -40 40 6.5 DELAY (ns) RESPONSE (dB) RESPONSE (dB) 7.0 6.0 5.5 MAX11500 Typical Operating Characteristics 30 20 5.0 -60 10 4.5 -80 0 4.0 0.1 1 10 100 0.1 1 10 0.1 100 1 10 100 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) 2T RESPONSE HD MULTIBURST RESPONSE (1MHz-10MHz) HD MULTIBURST RESPONSE (20MHz-30MHz) MAX11500 toc04 40ns/div MAX11500 toc06 MAX11500 toc05 200mV/div 200mV/div 200mV/div 200mV/div 200mV/div 200mV/div 4s/div 4s/div _______________________________________________________________________________________ 3 Three-Channel, High-Definition Video Filter MAX11500 Pin Description Typical voltage waveforms are shown in Figures 1 and 2. Transparent Clamps PIN NAME FUNCTION 1 IN1 Video Input Channel 1 2 IN2 Video Input Channel 2 3 IN3 Video Input Channel 3 4 VCC Power Supply. Bypass to GND with 0.1F and 1F capacitors. 5 GND Ground All inputs feature a transparent clamp that allows either AC- or DC-coupling of the inputs. The clamp remains inactive while the input signal is above ground, offering true DC input coupling. If the signal goes below ground, as is the case if it is AC-coupled, the clamp sets the sync tip close to the ground level. Input Coupling 6 OUT3 Video Output Channel 3 7 OUT2 Video Output Channel 2 8 OUT1 Video Output Channel 1 Detailed Description The MAX11500 integrates three high-definition (HD) video filters, each with a transparent input clamp, a 6thorder lowpass filter with a -3dB bandwidth of 33MHz, and an output stage with a gain of 2V/V. The output signal is offset by typically 550mV to optimize driver performance. VOUT = 2 x VIN + 0.55V The choice to AC- or DC-couple the input depends on the video source. Many DACs have a current output and are terminated to ground with a resistor; such signals can be conveniently DC-coupled. In cases where the DC level of the video signal is unknown or outside of the specified input range of the MAX11500, such signals require AC-coupling. Examples of the latter are SCART inputs and DACs terminated to VCC. DC-Coupled Inputs If the input is DC-coupled, the voltage must remain above zero but not exceed the maximum input voltage of 1.7V (typical). 2.55V OUTPUT SIGNAL MAX11500 IN_ OUT_ 1.0V 1.15V INPUT SIGNAL 0.3V 0.55V 0.0V Figure 1. Typical AC-Coupled Signal 4 _______________________________________________________________________________________ Three-Channel, High-Definition Video Filter MAX11500 2.59V OUTPUT SIGNAL MAX11500 1.02V IN_ OUT_ 1.19V INPUT SIGNAL 0.32V 0.59V 0.02V 0.00V Figure 2. Typical DC-Coupled Signal AC-Coupled Inputs If the input is AC-coupled, the transparent clamp will be active and sets the sync tip or the lowest voltage of the signal close to ground. This clamping behavior is appropriate for unipolar signals such as Y, R, G, or B with or without sync pulse (Figure 3). For bipolar signals such as Pb, Pr signals, the AC-coupled inputs should be biased to a fixed DC voltage to ensure that the transparent clamp never turns on. A suitable network that biases the input to typically 0.59V is shown in Figure 4. The device has an input leakage current (I L ) of typically 0.5A and thus the bias voltage is derived as follows: VB = MAX11500 ENCODER 0.1F IN_ DAC Figure 3. AC-Coupling for Unipolar Signals (Y, R, G, B) R2 (VCC - IL x R1) R1 + R2 HD Filters The internal filters are optimized to deliver a flat passband along with high stopband attenuation. The filter characteristic has been chosen to provide an excellent time-domain response with low overshoot. The typical -3dB frequency of 33MHz guarantees low attenuation in the passband, while at the same time allowing for a typical attenuation of -48dB at 74.25MHz. VCC ENCODER 0.1F R1 820k MAX11500 IN_ DAC R2 120k Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr) _______________________________________________________________________________________ 5 MAX11500 Three-Channel, High-Definition Video Filter Output Buffer The MAX11500 features output buffers with +6dB gain that drive a standard 150 video load. A typical load consists of a 75 backmatch resistor, an optional 220F or larger coupling capacitor, and a 75 termination resistor. The offset between input and output signals has been chosen such that the blanking level on the output is less than 1V after the backmatch resistor, thus meeting digital TV specifications. This allows the MAX11500 to drive video loads directly without using costly AC-coupling capacitors. Applications Information Output Considerations The MAX11500 outputs can be DC- or AC-coupled. The MAX11500, with +6dB gain, is typically connected to a 75 series backmatch resistor followed by the video cable. If an AC connection is used, 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. 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 220F or larger capacitor. 6 The outputs of the MAX11500 are fully protected against a short circuit either to the ground or the positive supply of the device. The short-circuit protection circuitry limits the output current to typically 75mA per output. Shorting more than one output simultaneously may exceed the maximum package power dissipation. PCB Layout Recommendations The device is thermally designed to operate with minimum copper. However, to help with heat dissipation, connect the power and ground traces to large copper areas if possible. Bypass VCC to GND with a 0.1F capacitor and an additional 1F capacitor in parallel for additional low-frequency decoupling. Using surfacemount capacitors reduces lead inductance and ensures that the impedance of the capacitors is low over a broad range of frequencies. Place traces carrying video signals appropriately to avoid mutual coupling. If AC-coupling the inputs, place the input coupling capacitors as close as possible to the device and keep traces short to minimize parasitic capacitance and inductance. Doing so extends the performance to the uppermost frequency range possible with the MAX11500. For a recommended PCB layout, refer to the MAX11500 EV kit data sheet. _______________________________________________________________________________________ Three-Channel, High-Definition Video Filter +5V 0.1F 1F VCC 4 MAX11500 ENCODER 0.1F* DAC IN1 1 CLAMP 33MHz +6dB 8 OUT1 75 220F* 75 75 0.1F* DAC IN2 2 CLAMP 33MHz +6dB 7 OUT2 75 220F* 75 75 0.1F* DAC 75 IN3 3 CLAMP 33MHz +6dB 6 OUT3 75 220F* 75 5 GND *OPTIONAL _______________________________________________________________________________________ 7 MAX11500 Typical Operating Circuit Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.053 0.069 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.050 0.016 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS MAX11500 Three-Channel, High-Definition Video Filter 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D A B e A1 FRONT VIEW C 0\-8\ L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 REV. B 1 1 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.