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A4782 데이터시트 PDF




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부품번호 A4782 기능
기능 VIDEO FILTER DRIVER
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A4782 데이터시트, 핀배열, 회로
AiT Semiconductor Inc.
www.ait-ic.com
A4782
VIDEO FILTER DRIVER
SINGLE-CHANNEL, 5th ORDER, STANDARD DEFINITION
DESCRIPTION
FEATURES
The A4782 is a low-Voltage, single-channel video Operation Temperature Range: -40to 85
amplifier with integrated reconstruction filter and input Single channel 5th Order 8MHz (SD) Filters
clamps. Specially suited for standard definition video Transparent Input Clamping
signals, this device is ideal for a wide range of 6dB Output Driver Gain
television and set-top box applications.
Rail-to-Rail Output
A4782 offers 6dB Gain rail-to-rail output driver and 5th Input Voltage Range Includes Ground
order output reconstruction filter. It has 8MHz -3dB AC or DC Coupled Inputs / Outputs
bandwidth and 31.25V/μs slew rate. A4782 provides Operates from 3.3V to 5.5V Power Supply
improved image quality compared with passive LC ESD: pass 8kV HBM test
filters and discrete drivers solution.
Available in SC70-5 Package
A4782 can be DC-coupled or AC-coupled with input
APPLICATION
video signal, such as the output stage of DAC to
eliminate out-of-band noise. The output in A4782 can Cable and Satellite Set-Top Boxes
be configured as DC or AC-coupled output. It Video Amplifiers
operates over an ambient temperature range of -40Communications Devices
to +85.
Portable and Handheld Products
Personal Video Recorders
The A4782 is available in SC70-5 package.
Video on Demand, DVD Players
ORDERING INFORMATION
TYPICAL APPLICATION
Package Type
Part Number
SC70-5
Note
A4782C5R
C5
A4782C5VR
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
Suffix V means Halogen free Package
REV1.0
- MAY 2013 RELEASED -
-1-




A4782 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A4782
VIDEO FILTER DRIVER
SINGLE-CHANNEL, 5th ORDER, STANDARD DEFINITION
ELECTRICAL CHARACTERISTICS
At VCC=5V, RL=150Ω connected to GND, VIN=1Vpp, and CIN=0.1μF, all outputs AC coupled with 220μF,
referenced to 400kHz, unless otherwise noted
Parameter
Conditions
Min. Typ. Max. Unit
DC ELECTRICAL CHARACTERISTICS
+25
7 9.5
IQ VIN=0.5V
mA
-40 to +85
11
VOLS
VIN=0V, No Load
+25
-40 to +85
395 580
mV
670
Input Voltage VCLAMP
(VCLAMP)
IIN=-3.5mA
+25
-40 to +85
-180
-261
-90
mV
Clamp Charge Current
VIN=VCLAMP-100mV
+25
-6 -5.1
-40 to +85-6.6
mA
Clamp Discharge Current
VIN=500mV
+25
-40 to +85
0.6 3
μA
3.2
PSRR
DC
+25
-40 to +85
45
44
56
dB
Output Voltage High Swing
VIN=3V, RL=150Ω
connected to GND
+25
-40 to +85
4.6
4.55
4.8
V
AC ELECTRICAL CHARACTERISTICS
GAIN (AV)
RL=150Ω to GND
+25
5.6 6 6.4
dB
-40 to +855.4
6.5
BW (-0.1dB)
RL=150Ω to GND
+25
6 MHz
BW (-3dB)
RL=150Ω to GND
+25
8 MHz
Filter Response
fIN=27MHz
+25
48 dB
SLEW RATE
2V outputstep 80% to 20% +25
31.25
V/uS
Fall time
2V outputstep 80% to 20% +25
38.4 nS
Rise time
2V outputstep 80% to 20% +25
38.4 nS
D/DT
difference from 400KHz
to 6.5MHz
+25
31 nS
PAL DC coupled
+25
0.6
DG %
PAL AC coupled
+25
0.88
PAL DC coupled
+25
0.88
DP %
PAL AC coupled
+25
1.6
REV1.0
- MAY 2013 RELEASED -
-4-

4페이지










A4782 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A4782
VIDEO FILTER DRIVER
SINGLE-CHANNEL, 5th ORDER, STANDARD DEFINITION
Application Note
Functional Description
A4782 operates from a single 3.3V to 5V supply. In application, A4782 is a fully integrated solution for filtering
and buffering SDTV signals in front of video decoder or behind video encoder. For example, A4782 can
replace one passive LC filter and one amplifier driver at CVBS and S-video output side in set-top box and
DVD player, this solution can help you save PCB size and production cost, it also improves video signal
performance comparing with traditional design using discrete components.
A4782 features a DC-coupled input buffer, 5-pole low-pass filter to eliminate out-of-band noise of video
encoder, and a gain of +6dB in the output amplifier to drive 75Ω load. The AC or DC-coupled input buffer
eliminates sync crush, droop, and field tilt. The output of A4782 also can be DC-coupled or AC-coupled.
Input Considerations
Besides AC coupling, the A4782 inputs also can be DC-coupled. In DC coupling application, No input
coupling capacitors are needed because the amplitude of input video signal from DAC includes ground and
extends up to 1.4V, then A4782 can be directly connected to the output of a single-supply, current-output
DAC without any external bias network. Some time, if DAC’s output level exceeds the range of 0V to 1.4V, or
A4782 is driven by an unknown external source or a SCART switch which has its own clamping circuit; AC
coupling is needed in such applications.
Output Considerations
The A4782 outputs can be DC-coupled or AC-coupled. When 0V is input, the A4782 output voltage is 395mV
typically. In DC coupling design, one 75Ω resistor is used to connect A4782’s output pin with external load
directly, this serial back-termination resistor is used to match the impedance of the transmission line between
A4782 and external load to cancel the signal reflection.
The A4782 outputs can sink and source current allowing the device to be AC-coupled with external load, in
AC coupling, 220μF at least capacitor will be used in order to eliminate field tilt.
Power-Supply Bypassing and Layout
Correct power supply bypassing is very important for optimizing video performance in design. One 0.1μF and
one 10μF capacitors are always used to Bypass VCC pin of A4782, please place these two capacitors as close
to the A4782 output pin as possible, a large ground plane is also needed to ensure optimum performance.
The input and output termination resistors should be placed as close to the related pin of A4782 as possible to
avoid performance degradation. The PCB traces at the output side should have 75Ω characteristic impedance
in order to match the 75Ω characteristic impedance cable connecting external load. In design, please keep
the board trace at the inputs and outputs of the A4782 as short as possible to minimize the parasitic stray
capacitance and noise pickup.
REV1.0
- MAY 2013 RELEASED -
-7-

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A4781

VIDEO FILTER DRIVER

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A4782

VIDEO FILTER DRIVER

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