MAX7438ETP+T Maxim Integrated, MAX7438ETP+T Datasheet

no-image

MAX7438ETP+T

Manufacturer Part Number
MAX7438ETP+T
Description
Active Filter Integrated Circuits (ICs)
Manufacturer
Maxim Integrated
Datasheet
1.MAX7438ETP-T.pdf (10 pages)

Specifications of MAX7438ETP+T

Number Of Channels
3
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
TQFN EP
Minimum Operating Temperature
- 40 C
Factory Pack Quantity
2500
The MAX7438/MAX7439 three-channel standard defini-
tion video reconstruction filters include a back-porch
clamp that sets the output blanking level of the video
signal to ground. Each channel of the MAX7438/
MAX7439 combines a lowpass filter with adjustable
high-frequency boost levels and an output buffer capa-
ble of driving two standard 150Ω video loads. The
blanking level of the output video signal on each chan-
nel is clamped to ground, eliminating the need for large
AC-coupling output capacitors. Direct input coupling
circuitry eliminates the need for AC-coupling input
capacitors. This DC-in/DC-out architecture results in
extremely low line-time distortion. The MAX7438/
MAX7439 are ideal for antialiasing and DAC smoothing
in digital video devices such as STBs, DVDs, PVRs,
and hard disk recorders. The MAX7438/MAX7439 oper-
ate from ±5V dual supplies.
The three-channel MAX7438/MAX7439 are ideal for Y,
P
posite video signals, and also Y/C plus CVBS video sig-
nals. Each filter channel achieves 60dB of attenuation at
27MHz and a maximally flat passband from DC to 5MHz.
The MAX7438 offers an internal gain of +2V/V, while the
MAX7439 offers a gain of +3V/V.
19-2857; Rev 0; 4/03
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.
b
Set-Top Boxes/HDR/DVD
Game Consoles
Camcorders
Triple-Channel Video Reconstruction Filters with
, P
r
, and RGB component video signals, three com-
ENCODER
________________________________________________________________ Maxim Integrated Products
DAC1
DAC2
DAC3
HFB1
HFB2
HFB3
General Description
IN1
IN2
IN3
Composite, Component,
S-Video Output for
NTSC, PAL, SDTV
Applications
V
CC
HIGH-FREQUENCY
BOOST CONTROL/
= +5V
MAX7438
MAX7439
BACK-PORCH
BYPASS
DETECTOR
LOWPASS
LOWPASS
LOWPASS
FILTER
FILTER
FILTER
V
SS
= -5V
Back-Porch Clamp to GND
GND
GAIN/LEVEL
GAIN/LEVEL
GAIN/LEVEL
GENERATOR
o Back-Porch of Video Output Signal Clamped to
o Eliminates Input/Output AC-Coupling Capacitors
o 0.1% Line-Time Distortion
o Stopband: 55dB at 27MHz
o Passband: ±0.8dB out to 5MHz
o Diff Gain = 0.05%, Diff Phase = 0.05 Degrees
o Output Clamped to Ground with Loss of Input
o Each Output Drives Two 150Ω Video Loads
o Up to 2dB of High-Frequency Boost Control
o Ideal for CVBS, Y/C (S-Video), and RGB (Y, P
o Filter Bypass Mode
o Small 20-Pin 5mm
*EP = Exposed paddle
Pin Configuration appears at end of data sheet.
SHIFT
SHIFT
SHIFT
MAX7438ETP
MAX7439ETP
BIAS
Ground
Outputs for NTSC, PAL, and SDTV
EXT
10kΩ
PART
-40°C to +85°C
-40°C to +85°C
OUT1
OUT3
TEMP RANGE
OUT2
Ordering Information
✕
5mm Thin QFN Package
Functional Diagram
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
Z
Z
Z
0
0
0
= 75Ω
= 75Ω
= 75Ω
Z
Z
Z
0
0
0
= 75Ω
= 75Ω
= 75Ω
75Ω
75Ω
75Ω
PIN-PACKAGE
20 Thin QFN-EP*
20 Thin QFN-EP*
75Ω
75Ω
Features
75Ω
b,
P
r
)
1

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MAX7438ETP+T Summary of contents

Page 1

... IN2 DAC2 IN3 DAC3 HFB1 HFB2 HFB3 ________________________________________________________________ Maxim Integrated Products 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. Back-Porch Clamp to GND o Back-Porch of Video Output Signal Clamped to Ground o Eliminates Input/Output AC-Coupling Capacitors o 0 ...

Page 2

Triple-Channel Video Reconstruction Filters with Back-Porch Clamp to GND ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0. GND...............................................................-6V to +0.3V SS OUT_ to GND ........................................................-2.5V to +3.5V All Other Pins to GND ......................(V SS Maximum Current ...

Page 3

Triple-Channel Video Reconstruction Filters with ELECTRICAL CHARACTERISTICS (continued +5V ±5 -5V ±5 20pF unless otherwise noted. Typical values are at T OUT A ...

Page 4

Triple-Channel Video Reconstruction Filters with Back-Porch Clamp to GND (V = +5V -5V 150Ω OUT_ MAX7439 PASSBAND AMPLITUDE vs. FREQUENCY 2.5 BOOST 4 2.0 1.5 BOOST 3 1.0 BOOST 2 0.5 0 -0.5 ...

Page 5

Triple-Channel Video Reconstruction Filters with (V = +5V -5V 150Ω OUT_ SUPPLY CURRENT VS. TEMPERATURE 140 105 + - - ...

Page 6

Triple-Channel Video Reconstruction Filters with Back-Porch Clamp to GND PIN NAME 10, GND Ground 11, 13, 15 IN1 Channel 1 Video Input Channel 1 High-Frequency Boost and Filter Bypass Control Input. Connect external resistors to ...

Page 7

Triple-Channel Video Reconstruction Filters with BACK PORCH FRONT PORCH COLOR BURST H-SYNC TIP Figure 1. Standard Video Signal external resistors form a voltage-divider between V and GND. The values in the fourth column (V are calculated using the following equation: ...

Page 8

Triple-Channel Video Reconstruction Filters with Back-Porch Clamp to GND ENCODER DAC3 DAC2 DAC1 HFB1-1 R HFB1 75Ω 0 75Ω 75Ω 75Ω 0 75Ω 75Ω 1µF Microprocessor Control of High-Frequency Boost and Bypass Use ...

Page 9

Triple-Channel Video Reconstruction Filters with Pin Configuration TOP VIEW GND 1 IN1 2 MAX7438 HFB1 3 MAX7439 GND 4 *CONNECT EXPOSED PADDLE OUT1 5 5mm ✕ 5mm THIN QFN _______________________________________________________________________________________ Back-Porch Clamp to GND TRANSISTOR COUNT: 6418 ...

Page 10

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products ...

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