Features: Back-Porch of Video Output Signal Clamped to Ground
Eliminates Input/Output AC-Coupling Capacitors
0.1% Line-Time Distortion
Stopband: 55dB at 27MHz
Passband: ±0.8dB out to 5MHz
Diff Gain = 0.05%, Diff Phase = 0.05 Degrees
Output Clamped to Ground with Loss of Input
Each Output Drives Two 150 Video Loads
Up to 2dB of High-Frequency Boost Control
Ideal for CVBS, Y/C (S-Video), and RGB (Y, Pb, Pr) Outputs for NTSC, PAL, and SDTV
Filter Bypass Mode
Small 20-Pin 5mm ✕ 5mm Thin QFN PackageApplicationSet-Top Boxes/HDR/DVD
Game Consoles
Camcorders
Composite, Component,
S-Video Output for
NTSC, PAL, SDTVPinout
SpecificationsVCC to GND..............................................................-0.3V to +6V
VSS to GND...............................................................-6V to +0.3V
OUT_ to GND ........................................................-2.5V to +3.5V
All Other Pins to GND ......................(VSS - 0.3V) to (VCC + 0.3V)
Maximum Current into Any Pin .........................................±50mA
Continuous Power Dissipation (TA = +70°C)
20-Pin 5mm x 5mm Thin QFN (derate 20.8mW/°C
above +70°C)......................................... ..................1666.7mW
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
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.
DescriptionThe MAX7438/MAX7439 three-channel standard definition 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 capable of driving two standard 150 video loads. The blanking level of the output video signal on each channel 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 operate from ±5V dual supplies.
The three-channel MAX7438/MAX7439 are ideal for Y, Pb, Pr, and RGB component video signals, three composite ideo signals, and also Y/C plus CVBS video signals. 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.
MAX7438 Data Sheet
