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PDF NCS2566 Data sheet ( Hoja de datos )
| Número de pieza | NCS2566 | |
| Descripción | 6-Channel Video Amplifier | |
| Fabricantes | ON Semiconductor | |
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NCS2566
Six-Channel Video Driver
with Triple SD & Triple
Selectablewww.datasheet4u.com SD/HD Filters
The NCS2566 integrates reconstruction filters and video amplifiers.
It’s a combination of two 3−channel drivers − the first one capable to
deal with Standard Definition (SD) video signals and a second one
including selectable filters for either Standard or High Definition
(HD) video applications. The filters implemented are 6th order
Butterworth Low Pass filters particularly effective for rejecting
unwanted high frequency components and assuring good linearity of
the phase change over frequency with well optimized group delays.
All channels can accept DC− or AC−coupled signals; when AC−
coupled the internal clamps are employed. The outputs can drive both
AC− and DC−coupled 150 W loads.
It is designed to be compatible with most Digital−to−Analog
Converters (DAC) embedded in video processors. To further reduce
power consumption, two enable pins are provided, one for each triple
driver. One pin allows selection of the filter frequency of the SD/HD
triple driver.
Features
• 3−Channel with Selectable 6th−Order 8/34 MHz Butterworth Filters
• 3−Channel with Fixed 6th−Order 8 MHz Butterworth Filters
• Transparent Input Clamp for Each Channel
• Integrated Level Shifter
• AC− or DC−Coupled Inputs and Outputs
• Low Quiescent Current
• Shutdown Current 42 mA Typical (Disabled)
• 5 V Power Supply
• Each Channel Capable to Drive 2 by 150 W Load
• Internal Gain: 6dB $0.2
• Wide Input Common Mode Range
• ESD Human Body Model (HBM) Jedec Protection at the Outputs > 4 kV
• Operating Temperature Range: −40°C to +85°C
• Available in a TSSOP−20 Package
• These are Pb−Free Devices
Typical Applications
• Set−Top Box
• DVD players and related
• HDTV
http://onsemi.com
TSSOP−20
DTB SUFFIX
CASE 948E
MARKING DIAGRAM
20
NCS
2566
ALYWG
G
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
SD IN1 1
SD IN2 2
20 SD OUT1
19 SD OUT2
SD IN3 3
SD EN 4
VCC 5
SD/HD 6
18 SD OUT3
17 GND
16 GND
15 SD/HD EN
SD/HD IN1
SD/HD IN2
SD/HD IN3
7
8
9
14 SD/HD OUT1
13 SD/HD OUT2
12 SD/HD OUT3
NC 10
11 NC
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
March, 2009 − Rev. 0
1
Publication Order Number:
NCS2566/D
1 page  
NCS2566
DC ELECTRICAL CHARACTERISTICS (VCC = +5.0 V, Rsource = 37.5 W, TA = 25°C, inputs AC−coupled with 0.1 µF, all outputs
AC−coupled with 220 µF into 150 W referenced to 400 kHz; unless otherwise specified)
Symbol
Characteristics
Conditions
Min Typ Max Unit
POWER SUPPLY
VCC Supply Voltage Range
ICC Supply Current
www.datasheet4u.com
4.7 5.0 5.3
V
3 SD Channels Active
3 HD Channels Active
3 SD + 3 SD Channels Active
3 SD + 3 HD Channels Active
25 mA
40
50
65 80
ISD Shutdown Current
DC PERFORMANCE
No Channel Active
42 80 mA
Vi Input Common Mode Voltage Range
VIL SD/HD Input Low Level
VIH SD/HD Input High Level
Rpd Pulldown Resistors on Pins SD_EN and SD/HD_EN
OUTPUT CHARACTERISTICS
GND
0
1.4 VPP
0.8 V
2.4
VCC
V
250 kW
VOH Output Voltage High Level
VOL Output Voltage Low Level
IO Output Current
2.8 V
200 mV
40 mA
AC ELECTRICAL CHARACTERISTICS FOR STANDARD DEFINITION CHANNELS (Pin Numbers (1, 20) (2, 19), (3, 18),
(7, 14), (8, 13) & (9, 12)) (VCC = +5.0 V, Vin = 1 VPP, Rsource = 37.5 W, TA = 25°C, Inputs AC−coupled with 0.1 mF, All Outputs
AC−coupled with 220 mF into 150 W Referenced to 400 kHz; unless otherwise specified, SD/HD = Low)
Symbol
Characteristics
Conditions
Min Typ Max Unit
AVSD
BWSD
Voltage Gain
Low Pass Filter Bandwidth (Note 6)
Vin = 1 V − All SD Channels 5.8 6.0 6.2
dB
−1 dB
−3 dB
5.5 7.2
6.5 8.0
MHz
ARSD
dGSD
dFSD
THD
XSD
SNRSD
Stop−Band Attenuation (Note 7)
Differential Gain Error
Differential Phase Error
Total Harmonic Distortion
Channel−to−Channel Crosstalk
Signal−to−Noise Ratio
@ 27 MHz
43
Vout = 1.4 VPP @ 3.58 MHz
@ 1 MHz & Vin = 1.4 VPP
NTC−7 test signal, 100 kHz to
4.2 MHz (Note 5)
50
0.7
0.7
0.35
−58
72
dB
%
°
%
dB
dB
DtSD
Propagation Delay
@ 4.5 MHz
DGDSD Group Delay variation
100 kHz to 8 MHz
5. SNR = 20 x log (714 mV/RMS Noise)
6. 100% of Tested ICs fit the bandwidth and attenuation tolerance at 25°C.
7. Guaranteed by Characterization.
70 ns
20 ns
http://onsemi.com
5
5 Page 
NCS2566
APPLICATIONS INFORMATION
The NCS2566 6−channel video filter driver has been
optimized for Standard and High Definition video
applications covering the requirements of the standards
Composite video (CVBS), S−Video, Component Video
(480i/525i, 576i/625i, 720p/1080i) and related (RGB). The
first 3−channels (SD1, SD2, SD3) are dedicated for
www.dataSsthaenedta4rud.cDomefinition, CVBS and S−Video applications for
which the frequency bandwidth required does not exceed 8
MHz. The 3 other channels (SD/HD1, SD/HD2, SD/HD3)
have selectable filters (8 MHz and 34 MHz) for covering
either standard−definition−like video applications or High
Definition video applications. These frequencies are
selectable using the pin SD/HD. If the application requires,
the video driver outputs may also be disabled using the
SD EN or SD/HD EN required by the application the pins
SD EN or SD/HD EN.
In the regular mode of operation each channel provides an
internal voltage−to−voltage gain of 2 from input to output.
This effectively reduces the number of external components
required as compared to discrete approaches implemented
with stand−alone op amps. An internal level shifter is
employed shifting up the output voltage by adding an offset
of 200 mV. This prevents sync pulse clipping and allows
DC−coupled output to the 150 W video load. In addition the
NCS2566 integrates a 6th−order Butterworth filter for each
channel. This allows rejection of aliases or unwanted
over−sampling effects produced by the video DAC.
Similary for DVD recorders which uses an ADC, this
anti−aliasing filter (reconstruction filter) will avoid picture
quality issues and will aide filtration of parasitic signals
caused by EMI interference.
A built−in diode−like clamp is used in the chip for each
channel to support the AC−coupled mode of operation. The
clamp is active when the input signal goes below 0 V.
The built−in clamp and level shifter allow the device to
operate in different configuration modes depending on the
DAC output signal level and the input common mode
voltage of the video driver. When the configuration is
DC−Coupled at the Inputs and Outputs the 0.1 mF and
220 mF coupling capacitors are no longer used and the
clamps are in that case inactive; this configuration provides
a low cost solution which can be implemented with few
external components.
The input is AC−coupled when either the input−signal
amplitude goes over the range 0 V to 1.4 V or if the video
source requires such a coupling. In some circumstances it
may be necessary to auto−bias signals with the addition of
a pull−up and pull−down resistors or only pull−up resistor
(Typical 7.5 MW combined with the internal 800 kW
pulldown) making the clamp inactive.
The output AC−coupling configuration is advantageous
for eliminating DC ground loop, but may have the drawback
of increasing sensitivity to video line or field tilt issues if the
output coupling capacitor is too small. DC ground loop with
the drawback of making the device more sensitive to video
line or field tilt issues in the case of a too low output coupling
capacitor. In some cases it may be necessary to increase the
nominal 220 mF capacitor value.
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11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCS2566.PDF ] | |
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