|
|
PDF MAX7455 Data sheet ( Hoja de datos )
| Número de pieza | MAX7455 | |
| Descripción | (MAX7454 / MAX7455) HD/SD Switchable Video Filters and Buffers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX7455 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
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 PB PR 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 2VP-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 2VP-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**
MAX7454UUP+* 0°C to +85°C 20 TSSOP-EP**
MAX7455UUP* 0°C to +85°C 20 TSSOP-EP**
MAX7455UUP+* 0°C to +85°C 20 TSSOP-EP**
+Indicates lead-free packaging.
*Future product—contact factory for availability.
**EP = Exposed pad.
+6
+6
+12
+12
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
________________________________________________________________ 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.
1 page  
HD/SD Switchable Video Filters and Buffers
PIN
1, 3, 5, 7, 11,
12, 15, 18
2
4
6
8
9
10, 13, 16,
19
14
17
20
—
NAME
GND
IN1
IN2
IN3
SD/HD
FSEL
VCC
OUT3
OUT2
OUT1
EP
Pin Description
FUNCTION
Ground
Video Input 1
Video Input 2
Video Input 3
SD/HD Select. Selects between HD or SD magnitude response. Connect to GND to choose HD
bandwidth response.
Frequency Select. Selects either a low or high setting for both HD and SD frequency response (see
the Frequency Adjusting section).
+5V Power Supply. Bypass to GND with a 0.1µF capacitor. See the Power-Supply Bypassing and
Layout Considerations section.
Video Output 3
Video Output 2
Video Output 1
Exposed Pad. The exposed pad is internally connected to ground.
Detailed Description
The MAX7454/MAX7455 are ideal for use in consumer
electronic products such as HD-compatible cable-TV
set-top boxes or DBS receiver decoders, which process
video signals in component output format. The
MAX7454/MAX7455 support both the 1080i and the
720p scanning formats for HDTV as well as the 480i and
480p formats for SDi and SDp TV. The reconstruction fil-
ters take three signals out of a video digital-to-analog
converter (DAC) or an encoder and smooth the signals
with appropriate filtering. FSEL and SD/HD select the fil-
ter frequency response for SDp, SDi, and HDTV (see
Table 1). The outputs are connected directly to standard
150Ω video loads.
The Typical Operating Circuit illustrates the internal
structure of the MAX7454/MAX7455. The lowpass filter
attenuates the high-frequency contents of the input,
and the output amplifier drives a standard video load.
Filter
Filter response
The video filter features an elliptic-type response with a
steep transition band response to achieve a wider
passband response along with an excellent stopband
response. In addition, the filter has been optimized to
give a good time domain response with low overshoot.
The stopband offers 62dB (typ) of attenuation at
sampling frequencies of 27MHz and above for
SDTV and 55dB (typ) of stopband attenuation for
Table 1. Frequency Selection Control
MODE
HD Low
HD High
SD Low
SD High
SD/HD
GND
GND
VCC
VCC
FSEL
GND
VCC
GND
VCC
frequencies of 74MHz and above for HDTV (see the
Typical Operating Characteristics).
Frequency Adjusting
SD/HD selects the HD or SD mode. In HD or SD mode,
FSEL allows optimization of the passband or stopband
performance by adjusting the cutoff frequency. If pass-
band performance is the priority, set FSEL high for the
maximum passband performance with a small compro-
mise in stopband attenuation. If stopband performance
is more important, set FSEL low for the maximum stop-
band attenuation with a small compromise in passband.
Due to the steep transition band response, the
MAX7454/MAX7455 can be used in both progressive
scan and interlaced video signals. The stopband atten-
uation at 27MHz or higher is >62dB.
Output Buffer
The output buffer on the MAX7454/MAX7455 drives a
2VP-P signal into a 150Ω video load. It is intended to be
DC-coupled per the digital TV standard. No output AC-
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX7455.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX745 | Switch-Mode Lithium-Ion Battery-Charger |  Maxim Integrated |
| MAX7450 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| MAX7451 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| MAX7452 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |