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19-3482; Rev 0; 10/04
KIT ATION EVALU LE B AVAILA
HD/SD Switchable Video Filters and Buffers
General Description
The MAX7454/MAX7455 triple-channel video reconstruction filters and buffers are ideal for high definition (HD), standard definition progressive scan/noninterlaced (SDp), and standard definition interlaced (SDi) television applications. These devices are a fully integrated 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 compatible 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-coupling 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.
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
MAX7454/MAX7455
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.
PART MAX7454UUP MAX7455UUP*
Ordering Information
TEMP RANGE PIN-PACKAGE BUFFER GAIN (dB) +6 +6 +12 +12
0°C to +85°C 20 TSSOP-EP** 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** +Indicates lead-free packaging. *Future product—contact factory for availability. **EP = Exposed pad.
Typical Operating Circuit
+5V VCC
MAX7454/MAX7455
ENCODER Y/R D/A IN1 SWITCHABLE LOWPASS FILTER +6dB OR +12dB OUT1 75Ω ZO = 75Ω 75Ω 2 D/A Pb/G IN2 SWITCHABLE LOWPASS FILTER +6dB OR +12dB OUT2 75Ω ZO = 75Ω 75Ω 2 D/A Pr/B IN3 SWITCHABLE LOWPASS FILTER +6dB OR +12dB OUT3 75Ω ZO = 75Ω 75Ω FSEL SD/HD GND
________________________________________________________________ Maxim Integrated Products
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HD/SD Switchable Video Filters and Buffers MAX7454/MAX7455
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V IN1, IN2, IN3 to GND..................................-0.3V to (VCC + 0.3V) OUT1, OUT2, OUT3 to GND ......................-0.3V to (VCC + 0.3V) SD/HD, FSEL to GND .................................-0.3V to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) 20-Pin TSSOP (derate 21.7mW/°C above +70°C) .....1739.1mW Maximum Current into IN1, IN2, IN3, SD/HD, FSEL .........±50mA Operating Temperature Range MAX745_UUP .....................................................0°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Junction Temperature ......................................................+150°C
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%, RLOAD = 150Ω to GND, CLOAD = 0 to 20pF to GND, SD/HD = GND, FSEL = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETERS HD-Filter Passband Response HD-Filter Stopband Attenuation SD-Filter Passband Response SD-Filter Stopband Attenuation HD Group Delay Deviation HD Group Delay Matching ∆tG tG(MATCH) SYMBOL APB ASB CONDITIONS f = 100kHz to 26MHz, FSEL = GND f = 100kHz to 26MHz, FSEL = VCC f = 100kHz to 30MHz, FSEL = VCC f = 74MHz, FSEL = GND f = 10MHz, SD/HD = VCC, FSEL = VCC f = 27MHz, SD/HD = VCC, FSEL = GND 100kHz to 26MHz, relative to 100kHz; FSEL = VCC Channel to channel, 100kHz to 2MHz; FSEL = VCC 100kHz to 5.75MHz, relative to 100kHz; SD/HD = VCC, FSEL = VCC 100kHz to 10MHz, relative to 100kHz; SD/HD = VCC, FSEL = VCC Channel to channel, 100kHz to 500kHz; FSEL = VCC Gain = +2V/V, VOUT = 2VP-P video signal 100kHz to 26MHz 5-step modulated staircase (Note 1) 5-step modulated staircase (Note 1) Output signal (2VP-P) to RMS noise (100kHz to 30MHz) Deviations in a line with an 18µs, 100 IRE bar (Note 2) MAX7454, THD > -30dB, fIN = 4.43MHz MAX7455, THD > -30dB, fIN = 4.43MHz MAX7454, VIN = 0.3V, FSEL = GND VDIST SD/HD = VCC SD/HD = GND 0 0 -0.25 -0.25 ±1 62 MIN -3.5 -2.6 -3.6 45 -0.65 50 TYP -2.5 -1.7 -2.3 55 -0.40 62 5 0.1 2 ns 12 2 -45 0.3 0.2 67 ±1 ±3 1.2 0.6 +0.25 +0.25 ±10 ns dB % Degrees dB mV V mV mV dB dB dB ns ns dB MAX UNITS
SD Group Delay Deviation
∆tG
SD Group Delay Matching Total Harmonic Distortion Differential Gain Differential Phase Signal-to-Noise Ratio Line Time Distortion Input Voltage Range Total Output DC Variation Field Time Distortion
tG(MATCH) THD dG dθ SNR HDIST
130 lines, 18µs, 100 IRE bars
2
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HD/SD Switchable Video Filters and Buffers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V ±5%, RLOAD = 150Ω to GND, CLOAD = 0 to 20pF to GND, SD/HD = GND, FSEL = VCC, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.)
PARAMETERS Input Leakage Current Input Capacitance Low-Frequency Gain Accuracy Low-Frequency Gain Matching Dynamic Output Swing Channel-to-Channel Isolation Power-Supply Rejection Ratio Supply Voltage Range Supply Current LOGIC INPUTS (SD/HD, FSEL) Input High Voltage Input Low Voltage Input Current VIH VIL Digital inputs = VCC or 0V 2.4 0.8 ±10 V V µA PSRR VCC ICC No load SYMBOL IIN CIN fIN = 100kHz fIN = 100kHz, maximum difference between any two input channels THD > -30dB DC to 1MHz VIN = 100mVP-P at 5MHz VIN =10mVP-P at 26MHz 4.75 2.4 70 35 25 5 220 5.25 235 -2.5 0 CONDITIONS MIN TYP ±10 5 +2.5 1.2 MAX UNITS nA pF % % VP-P dB dB V mA
MAX7454/MAX7455
Note 1: The differential gain and differential phase specifications apply to standard-definition composite video signals only. Note 2: This applies for an anti-aliasing filtering application using a 0.1µF input capacitor. This does not apply for a video reconstruction application, since there is no input-coupling capacitor.
Typical Operating Characteristics
(RLOAD = 150Ω to GND, VCC = +5V, and TA = +25°C.)
MAGNITUDE RESPONSE (PASSBAND PLUS STOPBAND)
MAX7454toc01
GROUP DELAY
90 80 70 DELAY (ns)
MAX7454 toc02
10 0 -10 RESPONSE (dB) -20 HDHI -30 -40 -50 -60 -70 -80 0.1 1 10 FREQUENCY (MHz) 100 SDLO HDLO SDHI
100
60 50 40 30 20 10 HDHI SDHI
1000
0 0.1 1 10 100 FREQUENCY (MHz)
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HD/SD Switchable Video Filters and Buffers MAX7454/MAX7455
Typical Operating Characteristics (continued)
(RLOAD = 150Ω to GND, VCC = +5V, and TA = +25°C.)
2T RESPONSE (1 IRE = 7.14mV)
MAX7454 toc03
MODULATED 12.5T RESPONSE (1 IRE = 7.14mV)
MAX7454 toc04
200mV/div
200mV/div
200mV/div
200mV/div
200ns/div
400ns/div
DIFFERENTIAL GAIN (%)
SUPPLY CURRENT vs. TEMPERATURE
MAX7454 toc05
DIFFERENTIAL GAIN
0.1 0 -0.1 -0.2 1 0.2 0.1 0 -0.1 -0.2 1 2 3 4 5 6 7 2 3 4 5 6 7
MAX7454 toc06
0.30 0.28 0.26 SUPPLY CURRENT (A) 0.24 0.22 0.20 0.18 0.16 0.14 0.12 0.10 -40 -15 10 35 60 HDLO SDLO HDHI
0.2
85
TEMPERATURE (°C)
4
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DIFFERENTIAL PHASE (deg)
DIFFERENTIAL PHASE
HD/SD Switchable Video Filters and Buffers
Pin Description
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 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. FUNCTION
MAX7454/MAX7455
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 filters 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 filter 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/M
