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PDF MAX11500 Data sheet ( Hoja de datos )
| Número de pieza | MAX11500 | |
| Descripción | High-Definition Video Filter | |
| Fabricantes | Maxim Integrated | |
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19-3212; Rev 0; 1/08
EVAALVUAAILTAIOBNLEKIT
Three-Channel, High-Definition Video Filter
General Description
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 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-P video signal
into one standard 150Ω 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.
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.
Applications
High-Definition Set-Top Box Receivers
HD Television Sets
HD Recorders
DVD Players
Personal Video Recorders
Video-On-Demand
Typical Operating Circuit
VCC
MAX11500
IN1
TRANSPARENT
CLAMP
33MHz
+6dB
OUT1
IN2
TRANSPARENT
CLAMP
33MHz
+6dB
OUT2
IN3
TRANSPARENT
CLAMP
33MHz
+6dB
OUT3
Features
♦ Three-Channel 6th-Order Filter for High-Definition
Video
♦ +6dB Output Buffers
♦ Transparent Input Clamps
♦ AC- or DC-Coupled Inputs
♦ AC- or DC-Coupled Outputs
♦ Output Buffers Drive One Standard 150Ω Video
Load
♦ 12kV HBM ESD Protection on Outputs
♦ Single +5V Power Supply
♦ Small 8-Pin SO package
Ordering Information
PART
TEMP RANGE
MAX11500USA+ 0°C to +85°C
+Denotes a lead-free package.
PIN-
PACKAGE
8 SO
PKG
CODE
S8-2
TOP VIEW
Pin Configuration
+
IN1 1
IN2 2
IN3 3
MAX11500
VCC 4
SO
8 OUT1
7 OUT2
6 OUT3
5 GND
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.
1 page  
Three-Channel, High-Definition Video Filter
2.59V
1.02V
INPUT SIGNAL
MAX11500
IN_ OUT_
1.19V
OUTPUT SIGNAL
0.32V
0.02V
0.00V
Figure 2. Typical DC-Coupled Signal
0.59V
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
(IL) of typically 0.5µA and thus the bias voltage is
derived as follows:
VB
=
R2
R1 + R2
(VCC
−
IL
x
R1)
HD Filters
The 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
-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.
ENCODER
DAC
MAX11500
0.1µF
IN_
Figure 3. AC-Coupling for Unipolar Signals (Y, R, G, B)
ENCODER
DAC
0.1µF
VCC
R1
820kΩ
MAX11500
IN_
R2
120kΩ
Figure 4. AC-Coupling for Bipolar Signals (Pb, Pr)
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX11500.PDF ] | |
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