MAX7481 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Bidirectional Video Filters/Buffers for Composite and S-Video Portable Media Devices

19-0671; Rev 0; 11/06
Bidirectional Video Filters/Buffers for Composite
and S-Video Portable Media Devices
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-
ble of driving a full 2V_P-P video signal into one standard
150Ω 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 DirectDrive™ 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
VIDEO
ADC
OUT4
VIDEO ^0V
IN1
DAC
LPF
VIDEO
PROCESSOR
P/R
CVBSON
YCON
CONTROL
LOGIC
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)
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
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Simplified Block Diagram
MAX7481
MAX7482
PLAYBACK SIGNAL FLOW
OUT1
IN3
0V
IN5
OUT3
VIDEO
IN2
DAC
LPF
VIDEO ^0V
ADC
OUT5
OUT2
0V
IN4
RECORD SIGNAL FLOW
________________________________________________________________ Maxim Integrated Products 1
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.