MAX7444ESA+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX7444ESA+ ,Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C OutputsApplicationsMAX7444ETA 8 Thin QFN-EP* AFY T833-1MAX7444ESA 8 SO-EP* — S8E-12Set-Top Boxes/HDR/DVD D ..
MAX744A ,5V, Step-Down, Current-Mode PWM DC-DC ConvertersELECTRICAL CHARACTERISTICS(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/M ..
MAX744ACPA ,5V, step-down, current-mode PWM DC-DC converter accept inputs between 65V and 16V and deliver 750mA. 159kHz to 212.5kHz guaranteed oscillator frequency limits.ELECTRICAL CHARACTERISTICS(Circuit of Figure 3, V+ = 9V for the MAX730A, V+ = 12V for the MAX738A/M ..
MAX744ACPA+ ,5V, Step-Down, Current-Mode PWM DC-DC ConvertersApplicationsMAX730AC/D 0°C to +70°C Dice*Portable InstrumentsMAX730AEPA -40°C to +85°C 8 Plastic DI ..
MAX744ACWE ,5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX744ACWE ,5V, Step-Down, Current-Mode PWM DC-DC Converters
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory

MAX7444ESA+
Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
General Description
The MAX7443/MAX7444 are low-cost, triple-channel
video reconstruction filters for S-video and CVBS video
signals. These devices are ideal for anti-aliasing and
DAC smoothing video applications such as set-top
boxes, DVD players, hard-disk recorders (HDRs), and
personal video recorders. These filters operate from a
single +5V supply. They are optimized for NTSC, PAL,
and standard-definition digital TV (SDTV) video systems.
Each channel consists of a lowpass filter and an
adjustable-gain output buffer capable of driving two
standard 150Ωvideo 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 com-
posite video output. The MAX7444 offers high-
frequency boost to improve picture sharpness. The
MAX7443 has a maximum flat-frequency response.
The MAX7443/MAX7444 are available in a tiny 8-pin thin
QFN and an 8-pin SO package with exposed pad, and
are fully specified over the -40°C to +85°C extended
temperature range.
Applications
FeaturesTriple-Channel Filter and Buffer for CVBS and
Y/C (S-Video) Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals41dB (typ) Stopband Attenuation at 27MHz-0.3dB (typ) Passband ResponseLow Blanking Level Voltage Allows DC-Coupled
OutputEach Channel Drives Two 150ΩVideo Loads+5V Single-Supply VoltageTiny 8-Pin Thin QFN or 8-Pin SO Packages
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
Ordering Information
19-2749; Rev 1; 1/06
EVALUATION KIT
AVAILABLE
PARTPIN-PACKAGETOP
MARK
PKG
CODE
MAX7443ETA8 Thin QFN-EP*AFXT833-1
MAX7443ESA8 SO-EP*—S8E-12
MAX7444ETA8 Thin QFN-EP*AFYT833-1
MAX7444ESA8 SO-EP*—S8E-12
D/ACINLOWPASS
FILTER
LOWPASS
FILTER
YIND/A
6dB/
9.5dB/
12dB
6dB/
9.5dB/
12dB
6dB/
9.5dB/
12dB
GSET
COUT
CVOUT
YOUT
*OPTIONAL
GND
VCC
ENCODER
MAX7443
MAX7444
Functional Diagram
Set-Top Boxes/HDR/DVD
Security Cameras/Digital
Cameras
Game Consoles
Digital VCRs
Every Composite,
S-Video Output for NTSC,
PAL, SDTV
Note:All devices specified over -40°C to +85°C temperature
range.
*EP = Exposed pad.
Selector Guide appears at end of data sheet.
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
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 (VCC+ 0.3V)
Maximum Current into Any Pin Except VCCand GND.....±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin Thin QFN (derate 24.4mW/°C above +70°C)...1951mW
8-Pin SO (derate 18.9mW/°C above +70°C)..............1509mW
Operating Temperature Range...........................-40°C to +85°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, RL= 75Ωto GND for DC-couple, RL= 75Ωto VCC/2 for AC-couple, CYIN= CCIN= 0.1µF, = TMINto TMAX, GSET = GND (6dB) and VCC(9.5dB), unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
MAX7443-0.8-0.3+0.1Passband Responsef = 100kHz to 4.2MHz,
relative to 100kHzMAX7444-0.1+0.6+0.92dB
Stopband AttenuationASBf = 27MHz3941dB
Boost Amplitudef = 4.2MHz, MAX74440.6dB
Differential GaindG5-step modulated
staircase
Gain = 6dB,
9.5dB, 12dB0.150.4%
Differential Phasedθ5-step modulated
staircase
Gain = 6dB,
9.5dB, 12dB0.150.4Degrees
Signal-to-Noise RatioSNR
Peak signal (2VP-P) to
RMS noise, f = 100Hz to
50MHz
Gain = 6dB,
9.5dB, 12dB6773dB
MAX7443820Group Delay DeviationΔtgDeviation from 100kHz to
4.1MHzMAX74441230ns
Line-Time DistortionHDIST18µs, 100 IRE bar0.3%
Field-Time DistortionVDIST130 lines, 18µs, 100 IRE bar0.5%
Clamp Settling TimeTo ±1%430Lines
YOUT0.60.81.0
CVOUT0.60.81.0Output DC Clamp Level
COUT1.441.61.97
Low-Frequency Gain AccuracyAVf = 100kHz, relative to 6dB-3.5+2%
Group Delay Matchingtg(MATCH)Low-frequency channel-to-channel matching,
f = 100kHz for YOUT and COUT2ns
Channel-to-Channel CrosstalkXTALKf = 100kHz to 3.58MHz, gain = 6dB61dB
Input Leakage CurrentIIN10µA
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +5V ±5%, CL= 0 to 20pF, RL= 75Ωto GND for DC-couple, RL= 75Ωto VCC/2 for AC-couple, CYIN= CCIN= 0.1µF, = TMINto TMAX, GSET = GND (6dB) and VCC(9.5dB), unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
YINP-PGSET = GND (6dB)1.2Input Dynamic SwingCINP-PGSET = GND (6dB)0.9VP-P
SUPPLY
Supply Voltage RangeVCC4.755.25V
Supply CurrentICCVCC = +5.25V, no load88110mA
Power-Supply Rejection RatioPSRRVIN = 100mVP-P, f = 0 to 3.5MHz33dB
Typical Operating Characteristics
(VCC= +5V, TA= +25°C, unless otherwise noted.)
AMPLITUDE vs. FREQUENCY
MAX7443/44 toc01
FREQUENCY (MHz)
AMPLITUDE (dB)
NORMALIZED TO 0dB
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7443/44 toc02
FREQUENCY (MHz)
AMPLITUDE (dB)
NORMALIZED TO 0dB
MAX7443
MAX7444
PHASE RESPONSE vs. FREQUENCY
MAX7443/44 toc03
FREQUENCY (MHz)
PHASE (DEGREES)
GROUP DELAY vs. FREQUENCY
MAX7443/44 toc04
FREQUENCY (MHz)
GROUP DELAY (ns)
2T RESPONSE (1 IRE = 7.14mV)
MAX7443/44 toc05
200ns/div
YIN
200mV/div
YOUT
400mV/div
MODULATED 12.5T RESPONSE
(1 IRE = 7.14mV)
MAX7443/44 toc06
400ns/div
YIN
200mV/div
YOUT
200mV/div
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
SUPPLY CURRENT
vs. TEMPERATURE
MAX7443/44 toc07
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
DIFFERENTIAL GAIN
MAX7443/44 toc08
DIFFERENTIAL PHASE (DEGREES)2456724567
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE
MULTIBURST RESPONSE
MAX7443/44 toc09
YIN
200mV/div
YOUT
200mV/div
10µs/div
Typical Operating Characteristics (continued)
(VCC= +5V, TA= +25°C, unless otherwise noted.)
Detailed Description
The primary function of the MAX7443/MAX7444 is to fil-
ter and buffer the encoder DAC outputs that contain
digital video information in applications such as set-top
boxes, hard-disk recorders, DVD players, and digital
VCRs. These devices reconstruct and clean up analog
video signals. Each MAX7443/MAX7444 consists of a
lowpass filter and an adjustable-gain output video
buffer that is capable of driving two standard 150Ω
video loads. The luma (YIN) and chroma (CIN) video
inputs are summed internally to provide the composite
(CVOUT) video output.
These devices operate from a single +5V supply. The
filters have a nominal cutoff frequency optimized for
NTSC, PAL, and SDTV.
Filter
Filter Response
The reconstruction filter consists of two 2nd-order
Sallen-Key stages. The Butterworth-type response fea-
tures a maximally flat passband for NTSC and PAL
bandwidths. The stopband offers 41dB (typ) of attenua-
tion at sampling frequencies of 27MHz and above (see
Typical Operating Characteristics).
High-Frequency Boost
The high-frequency boost available in the MAX7444
compensates for signal degradation and rolloff in the
video encoder, which increases the image sharpness.
The MAX7443 has a flat response over the video band-
width.
Output Buffer
The output buffer drives two 150Ωvideo loads with a
2VP-Psignal. The adjustable gain of the output buffer
provides a gain of 6dB, 9.5dB, and 12dB, which are
selected by tying the GSET pin to GND, VCC, or float-
ing, respectively. The MAX7443/MAX7444 can drive an
AC load or drive the video load directly without using
the large output capacitor. The output buffer drives a
DC load with an output blanking level of less than 1V.
PINNAMEFUNCTIONYINLuma (Y) InputGSETGain-Setting Control Input. See Table 1
for values.CINChroma (C) InputGNDGround
5VCC5V Power SupplyCOUTChroma (C) OutputCVOUTComposite Video OutputYOUTLuma (Y) Output
Pin Description
12dB Gain Setting
The GSET pin is biased internally to VCC/2 through two
100kΩresistors from VCCto GND. The internal imped-
ance at the node is 50kΩ. No additional connection is
necessary since the pin offers a minimum noise margin
immunity of 1VP-P.
Output Clamp Level
When sync pulses in the luma signal (Y) are detected,
the DCrestore loop is activated. The function of the
loop is to set the sync tip of the video signal to the
desired DC level of 0.8V for YOUT and COUT and the
average DC voltage of COUT at 1.6V.
Applications Information
Input Considerations
Use a 0.1µF ceramic capacitor to AC-couple the input
to the MAX7443/MAX7444. This input capacitor stores
a DC level such that the outputs are clamped to the
appropriate DC voltage level.
Output Considerations
The outputs of the MAX7443/MAX7444 are typically
connected to a 75Ωseries back-match resistor fol-
lowed by the video cable. Because of the inherent
divide by two of this configuration, the blanking level of
the video cable is always less than 1V, which complies
with industry-standard video requirements. The video
buffer can also drive an AC-coupled video load. Good
video performance is achieved with an output capacitor
as low as 220µF.
Power-Supply Bypassing and Layout
The MAX7443/MAX7444 operate from a single +5V
supply. Bypass VCCto GND with a 0.1µF capacitor.
Place all external components as close to the device as
possible. Refer to the MAX7443 evaluation kit for a
proven PC board layout example.
Exposed Pads
Both the SO and thin QFN packages of the MAX7443/
MAX7444 have exposed pads on the bottom of the
packages. These pads are electrically connected to
GND and should be connected to the ground plane for
improved thermal conductivity. Do not route signals
under these packages.
Chip Information
TRANSISTOR COUNT: 4252
PROCESS: BiCMOS
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
GSETGAIN (dB)
GND6
VCC9.5
Open12
Table 1. Gain-Setting Control
COUT
VCCGND
YOUT
CVOUTGSET
CIN
YIN
THIN QFN
TOP VIEW
COUT
VCCGND
YOUT
CVOUTGSET
CIN
YIN
MAX7443
MAX7444
MAX7443
MAX7444
Pin Configurations
Selector Guide
PARTHIGH-FREQUENCY BOOST
MAX7443ETANo
MAX7443ESANo
MAX7444ETAYes
MAX7444ESAYes
MAX7443/MAX7444riple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
8L, SOIC EXP. PAD.EPS121-0111
PACKAGE OUTLINE
8L SOIC, .150" EXPOSED PAD
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to /packages.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX7444ESA+ \|MAX7444ESA	MAXIM	N/a	44	avai	Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs