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19-4346; Rev 0; 10/08
KIT ATION EVALU ILABLE AVA
Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer
General Description Features
Three Selectable 6th-Order 9MHz/16MHz/33MHz (SD/PS/HD) Filters Bypass Mode for High Bandwidth Signals Transparent Input Clamp Output Buffers Drive a Standard 150 Video Load 12kV HBM ESD Protection on Outputs 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
MAX11508/MAX11509
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. 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 150 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 1A (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 (0C to +85C) temperature range. The parts are offered in the 14-pin TSSOP package.
Ordering Information
PART MAX11508UUD+ MAX11509UUD+ TEMP RANGE 0C to +85C 0C to +85C PIN-PACKAGE 14 TSSOP 14 TSSOP
+Denotes a lead-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
VCC 1 FSEL0 2 Y/G_IN 3 Pb/B_IN 4 Pr/R_IN 5 BIAS 6 N.C. 7
Applications
Cable and Satellite STB Receivers HDTV DVD Players Personal Video Recorders DVRs Video-On-Demand HD Recorders
+
14 N.C. 13 FSEL1
MAX11508 MAX11509
12 Y/G_OUT 11 Pb/B_OUT 10 Pr/R_OUT 9 SHDN 8 GND
TSSOP
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ 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.
Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
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) 14-Pin TSSOP (derate 10mW/C above +70C) .......796.8mW Maximum Current into Any Pin Except VCC and GND .....50mA Operating Temperature Range.... ..........................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, all frequency responses are relative to 100kHz, unless otherwise noted.) (Note 1)
PARAMETER DC CHARACTERISTICS Supply Current Supply Voltage Range Input Voltage Range Power-Down Current Digital Input High Voltage Digital Input Low Voltage STANDARD-DEFINITION VIDEO -1dB Bandwidth -3dB Bandwidth Stopband Attenuation Low-Frequency Gain Differential Gain Differential Phase Total Harmonic Distortion Signal-to-Noise Ratio Group Delay Power-Supply Rejection Ratio f1dB f3dB ASB AV dG d THD SNR tG PSRR MAX11508, TA = +25C MAX11509, TA = +25C MAX11508 MAX11509 f = 27MHz No load All channels All channels VOUT = 1.4VP-P, f = 1MHz, all channels 2VP-P signal to RMS noise, f = 100kHz to 4.2MHz f = 4.5MHz DC, all channels 35 5.6 4.5 5 7.9 8.6 9.0 10 48 6.0 0.7 0.7 -60 71 59 50 6.6 MHz MHz dB dB % Degrees dB dB ns dB ICC VDD VIN IPD VIH VIL Referenced to GND if DC-coupled BIAS = high BIAS = low 2.0 0.8 No load 4.75 24 5.00 1.4 1 15 35 5.25 mA V V A V V SYMBOL CONDITIONS MIN TYP MAX UNITS
2
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, RLOAD = 150 to GND, CIN = 0.1F, TA = 0C to +85C, all frequency responses are relative to 100kHz, unless otherwise noted.) (Note 1)
PARAMETER PROGRESSIVE-SCAN VIDEO -1dB Bandwidth -3dB Bandwidth Stopband Attenuation Low-Frequency Gain Total Harmonic Distortion Signal-to-Noise Ratio Group Delay HIGH-DEFINITION VIDEO -1dB Bandwidth -3dB Bandwidth f1dB f3dB MAX11508, TA = +25C MAX11509, TA = +25C MAX11508 MAX11509 f = 37.125MHz Stopband Attenuation Low-Frequency Gain Total Harmonic Distortion ASB AV VOUT = 1.4VP-P, f = 10MHz THD VOUT = 1.4VP-P, f = 15MHz VOUT = 1.4VP-P, f = 22MHz Signal-to-Noise Ratio Group Delay BYPASS VIDEO (Note 2) -3dB Bandwidth Low-Frequency Gain Total Harmonic Distortion Signal-to-Noise Ratio f3dB AV THD SNR VOUT = 1.4VP-P, f = 22MHz 2VP-P signal to RMS noise, f = 100kHz to 30MHz 5.4 60 6.0 -40 65 6.6 MHz dB dB dB SNR tG 2VP-P signal to RMS noise, f = 100kHz to 30MHz f = 20MHz f = 44.25MHz f = 74.25MHz 5.4 21 22 30 31 33 34 6.5 14.5 45 6.0 -55 -50 -40 65 25 dB ns dB 6.6 dB dB MHz MHz f1dB f3dB ASB AV THD SNR tG VOUT = 1.4VP-P, f = 7MHz 2VP-P signal to RMS noise, f = 100kHz to 15MHz f = 10MHz MAX11508, TA = +25C MAX11509, TA = +25C MAX11508 MAX11509 f = 54MHz 5.6 9 10 13.5 14 16 17 44 6.0 -55 66 47 6.6 MHz MHz dB dB dB dB ns SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX11508/MAX11509
Note 1: All devices are 100% production tested at TA = +25C. Note 2: Output AC-coupled with 220F into 150 to GND.
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
Typical Operating Characteristics
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C, unless otherwise noted.)
MAX11508 SD FREQUENCY RESPONSE
MAX11508 toc01
MAX11508 SD PASSBAND RESPONSE
MAX11508 toc02
MAX11509 SD FREQUENCY RESPONSE
MAX11508 toc03
10 0 -10 RESPONSE (dB)
7
10 0 -10
5 RESPONSE (dB)
-20 -30 -40
3
RESPONSE (dB)
-20 -30 -40
1
-1 -50 -60 0.1 1 10 100 FREQUENCY (MHz) -3 0.1 1 FREQUENCY (MHz) 10 -50 -60 0.1 1 10 100 FREQUENCY (MHz)
MAX11509 SD PASSBAND RESPONSE
MAX11508 toc04
MAX11508 PS FREQUENCY RESPONSE
MAX11508 toc05
MAX11508 PS PASSBAND RESPONSE
MAX11508 toc06
7
10 0 -10
7
5 RESPONSE (dB)
5 RESPONSE (dB)
RESPONSE (dB)
3
-20 -30 -40
3
1
1
-1 -50 -3 0.1 1 FREQUENCY (MHz) 10 -60 0.1 1 10 100 FREQUENCY (MHz)
-1
-3 0.1 1 10 100 FREQUENCY (MHz)
MAX11509 PS FREQUENCY RESPONSE
MAX11508 toc07
MAX11509 PS PASSBAND RESPONSE
MAX11508 toc08
MAX11508 HD FREQUENCY RESPONSE
MAX11508 toc09
10 0 -10 RESPONSE (dB)
7
10 0 -10
5 RESPONSE (dB)
-20 -30 -40
3
RESPONSE (dB)
-20 -30 -40
1
-1 -50 -60 0.1 1 10 100 FREQUENCY (MHz) -3 0.1 1 10 100 FREQUENCY (MHz) -50 -60 0.1 1 10 100 FREQUENCY (MHz)
4
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer
Typical Operating Characteristics (continued)
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C, unless otherwise noted.)
MAX11508 HD PASSBAND RESPONSE
MAX11508 toc10
MAX11508/MAX11509
MAX11509 HD FREQUENCY RESPONSE
MAX11508 toc11
MAX11509 HD PASSBAND RESPONSE
MAX11508 toc12
7
10 0 -10
7
5 RESPONSE (dB)
5 RESPONSE (dB)
RESPONSE (dB)
3
-20 -30 -40
3
1
1
-1 -50 -3 0.1 1 10 100 FREQUENCY (MHz) -60 0.1 1 10 100 FREQUENCY (MHz)
-1
-3 0.1 1 10 100 FREQUENCY (MHz)
MAX11508 BP FREQUENCY RESPONSE
MAX11508 toc13
MAX11508 BP PASSBAND RESPONSE
MAX11508 toc14
MAX11509 BP FREQUENCY RESPONSE
MAX11508 toc15
10 0 -10 RESPONSE (dB)
7
10 0 -10
5 RESPONSE (dB)
-20 -30 -40
3
RESPONSE (dB)
-20 -30 -40
1
-1 -50 -60 0.1 1 10 100 FREQUENCY (MHz) -3 0.1 1 10 100 FREQUENCY (MHz) -50 -60 0.1 1 10 100 FREQUENCY (MHz)
MAX11509 BP PASSBAND RESPONSE
MAX11508 toc16
MAX11508 SD GROUP DELAY vs. FREQUENCY
MAX11508 toc17
MAX11509 SD GROUP DELAY vs. FREQUENCY
MAX11508 toc18
7
120 100 80
120 100 80 DELAY (ns) 60 40 20 0 -20
5 RESPONSE (dB)
3
DELAY (ns)
60 40 20
1
-1 0 -3 0.1 1 10 100 FREQUENCY (MHz) -20 0.1 1 10 100 FREQUENCY (MHz)
0.1
1
10
100
FREQUENCY (MHz)
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
Typical Operating Characteristics (continued)
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C, unless otherwise noted.)
MAX11508 PS GROUP DELAY vs. FREQUENCY
MAX11508 toc19
MAX11509 PS GROUP DELAY vs. FREQUENCY
MAX11508 toc20
MAX11508 HD GROUP DELAY vs. FREQUENCY
MAX11508 toc21
80
80
40
60
60
20 DELAY (ns)
DELAY (ns)
40
DELAY (ns)
40
0
20
20
0
0
-20
-20 0.1 1 10 100 FREQUENCY (MHz)
-20 0.1 1 10 100 FREQUENCY (MHz)
-40 0.1 1 10 100 FREQUENCY (MHz)
MAX11509 HD GROUP DELAY vs. FREQUENCY
MAX11508 toc22
MAX11508 BP GROUP DELAY vs. FREQUENCY
MAX11508 toc23
MAX11509 BP GROUP DELAY vs. FREQUENCY
MAX11508 toc24
40
40
40
20 DELAY (ns) DELAY (ns)
20 DELAY (ns)
20
0
0
0
-20
-20
-20
-40 0.1 1 10 100 FREQUENCY (MHz)
-40 0.1 1 10 100 FREQUENCY (MHz)
-40 0.1 1 10 100 FREQUENCY (MHz)
MAX11508 SD DIFFERENTIAL GAIN, NTSC
MAX11508 toc25
MAX11508 SD DIFFERENTIAL PHASE, NTSC
MAX11508 toc26
MAX11509 SD DIFFERENTIAL GAIN, NTSC
0.8 0.6 DIFFERENTIAL GAIN (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAX11508 toc27
1.0 0.8 0.6 DIFFERENTIAL GAIN (%) 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 1 2 3 4 STEP 5 6 7
1.0 0.8 DIFFERENTIAL PHASE (deg) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 1 2 3 4 STEP 5 6 7
1.0
1
2
3
4 STEP
5
6
7
6
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer
Typical Operating Characteristics (continued)
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C, unless otherwise noted.)
MAX11509 SD DIFFERENTIAL PHASE, NTSC
0.8 DIFFERENTIAL PHASE (deg) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 1 2 3 4 STEP 5 6 7 CH2 CH1: INPUT, 200mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 200mV/div 200ns/div CH2 200ns/div CH1: INPUT, 200mV/div CH2: OUTPUT AFTER BACKMATCH RESISTOR, 200mV/div OUT OUT CH1 CH1
MAX11508 toc28
MAX11508/MAX11509
MAX11508 SD 2T RESPONSE
MAX11508 toc29
MAX11509 SD 2T RESPONSE
MAX11508 toc30
1.0
IN
IN
Pin Description
PIN 1 2 3 4 5 6 7, 14 8 9 10 11 12 13 NAME VCC FSEL0 Y/G_IN Pb/B_IN Pr/R_IN BIAS N.C. GND SHDN Pr/R_OUT Pb/B_OUT Y/G_OUT FSEL1 Power-Supply Input Frequency-Select Input. LSB for bandwidth selection. Video Input Channel 1 Video Input Channel 2 Video Input Channel 3 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. No Connection. Not internally connected. Ground Shutdown Digital Input. SHDN places the device into a powered-down state. Force SHDN low to enable shutdown. Force SHDN high for normal operation. Video Output Channel 3 Video Output Channel 2 Video Output Channel 1 Frequency Select Input. MSB for bandwidth selection. FUNCTION
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
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 1A (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 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz) 6dB Y/G_OUT
Inputs
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.
Pb/B_IN
MAX11508 MAX11509
TRANSPARENT CLAMP 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz)
6dB
Pb/B_OUT
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 9MHz/16MHz/33MHz/60MHz (10MHz/17MHz/34MHz/60MHz) 6dB Pr/R_OUT
SHDN 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 FILTER -3dB FREQUENCY (MHz) MAX11508 MAX11509 9 10 16 17 33 34 60 60 OPERATING MODE Standard definition Progressive scan High definition Bypass
8
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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
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Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
ENCODER DAC 0.1F Pb/B_IN
MAX11508 MAX11509
VCC VCC BIAS 0.59V 0.59V
DAC 0.1F
Pr/R_IN
Figure 4. Simple AC-Coupling and BIAS Control for Unipolar Signals (CVBS, Y, R, G, B)
ENCODER DAC 0.1F Pb/B_IN
MAX11508 MAX11509
VCC
BIAS
0.59V 0.59V
DAC 0.1F
Pr/R_IN
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
Filters
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.
Shutdown
Forcing digital input SHDN low places the MAX11508/ MAX11509 into low-power shutdown mode. In shutdown, the device consumes only 1A (typ), and the outputs are internally connected to GND through 1.58k resistors. In shutdown, the input clamps are disabled and the inputs are internally connected to GND through 350k 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).
MAX11508/MAX11509
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.
Applications Information
Output Considerations
DC- or AC-couple the MAX11508/MAX11509 outputs. These devices, with +6dB gain, are typically connected to a 75 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 220F 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.
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.
PCB Layout Recommendations
Connect the power and ground traces to large copper areas to enhance power dissipation. Bypass VCC to GND with 0.1F and 1.0F capacitors. Place the 0.1F 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.
Output Buffer
The MAX11508/MAX11509 feature output buffers with +6dB gain that drive a standard 150 video load at 2V P-P. A typical load consists of a 75 backmatch resistor, an optional 220F or larger coupling capacitor, and a 75 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 Typical voltage waveforms are shown in Figures 2 and 3.
Chip Information
PROCESS: BiCMOS
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11
Low-Cost, 3-Channel, HD/PS/SD/BP Video Filters with Buffer MAX11508/MAX11509
Typical Operating Circuit
+5V
1.0F VCC
0.1F AC-COUPLING CAPACITORS ARE OPTIONAL. 75 VIDEO 220F 75 CABLE Y/G_OUT
DAC 75
Y/G_IN
MAX11508 MAX11509
DAC 75 Pb/B_IN Pb/B_OUT 75 220F
75
BIAS
75
SHDN 75 220F
DAC 75
Pr/R_IN
Pr/R_OUT
FSEL1
75
FSEL0
GND
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 14 TSSOP PACKAGE CODE U14+1 DOCUMENT NO. 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 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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