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19-3790; Rev 0; 8/05
Single-Channel Video Reconstruction Filters and Buffers
General Description
The MAX7462/MAX7463 single-channel, standard-definition, integrated video reconstruction filters and buffers are ideal for anti-aliasing and digital-to-analog smoothing video applications or wherever analog video is reconstructed from digital data (such as cable/satellite/terrestrial set-top boxes and DVRs). The MAX7462 includes a disable function, which places the output in a high-impedance state allowing multiplexing of multiple output signals. It also has an external gain control that sets the output buffer gain to either +6dB or +9.5dB. The higher gain setting allows a lower DAC output signal than the standard 1VP-P signal. The MAX7463 output buffer has a fixed gain of +6dB. The MAX7462/MAX7463 operate from a single +5V supply and have a flat passband out to 5MHz with a stopband attenuation of -43dB (typ) at 27MHz. These devices can drive two standard 150 AC-coupled or DC-coupled video loads. The output black level of the MAX7462/MAX7463 is less than 1V for DC-coupled outputs. The MAX7462 is available in an 8-pin MAX(R) package and an 8-pin SO package. The MAX7463 is available in an 8-pin SO package. All devices are specified over the 0C to +85C temperature range.
Features
Standard-Definition CVBS Video Reconstruction Filters and Buffers Passband: -0.05dB at 5MHz Stopband: -43dB at 27MHz Selectable Gain: +6dB and +9.5dB (MAX7462) Output Disable (MAX7462) Drives 2VP-P into Two 150 Video Loads Output Black Level < 1V for DC-Coupled Output Very Small MAX and SO Packages
MAX7462/MAX7463
Ordering Information
PART MAX7462UUA* MAX7462USA* MAX7463USA PINPACKAGE 8 MAX 8 SO 8 SO BUFFER GAIN (dB) +6/+9.5 selectable +6/+9.5 selectable +6 fixed OUTPUT DISABLE Yes Yes No
Applications
Cable/Satellite/Terrestrial Set-Top Boxes DVRs Hard-Disk Recorders
Note: All parts are specified over the 0C to +85C temperature range. *Future product--contact factory for availability. Pin Configurations appear at end of data sheet.
Functional Diagram
+5V
VCC
MAX7462
75
* 220F
ZO = 75
0.1F DAC
IN
LOWPASS FILTER
+6dB/+9.5dB
OUT
75
75
* 220F
ZO = 75
GND GAIN *OPTIONAL DISABLE
75
Max is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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.
Single-Channel Video Reconstruction Filters and Buffers MAX7462/MAX7463
ABSOLUTE MAXIMUM RATINGS
VCC to GND ........................................................................+6.0V All Other Pins to GND ...-0.3V to the lower of (VCC + 0.3V) and +6V Maximum Current into Any Pin Except VCC and GND .....50mA Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 4.5mW/C above +70C) ......... 362mW 8-Pin SO (derate 5.9mW/C above +70C) .......... 470.6mW Operating Temperature Range...............................0C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +5V 5%, CL = 0 to 20pF, RL = 75, CIN = 0.1F, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25C.)
PARAMETER Passband Response Stopband Attenuation Output Dynamic Swing Output Sync Tip Clamp Level Group Delay Deviation Differential Gain Differential Phase Signal-to-Noise Ratio Low-Frequency Gain Accuracy Line Time Distortion Field Time Distortion Power-Supply Rejection Ratio Supply Current f 27MHz Gain = GND (MAX7462) After termination (Note 1) f = 100kHz to 4.2MHz Five-step modulated staircase Five-step modulated staircase Output signal (2VP-P) to RMS noise (100Hz to 5MHz) f =100kHz, relative to a gain of +6dB 18s, 100 IRE bar 130 lines, 18s, 100 IRE bar VIN = 100mVP-P, f = 100kHz No load -3 0.1 0.1 35 25 35 0.30 CONDITIONS f = 100kHz to 5MHz, relative to 100kHz MIN -0.65 39 TYP -0.05 43 2.0 0.45 11 0.15 0.15 75 +3 2.4 0.55 MAX +0.65 UNITS dB dB VP-P V ns % Degrees dB % % % dB mA
Note 1: Measured after 75 back-match resistor. Assume a 75 termination resistor.
2
_______________________________________________________________________________________
Single-Channel Video Reconstruction Filters and Buffers
Typical Operating Characteristics
(VCC = +5V 5%, CL = 0 to 20pF, RL = 75, CIN = 0.1F, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25C.) PASSBAND AMPLITUDE vs. FREQUENCY AMPLITUDE vs. FREQUENCY
0
MAX7462/63 toc01
MAX7462/MAX7463
1.5 1.0 AMPLITUDE (dB) 0.5 0 -0.5 -1.0 -1.5
AMPLITUDE (dB)
-20
-40
-60 NORMALIZED TO 0dB -80 0.1 1 10 100 FREQUENCY (MHz)
NORMALIZED TO 0dB -2.0 0.1 1 FREQUENCY (MHz) 10
PHASE RESPONSE vs. FREQUENCY
MAX7462/63 toc03
GROUP DELAY vs. FREQUENCY
MAX7462/63 toc04
200 150 100 PHASE (DEGREES) 50 0 -50 -100
100
90 GROUP DELAY (ns)
80
70
60 -150 -200 0.1 1 FREQUENCY (MHz) 10 50 0.1 1 FREQUENCY (MHz) 10
2T RESPONSE
MAX7462/63 toc05
MODULATED 12.5T RESPONSE
MAX7462/63 toc06
OUT 250mV/div
IN 250mV/div
200ns/div
200ns/div
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MAX7462/63 toc02
2.0
OUT 250mV/div
IN 250mV/div
3
Single-Channel Video Reconstruction Filters and Buffers MAX7462/MAX7463
Typical Operating Characteristics (continued)
(VCC = +5V 5%, CL = 0 to 20pF, RL = 75, CIN = 0.1F, gain = +6dB, DISABLE = VCC (MAX7462), TA =TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, and TA = +25C.)
SUPPLY CURRENT vs. TEMPERATURE
MAX7462/63 toc07
DIFFERENTIAL GAIN
DIFFERENTIAL GAIN (%) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 1 2 3 4 5 6 7 2 3 4 5 6 7
MAX7462/63 toc08
40 VIN = +2V NO LOAD SUPPLY CURRENT (mA)
30
20
10 0 17 34 51 68 85 TEMPERATURE (C)
DIFFERENTIAL PHASE (deg)
DIFFERENTIAL PHASE
MULTIBURST RESPONSE
MAX7462/63 toc09
OUT RESPONSE TO A FIELD SQUARE WAVE
MAX7462/63 toc10
OUT 250mV/div
OUT 500mV/div
IN 250mV/div
IN 500mV/div
10s/div
2ms/div
DISABLE TURN-ON TIME
MAX7462/63 toc11
DISABLE TURN-OFF TIME
MAX7462/63 toc12
OUT 1V/div
OUT 1V/div
GND
GND
DISABLE 2V/div GND 100ns/div
DISABLE 2V/div GND
100ns/div
4
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Single-Channel Video Reconstruction Filters and Buffers
Pin Description
PIN MAX7462 1 2 3, 4, 5 -- 6 7 8 MAX7463 1 -- 3 2, 4, 5, 6 -- 7 8 NAME IN GAIN GND N.C. DISABLE VCC OUT FUNCTION Video Input. AC-couple IN with a series 0.1F capacitor. Gain Control Input. Connect GAIN to GND for a gain of +6dB (+2V/V). Connect GAIN to VCC for a gain of +9.5dB (+3V/V). Ground No Connection. Not internally connected. Connect to GND for better performance. Disable Input. Connect to VCC to enable the output buffer (normal operation). Connect to GND to put the output buffer in a high-impedance state. +5V Supply Input Buffer Output. This output can be either AC- or DC-coupled. Use at minimum a 220F capacitor for AC-coupled loads.
MAX7462/MAX7463
Detailed Description
The MAX7462/MAX7463 filters and buffers the analog CVBS video outputs of DAC video-encoders in applications such as set-top boxes, hard-disk recorders, DVD players, and digital VCRs. The MAX7462/MAX7463 consist of a lowpass filter and an output video buffer that can drive two standard 150 video loads. These devices operate from a single +5V supply and have a bandwidth optimized for interlaced NTSC, PAL, and SDTV.
capacitor. The output buffer can drive DC loads while maintaining an output blanking level of less than 1V. The blanking level allows the MAX7462/MAX7463 to meet the digital TV interface specifications for DC coupling.
Applications Information
Input Considerations
Use a 0.1F ceramic capacitor to AC-couple the input. The input capacitor stores a DC voltage so that the output is clamped to the appropriate DC voltage level.
Filter
The reconstruction filter is a 4th-order Butterworth-type response that features a maximally flat passband for NTSC and PAL bandwidths. The stopband attenuation is optimized for a video-encoder DAC sampling frequency of 27MHz (see the Typical Operating Characteristics).
Output Considerations
The outputs are typically connected to a 75 series back-match resistor followed by the video cable. Because of the inherent divide-by-two of this configuration, the blanking level on the video cable is always less than 1V, complying with industry-standard video requirements such as the digital TV standard (which allows up to 1VDC on the video cable) and the European SCART standard (which allows up to 2VDC on the video cable). The video buffer can also drive an AC-coupled video load. Good video performance is achieved with an output capacitor as low as 220F.
Output Buffer
The output buffer can drive two 150 video loads with a 2VP-P signal. For the MAX7462, the output buffer gain is selectable between +6dB and +9.5dB by using GAIN (see Table 1). The MAX7463 has a fixed gain of +6dB. The MAX7462/MAX7463 can drive an AC load or drive the video load directly without using a large output
Power-Supply Bypassing and Layout
The MAX7462/MAX7463 operate from a single +5V supply. Bypass VCC to GND with a 0.1F capacitor. In addition, it is sometimes advantageous to connect a 10F capacitor within the general vicinity of the video circuitry. Place all other external components as close to the device as possible.
Table 1. Gain Setting Control (MAX7462)
GAIN GND VCC BUFFER GAIN (dB) +6 +9.5
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5
Single-Channel Video Reconstruction Filters and Buffers MAX7462/MAX7463
Pin Configurations
PROCESS: BiCMOS
TOP VIEW
Chip Information
IN 1 GAIN 2
8 7
OUT VCC DISABLE GND
MAX7462
GND 3 6 5 GND 4
IN 1 N.C. 2
8 7
OUT VCC N.C. N.C.
MAX7463
GND 3 6 5 N.C. 4
6
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Single-Channel Video Reconstruction Filters and Buffers
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
8LUMAXD.EPS
MAX7462/MAX7463
8
4X S
8
INCHES DIM A A1 A2 b c D e E H MIN 0.002 0.030 MAX 0.043 0.006 0.037
MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95
O0.500.1
E
H
0.60.1
1
0.60.1
1
D
L
S
BOTTOM VIEW
0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC
0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC
TOP VIEW
A2
A1
A
e
c b L
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL DOCUMENT CONTROL NO. REV.
21-0036
J
1 1
_______________________________________________________________________________________
7
Single-Channel Video Reconstruction Filters and Buffers MAX7462/MAX7463
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Boblet
SOICN .EPS

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