General Description

The MAX7481/MAX7482 bidirectional video filters/

buffers provide the reconstruction filter and line drive

buffer for both composite (CVBS) and S-Video (Y/C)

video signals in playback mode, and anti-aliasing in

record mode for portable media devices. Each channel

consists of a lowpass filter and an output buffer capa-

150

Ω load (DC-coupled to ground). In record mode,

the MAX7481/MAX7482 output buffers have a gain of

+6dB. In playback mode, the MAX7481 output buffers

have a gain of +6dB and the MAX7482 output buffers

have a gain of +7dB.

The MAX7481/MAX7482 feature DirectDriveâ„¢ by utilizing

an internal negative charge pump and regulator to main-

tain the output blanking level at ground, eliminating the

need for a negative supply voltage, a large output cou-

pling capacitor, or a sag correction configuration.

The MAX7481/MAX7482 operate from a single +2.7V to

+3.6V power supply. These devices are available in a

space-saving 28-pin TQFN package and operate over

the -40°C to +85°C extended temperature range.

Applications

Portable Media Devices

Digital Camcorders

Digital Cameras

Features

♦ Composite and S-Video, Video-Playback and Video-

Record Interface for Portable Video Devices

♦ Saves Space by Sharing Connectors in Portable

Devices

♦ DirectDrive

Eliminates Expensive AC-Coupling Capacitors

Blanking Level at Ground with Single Supply

♦ Composite and Y/C Signals

♦ Advanced Power-Down Modes for Extended

Battery Life

♦ Low Supply Current in Shutdown Mode, < 1µA (typ)

♦ Filter Response Ideal for NTSC and PAL

♦ +6dB (MAX7481) or +7dB (MAX7482) Gain

♦ +2.7V to +3.6V Single-Supply Operation

♦ Small, 28-Pin, TQFN Package (5mm x 5mm)

Bidirectional Video Filters/Buffers for Composite

and S-Video Portable Media Devices

________________________________________________________________

Maxim Integrated Products

1

19-0671; Rev 0; 11/06

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.

Simplified Block Diagram

Ordering Information

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX7481ETI+

-40°C to +85°C

28 TQFN-EP*

T2855-6

MAX7482ETI+

-40°C to +85°C

28 TQFN-EP*

T2855-6

CVBSON

YCON

P/R

LPF

LPF

VIDEO

ADC

VIDEO

DAC

VIDEO

ADC

CONTROL

LOGIC

VIDEO

DAC

VIDEO

PROCESSOR

IN1

IN2

IN3

IN4

IN5

OUT1

OUT2

OUT3

OUT5

OUT4

0V

0V

0V

0V

MAX7481

MAX7482

RECORD SIGNAL FLOW

PLAYBACK SIGNAL FLOW

+

Denotes lead-free package.

*

EP = Exposed pad.

Pin Configuration appears at end of data sheet.