4-Channel Video Driver with SD Reconstruction Filters

NCS2554
Four-Channel Video Driver
with SD Reconstruction
Filters
The NCS2554 is a 4−channel high speed video driver with 6th order
Butterworth Reconstruction filters on each channel. A first set of
3−channel has Standard Definition (SD) filters, one per channel. A
fourth channel offers an extra filter driver for driving Cvbs−type video
signal. The NCS2554 is in fact a combination of a triple SD video
driver for YPbPr plus a single Cvbs video driver.
It is designed to be compatible with Digital−to−Analog Converters
(DAC) embedded in most video processors.
To further reduce power consumption, 2 enable pins are provided
one for the triple driver and another one for the single driver. All
channels can accept DC− or AC−coupled signals. In case of
AC−coupled inputs, the internal clamps are enabled. The outputs can
drive both AC and DC coupled 150 W loads.
Features
• 4−Channel with per Channel a Selectable Sixth−Order Butterworth
•
•
•
•
•
•
•
•
•
•
•
8 MHz Filter
Transparent Clamp
Internal Fixed Gain: 6 dB $0.2
Integrated Level Shifter
AC− or DC−Coupled Inputs and Outputs
Low Quiescent Current
Shutdown Current 42 mA Typical (Disabled)
Each channel Capable to Drive 2 by 150 W Loads
Wide Operating Supply Voltage Range: +4.7 V to +5.3 V
Robust ESD protection 8 kV
TSSOP−14 Package
This is a Pb−Free Device
14
14
1
TSSOP−14
TBD SUFFIX
CASE 948G
1
NCS
2554
ALYWG
G
NCS2554 = Specific Device Code
A
= Assembly Location
L
= Wafer Lot
Y
= Year
W
= Work Week
G
= Pb−Free Package
CVBS_IN
1
14
CVBS_OUT
CVBS_EN
2
13
GND
VCC
3
12
GND
NC
4
11
SD_EN
SD_IN1
5
10
SD_OUT1
SD_IN2
6
9
SD_OUT2
SD_IN3
7
8
SD_OUT3
(Top View)
ORDERING INFORMATION
Device
• Set Top Box Decoder
• DVD Player / Recorder
• SDTV
January, 2010 − Rev. 1
MARKING
DIAGRAM
PINOUT
Typical Application
© Semiconductor Components Industries, LLC, 2010
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NCS2554DTBR2G
Package
Shipping†
TSSOP−14
(Pb−Free)
2500 /
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
1
Publication Order Number:
NCS2554/D
NCS2554
CVBS_IN
1
6dB
Transparent Clamp
14
CVBS_OUT
13
GND
12
GND
11
SD_EN
6dB
10
SD_OUT1
6dB
9
SD_OUT2
6dB
8
SD_OUT3
6th Order, 8 MHz Filter
CVBS_EN
2
250 kW
GND
VCC
3
NC
4
SD_IN1
5
250 kW
Transparent Clamp
6th Order, 8 MHz Filter
SD_IN2
6
Transparent Clamp
6th Order, 8 MHz Filter
SD_IN3
7
Transparent Clamp
6th Order, 8 MHz Filter
Figure 1. NCS2554 Block Diagram
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2
NCS2554
PIN DESCRIPTION
Pin No.
Name
Type
1
CVBS_IN
Input
Video Input for Video Signal featuring a frequency bandwidth compatible with NTSC /
PAL / SECAM Video (8 MHz) − Cvbs Channel
Description
2
CVBS_EN
Input
Cvbs Channel Enable /Disable Function: Low = Enable, High = Disable. When left open
the default state is Enable.
3
VCC
Power
4
NC
Input
Not Connected
5
SD_IN1
Input
Selectable SD Video Input 1 − SD Channel 1
6
SD_IN2
Input
Selectable SD Video Input 2 − SD Channel 2
7
SD_IN3
Input
Selectable SD Video Input 3 − SD Channel 3
8
SD_OUT3
Output
SD Video Output 3 − SD Channel 3
9
SD_OUT2
Output
SD Video Output 2 − SD Channel 2
10
SD_OUT1
Output
SD Video Output 1 − SD Channel 1
11
SD_EN
Input
12
GND
Ground
Ground
13
GND
Ground
Ground
14
CVBS_OUT
Output
Cvbs Video Output – Cvbs Channel
Power Supply / 4.7 V to 5.3 V
SD Channel Enable/Disable Function: Low = Enable, High = Disable. When left open the
default state is Enable.
ATTRIBUTES
Characteristic
Value
Moisture Sensitivity (Note 1)
Flammability Rating
Level 1
Oxygen Index: 28 to 34
1. For additional information, see Application Note AND8003/D
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3
UL 94 V−0 @ 0.125 in.
NCS2554
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
VCC
−0.3 v VCC v 5.5
Vdc
Input Voltage Range
VI
−0.3 v VI v VCC
Vdc
Input Differential Voltage Range
VID
−0.3 v VI v VCC
Vdc
Power Supply Voltages
Output Current (Indefinitely) per Channel
IO
40
mA
Maximum Junction Temperature (Note 2)
TJ
150
°C
Operating Ambient Temperature
TA
−40 to +85
°C
Storage Temperature Range
Tstg
−60 to +150
°C
Thermal Resistance, Junction−to−Air
RqJA
125
°C/W
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
2. Power dissipation must be considered to ensure maximum junction temperature (TJ) is not exceeded.
1800
The maximum power that can be safely dissipated is
limited by the associated rise in junction temperature. For
the plastic packages, the maximum safe junction
temperature is 150°C. If the maximum is exceeded
momentarily, proper circuit operation will be restored as
soon as the die temperature is reduced. Leaving the device
in the “overheated” condition for an extended period can
result in device burnout. To ensure proper operation, it is
important to observe the derating curves.
1600
POWER DISSIPATION (mV)
Maximum Power Dissipation
1400
1200
1000
800
600
400
200
0
−40 −30−20−10
0 10 20 30 40 50 60 70 80 90100
TEMPERATURE (°C)
Figure 2. Power Dissipation vs Temperature
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NCS2554
DC ELECTRICAL CHARACTERISTICS (VCC = +5.0 V, 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)
Symbol
Characteristics
Conditions
Min
Typ
Max
Unit
4.7
5.0
5.3
V
40
55
mA
42
60
mA
GND
1.4
VPP
POWER SUPPLY
VCC
Supply Voltage Range
ICC
Supply Current
ISD
Shutdown Current (CVBS_EN and SD_EN High)
SD Channels Selected + Cvbs
DC PERFORMANCE
Vi
Input Common Mode Voltage Range
VIL
Input Low Level for the Control Pins (2, 11)
0
0.8
V
VIH
Input High Level for the Control Pins (2, 11)
2.4
VCC
V
Rpd
Pulldown Resistors on Pins CVBS_EN and SD_EN
250
kW
OUTPUT CHARACTERISTICS
VOH
Output Voltage High Level
2.8
V
VOL
Output Voltage Low Level
200
mV
IO
Output Current
40
mA
AC ELECTRICAL CHARACTERISTICS FOR STANDARD DEFINITION CHANNELS (pin numbers (1, 14) (5, 10), (6, 9), (7,
8)) (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)
Symbol
Characteristics
Conditions
Vin = 1 V − All SD Channels
Min
Typ
Max
5.8
6.0
6.2
Unit
AVSD
Voltage Gain
BWSD
Low Pass Filter Bandwidth (Note 4)
ARSD
Stop−band Attenuation (Notes 4 and 5)
dGSD
Differential Gain Error
dFSD
Differential Phase Error
0.7
°
THD
Total Harmonic Distortion
Vout = 1.4 VPP @ 3.58 MHz
0.35
%
XSD
Channel−to−Channel Crosstalk
@ 1 MHz and Vin = 1.4 VPP
−57
dB
SNRSD
Signal−to−Noise Ratio
NTC−7 Test Signal, 100 kHz
to 4.2 MHz (Note 3)
72
dB
DtSD
Propagation Delay
@ 4.5 MHz
70
ns
DGDSD
Group Delay Variation
100 kHz to 8 MHz
20
ns
−1 dB
−3 dB
5.5
6.5
7.2
8.0
@ 27 MHz
43
50
dB
0.7
%
3. SNR = 20 x log (714 mV / RMS noise)
4. 100% of Tested ICs fit the bandwidth and attenuation tolerance at 25°C.
5. Guaranteed by characterization.
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5
dB
MHz
NCS2554
TYPICAL CHARACTERISTICS
30
0.4
20
0.35
10
0.3
NORMALIZED GAIN (dB)
NORMALIZED GAIN (dB)
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
0
−10
−20
−30
−1 dB @ 6.7 MHz
−3 dB @ 8.1 MHz
−53 dB @ 27 MHz
−40
−50
1M
10M
0.2
0.15
0.1
0.5
0
−0.1
100k
100M
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 3. SD Normalized Frequency Response
Figure 4. SD Passband Flatness
−40
30
−45
20
−51.8 dB @ 6.85 MHz
−50
GROUP DELAY (ns)
10
−55
GAIN (dB)
0.25
−0.5
−60
−70
100k
0.226 dB @ 3.6 MHz
−60
−65
−70
−79 dB @ 50 kHz
−75
−80
0
−10
−20
20.7 ns @ 7 MHz
−30
−40
−50
−60
−85
−90
20k
100k
1M
−70
400k
10M
1M
10M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 5. SD Channel−to−Channel Crosstalk
Figure 6. SD Normalized Group Delay
Output
Input
Output
70 ns
200 mV
Input
0.7 VPP
Figure 7. SD Propagation Delay
Figure 8. SD Small Signal Response
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6
20M
NCS2554
TYPICAL CHARACTERISTICS
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
0
−10
Output
Input
−20
PSRR (dB)
−30
−40
−50
−60
−70
1 VPP
−80
−90
−100
20
1M
FREQUENCY (Hz)
50M
Figure 10. SD VCC PSRR vs. Frequency
20
60
10
50
0
40
−10
30
−20
20
−30
10
−40
0
−50
−10
−60
−20
−70
−30
−80
400k
10M
1M
(Hz)
NORMALIZED GROUP DELAY (ns)
NORMALIZED GAIN (dB)
Figure 9. SD Large Signal Response
100k
−40
50M
10M
Figure 11. SD Frequency Response and Group
Delay
0.9
0.9
0.75
0.76
0.68
0.7
0.6
0.5
0..4
0.31
0.3
0.8
DIFFERENTIAL PHASE (°)
DIFFERENTIAL GAIN (%)
0.8
0.77
0.2
0.1
0
0.75
0.7
0.65
0.6
0.5
0..4
0.36
0.3
0.2
0.14
0.07
0.1
0
1
2
3
4
5
0
6
1
2
3
4
5
HARMONIC
HARMONIC
Figure 12. SD Differential Gain
Figure 13. SD Differential Phase
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6
NCS2554
APPLICATIONS INFORMATION
employed shifting up the output voltage by adding an offset
The NCS2554 quad video driver has been optimized for
of 200 mV. This prevents sync pulse clipping and allows
Standard video applications covering the requirements of
the standards Composite video (Cvbs), S−Video,
DC−coupled output to the 150 W video load. In addition, the
Component Video (480i/525i, 576i/625i) and related
NCS2554 integrates a 6th order Butterworth filter for each.
(RGB). The three SD channels have 8 MHz filters for
This allows rejection of the aliases or unwanted
covering standard definition−like video applications.
over-sampling effects produced by the video DAC.
In the regular mode of operation each channel provides an
Similarly for the case of DVD recorders which use an ADC,
internal voltage−to−voltage gain of 2 from input to output.
this anti−aliasing filter (reconstruction filter) will avoid
This effectively reduces the number of external components
picture quality issue and will aide filtration of parasitic
required as compared to discrete approached implemented
signals caused by EMI interference.
with stand alone op amps. An internal level shifter is
+5V
10 mF
0.1 mF
1
Rs
2
CVBS EN
Video Processor
3
4
0.1 mF
Y/G
Pb / B
Pr / R
Rs
Rs
Rs
0.1 mF
0.1 mF
5
6
7
CVBS_IN
CVBS_OUT
CVBS_EN
GND
VCC
GND
NC
SD_IN1
SD_IN2
SD_IN3
14
75 W
220 mF
75 W Cable
75 W
CVBS
13
12
NCS2554
0.1 mF
CVBS
SD_EN
11
SD_OUT1 10
SD_OUT2
SD_OUT3
9
8
75 W
220 mF
75 W Cable
75 W
220 mF
75 W Cable
75 W
75 W
220 mF
75 W Cable
75 W
TV
Y/G
Pb / B
Pr / R
75 W
SD_EN
Figure 14. AC−Coupled Configuration at the Input and Output
some cases it may be necessary to increase the nominal
220 mF capacitor value.
A built−in diode−like clamp is used into 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 (Figure 15).
The input is AC−coupled when either the input−signal
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.
The output AC−coupling configuration is advantageous
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
Shutdown Mode
If the enable pins are left open by default the circuit will
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
The outputs of the NCS2554 can be DC−coupled to a
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.
The problems of field tilt effects on the video signal are
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.
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8
NCS2554
+5V
10 mF
0.1 mF
1
Rs
2
CVBS EN
Video Processor
3
4
Y/G
Pb / B
Pr / R
5
Rs
6
Rs
7
Rs
CVBS_IN
CVBS_OUT
CVBS_EN
GND
VCC
GND
NCS2554
CVBS
NC
SD_EN
14
SD_OUT2
SD_IN2
SD_OUT3
SD_IN3
75 W
CVBS
13
12
11
SD_OUT1 10
SD_IN1
75 W Cable
75 W
9
8
75 W
75 W Cable
75 W
75 W Cable
75 W
75 W
75 W Cable
75 W
TV
Y/G
Pb / B
Pr / R
75 W
SD_EN
Figure 15. DC−Coupled Input and Output Configuration
+5V
10 mF
75 W
220 mF
75 W Cable
Other Display
0.1 mF
1
Rs
2
CVBS EN
Video Processor
3
4
Y/G
Pb / B
Pr / R
Rs
5
6
Rs
Rs
7
CVBS_IN
CVBS_OUT
CVBS_EN
VCC
NC
SD_IN1
SD_IN2
SD_IN3
GND
CVBS2
14
13
75 W
220 mF
75 W Cable
75 W
CVBS1
12
NCS2554
CVBS
75 W
GND
SD_EN
11
SD_OUT1 10
SD_OUT2
SD_OUT3
9
8
75 W
220 mF
75 W Cable
75 W
220 mF
75 W Cable
75 W
220 mF
75 W Cable
75 W
TV
Y/G
Pb / B
75 W
Pr / R
75 W
SD_EN
Figure 16. Typical Application
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NCS2554
+5V
10 mF
75 W
CVBS
1
Rs
2
CVBS EN
Video Processor
3
4
0.1 mF
Y/G
Pb / B
Pr / R
Rs
Rs
Rs
0.1 mF
0.1 mF
75 W
75 W Cable
CVBS1
0.1 mF
5
6
7
CVBS_IN
CVBS_OUT
CVBS_EN
GND
VCC
GND
14
75 W
13
220 mF
75 W
75 W Cable
CVBS2
12
NC
NCS2554
0.1 mF
220 mF
SD_EN
11
SD_IN1
SD_OUT1 10
SD_IN2
SD_OUT2
SD_IN3
SD_OUT3
75 W 220 mF
75 W 220 mF
9
75 W 220 mF
8
75 W Cable
75 W Cable
75 W Cable
Y / G1
TV
75 W
Pb / B1
75 W
Pr / R1
75 W
SD_EN
75 W
75 W
75 W
220 mF
220 mF
220 mF
75 W Cable
75 W Cable
75 W Cable
Y / G2
TV
75 W
Pb / B2
75 W
Pr / R2
75 W
Figure 17. NCS2554 Driving 2 SCARTS Simultaneously
Video Driving Capability
with a particular attention with ESD structure able to sustain
a typical value of 8 kV. This parameter is particularly
important for video drivers which usually constitute the last
stage in the video chain before the video output connector.
The test method used follow the IEC61000−4−2
methodology. More details can be provided if requested.
With an output current capability of 40 mA the NCS2554
was designed to be able to drive at least 2 video display loads
in parallel. This type of application is illustrated Figure 16.
Figure 18 (multiburst) and Figure 19 (linearity) show that
the video signal can efficiently drive a 75 W equivalent load
and not degrade the video performance.
ESD Protection
All the device pins are protected against electrostatic
discharge at a level of 8 kV. This feature has been considered
Figure 18. Multiburst Test with Two 150 Loads
Figure 19. Linearity Test with Two 150 Loads
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10
NCS2554
PACKAGE DIMENSIONS
TSSOP−14
CASE 948G−01
ISSUE B
14X K REF
0.10 (0.004)
0.15 (0.006) T U
T U
M
V
S
S
S
N
2X
14
L/2
0.25 (0.010)
8
M
B
−U−
L
PIN 1
IDENT.
N
F
7
1
0.15 (0.006) T U
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH OR GATE BURRS SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
4. DIMENSION B DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION SHALL
NOT EXCEED 0.25 (0.010) PER SIDE.
5. DIMENSION K DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.08 (0.003) TOTAL
IN EXCESS OF THE K DIMENSION AT
MAXIMUM MATERIAL CONDITION.
6. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7. DIMENSION A AND B ARE TO BE
DETERMINED AT DATUM PLANE −W−.
S
DETAIL E
ÇÇÇ
ÇÇÇ
ÉÉÉ
ÇÇÇ
ÉÉÉ
K
A
−V−
K1
J J1
DIM
A
B
C
D
F
G
H
J
J1
K
K1
L
M
SECTION N−N
−W−
C
0.10 (0.004)
−T− SEATING
PLANE
D
H
G
DETAIL E
MILLIMETERS
INCHES
MIN
MAX
MIN MAX
4.90
5.10 0.193 0.200
4.30
4.50 0.169 0.177
−−−
1.20
−−− 0.047
0.05
0.15 0.002 0.006
0.50
0.75 0.020 0.030
0.65 BSC
0.026 BSC
0.50
0.60 0.020 0.024
0.09
0.20 0.004 0.008
0.09
0.16 0.004 0.006
0.19
0.30 0.007 0.012
0.19
0.25 0.007 0.010
6.40 BSC
0.252 BSC
0_
8_
0_
8_
SOLDERING FOOTPRINT*
7.06
1
0.65
PITCH
14X
0.36
14X
1.26
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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NCS2554/D
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