NCS2554DTBR2G ON Semiconductor, NCS2554DTBR2G Datasheet - Page 8

• Manufacturer Part Number: NCS2554DTBR2G
• Description: IC AMP SD VIDEO 4CH 14TSSOP
• Manufacturer: ON Semiconductor

Specifications of NCS2554DTBR2G

• Applications: Reconstruction Filter
• Number Of Circuits: 4
• -3db Bandwidth: 8MHz
• Current - Supply: 40mA
• Current - Output / Channel: 40mA
• Voltage - Supply, Single/dual (±): 4.7 V ~ 5.3 V
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Standard video applications covering the requirements of
the standards Composite video (Cvbs), S−Video,
Component Video (480i/525i, 576i/625i) and related
(RGB). The three SD channels have 8 MHz filters for
covering standard definition−like video applications.
internal voltage−to−voltage gain of 2 from input to output.
This effectively reduces the number of external components
required as compared to discrete approached implemented
with stand alone op amps. An internal level shifter is
channel to support the AC−coupled mode of operation. The
clamp is active when the input signal goes below 0 V.
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 (Figure 15).
amplitude goes over the range 0 V to 1.4 V or the video
source requires such a coupling. In some circumstances it
may be necessary to auto−bias signals with the addition of
a pullup and pulldown resistors or only pullup resistor
(Typical 7.5 MW combined with the internal 800 kW
pulldown) making the clamp inactive.
for eliminating 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
The NCS2554 quad video driver has been optimized for
In the regular mode of operation each channel provides an
A built−in diode−like clamp is used into the chip for each
The built−in clamp and level shifter allow the device to
The input is AC−coupled when either the input−signal
The output AC−coupling configuration is advantageous
CVBS EN
SD_EN
CVBS
Pb / B
Pr / R
Y / G
Rs
Rs
Rs
Rs
Figure 14. AC−Coupled Configuration at the Input and Output
0.1 mF
0.1 mF
0.1 mF
0.1 mF
+ 5 V
10 mF
0.1 mF
1
2
3
4
5
6
7
APPLICATIONS INFORMATION
CVBS_IN
CVBS_EN
VCC
NC
SD_IN1
SD_IN2
SD_IN3
http://onsemi.com
CVBS_OUT
SD_OUT1
SD_OUT2
SD_OUT3
SD_EN
GND
GND
8
10
8
13
9
12
11
14
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
NCS2554 integrates a 6
This allows rejection of the aliases or unwanted
over-sampling effects produced by the video DAC.
Similarly for the case of DVD recorders which use an ADC,
this anti−aliasing filter (reconstruction filter) will avoid
picture quality issue and will aide filtration of parasitic
signals caused by EMI interference.
some cases it may be necessary to increase the nominal
220 mF capacitor value.
Shutdown Mode
be enabled. The Enable pin offers a shutdown function, so
the NCS2554 can consequently be disabled when not used.
The NCS2554’s quiescent current reduces to 42 mA typical
during shutdown mode.
DC−Coupled Output
150 W load (Figure 15). This has the advantage of
eliminating the AC−coupling capacitors at the output by
reducing the number of external components and saving
space on the board. This can be a key advantage for some
applications with limited space.
also eliminated providing the best video quality with
optimal dynamic or peak−to−peak amplitude of the video
signal allowing operating thanks to the built−in level shifter
without risk of signal clipping. In this coupling
configuration the average output voltage is higher than 0 V
and the power consumption can be a little higher than with
an AC−coupled configuration.
If the enable pins are left open by default the circuit will
The outputs of the NCS2554 can be DC−coupled to a
The problems of field tilt effects on the video signal are
75 W
75 W
75 W
75 W
220 mF
220 mF
220 mF
220 mF
75 W Cable
75 W Cable
75 W Cable
75 W Cable
th
order Butterworth filter for each.
TV
75 W
75 W
75 W
75 W
CVBS
Y / G
Pb / B
Pr / R