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MAX7454UUP
6 dB, HD/SD switchable video filter and buffer
General DescriptionThe MAX7454/MAX7455 triple-channel video recon-
struction filters and buffers are ideal for high definition
(HD), standard definition progressive scan/noninter-
laced (SDp), and standard definition interlaced (SDi)
television applications. These devices are a fully inte-
grated solution for filtering and buffering HD and/or
SDp/SDi TV signals in component video output format
(Y PBPRor RGB). The MAX7454/MAX7455 are compati-
ble with the 1080i, 720p, 480p, and 480i scanning system
standards. In addition to having an HD/SD switchable
frequency response, the magnitude response can be
optimized by approximately 15% by a control input.
The input and output signals are DC-coupled to the
MAX7454/MAX7455, eliminating the large output AC-cou-
pling capacitors normally used. The MAX7454/MAX7455
output buffers drive a 2VP-Pvideo signal into a standard
150Ωload. The MAX7454 has a gain of +6dB and the
MAX7455 has a gain of +12dB. Both devices are available
in a 20-pin TSSOP package and are fully specified over
the upper commercial (0°C to +85°C) temperature range.
ApplicationsSet-Top Boxes
Direct-Broadcast Satellite (DBS) Receiver
DVD Players
Hard-Disk Recorders
HDTV (LCD, PDP, DLP)
Professional Cameras
Features30MHz High Definition (HD)/10MHz Standard
Definition (SD) Switchable Video Reconstruction
Filter15% Magnitude Response AdjustmentPassband: -2.3dB at 30MHz
-0.40dB at 10MHz
-0.10dB at 5MHzStopband: -55dB at 74MHz (HDTV)
-62dB at 27MHz (SDTV)Output Blank Level <1V for DC-Coupled Output+6dB Gain (MAX7454) or +12dB Gain (MAX7455)Direct Coupled Input, Zero Tilt Direct Coupled Output, No Large Output CapacitorDrives 2VP-P Signal in 150ΩVideo LoadSmall 20-Pin TSSOP PackageSingle +5V Supply
MAX7454/MAX7455
HD/SD Switchable Video Filters and Buffers
Ordering Information
Typical Operating Circuit+Indicates lead-free packaging.
*Future product—contact factory for availability.
**EP = Exposed pad.
Pin Configuration appears at end of data sheet.
MAX7454/MAX7455
HD/SD Switchable Video Filters and Buffers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +5V ±5%, RLOAD= 150Ωto GND, CLOAD= 0 to 20pF to GND, SD/HD= GND, FSEL = VCC, TA= TMINto TMAX,unless other-
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.
VCCto GND..............................................................-0.3V to +6V
IN1, IN2, IN3 to GND..................................-0.3V to (VCC+ 0.3V)
OUT1, OUT2, OUT3 to GND......................-0.3V to (VCC+ 0.3V)
SD/HD, FSEL to GND.................................-0.3V to (VCC+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
20-Pin TSSOP (derate 21.7mW/°C above +70°C).....1739.1mW
Maximum Current into IN1, IN2, IN3, SD/HD, FSEL.........±50mA
Operating Temperature Range
MAX745_UUP.....................................................0°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Junction Temperature......................................................+150°C
MAX7454/MAX7455
HD/SD Switchable Video Filters and Buffers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V ±5%, RLOAD= 150Ωto GND, CLOAD= 0 to 20pF to GND, SD/HD= GND, FSEL = VCC, TA= TMINto TMAX,unless other-
wise noted. Typical values are at VCC= +5V and TA = +25°C.)
Note 2:This applies for an anti-aliasing filtering application using a 0.1µF input capacitor. This does not apply for a video recon-
struction application, since there is no input-coupling capacitor.
Typical Operating Characteristics(RLOAD= 150Ωto GND, VCC= +5V, and TA = +25°C.)
MAX7454/MAX7455
HD/SD Switchable Video Filters and Buffers
Typical Operating Characteristics (continued)(RLOAD= 150Ωto GND, VCC= +5V, and TA = +25°C.)
Detailed DescriptionThe MAX7454/MAX7455 are ideal for use in consumer
electronic products such as HD-compatible cable-TV
set-top boxes or DBS receiver decoders, which process
video signals in component output format. The
MAX7454/MAX7455 support both the 1080i and the
720p scanning formats for HDTV as well as the 480i and
480p formats for SDi and SDp TV. The reconstruction fil-
ters take three signals out of a video digital-to-analog
converter (DAC) or an encoder and smooth the signals
with appropriate filtering. FSEL and SD/HDselect the fil-
ter frequency response for SDp, SDi, and HDTV (see
Table 1). The outputs are connected directly to standard
150Ωvideo loads.
The Typical Operating Circuitillustrates the internal
structure of the MAX7454/MAX7455. The lowpass filter
attenuates the high-frequency contents of the input,
and the output amplifier drives a standard video load.
Filter
Filter responseThe video filter features an elliptic-type response with a
steep transition band response to achieve a wider
passband response along with an excellent stopband
response. In addition, the filter has been optimized to
give a good time domain response with low overshoot.
The stopband offers 62dB (typ) of attenuation at
sampling frequencies of 27MHz and above for
SDTV and 55dB (typ) of stopband attenuation for
frequencies of 74MHz and above for HDTV (see the
Typical Operating Characteristics).
Frequency AdjustingSD/HDselects the HD or SD mode. In HD or SD mode,
FSEL allows optimization of the passband or stopband
performance by adjusting the cutoff frequency. If pass-
band performance is the priority, set FSEL high for the
maximum passband performance with a small compro-
mise in stopband attenuation. If stopband performance
is more important, set FSEL low for the maximum stop-
band attenuation with a small compromise in passband.
Due to the steep transition band response, the
MAX7454/MAX7455 can be used in both progressive
scan and interlaced video signals. The stopband atten-
uation at 27MHz or higher is >62dB.
Output BufferThe output buffer on the MAX7454/MAX7455 drives a
2VP-P signal into a 150Ωvideo load. It is intended to be
DC-coupled per the digital TV standard. No output AC-
MAX7454/MAX7455
HD/SD Switchable Video Filters and Buffers
MAX7454/MAX7455coupling capacitors are required when driving a cable,
thereby eliminating the normal adverse effects caused by
these large capacitors. The output DC level is controlled
to limit the DC voltage on the cable so the blanking level
of the video signal is always less than 1V, meeting the
digital TV specification. See the Output DC Levelsection
for more information.
The output of the MAX7454/MAX7455 can also be AC-
coupled when driving a high-impedance load. In anti-
aliasing applications, when the optimum bias point for
the converter needs to be established, the MAX7454/
MAX7455 can drive a high impedance (typ >1kΩ)
through an AC-coupling capacitor.
Gain OptionsThe MAX7454 features an overall gain of +6dB, while
the MAX7455 features an overall gain of +12dB.
Output DC LevelThe MAX7454/MAX7455 are DC-coupled circuits. The
nominal DC or nominal instantaneous AC voltage on
the outputs of the MAX7454/MAX7455 can be deter-
mined by the following equations:
VOUT= 2 x VIN+ 0.8V (MAX7454)
VOUT= 4 x VIN+ 0.8V (MAX7455)
For example, in the MAX7454, 0V on the input results in
an output nominal voltage of 0.8V, and a 0.3V input
(typical blanking level) results in an output nominal
level of 1.4V.
Applications Information
Input ConsiderationsThe inputs on the MAX7454/MAX7455 are normally DC-
coupled. Thus, no AC-coupling capacitors are
required. The input voltage range includes ground and
typically extends up to 1.2V. If the input is from a typi-
cal single supply current output DAC or encoder it can
be connected directly to the MAX7454/MAX7455. The
board trace should be kept as short as possible to min-
imize the parasitic stray capacitance. The MAX7454/
MAX7455 contribute 5pF of capacitance. For example,
a total capacitance on the input of approximately 20pF
causes a 100MHz pole if the DAC termination resistor is
75Ω. A pole at 100MHz introduces an additional 0.5dB
passband attenuation at 30MHz.
The input to the MAX7454/MAX7455 can be AC-cou-
pled. In this case, it is important to set the DC bias
properly to ensure that the negative peak of the video
signal is as near to zero volts as possible. The bias can
be fixed or a video clamp can be used. A video clamp
is preferable because it limits the total swing of the sig-
nal by holding the blanking level of the signal constant.
Output ConsiderationsThe outputs of the MAX7454/MAX7455 are normally
DC-coupled. No AC-coupling capacitors are required.
The MAX7454/MAX7455 connect directly to the video
cable with a 75Ωseries termination resistor. The other
end of the cable should also be properly terminated
with a 75Ωresistor. Because of the inherent divide-by-
two of this configuration the peak-to-peak amplitude as
well as the DC level of the signal are divided by two.
The biasing on the output of the MAX7454/MAX7455 is
such that the blanking level of the video signal on the
cable is always less than 1V, which complies with digi-
tal TV requirements.
Anti-Aliasing FilterThe MAX7454/MAX7455 can be used as an anti-alias-
ing filter to eliminate out-of-band noise in an analog-to-
digital video-sampling system. The output of the
MAX7454/MAX7455 can be DC- or AC-coupled. This
decision depends on the input range of the analog-to-
digital converter and the required accuracy of the
resulting digital blanking level. The output blanking
level of the MAX7454/MAX7455 is 1.4V with the nega-
tive peak of the signal at 0.8V and the positive peak
white at 2.8V. This assumes a 1VP-P input signal with
the negative peak at 0V. See the Electrical
Characteristicstable for the specified variations of
these values. If the DC and peak levels are not compat-
ible with the data-converter input, the outputs of the
MAX7454/MAX7455 need to be AC-coupled. Choose
an AC-coupling capacitor value that ensures that the
lowest frequency content in the video signal is passed
and the line time distortion is kept within desired limits.
The resulting capacitor value is dependent on the input
impedance of the converter circuit. Use a video clamp
to re-establish the DC level.
Power-Supply Bypassing and Layout
ConsiderationsThe MAX7454/MAX7455 operate from a single +5V
supply. Bypass each VCCto GND with a 0.1µF capaci-
tor and an additional 1µF capacitor in parallel if any sig-
nificant low-frequency disturbances are present in the
vicinity of the MAX7454/MAX7455. Use an extensive
ground plane to ensure optimum performance. The
three VCCpins (pins 13, 16, and 19) that supply the
individual channels can be connected together and
bypassed as one, provided the components are close
to the pins. Bypass the remaining VCC pin (pin 10)
separately with the same 0.1µF and 1µF capacitor com-
bination.
Place the input and output termination resistors as close
to the device as possible. Alternatively, the terminations
may be placed further from the device if the PC board
HD/SD Switchable Video Filters and Buffers
