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MAX11500USA+T
Three-Channel, High-Definition Video Filter
General DescriptionThe 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 person-
al video recorders.
The 6th-order channel filters have a typical -3dB band-
width of 33MHz. Each channel has an output buffer with
a gain of +6dB and can drive a full 2VP-Pvideo signal
into one standard 150Ωvideo 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.
The video inputs feature a transparent clamp for AC-
and 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 0°C to +85°C temperature
range, and is available in a small 8-pin SO package.
ApplicationsHigh-Definition Set-Top Box Receivers
HD Television Sets
HD Recorders
DVD Players
Personal Video Recorders
Video-On-Demand
FeaturesThree-Channel 6th-Order Filter for High-Definition
Video+6dB Output BuffersTransparent Input ClampsAC- or DC-Coupled InputsAC- or DC-Coupled OutputsOutput Buffers Drive One Standard 150ΩVideo
Load12kV HBM ESD Protection on OutputsSingle +5V Power SupplySmall 8-Pin SO package
MAX11500
Three-Channel, High-Definition Video FilterOUT3
GNDVCC
OUT1
OUT2IN2
IN3
IN1
TOP VIEW
MAX11500
Pin ConfigurationIN1OUT1
GND
VCC
33MHzTRANSPARENT
CLAMP+6dB
IN2OUT233MHzTRANSPARENT
CLAMP+6dB
IN3OUT333MHzTRANSPARENT
CLAMP+6dB
MAX11500
Typical Operating Circuit19-3212; Rev 0; 1/08
Ordering Information+Denotes a lead-free package.
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODEMAX11500USA+0°C to +85°C8 SOS8-2
EVALUATION KIT
AVAILABLE
MAX11500
Three-Channel, High-Definition Video Filter
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +5V, RLOAD= 150Ωto GND, CIN= 0.1µF, TA= 0°C to +85°C, unless otherwise specified. All frequency response is relative
to 100kHz.)
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.
Note 1:All devices are 100% production tested at TA= +25°C.
VCCto 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)
8-Pin SO (derate 5.9mW/°C above +70°C)...............470.6mW
Maximum Current into any Pin Except VCCand GND......±50mA
Operating Temperature Range
MAX11500USA...................................................0°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Junction Temperature......................................................+150°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS-1dB Bandwidthf1dBTA = +25°C2330MHz
-3dB Bandwidthf3dB33MHz
f = 37.125MHz6.5
f = 44.25MHz15.5Stopband AttenuationASB
f = 74.25MHz, TA = +25°C3248
Low-Frequency GainAV5.46.06.6dB
Low-Frequency Gain
MatchingAV(MATCH)0.01dB
Input Voltage RangeVINReferenced to GND if DC-coupled1.7V
VOUT = 1.4VP-P, f = 10MHz0.15
VOUT = 1.4VP-P, f = 15MHz0.2Total Harmonic
DistortionTHD
VOUT = 1.4VP-P, f = 22MHz0.8
Channel-to-Channel
CrosstalkXTALKf = 1MHz-72dB
Signal-to-Noise RatioSNRPeak signal (2VP-P) to RMS noise,
f = 100kHz to 30MHz68dB
Group Delaytgf = 100kHz25ns
Group-Delay DeviationΔtgf = 100kHz to 26MHz8ns
Supply Voltage RangeVCC4.7555.25V
Supply CurrentICCNo load2438mA
MAX11500
Three-Channel, High-Definition Video Filter
MAGNITUDE RESPONSE
(PASSBAND AND STOPBAND)MAX11500 toc01
FREQUENCY (MHz)
RESPONSE (dB)1
MAGNITUDE RESPONSE
(PASSBAND)
MAX11500 toc02
FREQUENCY (MHz)
RESPONSE (dB)1
GROUP DELAY
MAX11500 toc03
FREQUENCY (MHz)
DELAY (ns)1
2T RESPONSE
MAX11500 toc04
40ns/div
200mV/div
200mV/div
HD MULTIBURST RESPONSE
(1MHz–10MHz)MAX11500 toc05
4µs/div
200mV/div
200mV/div
HD MULTIBURST RESPONSE
(20MHz–30MHz)MAX11500 toc06
4µs/div
200mV/div
200mV/div
Typical Operating Characteristics(VCC= +5V, outputs AC-coupled with 220µF, RLOAD= 150Ωto GND, CIN= 0.1µF, TA= +25°C. All frequency response is relative to
100kHz.)
Detailed DescriptionThe MAX11500 integrates three high-definition (HD)
video filters, each with a transparent input clamp, a 6th-
order lowpass filter with a -3dB bandwidth of 33MHz,
and an output stage with a gain of 2V/V. The output sig-
nal is offset by typically 550mV to optimize driver per-
formance.
VOUT= 2 x VIN+ 0.55V
Typical voltage waveforms are shown in Figures 1 and 2.
Transparent ClampsAll 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 CouplingThe 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 sig-
nals 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 sig-
nals require AC-coupling. Examples of the latter are
SCART inputs and DACs terminated to VCC.
DC-Coupled InputsIf the input is DC-coupled, the voltage must remain
above zero but not exceed the maximum input voltage
of 1.7V (typical).
INPUT SIGNAL
0.3V
1.0V
0.0V
OUTPUT SIGNAL
1.15V
2.55V
0.55V
IN_OUT_
MAX11500
Figure 1. Typical AC-Coupled Signal
MAX11500
Three-Channel, High-Definition Video Filter
Pin Description
PINNAMEFUNCTIONIN1Video Input Channel 1IN2Video Input Channel 2IN3Video Input Channel 3
4VCCPower Supply. Bypass to GND with 0.1µF
and 1µF capacitors.GNDGroundOUT3Video Output Channel 3OUT2Video Output Channel 2OUT1Video Output Channel 1
AC-Coupled InputsIf 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
(IL) of typically 0.5µA and thus the bias voltage is
derived as follows:
HD FiltersThe internal filters are optimized to deliver a flat pass-
band along with high stopband attenuation. The filter
characteristic has been chosen to provide an excellent
time-domain response with low overshoot. The typical
-3dBfrequency of 33MHz guarantees low attenuation
in the passband, while at the same time allowing for a
typical attenuation of -48dB at 74.25MHz.RVIxRBCCL ( )=+−21
MAX11500
Three-Channel, High-Definition Video FilterINPUT SIGNAL
0.32V
1.02V
0.02V
0.00V
OUTPUT SIGNAL
1.19V
2.59V
0.59V
IN_OUT_
MAX11500
Figure 2. Typical DC-Coupled Signal
IN_
MAX11500
0.1µF
ENCODER
DAC
Figure 3. AC-Coupling for Unipolar Signals (Y, R, G, B)
IN_
820kΩ
120kΩ
MAX11500
0.1µF
ENCODER
DAC
VCC
Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr)
MAX11500
Three-Channel, High-Definition Video Filter
Output BufferThe MAX11500 features output buffers with +6dB gain
that drive a standard 150Ωvideo load. A typical load
consists of a 75Ωbackmatch resistor, an optional
220µF or larger coupling capacitor, and a 75Ωtermina-
tion resistor. The offset between input and output sig-
nals 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 ConsiderationsThe MAX11500 outputs can be DC- or AC-coupled.
The MAX11500, with +6dB gain, is typically connected
to a 75Ωseries backmatch resistor followed by the
video cable. If an AC connection is used, choose an
AC-coupling capacitor value that ensures that the low-
est 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 imped-
ance and more importantly the input leakage of the cir-
cuit being driven. Common industry practice is to use a
220µF or larger capacitor.
The outputs of the MAX11500 are fully protected
against a short circuit either to the ground or the posi-
tive 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 RecommendationsThe device is thermally designed to operate with mini-
mum copper. However, to help with heat dissipation,
connect the power and ground traces to large copper
areas if possible. Bypass VCCto GND with a 0.1µF
capacitor and an additional 1µF capacitor in parallel for
additional low-frequency decoupling. Using surface-
mount 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 possi-
ble with the MAX11500.
For a recommended PCB layout, refer to the MAX11500
EV kit data sheet.
