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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 150 (75 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 0C to +85C 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 0C to +85C 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 = +70C) 8-Pin SO (derate 5.9mW/C above +70C)................. 470mW Maximum Current into any Pin Except VCC and GND......50mA Operating Temperature Range MAX1150_USA+ .................................................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, 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 d 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
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Three-Channel, Standard-Definition Video Filters
Typical Operating Characteristics
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C.)
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 10s/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR -70 0.1 1 10 100 FREQUENCY (MHz)
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Three-Channel, Standard-Definition Video Filters MAX11501/MAX11502
Typical Operating Characteristics (continued)
(VCC = 5V, RL = 150 to GND, output DC-coupled, TA = +25C.)
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 10s/div CH1 = INPUT CH2 = OUTPUT, AFTER BACKMATCH RESISTOR
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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 Typical 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
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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 0.1F 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 x VCC - (IL x R1) , R1 + R2
VCC ENCODER 0.1F DAC R2 120k R1 820k IN_
MAX11501 MAX11502
(
)
Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr)
where IL is the input leakage current (typically 0.5A).
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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 75 backmatch resistor, an optional 220F or larger AC-coupling capacitor, a transmission line, and a 75 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 ) x 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 220F, 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.
75
220F (OPTIONAL)
MAX11501 MAX11502
OUT_
75
220F (OPTIONAL)
MAX11501 MAX11502
75 OUT_ 75 75 220F (OPTIONAL)
75
(a)
(b)
Figure 5. Typical Output Loads
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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 + (RJA x PD) where TJ is junction temperature, TA is ambient temperature (assume +70C), and RJA is thermal resistance junction to ambient. From the Absolute Maximum Ratings section of the data sheet, the derating factor is 5.9mW/C above +70C. RJA = 1/(derating factor) = 1/(5.9mW/C) = 170C/W (derating and maximum power dissipation are based on minimum PCB copper and indicate worst case). Therefore: TJ = 70 + (170 x 0.364) = +132C 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 = +112C
(5 -
1.88) x 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 0.1F and 1.0F 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.
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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 0.1F* DAC 75 IN1 TRANSPARENT CLAMP
MAX11501 MAX11502
+6dB 9MHz 5TH-ORDER BUTTERWORTH FILTER BUFFER OUT1 75 220F*
75
0.1F* DAC 75 IN2 +6dB
OUT2
75
220F*
75
0.1F* DAC 75 GND IN3 +6dB
OUT3
75
220F*
75
*OPTIONAL CAPACITORS
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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
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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
(c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
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