Maxim MAX7453, MAX7453CSA Datasheet
General Description
The MAX7453 is a low-cost, triple-channel video reconstruction filter for S-video and CVBS video-signal applications. This device is ideal for anti-aliasing and DAC
smoothing video applications such as set-top boxes,
DVD players, hard-disk recorders (HDRs), and personal
video recorders. This filter operates from a single +5V
supply. It is optimized for NTSC, PAL, and standard-definition TV (SDTV) video systems.
Each channel consists of a lowpass filter and an output
buffer capable of driving one (YOUT, COUT) or two
(CVOUT) standard 150Ω video loads. The output buffers
can drive either an AC or a DC load such that the blanking level voltage after the backmatch resistor is less than
1V. The Y and C video inputs are summed to produce
the composite video output. The MAX7453 has a maximally flat frequency response.
The MAX7453 is available in an 8-pin SO package and is
fully specified over the commercial (0°C to +70°C) temperature range.
Applications
Set-Top Boxes/HDRs/DVDs
Security Cameras/Digital Cameras
Game Consoles
Digital VCRs
Every Composite, S-Video Output for NTSC,
PAL, and SDTV
Features
♦ Triple-Channel Filter and Buffer for CVBS and
Y/C (S-Video) Video Signals
♦ Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals
♦ 42dB (typ) Stopband Attenuation at 27MHz
♦ -0.3dB (typ) Passband Response
♦ <1V Blanking Level Allows DC-Coupled Output
♦ CVOUT Drives Two 150Ω Video Loads
♦ YOUT and COUT Drive One 150Ω Video Load
♦ +5V Single-Supply Voltage
♦ 8-Pin SO Package
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
________________________________________________________________ Maxim Integrated Products 1
19-3269; Rev 0; 6/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
D/A
CIN
LOWPASS
FILTER
LOWPASS
FILTER
YIN
D/A
Σ
COUT
CVOUT
YOUT
*
GND
V
CC
*
*
*
ENCODER
MAX7453
+6dB
+6dB
+6dB
Functional Diagram
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX7453CSA 0°C to +70°C 8 SO
Pin Configuration
TOP VIEW
YIN
N.C.
GND
1
2
MAX7453
3
4
SO
87YOUT
V
CC
CVOUT
6
COUTCIN
5
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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 ...........................................................................+6V
All Other Pins to GND.................................-0.3V to (V
CC
+ 0.3V)
Maximum Current into Any Pin Except V
CC
and GND .....±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO ....................................................................522.8mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VCC= +5V ±5%, CL= 0 to 20pF, all loads to GND for DC-couple, all loads to V
CC
/ 2 for AC-couple, C
YIN
= C
CIN
= 0.1µF,
R
YOUT
= 150Ω, R
COUT
= 150Ω, R
CVOUT
= 75Ω, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Passband Response f = 100kHz to 4.2MHz, relative to 100kHz
0dB
Stopband Attenuation A
SB
f = 27MHz 39 42 dB
Chroma/Luma Gain f = 3.58MHz, reference to CVOUT at 336kHz 96 98
%
Differential Gain dG 5-step modulated staircase
%
Differential Phase dθ 5-step modulated staircase
Degrees
Signal-to-Noise Ratio SNR
Peak signal (2V
P-P
) to RMS noise,
f = 100Hz to 50MHz
67 73 dB
Line-Time Distortion H
DIST
18µs, 100IRE bar
%
Field-Time Distortion V
DIST
130 lines, 18µs, 100IRE bar
%
Clamp Settling Time To ±1%
Lines
YOUT
CVOUT
Output DC Clamp Level
COUT
V
Low-Frequency Gain Accuracy A
V
f = 100kHz, relative to 6dB
%
Group-Delay Deviation ∆t
g
Deviation from 100kHz to 4.1MHz 8 16 ns
Group-Delay Matching
f = 100kHz for YOUT and COUT
2ns
Channel-to-Channel Crosstalk X
TALK
f = 100kHz to 3.58MHz 61 dB
Input Leakage Current I
IN
10 µA
Y
INP-P
Input Dynamic Swing
C
INP-P
V
P-P
SUPPLY
Supply Voltage Range V
CC
V
Supply Current I
CC
VCC = +5.25V, no load 65 85 mA
Power-Supply Rejection Ratio PSRR V
IN
= 100mV
P-P
, f = 0 to 3.5MHz 33 dB
-0.6 -0.27
0.15 0.5
0.15 0.5
100
tg(MATCH)
Low-frequency channel-to-channel matching,
0.3
0.5
300
0.60 0.8 0.95
0.60 0.8 0.95
1.44 1.6 1.95
-3.0 +2.0
4.75 5.25
1.2
0.9
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