ABCelectronique : portail d'information dans le domaine de l'électronique
 
 
Numéro de sérieADA4420-6
CategorieMultimedia => Video => Filters
DescriptionLow Cost 6-Channel HD/SD Video Filter
The ADA4420-6 is a low cost video reconstruction filter specifically designed for consumer applications. It consists of six independent sixth-order Butterworth filters/buffers, three for standard definition (Y/C or CVBS) and three for high definition component signals (YPbPr or RGB).

The ADA4420-6 operates from a single 5 V supply and has a low quiescent current of 32 mA, making it ideal for applications where power consumption is critical. A disable feature allows for further power conservation by reducing the supply current to less than 8 ?A typical when the device is not in use.
SociétéAnalog Devices
DatasheetTélécharger ADA4420-6 datasheet
 
 
  • Description courte
  • FEATURES

    Sixth-order filters Transparent input sync tip clamp -1 dB bandwidth of 26 MHz typical for HD rejection @ 75 MHz: 48 dB typical NTSC differential gain: 0.19% NTSC differential phase: 0.76° Rail-to-rail outputs Low quiescent current: 32 mA typical Disable feature Output dc offset

    APPLICATIONS
    Set-top boxes DVD players and recorders HDTVs Projectors Personal video recorders

    The is a low cost video reconstruction filter specifically designed for consumer applications. It consists of six independent sixth-order Butterworth filters/buffers, three for standard definition (Y/C or CVBS) and three for high definition component signals (YPbPr or RGB). The ADA4420-6 operates from a single 5 V supply and has a low quiescent current of 32 mA, making it ideal for applications where power consumption is critical. A disable feature allows for further power conservation by reducing the supply current to less than 8 A typical when the device is not in use.

    Each channel features a transparent sync tip clamp, allowing ac coupling of the inputs without requiring dc restoration. The output drivers on the ADA4420-6 have rail-to-rail output capabilities with 6 dB gain. A built-in offset 250 mV allows the outputs to be dc-coupled, eliminating the need for large coupling capacitors. Each output is capable of driving two 75 doubly terminated cables. The ADA4420-6 is available a 16-lead QSOP and operates in the extended industrial temperature range to +85°C.

    Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

    One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2008 Analog Devices, Inc. All rights reserved.

    Features.............................................................................................. 1 Applications....................................................................................... 1 General Description......................................................................... 1 Functional Block Diagram.............................................................. 1 Revision History............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 Thermal Resistance...................................................................... 4 Maximum Power Dissipation..................................................... 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics..............................................6 Test Circuits........................................................................................9 Applications Information.............................................................. 10 Overview..................................................................................... 10 Disable......................................................................................... 10 Input and Output Coupling...................................................... 10 Printed Circuit Board (PCB) Layout....................................... 10 Video Encoder Reconstruction Filter...................................... 10 Outline Dimensions....................................................................... 12 Ordering Guide.......................................................................... 12

    2.0 V p-p, 150 , dc-coupled inputs, ac-coupled outputs, unless otherwise noted. See Figure 17, Figure 18, and Figure 19 for the test circuits. Table 1.

    Parameter OVERALL PERFORMANCE DC Voltage Gain Input Voltage Range, All Inputs Output Voltage Range, All Outputs Linear Output Current per Channel Filter Input Bias Current SD CHANNEL DYNAMIC PERFORMANCE -1 dB Bandwidth -3 dB Bandwidth Out-of-Band Rejection Crosstalk Total Harmonic Distortion Signal-to-Noise Ratio Propagation Delay Group Delay Variation Differential Gain Differential Phase HD CHANNEL DYNAMIC PERFORMANCE -1 dB Bandwidth -3 dB Bandwidth Out-of-Band Rejection Crosstalk Total Harmonic Distortion Signal-to-Noise Ratio Propagation Delay Group Delay Variation DC CHARACTERISTICS Operating Voltage Quiescent Supply Current PSRR Output DC Offset DISABLE Assert Voltage DISABLE Assert Time DISABLE De-Assert Time DISABLE Input Bias Current Input-to-Output Isolation Test Conditions/Comments All channels Min 5.8 Typ 0.25 to Max 6.2 Unit mA A MHz ns % Degrees

    = 27 MHz = 1 MHz = 1 MHz, 1.4 V p-p, dc-coupled outputs = 100 kHz to 6 MHz, unweighted = 100 kHz to 5 MHz NTSC; ac-coupled inputs, dc-coupled outputs; see Figure 18 NTSC; ac-coupled inputs, dc-coupled outputs; see Figure 18

    = 75 MHz = 1 MHz = 10 MHz, 1.4 V p-p, dc-coupled outputs = 100 kHz to 30 MHz, unweighted = 100 kHz to 30 MHz

    Active, DIS = 1 Disabled, DIS 0 HD channel, referred to output SD channel, referred to output All channels