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MAX7451ESA+MAIXMN/a2500avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp
MAX7452ESA+N/AN/a2500avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp
MAX7450ESA+T |MAX7450ESATMAXN/a2500avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp
MAX7450ESA+TMAXIMN/a7165avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp
MAX7452ESA+ |MAX7452ESAMAXIMN/a350avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp
MAX7452ESA+T |MAX7452ESATMAXIMN/a7500avaiVideo-Signal Conditioners with AGC and Back-Porch Clamp


MAX7452ESA+T ,Video-Signal Conditioners with AGC and Back-Porch ClampFeaturesThe MAX7450/MAX7451/MAX7452 complete front-end♦ Back-Porch Clamp to GND (MAX7450/MAX7451)vi ..
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MAX7456EUI+ ,Single-Channel Monochrome On-Screen Display with Integrated EEPROMApplicationsMAX7456EUI+ 28 TSSOP-EP*JapaneseIn-Cabin Entertainment*EP = Exposed pad.Consumer Electr ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY


MAX7450ESA+T-MAX7451ESA+-MAX7452ESA+-MAX7452ESA+T
Video-Signal Conditioners with AGC and Back-Porch Clamp
General Description
The MAX7450/MAX7451/MAX7452 complete front-end
video-signal conditioners are designed to improve the
quality of standard-definition video signals. The devices
restore the DC level of the video input, correct for
amplitude errors up to ±6dB, detect fault conditions,
and filter out-of-band noise. The MAX7450/MAX7451/
MAX7452 optimize the signal quality for further video
processing through a crosspoint switch or video
decoder (ADC). Each device integrates an input video
clamp, automatic gain control (AGC), loss-of-sync
(LOS) detector, and an out-of-band noise/lowpass filter.
These devices also incorporate a user-selectable
buffer gain (0 or +6dB) and an AGC-disable function.
The MAX7450 and MAX7451 operate from dual power
supplies of ±5V or ±3.3V respectively, and they restore
the video blanking level to GND. The MAX7452 operates
from a single +5V supply and features a user-adjustable
clamp level.
The devices are available in an 8-pin SO package with
an exposed pad and are specified for operation over
the extended (-40°C to +85°C) temperature range.
Applications

Signal Conditioner for Standard-Definition
Video Inputs
Security Video Systems
Video-Switching Systems
Features
Back-Porch Clamp to GND (MAX7450/MAX7451)Adjustable Back-Porch Clamp (MAX7452)Automatic Gain Control (±6dB Range) Normalizes
Signals to Standard Video Level
Input Fault Detection with LOS OutputInherent 50Hz/60Hz Input Rejection of 60dBSingle-Supply Operation: MAX7452 (+5V)Out-of-Band Noise FilterOutput Buffer Drives Standard 150ΩVideo Load
with 0dB or +6dB Gain
Dual-Supply Operation
MAX7450 (±5V)
MAX7451 (±3.3V)
Tiny 8-Pin SO Package
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
Ordering Information

19-3267; Rev 2; 11/04
EVALUATION KIT
AVAILABLE
PART†TEMP RANGEPIN-
PACKAGE
SUPPLY
VOLTAGE (V)
MAX7450ESA
-40°C to +85°C8 SO-EP*±5
MAX7451ESA
-40°C to +85°C8 SO-EP*±3.3
MAX7452ESA
-40°C to +85°C8 SO-EP*+5
MAX7450
MAX7451
NOISE
FILTER
VCC
VSS
75Ω
75Ω
LOS
SYNC SEPARATOR
AND AMPLITUDE
DETECTORAGCDOUTVIDEO
INPUT
GND
±6dB0 OR +6dB
GAIN SET (0dB OR +6dB)
Functional Diagram

*EP = Exposed pad.Package code = S8E-12.
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VSUPPLY = ±5V ±5% (MAX7450), VSUPPLY = ±3.3V ±5% (MAX7451), VSUPPLY = +5V ±5% (MAX7452), RL=150Ωto GND, CL = 0 to
20pF, GSET = 1, AGCD = 1, TA = TMINto TMAX, unless otherwise noted. Typical values are at TA = +25°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.
VCCto GND
MAX7450/MAX7452...........................................................+6V
MAX7451...........................................................................+4V
VSSto GND
MAX7450.............................................................................-6V
MAX7451.............................................................................-4V
OUT
MAX7450/MAX7451..........................................-2.5V to +3.5V
MAX7452................................................-0.3V to (VCC+ 0.3V)
GSET, AGCD, LOS.....................................-0.3V to (VCC+ 0.3V)
All Other Pins
MAX7450/MAX7451...................(-0.3V + VSS) to (VCC+ 0.3V)
MAX7452................................................-0.3V to (VCC+ 0.3V)
Maximum Current into Any Pin............……………………±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 18.9mW/°C above +70°C)..............1509mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead temperature (soldering, 10s)..................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

MAX7450/MAX7451, relative to GND±50Clamp AccuracyMAX7452, relative VBPLVL = 1.5V±50mV
GSET = 01.52.4Back-Porch Level Input RangeVBPLVLMAX7452GSET = 11.22.0V
Clamp Response TimetCLAMPBlanking level at the output to 1% of final
value70Lines
GSET = 0, relative
to VOUT = 1VP-P±10
AGC AccuracyAGCD = 0,
VIN = 0.5VP-P to 2VP-PGSET = 1, relative
to VOUT = 2VP-P±10
AGC Input RangeAGCD = 0, relative to VIN = 1VP-P-6.0+6.0dB
Gain FlatnessGFf = 5MHz relative to 100kHz-0.3+0.3dB
Noise-Filter CutoffFc10MHz
GSET = 00.9511.05Low-Frequency Gainf = 100kHzGSET = 11.8522.05V/V
Group-Delay DeviationΔtG3.58/4.43MHz relative to 100kHz15ns
Differential GaindGFive-step modulated staircase (VIN = 1VP-P)0.20.6%
Differential PhasedθFive-step modulated staircase (VIN = 1VP-P)0.20.6Degrees
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
ELECTRICAL CHARACTERISTICS (continued)

(VSUPPLY = ±5V ±5% (MAX7450), VSUPPLY = ±3.3V ±5% (MAX7451), VSUPPLY = +5V ±5% (MAX7452), RL=150Ωto GND, CL = 0 to
20pF, GSET = 1, AGCD = 1, TA = TMINto TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

GSET = 0,
VOUT = 1VP-P68
Signal-to-Noise RatioSNR
Output signal
peak-to-peak to RMS
noise (100Hz to 5MHz)GSET = 1,
VOUT = 2VP-P65
Line Time DistortionHDIST18µs, 100 IRE bar0.2%
Field Time DistortionVDIST130 lines, 18µs, 100IRE bar0.5%
Input Leakage CurrentIIN15µA
Output Dynamic RangeVIN = 1VP-P, dG / dP < 3% / degrees22.4VP-P
AGCD = 130
Power-Supply Rejection RatioPSRRVCC + 100mVP-P,
f = 3.5MHzAGCD = 0 with
maximum gain20dB
MAX745035
MAX745130Supply Current
MAX745220
Logic-High InputVIH0.7 x
VCCV
Logic-Low InputVIL0.3 x
VCCV
Logic-High OutputVOHISOURCE = 500µAVCC -
0.5V
Logic-Low OutputVOLISINK = 500µA0.4V
Input Current Logic-HighIIHLogic input sink10µA
Input Current Logic-LowIILLogic input source10µA
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
Typical Operating Characteristics

VSUPPLY = ±5V ±5% (MAX7450), VSUPPLY = ±3.3V ±5% (MAX7451), VSUPPLY = +5V ±5% (MAX7452), RL= 150Ωto GND, CL = 0 to
20pF, GSET = 1, AGCD = 1. TA = +25°C, unless otherwise noted.
GROUP DELAY vs. FREQUENCY

MAX7450 toc01
FREQUENCY (MHz)
GROUP DELAY (ns)
2T RESPONSE
MAX7450 toc02
t = 200ns/div
200mV/div
OUT
200mV/div
DIFFERENTIAL GAIN

MAX7450 toc03
DIFFERENTIAL PHASE (DEGREES)
1st3rd2nd4th5th6th
DIFFERENTIAL GAIN (%)
DIFFERENTIAL PHASE
1st3rd2nd4th5th6th
PASSBAND AMPLITUDE vs. FREQUENCY

MAX7450 toc04
FREQUENCY (MHz)
AMPLITUDE (dB)
GAIN = 2V / V
GAIN = 1V / V
AMPLITUDE vs. FREQUENCY

MAX7450 toc05
FREQUENCY (MHz)
AMPLITUDE (dB)
GAIN = 1V / V
GAIN = 2V / V
SUPPLY CURRENT vs. TEMPERATURE

MAX7450 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (mA)3510-15
MAX7450
BACK-PORCH VOLTAGE
vs. TEMPERATURE

MAX7450 toc07
TEMPERATURE (°C)
BACK-PORCH VOLTAGE (mV)3510-15
MAX7450
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
PIN
MAX7450/
MAX7451MAX7452NAMEFUNCTION
VCCPositive Power Supply. Connect +5V to VCC for the MAX7450/MAX7452. Connect +3.3V to VCC
for the MAX7451. Bypass to GND with 1µF and 0.1µF capacitors as close to the pin as possible.2INVideo Input. AC-couple video signal through a 0.1µF capacitor.GNDGroundVSSNegative Power Supply. Connect -5V to VSS for the MAX7450. Connect -3.3V to VSS for the
MAX7451. Bypass to GND with 1µF and 0.1µF capacitors as close to the pin as possible.BPLVLBack-Porch Level Input. When gain = 2V/V (GSET = 1), output back-porch level is equal to
BPLVL input. When gain = 1V/V (GSET = 0), output back-porch level is equal to VBPLVL/1.5.AGCDAutomatic Gain-Control Disable Input. Disable AGC by driving AGCD to VCC. Enable AGC by
driving AGCD to GND.OUTVideo OutputGSETGain-Setting Input. Drive GSET high to set buffer gain to +6dB. Drive GSET low to set buffer
gain to 0dB.LOSLoss-of-Sync Logic Output. LOS is high when video sync is lost for more than 15 horizontal
lines. LOS goes low when video sync is present.—EPExposed Pad. Connect to VSS (MAX7450/MAX7451). Connect to GND (MAX7452).
Pin Description
OUTPUT BACK-PORCH LEVEL (MAX7450)

MAX7450 toc08
1μs
AC-COUPLED
200mV/div
OUT
200mV/divBACK-PORCH = 0V
AGC RESPONSE ENVELOPE (VIN = 0.5VP-P)

MAX7450 toc09
400ms/div
500mV/div
AGCD = 0
VOUT = 2VP-P
AGC RESPONSE ENVELOPE (VIN = 2VP-P)

MAX7450 toc10
400ms/div
500mV/div
AGCD = 0
VOUT = 2VP-P
Typical Operating Characteristics (continued)

VSUPPLY = ±5V ±5% (MAX7450), VSUPPLY = ±3.3V ±5% (MAX7451), VSUPPLY = +5V ±5% (MAX7452), RL= 150Ωto GND, CL = 0 to
20pF, GSET = 1, AGCD = 1. TA = +25°C, unless otherwise noted.
MAX7450/MAX7451/MAX7452
Video-Signal Conditioners with AGC
and Back-Porch Clamp
Detailed Description

As shown in Figure 1, the devices include a 2nd-order
lowpass filter intended to reject out-of-band noise. The
MAX7450/MAX7451 clamp the back-porch voltage to
ground, and the MAX7452 clamps to a user-supplied
reference voltage. These devices also include an auto-
matic gain control (AGC), which automatically adjusts
the gain to ensure the sync amplitude is normalized to
a standard video level; an AGC disable function; and
an output driver that drives a standard video load
(150Ω) with a full 2VP-P video signal (GSET = 1) or 1VP-
P video signal (GSET = 0).
The clamp and the AGC work concurrently. Interaction
between the two different control loops is eliminated by
the large difference in time constants. The time con-
stant of the clamp settles within 100 lines, while the
AGC loop is digitally stepped so that it settles between
1000–64,000 lines.
The AGC control works independently of the gain set-
ting of the output buffer. The overall gain is the multipli-
cation of the AGC gain and the output buffer gain. The
maximum overall gain is +12dB and the minimum gain
is -6dB.
Back-Porch Clamp

The MAX7450/MAX7451/MAX7452 feature a back-
porch clamp to set the output blanking level. The
devices sense the voltage during back porch and feed
back into a control system. The control system provides
the appropriate DC-level shift to clamp the output to
ground (MAX7450/MAX7451) or to a voltage set by
VBPLVL(MAX7452). This restores the DC level for fur-
ther video processing such as on-screen display (OSD)
insertion and analog-to-digital conversion. The back-
porch clamp to ground also eliminates the need for
large output-coupling capacitors that can introduce
unwanted line-time distortion (tilt) and cost. This can
also reduce board space. The feedback network and
the on-chip capacitors introduce a finite settling time
after power-up or after any dramatic shift in input volt-
age (see the Electrical Characteristics section).
Back-Porch Level Input (MAX7452)

The MAX7452 features an adjustable back-porch level
at the output as shown in Figure 1. VBPLVLsets the
back-porch clamp level. The back-porch clamp-output
level is defined by the following equations.
GSET = 1 (Gain = 2V / V), VBACKPORCHLEVEL= VBPLVL
GSET = 0 (Gain = 1V / V), VBACKPORCHLEVEL=
VBPLVL / 1.5
MAX7452
NOISE
FILTER
VCC
75Ω
75Ω
LOS
SYNC SEPARATOR
AND AMPLITUDE
DETECTOR
AGCDOUTVIDEO
INPUT
BPLVL
±6dB0 OR +6dB
GAIN SET (0dB OR +6dB)
GND
Figure1. MAX7452 Functional Diagram
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