View ADA4420-6_4412519.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Low Cost 6-Channel HD/SD Video Filter ADA4420-6
FEATURES
Sixth-order filters Transparent input sync tip clamp -1 dB bandwidth of 26 MHz typical for HD 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
INSD1 CLAMP INSD2 CLAMP INSD3 OUTSD3 OUTSD2
FUNCTIONAL BLOCK DIAGRAM
x1 SD x2 OUTSD1
x1
SD
x2
x1 CLAMP
SD
x2
DIS
INHD1
APPLICATIONS
Set-top boxes DVD players and recorders HDTVs Projectors Personal video recorders
INHD2
x1 CLAMP
HD
x2
OUTHD1
x1 CLAMP
HD
x2
OUTHD2
INHD3 CLAMP
x1
HD
x2
OUTHD3
GENERAL DESCRIPTION
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.
Figure 1.
ADA4420-6
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 of 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 in a 16-lead QSOP and operates in the extended industrial temperature range of -40C to +85C.
Rev. 0
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 (c)2008 Analog Devices, Inc. All rights reserved.
07532-001
ADA4420-6 TABLE OF CONTENTS
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
REVISION HISTORY
8/08--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADA4420-6 SPECIFICATIONS
VS = 5 V, TA = 25C, VO = 2.0 V p-p, RL = 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 6.0 0 to 2.1 0.25 to 4.6 30 1 8.6 10 45 -68 0.02 70 57 16 0.19 0.76 Max 6.2 Unit dB V V mA A MHz MHz dB dB % dB ns ns % Degrees
f = 27 MHz f = 1 MHz f = 1 MHz, VO = 1.4 V p-p, dc-coupled outputs f = 100 kHz to 6 MHz, unweighted f = 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
8.5 42
f = 75 MHz f = 1 MHz f = 10 MHz, VO = 1.4 V p-p, dc-coupled outputs f = 100 kHz to 30 MHz, unweighted f = 100 kHz to 30 MHz
27 43
26 31 48 -68 0.57 66 15 11 4.75 to 5.25 32 7 41 45 250 20 450 -6.8 -96
MHz MHz dB dB % dB ns ns V mA A dB dB mV V ns ns A dB
Active, DIS = 1 Disabled, DIS = 0 HD channel, referred to output SD channel, referred to output All channels
36 13
35 40 135
375 1.9
Disabled, DIS = 0 Disabled, DIS = 0, f = 5 MHz
Rev. 0 | Page 3 of 12
ADA4420-6 ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Supply Voltage Power Dissipation Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Junction Temperature Rating 5.5 V See Figure 2 -65C to +125C -40C to +85C 300C 150C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
The power dissipated in the package (PD) is the sum of the quiescent power dissipation and the power dissipated in the package due to the load drive for all outputs. The quiescent power is the voltage between the supply pins (VS) times the quiescent current (IS). The power dissipated due to load drive depends on the particular application. For each output, the power due to load drive is calculated by multiplying the load current by the associated voltage drop across the device. The power dissipated due to the loads is equal to the sum of the power dissipations due to each individual load. RMS voltages and currents must be used in these calculations. Airflow increases heat dissipation, effectively reducing JA. Figure 2 shows the maximum power dissipation in the package vs. the ambient temperature for the 16-lead QSOP (105C/W) on a JEDEC standard 4-layer board. JA values are approximate.
2.0 1.8
MAXIMUM POWER DISSIPATION (W)
THERMAL RESISTANCE
JA is specified for the device soldered to a high thermal conductivity 4-layer (2s2p) circuit board, as described in EIA/JESD 51-7. Table 3.
Package Type 16-Lead QSOP JA 105 JC 23 Unit C/W
1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 10 20 30 40 50 60 70 80 90 100
07532-016
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation in the ADA4420-6 package is limited by the associated rise in junction temperature (TJ) on the die. At approximately 150C, which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this temperature limit can change the stresses that the package exerts on the die, permanently shifting the parametric performance of the ADA4420-6. Exceeding a junction temperature of 150C for an extended time can result in changes in the silicon devices, potentially causing failure.
0
AMBIENT TEMPERATURE (C)
Figure 2. Maximum Power Dissipation vs. Ambient Temperature for a 4-Layer Board
ESD CAUTION
Rev. 0 | Page 4 of 12
ADA4420-6 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
INSD1 INSD2 INSD3 VCC DIS INHD1 INHD2 INHD3
1 2 3 4 5 6 7 8 16 15 14
OUTSD1 OUTSD2 OUTSD3 GND GND OUTHD1 OUTHD2 OUTHD3
07532-002
ADA4420-6
TOP VIEW (Not to Scale)
13 12 11 10 9
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Mnemonic INSD1 INSD2 INSD3 VCC DIS INHD1 INHD2 INHD3 OUTHD3 OUTHD2 OUTHD1 GND GND OUTSD3 OUTSD2 OUTSD1 Description Standard Definition Input 1 Standard Definition Input 2 Standard Definition Input 3 Power Supply Disable/Power-Down Input High Definition Input 1 High Definition Input 2 High Definition Input 3 High Definition Output 3 High Definition Output 2 High Definition Output 1 Ground Ground Standard Definition Output 3 Standard Definition Output 2 Standard Definition Output 1
Rev. 0 | Page 5 of 12
ADA4420-6 TYPICAL PERFORMANCE CHARACTERISTICS
VS = 5.0 V, TA = 25C, VO = 2.0 V p-p, RL = 150 , dc-coupled inputs, ac-coupled outputs, unless otherwise noted. See Figure 17, Figure 18, and Figure 19 for the test circuits.
10 0 -10 -20 HD CHANNELS, RL = 75 HD CHANNELS, RL = 150
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 SD CHANNELS, RL = 150 HD CHANNELS, RL = 150 SD CHANNELS, RL = 75
HD CHANNELS, RL = 75
SD CHANNELS, RL = 75 SD CHANNELS, RL = 150
-30 -40 -50 -60 -70 1 10 FREQUENCY (MHz) 100
07532-004
FREQUENCY (MHz)
Figure 4. Frequency Response vs. Load (RL)
10 0 -10 -20
1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0
Figure 7. Flatness vs. Load (RL)
-30 -40 -50 -60 -70 -80 1 HD -40C HD +25C HD +85C SD -40C SD +25C SD +85C 10 FREQUENCY (MHz) 100
07532-005
NORMALIZED GAIN (dB)
GAIN (dB)
HD -40C HD +25C HD +85C SD -40C SD +25C SD +85C 1 10 FREQUENCY (MHz) 100
07532-008
07532-017
Figure 5. Frequency Response vs. Temperature
10 0 -10 -20
Figure 8. Flatness vs. Temperature
10 0 -10 -20
GAIN (dB)
HD DC-COUPLED
HD AC-COUPLED
GAIN (dB)
-30 -40 -50 -60 -70 -80 1 SD VO = 100mV p-p SD VO = 2.0V p-p HD VO = 100mV p-p HD VO = 2.0V p-p
07532-006
-30 -40 -50 -60 SD AC-COUPLED -70 -80 1 10 FREQUENCY (MHz) SD DC-COUPLED 100
10 FREQUENCY (MHz)
100
Figure 6. Frequency Response vs. Amplitude
Figure 9. Frequency Response vs. Output Coupling
Rev. 0 | Page 6 of 12
07532-007
-80
NORMALIZED GAIN (dB)
GAIN (dB)
1
10
100
ADA4420-6
100 90 80
GROUP DELAY (ns)
6 5 SD CHANNELS
DISABLE VOLTAGE (V)
70 60 50 40 30 20 10 1 10 FREQUENCY (MHz) 100
07532-009
4 3 2 1 0 -1 -600
SD CHANNELS
HD CHANNELS
HD CHANNELS
TIME (ns)
Figure 10. Group Delay vs. Frequency
10k 36 35 34 33 32 31 30 29 10 0.1 28 -60
Figure 12. Enable Turn-On Time
DIS = 0
OUTPUT IMPEDANCE ()
1k
100
SUPPLY CURRENT (mA)
07532-011
1
10 FREQUENCY (MHz)
100
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
Figure 11. Output Impedance vs. Frequency
Figure 13. Supply Current vs. Temperature
Rev. 0 | Page 7 of 12
07532-013
07532-012
0 0.1
-400
-200
0
200
400
600
800
1000
1200
ADA4420-6
0 -10 -20
CROSSTALK (dB)
4.70 4.68
OUTPUT SATURATION VOLTAGE (V)
4.66 4.64 4.62 4.60 4.58 4.56 4.54 4.52
-30 -40 -50 -60 -70 -80 -90 0.1 HD CHANNELS SD CHANNELS
1
10 FREQUENCY (MHz)
100
1000
07532-014
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
Figure 14. Crosstalk vs. Frequency
6 5 4 3 2 1 0 -1 -200 -160 -120 SD CHANNELS
Figure 16. Output Saturation Voltage vs. Temperature
DISABLE VOLTAGE (V)
HD CHANNELS
-80
-40
0
40
80
120
160
200
TIME (ns)
Figure 15. Disable Turn-Off Time
07532-015
Rev. 0 | Page 8 of 12
07532-010
4.50 -60
ADA4420-6 TEST CIRCUITS
AGILENT E3631A POWER SUPPLY
+6V + - + 25V COM -
VCC
(SEE FIGURE 17)
TEST CIRCUIT
ADA4420-6
VCC
GND DISABLE
0.1F
10F
VIN
VOUT
50
VIN 49.9 220F
PORT 1
VOUT
PORT 2
ADA4420-6
118 86.6
BIAS CONNECT PORT 1
07532-018
DISABLE
GND
AGILENT 8753D VECTOR NETWORK ANALYZER
Figure 17. DC-Coupled Input, AC-Coupled Output
VCC
Figure 19. Test Circuit for Frequency Response and Group Delay
0.1F
10F
VIN 49.9
0.1F
ADA4420-6
118 86.6
VOUT
DISABLE
GND
Figure 18. AC-Coupled Input, DC-Coupled Output
Rev. 0 | Page 9 of 12
07532-019
07532-020
ADA4420-6 APPLICATIONS INFORMATION
OVERVIEW
With its high impedance inputs and high output drive, the ADA4420-6 is ideally suited to video reconstruction and antialias filtering applications. The high impedance inputs give designers flexibility with regard to how the input signals are terminated. Devices with DAC current source outputs that feed the ADA4420-6 can be loaded in whatever resistance provides the best performance, and devices with voltage outputs can be optimally terminated as well. The ADA4420-6 outputs can each drive up to two source-terminated, 75 loads and, therefore, can directly drive the outputs from set-top boxes and DVDs without the need for a separate output buffer.
ADA4420-6
75 220F 75 CABLE 75 75 220F 75 CABLE 75
Figure 20. Driving Two AC-Coupled Loads with Two Coupling Capacitors
ADA4420-6
470F
75
75 CABLE 75
75
75 CABLE 75
DISABLE
The ADA4420-6 includes a disable feature that can be used to save power when a particular device is not in use. When disabled, the ADA4420-6 typically draws only 7 A from the supply. The disable feature is asserted by pulling the DIS pin low. Table 5 summarizes the operation of the disable feature. Table 5. Disable Function
DIS Pin Connection VCC or floating GND Status Enabled Disabled
Figure 21. Driving Two AC-Coupled Loads with One Common Coupling Capacitor
07532-023
PRINTED CIRCUIT BOARD (PCB) LAYOUT
As with all high speed applications, attention to the PCB layout is of paramount importance. When designing with the ADA4420-6, adhere to standard high speed layout practices. A solid ground plane is recommended, and surface-mount, ceramic power supply decoupling capacitors should be placed as close as possible to the supply pins. Connect all of the ADA4420-6 GND pins to the ground plane with traces that are as short as possible. Controlled impedance traces of the shortest length possible should be used to connect to the signal I/O pins and should not pass over any voids in the ground plane. A 75 impedance level is typically used in video applications. When driving transmission lines, include series termination resistors on the signal outputs of the ADA4420-6. When the ADA4420-6 receives its inputs from a device with current outputs, the required load resistor value for the output current is often different from the characteristic impedance of the signal traces. In this case, if the interconnections are short (<< 0.1 wavelength), the trace does not have to be terminated in its characteristic impedance. Traces of 75 can be used in this instance, provided their lengths are an inch or two at most. This is easily achieved because the ADA4420-6 and the device feeding it are usually adjacent to each other, and connections can be made that are less than one inch in length.
INPUT AND OUTPUT COUPLING
Inputs to the ADA4420-6 can be ac- or dc-coupled. For dc-coupled inputs, the signal must be completely contained within the input range of 0 V to 2.1 V. When using ac-coupled inputs, the lowest point of the signal is clamped to approximately 0 V. The ADA4420-6 outputs can be either ac- or dc-coupled. When driving single ac-coupled loads in standard 75 video distribution systems, a minimum capacitance of 220 F is recommended to avoid line and field droop. There are two ac coupling options when driving two loads from one output. One option simply uses the same value capacitor on the second load, while the other option uses a common coupling capacitor that is at least twice the value used for the single load (see Figure 20 and Figure 21). When driving two parallel 150 loads (75 effective load), the 3 dB bandwidth of the filters typically varies from that of the filters with a single 150 load (see Figure 4).
VIDEO ENCODER RECONSTRUCTION FILTER
The ADA4420-6 is easily applied as a reconstruction filter at the DAC outputs of a video encoder. Figure 22 illustrates how to use the ADA4420-6 in this type of application following an ADV734x series video encoder, with a single-supply and ac-coupled outputs.
Rev. 0 | Page 10 of 12
07532-022
ADA4420-6
ADV734x
INHD1 300 INHD2 300 INHD3 300 DIS INSD1 300 INSD2 300 S-VIDEO DAC 6 RSET1 RSET2 4.12k 300
07532-021
MULTIFORMAT VIDEO ENCODER
+
DAC 1
x1
HD
x2
OUTHD1
220F 75
Y
DAC 2
x1
HD
x2
DAC 3
x1
HD
x2
ADA4420-6
x1 SD x2
+
DAC 4
OUTSD1
+
OUTHD3
+
OUTHD2
220F 75
Pb
220F 75
Pr
220F 75
CVBS
DAC 5
x1
SD
x2
x1
SD
x2
4.12k
Figure 22. The ADA4420-6 Applied as a Reconstruction Filter Following an ADV734x Series Video Encoder
Rev. 0 | Page 11 of 12
+
INSD3
OUTSD3
+
OUTSD2
220F 75
220F 75
ADA4420-6 OUTLINE DIMENSIONS
0.197 (5.00) 0.193 (4.90) 0.189 (4.80)
16
9
1
0.158 (4.01) 0.154 (3.91) 0.150 (3.81)
8
0.244 (6.20) 0.236 (5.99) 0.228 (5.79)
0.065 (1.65) 0.049 (1.25) 0.010 (0.25) 0.004 (0.10) COPLANARITY 0.004 (0.10)
0.069 (1.75) 0.053 (1.35) SEATING PLANE 0.012 (0.30) 0.008 (0.20) 8 0
0.010 (0.25) 0.006 (0.15)
0.020 (0.51) 0.010 (0.25)
0.025 (0.64) BSC
0.050 (1.27) 0.016 (0.41)
0.041 (1.04) REF
COMPLIANT TO JEDEC STANDARDS MO-137-AB CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
012808-A
Figure 23. 16-Lead Shrink Small Outline Package [QSOP] (RQ-16) Dimensions shown in inches and (millimeters)
ORDERING GUIDE
Model ADA4420-6ARQZ 1 ADA4420-6ARQZ-R71 ADA4420-6ARQZ-RL1
1
Temperature Range -40C to +85C -40C to +85C -40C to +85C
Package Description 16-Lead Shrink Small Outline Package (QSOP) 16-Lead Shrink Small Outline Package (QSOP) 16-Lead Shrink Small Outline Package (QSOP)
Package Option RQ-16 RQ-16 RQ-16
Ordering Quantity 1 1,000 1,500
Z = RoHS Compliant Part.
(c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07532-0-8/08(0)
Rev. 0 | Page 12 of 12

▲Up To Search▲

Price & Availability of ADA4420-6

	To Download ADA4420-6 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .