|
|
PDF MAX7451 Data sheet ( Hoja de datos )
| Número de pieza | MAX7451 | |
| Descripción | (MAX7450 - MAX7452) Video-Signal Conditioners | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX7451 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
19-3267; Rev 2; 11/04
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
VCC
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 Output
♦ Inherent 50Hz/60Hz Input Rejection of 60dB
♦ Single-Supply Operation: MAX7452 (+5V)
♦ Out-of-Band Noise Filter
♦ Output Buffer Drives Standard 150Ω Video Load
with 0dB or +6dB Gain
♦ Dual-Supply Operation
MAX7450 (±5V)
MAX7451 (±3.3V)
♦ Tiny 8-Pin SO Package
Ordering Information
PART†
TEMP RANGE
PIN-
PACKAGE
SUPPLY
VOLTAGE (V)
MAX7450ESA
MAX7451ESA
MAX7452ESA
-40°C to +85°C 8 SO-EP*
-40°C to +85°C 8 SO-EP*
-40°C to +85°C 8 SO-EP*
±5
±3.3
+5
*EP = Exposed pad.
†Package code = S8E-12.
Functional Diagram
GAIN SET (0dB OR +6dB)
VIDEO
INPUT
IN
NOISE
FILTER
±6dB
0 OR +6dB
OUT 75Ω
SYNC SEPARATOR
AND AMPLITUDE
DETECTOR
LOS
AGCD
75Ω
MAX7450
MAX7451
VSS GND
________________________________________________________________ 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.
1 page  
Video-Signal Conditioners with AGC and
Back-Porch Clamp
Typical Operating Characteristics (continued)
VSUPPLY = ±5V ±5% (MAX7450), VSUPPLY = ±3.3V ±5% (MAX7451), VSUPPLY = +5V ±5% (MAX7452), RL= 150Ω to GND, CL = 0 to
20pF, GSET = 1, AGCD = 1. TA = +25°C, unless otherwise noted.
OUTPUT BACK-PORCH LEVEL (MAX7450)
MAX7450 toc08
AGC RESPONSE ENVELOPE (VIN = 0.5VP-P)
MAX7450 toc09
AGCD = 0
VOUT = 2VP-P
AGC RESPONSE ENVELOPE (VIN = 2VP-P)
MAX7450 toc10
AGCD = 0
VOUT = 2VP-P
IN
AC-COUPLED
200mV/div
OUT
200mV/div
BACK-PORCH = 0V
500mV/div
500mV/div
1µs
400ms/div
400ms/div
Pin Description
PIN
MAX7450/
MAX7451
MAX7452
NAME
FUNCTION
1
1
VCC
Positive 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.
2 2 IN Video Input. AC-couple video signal through a 0.1µF capacitor.
3 3 GND Ground
4
—
VSS
Negative 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.
—
4
BPLVL
Back-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.
5 5 AGCD Automatic Gain-Control Disable Input. Disable AGC by driving AGCD to VCC. Enable AGC by
driving AGCD to GND.
6 6 OUT Video Output
7 7 GSET Gain-Setting Input. Drive GSET high to set buffer gain to +6dB. Drive GSET low to set buffer
gain to 0dB.
8 8 LOS Loss-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.
— — EP Exposed Pad. Connect to VSS (MAX7450/MAX7451). Connect to GND (MAX7452).
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX7451.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX745 | Switch-Mode Lithium-Ion Battery-Charger |  Maxim Integrated |
| MAX7450 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| MAX7451 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| MAX7452 | (MAX7450 - MAX7452) Video-Signal Conditioners | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |