MAX7454 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – HD/SD Switchable Video Filters and Buffers

19-3482; Rev 0; 10/04
EVAALVUAAILTAIOBNLEKIT
HD/SD Switchable Video Filters and Buffers
General Description
The MAX7454/MAX7455 triple-channel video recon-
struction filters and buffers are ideal for high definition
(HD), standard definition progressive scan/noninter-
laced (SDp), and standard definition interlaced (SDi)
television applications. These devices are a fully inte-
grated solution for filtering and buffering HD and/or
SDp/SDi TV signals in component video output format
(Y P_B P_R or RGB). The MAX7454/MAX7455 are compati-
ble with the 1080i, 720p, 480p, and 480i scanning system
standards. In addition to having an HD/SD switchable
frequency response, the magnitude response can be
optimized by approximately 15% by a control input.
The input and output signals are DC-coupled to the
MAX7454/MAX7455, eliminating the large output AC-cou-
pling capacitors normally used. The MAX7454/MAX7455
output buffers drive a 2V_P-P video signal into a standard
150Ω load. The MAX7454 has a gain of +6dB and the
MAX7455 has a gain of +12dB. Both devices are available
in a 20-pin TSSOP package and are fully specified over
the upper commercial (0°C to +85°C) temperature range.
Applications
Set-Top Boxes
Direct-Broadcast Satellite (DBS) Receiver
DVD Players
Hard-Disk Recorders
HDTV (LCD, PDP, DLP)
Professional Cameras
Pin Configuration appears at end of data sheet.
Features
♦ 30MHz High Definition (HD)/10MHz Standard
Definition (SD) Switchable Video Reconstruction
Filter
♦ 15% Magnitude Response Adjustment
♦ Passband: -2.3dB at 30MHz
-0.40dB at 10MHz
-0.10dB at 5MHz
♦ Stopband: -55dB at 74MHz (HDTV)
-62dB at 27MHz (SDTV)
♦ Output Blank Level <1V for DC-Coupled Output
♦ +6dB Gain (MAX7454) or +12dB Gain (MAX7455)
♦ Direct Coupled Input, Zero Tilt
♦ Direct Coupled Output, No Large Output Capacitor
♦ Drives 2V_P-P Signal in 150Ω Video Load
♦ Small 20-Pin TSSOP Package
♦ Single +5V Supply
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
BUFFER
GAIN (dB)
MAX7454UUP 0°C to +85°C 20 TSSOP-EP**
+6
MAX7454UUP+* 0°C to +85°C 20 TSSOP-EP**
+6
MAX7455UUP* 0°C to +85°C 20 TSSOP-EP**
+12
MAX7455UUP+* 0°C to +85°C 20 TSSOP-EP**
+12
+Indicates lead-free packaging.
*Future product—contact factory for availability.
**EP = Exposed pad.
Typical Operating Circuit
+5V
VCC
ENCODER
Y/R
D/A
Pb/G
D/A
Pr/B
D/A
MAX7454/MAX7455
IN1
SWITCHABLE
LOWPASS
FILTER
IN2
SWITCHABLE
LOWPASS
FILTER
IN3
SWITCHABLE
LOWPASS
FILTER
+6dB OR
+12dB
2
+6dB OR
+12dB
2
+6dB OR
+12dB
OUT1 ^75Ω
OUT2 ^75Ω
ZO = 75Ω
75Ω
ZO = 75Ω
75Ω
OUT3 ^75Ω
ZO = 75Ω
75Ω
FSEL
SD/HD
GND
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